A circuit protection device, a battery pack, and an electric device

Abstract

The application relates to the technical field of batteries, in particular to a circuit protection device, a battery pack and a power utilization device. The circuit protection device comprises a first circuit breaker and a current detection unit, the first circuit breaker comprises a wiring terminal, the first circuit breaker is configured to turn on or turn off a circuit; the current detection unit is connected with the wiring terminal, and the current detection unit is configured to detect a current flowing through the wiring terminal. The circuit protection device integrates the first circuit breaker and the current detection unit, and has the functions of the first circuit breaker and the current detection unit. Compared with separately arranging the first circuit breaker and the current detection unit, the circuit protection device can reduce the number of parts, save material cost, and the integrated first circuit breaker and current detection unit have a relatively small overall volume, can save installation space, and are convenient to install.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a circuit protection device, a battery pack and a power utilization device. BACKGROUND

[0002] In the conventional technology, two relays (a main positive relay and a main negative relay), a pre-charge branch (the pre-charge branch includes a pre-charge relay and a pre-charge resistor), an insurance, and a shunt for current sampling of the high-voltage loop are required in the battery pack. The large number of components in the battery pack leads to a large size of the battery pack. SUMMARY

[0003] Embodiments of the present application provide a circuit protection device, a battery pack and a power utilization device to solve the technical problem of the large size of the battery pack caused by the large number of components in the battery pack in the prior art.

[0004] In a first aspect, embodiments of the present application provide a circuit protection device, which comprises:

[0005] A first circuit breaker comprising a terminal, the first circuit breaker being configured to turn on or turn off a circuit;

[0006] A current detection unit connected to the terminal, the current detection unit being configured to detect a current flowing through the terminal.

[0007] In some embodiments, the current detection unit comprises a shunt.

[0008] In some embodiments, the terminal comprises a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being arranged at intervals in a flow direction of the current;

[0009] The shunt comprises a resistor, the resistor being arranged between the first connecting portion and the second connecting portion, a first end of the resistor being connected to the first connecting portion, and a second end of the resistor being connected to the second connecting portion.

[0010] In some embodiments, the shunt further comprises a first circuit board, the first circuit board being electrically connected to the terminal, the first circuit board being configured to output current information detected by the terminal.

[0011] In some embodiments, the first circuit board comprises,

[0012] A first sampling pin connected to the first end of the resistor, and / or connected to the first connecting portion near the end portion of the resistor;

[0013] A second sampling pin is connected to the second end of the resistor and / or connected to the second connecting part near the end of the resistor.

[0014] In some embodiments, the first circuit board is provided with a first connecting position and a second connecting position, the first connecting position is connected to the resistor, the first connecting part and the first sampling pin, and the second connecting position is connected to the resistor, the second connecting part and the second sampling pin.

[0015] In some embodiments, the circuit protection device comprises a pin for signal output and / or input of the circuit protection device, and the first circuit board is electrically connected to the pin.

[0016] In some embodiments, the first circuit breaker comprises a second circuit board, and the first circuit board and the second circuit board are electrically connected.

[0017] In some embodiments, the circuit protection device comprises a pin for signal output and / or input of the circuit protection device, and the second circuit board is connected to the pin.

[0018] In some embodiments, the first circuit breaker is a double-circuit breaker, the wiring terminal comprises a first wiring terminal, a second wiring terminal, a third wiring terminal and a fourth wiring terminal, and the shunt is connected to at least one of the first wiring terminal, the second wiring terminal, the third wiring terminal and the fourth wiring terminal.

[0019] In some embodiments, the first circuit breaker is a single-circuit breaker, the wiring terminal comprises a first wiring terminal and a second wiring terminal, and the shunt is connected to at least one of the first wiring terminal and the second wiring terminal.

[0020] In some embodiments, the wiring terminal is a copper bar.

[0021] In some embodiments, the circuit protection device further comprises a housing, the first circuit breaker and the current detection unit are arranged in the housing, and at least part of the wiring terminal extends out of the housing.

[0022] In some embodiments, the first circuit breaker is a restorable circuit breaker.

[0023] In the second aspect, the embodiments of the present application also provide a battery pack comprising the circuit protection device as described above.

[0024] In some embodiments, the battery pack further comprises a battery module, the battery module is provided with an input end and an output end, the first circuit breaker of the circuit protection device comprises,

[0025] a first terminal connected with the input end, and a second terminal configured to be connected with a first end of the load;

[0026] a third terminal connected with the output end, and a fourth terminal configured to be connected with a second end of the load.

[0027] In some embodiments, the battery pack further comprises a battery module provided with an input end and an output end; the first circuit breaker of the circuit protection device comprises a first terminal and a second terminal,

[0028] the first terminal is connected with the input end, and the second terminal is configured to be connected with a first end of the load; or, the first terminal is connected with the output end, and the second terminal is configured to be connected with a second end of the load.

[0029] In some embodiments, the battery pack further comprises a second circuit breaker;

[0030] the circuit protection device is electrically connected between one of the input end and the output end and the load, and the second circuit breaker is electrically connected between the other of the input end and the output end and the load.

[0031] In a third aspect, the embodiments of the present application further provide a power utilization device, which comprises the battery pack as described above.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] In the embodiments of the present application, the circuit protection device comprises a first circuit breaker and a current detection unit, the current detection unit is connected with the terminal to detect the current flowing through the terminal, so as to realize the sampling of the loop current of the circuit protection device. The circuit protection device integrates the first circuit breaker and the current detection unit, and has the functions of the first circuit breaker and the current detection unit. Compared with separately arranging the first circuit breaker and the current detection unit, the circuit protection device can reduce the number of parts, save material cost, and the integrated circuit protection device has a relatively small overall volume, which can save installation space and facilitate installation.

[0034] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments description will be briefly introduced.

[0036] Figure 1 Fig. 1 is a structural schematic diagram of a circuit protection device in an embodiment of the present application;

[0037] Figure 2 Fig. 2 is a partial structural schematic diagram of an exploded view of the circuit protection device in the embodiment of the present application;

[0038] Figure 3 Fig. 3 is a structural schematic diagram of a connection between a shunt and a first circuit breaker in the embodiment of the present application;

[0039] Figure 4 Fig. 4 is a position schematic diagram of the connection between the shunt and the first circuit breaker in the embodiment of the present application;

[0040] Figure 5 Fig. 5 is a simplified electrical principle schematic diagram of a battery pack and a vehicle in the embodiment of the present application; Figure 1

[0041] Figure 6 Fig. 6 is a simplified electrical principle schematic diagram of a battery pack and a vehicle in the embodiment of the present application; Figure 2

[0042] Figure 7 Fig. 7 is a communication connection schematic diagram of the circuit protection device in the embodiment of the present application.

[0043] Reference signs:

[0044] 1, first circuit breaker; 11, terminal; 111, first connecting part; 112, second connecting part; 113, first terminal; 114, second terminal; 115, third terminal; 116, fourth terminal; 12, second circuit board;

[0045] 2, shunt; 21, resistance; 22, first circuit board; 23, connecting part; 24, first sampling pin; 25, second sampling pin; 26, first connecting position; 27, second connecting position;

[0046] 3, pin; 4, shell; 41, first shell; 42, second shell; 43, support; 431, first mounting plate; 432, connecting rod; 433, second mounting plate;

[0047] 5, battery module; 51, input end; 52, output end;

[0048] ​​6, load; 61, capacitor; 62, DC-DC converter; 63, power supply; 64, safety controller; 65, battery management unit; 66, connector; 7, circuit protection device; 8, second circuit breaker; 9, fuse; 10, current detection unit. DETAILED DESCRIPTION

[0049] Exemplary embodiments of the present application will be described in detail with reference to the drawings. Although exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0050] Reference Signs List Figures 1 to 4 As shown in the drawings, the embodiments of the present application provide a circuit protection device 7, which includes a first circuit breaker 1 and a current detection unit 10 and has the functions of the first circuit breaker 1 and the current detection unit 10. Integrating the first circuit breaker 1 and the current detection unit 10 in the circuit protection device 7 can reduce the number of parts and save installation space.

[0051] The circuit protection device 7, the battery pack, and the electrical device provided by the embodiments of the present application will be described in detail below with reference to the drawings, specific embodiments, and application scenarios.

[0052] In some embodiments, a circuit protection device 7 is provided, which includes a first circuit breaker 1 having a terminal 11 and configured to turn on or turn off a circuit, and a current detection unit 10 connected to the terminal 11 and configured to detect a current flowing through the terminal 11.

[0053] The first circuit breaker 1 is a switching device capable of closing, carrying, and breaking normal and abnormal currents, used for circuit protection (overload, short circuit, undervoltage, etc.) and power distribution. The first circuit breaker 1 is a recoverable circuit breaker, i.e., the first circuit breaker 1 can be closed again after breaking. Thus, the first circuit breaker 1 can be used again without replacing parts after breaking, and has the advantages of flexibility and safety in operation.

[0054] The current detection unit 10 is a device that can detect a current. In the embodiments of the present application, the current detection unit 10 is used for sampling the loop current of the circuit protection device 7.

[0055] The circuit protection device 7 of the embodiment of the present application, the first circuit breaker 1 is electrically connected with an external structure through the wiring terminal 11, the external structure is, for example, the battery module 5, and is, for example, the load 6, the circuit protection device 7 can be connected in the circuit connected between the battery module 5 and the load 6, and is set and installed according to the use demand. The current detection unit 10 is connected with the wiring terminal 11 to detect the current flowing through the wiring terminal 11, and the current flowing through the circuit protection device 7 is sampled. The circuit protection device 7 integrates the first circuit breaker 1 and the current detection unit 10, and has the functions of the first circuit breaker 1 and the current detection unit 10. Compared with separately arranging the first circuit breaker 1 and the current detection unit 10, the circuit protection device 7 can reduce the number of parts, save material cost, and the overall volume of the circuit protection device 7 is relatively small after integrating the first circuit breaker 1 and the current detection unit 10, which can save installation space and facilitate installation.

[0056] In some embodiments, the circuit protection device 7 is used, the load 6 is an electrical component on the vehicle, and / or the load 6 is a charger or a charging pile, etc., according to the use demand setting.

[0057] In some embodiments, the current detection unit 10 includes a shunt 2. The shunt 2 is an instrument for measuring direct current. In the embodiment of the present application, the shunt 2 is used for sampling the loop current connected by the circuit protection device 7.

[0058] In other embodiments, the current detection unit 10 includes a Hall sensor connected with the wiring terminal 11, so that the loop current connected by the circuit protection device 7 can also be sampled. The connection structure of the Hall sensor and the wiring terminal 11 can refer to various conventional ways, for example, the wiring terminal 11 passes through the hole diameter on the Hall sensor.

[0059] In some embodiments, the wiring terminal 11 includes a first connecting part 111 and a second connecting part 112, and the first connecting part 111 and the second connecting part 112 are arranged at intervals in the flow direction of the current; the shunt 2 includes a resistance piece 21, and the resistance piece 21 is arranged between the first connecting part 111 and the second connecting part 112, the first end of the resistance piece 21 is connected with the first connecting part 111, and the second end of the resistance piece 21 is connected with the second connecting part 112.

[0060] In the embodiment of the present application, the shunt 2 is made according to the principle that a voltage is generated across the resistance piece 21 when the direct current passes through the resistance piece 21, therefore, the first connecting part 111 and the second connecting part 112 are connected through the resistance piece 21, the current flowing through the wiring terminal 11 will flow through the resistance piece 21, and the shunt 2 can achieve the purpose of detecting the current flowing through the wiring terminal 11; and the overall volume of the integrated first circuit breaker 1 and shunt 2 is relatively small, which can save installation space.

[0061] It can be understood that the flowing direction of the current is related to the wiring mode of the circuit protection device 7, and thus the flowing direction of the current is in the direction of arrow A or in the opposite direction of arrow A. Figure 3

[0062] In some embodiments, the resistor 21 is a piece of alloy material, and the embodiments of the present application do not specifically limit the material of the resistor 21. For example, the resistor 21 is a manganese copper alloy, which has a preset resistance value (for example, 50 ohms, 25 ohms, etc.), and the current value can be calculated by dividing the voltage difference between the first end and the second end of the resistor 21 by the preset resistance value.

[0063] The resistor 21 and the first connecting part 111 and the second connecting part 112 can be connected according to the use requirements, for example, in some embodiments, the resistor 21 is welded with the first connecting part 111 and the second connecting part 112 respectively.

[0064] In some embodiments, the wiring terminal 11 is a high-voltage copper bar, which is used for electrical connection with an external structure.

[0065] In some embodiments, the shunt 2 further includes a first circuit board 22, which is electrically connected with the wiring terminal 11, and the first circuit board 22 is configured to output the detected current information flowing through the wiring terminal 11.

[0066] In the embodiments of the present application, the first circuit board 22 can be used as comprehensive control of the shunt 2, so that the shunt 2 has the functions of current detection and output. Thus, the circuit protection device 7 integrates the first circuit breaker 1 and the current detection unit 10, and the circuit protection device 7 has the functions of the first circuit breaker 1 and the current detection unit 10.

[0067] In some embodiments, the first circuit board 22 includes a first sampling pin 24 and a second sampling pin 25, which are used to collect the voltage on both sides of the resistor 21, and the first circuit board 22 can calculate the current flowing through the resistor 21 according to the collected voltage and the preset resistance value of the resistor 21.

[0068] ​The connection mode of the first sampling pin 24 and the second sampling pin 25 can be various, for example, the first sampling pin 24 is connected with the first end of the resistor 21, for example, the first sampling pin 24 is connected with the end of the first connecting part 111 close to the resistor 21, for example, the first sampling pin 24 is connected between the resistor 21 and the first connecting part 111, that is, connected with the resistor 21 and the first connecting part 111 respectively. For example, the second sampling pin 25 is connected with the second end of the resistor 21, for example, the second sampling pin 25 is connected with the end of the second connecting part 112 close to the resistor 21, for example, the second sampling pin 25 is connected between the resistor 21 and the second connecting part 112, that is, connected with the resistor 21 and the second connecting part 112 respectively, which can be set according to the use requirement.

[0069] In the case that the first sampling pin 24 and the second sampling pin 25 are connected with the resistor 21 respectively, the first sampling pin 24 and the second sampling pin 25 can obtain the voltage across the resistor 21. In the case that the first sampling pin 24 is connected with the first connecting part 111 and the second sampling pin 25 is connected with the second connecting part 112, the current flowing through the resistor 21 can be calculated according to the voltage of the first connecting part 111 and the second connecting part 112 and the preset resistance value of the resistor 21. The above mode can obtain the current value, therefore, the connection mode of the first sampling pin 24 and the second sampling pin 25 can be set according to the use requirement.

[0070] In some embodiments, the first circuit board 22 is provided with a first connecting position 26 and a second connecting position 27, the first connecting position 26 is connected with the resistor 21, the first connecting part 111 and the first sampling pin 24, and the second connecting position 27 is connected with the resistor 21, the second connecting part 112 and the second sampling pin 25.

[0071] In the embodiments of the present application, the first connecting position 26 and the second connecting position 27 are provided, so that the first connecting position 26, the resistor 21, the first connecting part 111 and the first sampling pin 24 can be connected by one-time assembly, and the second connecting position 27, the resistor 21, the second connecting part 112 and the second sampling pin 25 can be connected by one-time assembly, so that the assembly steps can be saved; moreover, compared with the multiple connecting structures, the above connection can further save the installation space and the space occupied by the first circuit board 22 and the terminal 11 after assembly. At this time, the first sampling pin 24 is connected with the resistor 21 and the first connecting part 111 respectively, and the second sampling pin 25 is connected with the resistor 21 and the first connecting part 111 respectively.

[0072] In some embodiments, the first connecting position 26, the resistor 21, the first connecting part 111 and the first sampling pin 24 can be connected by welding, and the second connecting position 27, the resistor 21, the second connecting part 112 and the second sampling pin 25 can be connected by welding, so that the assembly is simple, that is, the first connecting position 26, the resistor 21, the first connecting part 111 and the first sampling pin 24 can be connected by welding once, and the second connecting position 27, the resistor 21, the second connecting part 112 and the second sampling pin 25 can be connected by welding once.

[0073] In some embodiments, the first circuit board 22 and the terminal 11 are respectively plate-shaped structures, and the first circuit board 22 is fixedly connected with the terminal 11, so that the space in the circuit protection device 7 can be saved, and the volume of the circuit protection device 7 can be set to be relatively small.

[0074] In some embodiments, the circuit protection device comprises the pin 3 for signal output and / or input of the circuit protection device, and the first circuit board 22 is electrically connected with the pin 3. In this way, the first circuit board 22 can realize signal output and / or input through the pin 3, and at this time, the shunt 2 can independently realize signal output and / or input.

[0075] It can be understood that the number of the pin 3 is set according to the use requirement, for example, as shown in FIG. 6, six pins 3 are arranged in the circuit protection device. Figure 2

[0076] In some embodiments, the first circuit breaker 1 comprises a second circuit board 12, and the first circuit board 22 and the second circuit board 12 are electrically connected, so that the first circuit breaker 1 and the shunt 2 can realize signal transmission, and the circuit protection device 7 can better realize the function integration of the first circuit breaker 1 and the shunt 2, and realize circuit protection.

[0077] In some embodiments, the first circuit board 22 is provided with a connecting part 23, and the connecting part 23 electrically connects the first circuit board 22 and the second circuit board 12, and the use of the connecting part 23 has the advantages of simple structure and convenient connection.

[0078] In some embodiments, the second circuit board 12 is electrically connected with all the pins 3, so that the circuit protection device 7 can realize signal output and / or input through the second circuit board 12. At this time, in the circuit protection device 7, the first circuit breaker 1 and the shunt 2 realize signal transmission, and then the second circuit board 12 in the first circuit breaker 1 realizes signal output and / or input.

[0079] ​It can be understood that in the circuit protection device, the plurality of pins 3 are provided, the first circuit board 22 is connected with part of the pins 3, and the second circuit board 12 is connected with the remaining pins 3, the shunt 2 can independently realize signal output and / or input, and the second circuit board 12 can independently realize signal output and / or input.

[0080] In some embodiments, the shunt 2 further comprises a sampling member for collecting the temperature of the resistance member 21, and the sampling member is electrically connected with the first circuit board 22. The shunt 2 collects the temperature to avoid the risk of the temperature of the resistance member 21 being too high, and the accuracy of the current monitored by the shunt 2 can be corrected by the temperature of the resistance member 21.

[0081] In some embodiments, the sampling member is a temperature sensor configured to collect temperature information of the resistance member 21. It can be understood that the sampling member is set according to the use requirement, for example, the sampling member is a thermistor or a thermocouple, or other types of temperature sensors.

[0082] In some embodiments, the first circuit breaker 1 is a double-circuit breaker, the wiring terminal 11 includes a first wiring terminal 113, a second wiring terminal 114, a third wiring terminal 115, and a fourth wiring terminal 116, and the shunt 2 is connected with at least one of the first wiring terminal 113, the second wiring terminal 114, the third wiring terminal 115, and the fourth wiring terminal 116.

[0083] In some embodiments, in the case that the first circuit breaker 1 is a double-circuit breaker, the first circuit breaker 1 includes a double switch, one of which is located between the first wiring terminal 113 and the second wiring terminal 114, controls the connection or disconnection of the first wiring terminal 113 and the second wiring terminal 114, and makes the first wiring terminal 113 and the second wiring terminal 114 have an electrically connected state and a separated state; the other is located between the third wiring terminal 115 and the fourth wiring terminal 116, controls the connection or disconnection of the third wiring terminal 115 and the fourth wiring terminal 116, and makes the third wiring terminal 115 and the fourth wiring terminal 116 have an electrically connected state and a separated state, that is, the first circuit breaker 1 integrates the switching functions of two high-voltage relays.

[0084] In the case that the first circuit breaker 1 is a double-circuit breaker, the double switch shares a coil, which can save the space of the circuit protection device 7, and can be cut off multiple times without affecting the performance, and has a good circuit protection function.

[0085] In some embodiments, the first circuit breaker 1 is a single-circuit breaker, the wiring terminal 11 includes a first wiring terminal 113 and a second wiring terminal 114, and the shunt 2 is connected with at least one of the first wiring terminal 113 and the second wiring terminal 114.

[0086] In the embodiments of the present application, the connection relationship between the shunt 2 and the first and second wiring terminals 113 and 114 can be set according to the use requirements, for example, one shunt 2 is provided, and the shunt 2 is connected with the first or second wiring terminal 113 or 114, as shown in Figure 2 which shows a structure schematic view of the shunt 2 connected with the first wiring terminal 113; or for example, two shunts 2 are provided, one shunt 2 is connected with the first wiring terminal 113, and the other shunt 2 is connected with the second wiring terminal 114.

[0087] In some embodiments, in the case of the single-circuit breaker 1, one switch is included in the first circuit breaker 1, which is located between the first and second wiring terminals 113 and 114, and controls the connection or disconnection of the first and second wiring terminals 113 and 114, so that the first and second wiring terminals 113 and 114 have an electrically connected state and a separated state.

[0088] In some embodiments, the circuit protection device further includes a housing 4, and the first circuit breaker 1 and the shunt 2 are arranged in the housing 4, and at least part of the wiring terminal 11 extends out of the housing 4.

[0089] In the embodiments of the present application, the first circuit breaker 1 and the shunt 2 are integrated in the housing 4, and the housing 4 can protect the first circuit breaker 1 and the shunt 2. Part of the wiring terminal 11 extends out of the housing 4 for electrical connection with external structures, and the remaining part of the wiring terminal 11 is located in the housing 4. The connection between the shunt 2 and the wiring terminal 11 is located in the housing 4. It can be understood that the wiring terminal 11 can extend out of the housing 4 entirely, which can be set according to the use requirements.

[0090] In some embodiments, the housing 4 includes a first housing 41 and a second housing 42, and the first and second housings 41 and 42 are connected, and a channel is formed between the first and second housings 41 and 42 for the wiring terminal 11 to pass through.

[0091] In some embodiments, as shown in Figure 2 the housing 4 further includes a support 43 for supporting and mounting the first circuit breaker 1 and the shunt 2. The support 43 includes a first mounting plate 431, a connecting rod 432 and a second mounting plate 433, and the first and second mounting plates 431 and 433 are located on both sides, and the connecting rod 432 connects the first and second mounting plates 431 and 433.

[0092] The wiring terminal 11 and the shunt 2 are located between the first and second mounting plates 431 and 433, and the second circuit board 12 is fixedly connected with the second mounting plate 433.

[0093] The circuit protection device 7 integrates the first circuit breaker 1 and the shunt 2, and has the functions of the first circuit breaker 1 and the shunt 2. Compared with the separately arranged first circuit breaker 1 and shunt 2, the integration of the first circuit breaker 1 and the shunt 2 can reduce the number of parts, save material costs, and save installation space. When the first circuit breaker 1 is a recoverable circuit breaker, the first circuit breaker 1 can be connected after being disconnected, thereby avoiding the increase in use cost caused by the need to replace the fuse or directly scrap the traditional fuse after burning out.

[0094] In some embodiments, a battery pack is provided, which includes the circuit protection device 7 as described above.

[0095] Since the circuit protection device 7 integrates the first circuit breaker 1 and the current detection unit 10, compared with the separately arranged current detection unit 10 and first circuit breaker 1 in the battery pack, only the circuit protection device 7 needs to be arranged in the battery pack to have the functions of the first circuit breaker 1 and the current detection unit 10. Thus, the battery pack including the circuit protection device 7 can reduce the number of parts, save material costs, and the circuit protection device 7 has a relatively small size, which can save installation space in the battery pack and facilitate installation.

[0096] The circuit protection device 7 has the function of a distribution box, and thus, in a battery pack with a distribution box, one circuit protection device 7 can replace the distribution box, and the battery pack does not need to be provided with many redundant components, thereby greatly saving the assembly cost and component cost of the battery pack and greatly increasing the assembly rate of the battery pack.

[0097] In use, the shunt 2 can collect current information of the wiring terminal 11 of the first circuit breaker 1, and the current information can be sent to a battery management unit (‌BMU, Battery Management Unit) to enable the battery management unit to monitor the running state of the battery pack in real time.

[0098] In some embodiments, the battery pack includes a battery module 5 provided with an input end 51 and an output end 52; and the circuit protection device 7 is electrically connected to at least one of the input end 51 and the output end 52, so as to be connected to the circuit of the battery pack, and the circuit protection device 7 can realize the functions of circuit protection and current collection.

[0099] In the embodiments of the present application, in the case that the first circuit breaker 1 in the circuit protection device 7 is a double-circuit breaker, one first circuit breaker 1 is connected with the input end 51 and the output end 52 respectively. In the case that the first circuit breaker 1 is a single-circuit breaker, in the case that one single-circuit breaker is provided, one single-circuit breaker is connected with the input end 51 or the output end 52; in the case that two single-circuit breakers are provided, one single-circuit breaker is connected with the input end 51 and the other single-circuit breaker is connected with the output end 52.

[0100] In some embodiments, in the case that the first circuit breaker 1 in the circuit protection device 7 is a double-circuit breaker, the first circuit breaker 1 comprises a first wiring terminal 113, a second wiring terminal 114, a third wiring terminal 115 and a fourth wiring terminal 116, as shown in Figure 5 , the first wiring terminal 113 and the second wiring terminal 114 have an electrically connected state and a separated state, the first wiring terminal 113 is connected with the input end 51, and the second wiring terminal 114 is configured to be connected with the first end of the load 6; the third wiring terminal 115 and the fourth wiring terminal 116 have an electrically connected state and a separated state, the third wiring terminal 115 is connected with the output end 52, and the fourth wiring terminal 116 is configured to be connected with the second end of the load 6, so that the double-circuit breaker can be connected into the battery pack.

[0101] The circuit protection device 7 in the embodiments of the present application, the double-circuit breaker can control the on-off of two switches at the same time, for example, when the battery module 5 needs to be charged or discharged, the double-circuit breaker is closed; when the battery system is short-circuited or the vehicle fails or the charging pile fails, the double-circuit breaker is opened, the on-off of the battery pack is realized through the double-circuit breaker, and the circuit protection device 7 has the advantages of simple structure and simple operation.

[0102] In other embodiments, in the case that the first circuit breaker 1 in the circuit protection device 7 is a single-circuit breaker, the first circuit breaker 1 comprises a first wiring terminal 113 and a second wiring terminal 114, as shown in Figure 6 , the first wiring terminal 113 and the second wiring terminal 114 have an electrically connected state and a separated state, the first wiring terminal 113 is connected with the input end 51, and the second wiring terminal 114 is configured to be connected with the first end of the load 6; the first end of the second circuit breaker 8 is connected with the output end 52, and the second end of the second circuit breaker 8 is connected with the second end of the load 6, so that the single-circuit breaker can be connected into the battery pack.

[0103] In some embodiments, the battery pack further comprises a fuse 9, the second end of the second circuit breaker 8 is connected with the first end of the fuse 9, and the second end of the fuse 9 is configured to be connected with the second end of the load 6, and the fuse 9 has the function of protecting the circuit in the battery pack.

[0104] In some embodiments, the input end 51 of the battery module 5 is a positive terminal, and the output end 52 of the battery module 5 is a negative terminal.

[0105] In some embodiments, a power utilization device is provided, which comprises the battery pack as described above. Since the circuit protection device 7 is included in the battery pack, the number of components can be reduced, the material cost can be saved, and the space of the battery pack can be saved. Therefore, the power utilization device comprising the battery pack as described above can save the cost of the power utilization device and reduce the size of the power utilization device.

[0106] In some embodiments, the power utilization device is a vehicle, i.e., the vehicle comprises the circuit protection device 7 as described above, and / or the vehicle comprises the battery pack as described above.

[0107] In the embodiments of the present application, referring to FIG. 1, Figure 5 As shown in FIG. 1, the battery pack can only include the battery module 5 and the circuit protection device 7, and the circuit protection device 7 only includes the first circuit breaker 1 and the shunt 2. The first circuit breaker 1 is a restorable circuit breaker, and the first circuit breaker 1 is an element integrating the functions of a main positive relay, a main negative relay, and a main active fuse. The vehicle comprises the battery pack as described above, and the battery pack does not need to be provided with many redundant components. Therefore, the assembly cost and the component cost of the battery pack can be greatly saved, and the cost of the vehicle is further saved.

[0108] In some embodiments, the battery pack is connected to the circuit of the vehicle through the connector 66, and the circuit of the vehicle is shown in FIG. 2. Figure 5

[0109] In the vehicle, the pre-charge circuit has two functions, one is to protect the first circuit breaker 1 in the circuit protection device 7 from normal attraction, and the other is to protect the capacitor 61 from being directly inputted with an instantaneous current to cause a current impact on the capacitor 61, resulting in damage or even burning. In the vehicle of the present application, the pre-charge circuit is cancelled, but the DC-DC converter 62 and the power supply 63 are used to reversely boost the capacitor 61 for pre-charging, thereby further reducing the size of the circuit protection device in the battery pack and further reducing the cost.

[0110] In some embodiments, referring to FIG. 1, Figure 7 As shown in FIG. 1, the first circuit breaker 1 is in communication connection with the safety controller 64 and the battery management unit 65, respectively. The first circuit breaker 1 needs a short-circuit signal from the safety controller 64, and the first circuit breaker 1 and the battery management unit 65 interact with each other. The first circuit breaker 1 needs to accept the control and power supply from the battery management unit 65. Of course, this part can also be set according to actual use requirements.

[0111] ​In the embodiments of the present application, the circuit protection device, the battery pack and the electric device can be mutually referred to, and have the same or similar beneficial effects as any of the aforementioned circuit protection devices, and to avoid repetition, will not be described here.

[0112] It should be noted that the relationship EDE terms, such as first and second, are used herein only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that includes a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprises a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0113] Each of the embodiments in the specification is described in a relevant manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments.

[0114] The above only describes the preferred embodiments of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is included in the protection scope of the present application.

Claims

1. A circuit protection device, characterized in that: include: A first circuit breaker (1) comprising a connection terminal (11), wherein the first circuit breaker (1) is configured to connect or disconnect a circuit; a current detection unit (10) connected to the connection terminal (11), the current detection unit (10) being configured to detect a current flowing through the connection terminal (11); The connection terminal (11) comprises a first connection portion (111) and a second connection portion (112), wherein the first connection portion (111) and the second connection portion (112) are arranged at intervals in the direction of current flow; The current detection unit (10) includes a shunt (2), the shunt (2) includes a resistor (21), the resistor (21) is arranged between the first connecting portion (111) and the second connecting portion (112), a first end of the resistor (21) is connected to the first connecting portion (111), and a second end of the resistor (21) is connected to the second connecting portion (112).

2. The circuit protection device according to claim 1, wherein: The shunt (2) further comprises a first circuit board (22), the first circuit board (22) being electrically connected to the connection terminal (11), and the first circuit board (22) being configured to output detected current information flowing through the connection terminal (11).

3. The circuit protection device according to claim 2, wherein: The first circuit board (22) comprises: A first sampling pin (24) is connected to a first end of the resistor (21), and / or is connected to an end of the first connecting portion (111) close to the resistor (21); The second sampling pin (25) is connected to the second end of the resistor (21) and / or is connected to the end of the second connecting portion (112) close to the resistor (21).

4. The circuit protection device according to claim 3, characterized in that: A first connection position (26) and a second connection position (27) are provided on the first circuit board (22); the first connection position (26) is connected to the resistor (21), the first connection portion (111), and the first sampling pin (24); and the second connection position (27) is connected to the resistor (21), the second connection portion (112), and the second sampling pin (25).

5. The circuit protection device according to claim 2, wherein: The circuit protection device comprises a pin (3), the pin (3) being used for signal output and / or input of the circuit protection device, and the first circuit board (22) being electrically connected to the pin (3).

6. The circuit protection device according to claim 2, wherein: The first circuit breaker (1) comprises a second circuit board (12), and the first circuit board (22) and the second circuit board (12) are electrically connected.

7. The circuit protection device according to claim 6, characterized in that: The circuit protection device comprises a pin (3), the pin (3) being used for signal output and / or input of the circuit protection device, and the second circuit board (12) is connected to the pin (3).

8. The circuit protection device according to claim 1, wherein: The first circuit breaker (1) is a double-circuit circuit breaker, the wiring terminal (11) comprises a first wiring terminal (113), a second wiring terminal (114), a third wiring terminal (115) and a fourth wiring terminal (116), and the shunt (2) is connected to at least one of the first wiring terminal (113), the second wiring terminal (114), the third wiring terminal (115) and the fourth wiring terminal (116).

9. The circuit protection device according to claim 1, wherein: The first circuit breaker (1) is a single-circuit circuit breaker, the wiring terminal (11) comprises a first wiring terminal (113) and a second wiring terminal (114), and the shunt (2) is connected to at least one of the first wiring terminal (113) and the second wiring terminal (114).

10. The circuit protection device according to claim 1, wherein: The wiring terminal (11) is a copper busbar.

11. The circuit protection device according to claim 1, wherein: The circuit protection device further comprises a housing (4), wherein the first circuit breaker (1) and the current detection unit (10) are arranged in the housing (4), and at least a portion of the connection terminal (11) extends out of the housing (4).

12. The circuit protection device according to claim 1, wherein: The first circuit breaker (1) is a recoverable circuit breaker.

13. A battery pack, characterized in that: The battery pack includes the circuit protection device according to any one of claims 1 to 12.

14. The battery pack according to claim 13, wherein: The battery pack further comprises a battery module (5), wherein the battery module (5) is provided with an input terminal (51) and an output terminal (52); the first circuit breaker (1) of the circuit protection device comprises: a first wiring terminal (113) and a second wiring terminal (114), wherein the first wiring terminal (113) is connected to the input terminal (51), and the second wiring terminal (114) is configured to be connected to a first end of a load (6); A third wiring terminal (115) and a fourth wiring terminal (116), wherein the third wiring terminal (115) is connected to the output terminal (52), and the fourth wiring terminal (116) is configured to be connected to the second end of the load (6).

15. The battery pack according to claim 13, wherein: The battery pack further comprises a battery module (5), wherein the battery module (5) is provided with an input terminal (51) and an output terminal (52); the first circuit breaker (1) of the circuit protection device comprises a first connection terminal (113) and a second connection terminal (114), The first wiring terminal (113) is connected to the input terminal (51), and the second wiring terminal (114) is configured to be connected to the first end of the load (6); or the first wiring terminal (113) is connected to the output terminal (52), and the second wiring terminal (114) is configured to be connected to the second end of the load (6).

16. The battery pack according to claim 15, characterized in that: The battery pack further includes a second circuit breaker (8); The circuit protection device (7) is electrically connected between one of the input terminal (51) and the output terminal (52) and the load (6), and the second circuit breaker (8) is electrically connected between the other of the input terminal (51) and the output terminal (52) and the load (6).

17. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 13-16.

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