Circuit protection device, battery pack and electric device

Abstract

The invention relates to the technical field of batteries, in particular to a circuit protection device, a battery pack and an electric device. The circuit protection device comprises a first circuit breaker and a current detection unit, the first circuit breaker comprises a wiring terminal, and the first circuit breaker is configured to connect or disconnect a circuit; the current detection unit is connected with the wiring terminal. The current detection unit is configured to detect current flowing through the wiring terminal. According to the circuit protection device, the first circuit breaker and the current detection unit are integrated, the functions of the first circuit breaker and the current detection unit are achieved, and compared with the mode that the first circuit breaker and the current detection unit are independently arranged, the circuit protection device can reduce the number of parts and save material cost; and the circuit protection device integrates the first circuit breaker and the current detection unit, so that the total volume is relatively small, the installation space can be saved, and the installation is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular, to a circuit protection device, a battery pack, and an electrical device. Background Art

[0002] In conventional technologies, 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), a fuse, and a shunt are required for the high-voltage circuit in a battery pack for current sampling of the high-voltage circuit. The large number of components in the battery pack results in a relatively large size of the battery pack. Summary of the Invention

[0003] Embodiments of the present invention provide a circuit protection device, a battery pack, and an electrical device to solve the technical problem in the prior art that the large number of components in the battery pack results in a relatively large size of the battery pack.

[0004] In a first aspect, an embodiment of the present invention provides a circuit protection device, which includes: A first circuit breaker, including a terminal, and the first circuit breaker is configured to connect or disconnect a circuit; A current detection unit, connected to the terminal, and the current detection unit is configured to detect the current flowing through the terminal.

[0005] In some embodiments, the current detection unit includes a shunt.

[0006] In some embodiments, the terminal includes a first connection portion and a second connection portion, and the first connection portion and the second connection portion are spaced apart in the current flow direction; The shunt includes a resistor element, and the resistor element is disposed between the first connection portion and the second connection portion. A first end of the resistor element is connected to the first connection portion, and a second end of the resistor element is connected to the second connection portion.

[0007] In some embodiments, the shunt further includes a first circuit board, and the first circuit board is electrically connected to the terminal and configured to output the detected current information flowing through the terminal.

[0008] In some embodiments, the first circuit board includes A first sampling pin, connected to the first end of the resistor element and / or to an end of the first connection portion close to the resistor element; A second sampling pin, connected to the second end of the resistor element and / or to an end of the second connection portion close to the resistor element.

[0009] In some embodiments, a first connection position and a second connection position are provided on the first circuit board. The first connection position is connected to the resistor, the first connection portion, and the first sampling pin, and the second connection position is connected to the resistor, the second connection portion, and the second sampling pin.

[0010] In some embodiments, the circuit protection device includes a pin for signal output and / or input of the circuit protection device, and the first circuit board is electrically connected to the pin.

[0011] In some embodiments, the first circuit breaker includes a second circuit board, and the first circuit board is electrically connected to the second circuit board.

[0012] In some embodiments, the circuit protection device includes a pin for signal output and / or input of the circuit protection device, and the second circuit board is connected to the pin.

[0013] In some embodiments, the first circuit breaker is a two-way circuit breaker. The wiring terminals include 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.

[0014] In some embodiments, the first circuit breaker is a single-way circuit breaker. The wiring terminals include 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.

[0015] In some embodiments, the wiring terminal is a copper bar.

[0016] In some embodiments, the circuit protection device further includes a housing. The first circuit breaker and the current detection unit are disposed in the housing, and at least a part of the wiring terminal extends out of the housing.

[0017] In some embodiments, the first circuit breaker is a resettable circuit breaker.

[0018] In a second aspect, an embodiment of the present invention further provides a battery pack, which includes the circuit protection device as described above.

[0019] In some embodiments, the battery pack further includes a battery module having an input end and an output end. The first circuit breaker of the circuit protection device includes a first wiring terminal and a second wiring terminal. The first wiring terminal is connected to the input end, and the second wiring terminal is configured to be connected to the first end of a load. A third terminal and a fourth terminal, the third terminal being connected to the output terminal, and the fourth terminal being configured to be connected to a second end of the load.

[0020] In some embodiments, the battery pack further includes a battery module having an input terminal and an output terminal; the first circuit breaker of the circuit protection device includes a first terminal and a second terminal, the first terminal being connected to the input terminal, and the second terminal being configured to be connected to a first end of the load; or, the first terminal being connected to the output terminal, and the second terminal being configured to be connected to a second end of the load.

[0021] In some embodiments, the battery pack further includes a second circuit breaker; the circuit protection device is electrically connected between one of the input terminal and the output terminal and the load, and the second circuit breaker is electrically connected between the other of the input terminal and the output terminal and the load.

[0022] In a third aspect, an embodiment of the present invention further provides an electrical device, the electrical device including the battery pack as described above.

[0023] Regarding the prior art, the present invention has the following advantages: In the embodiment of the present invention, the circuit protection device includes a first circuit breaker and a current detection unit. The current detection unit is connected to the terminal to detect the current flowing through the terminal, so as to sample the loop current accessed by 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 providing the first circuit breaker and the current detection unit, the circuit protection device can reduce the number of components, save material costs, and the overall volume of the circuit protection device is relatively small after integrating the first circuit breaker and the current detection unit, which can save installation space and is convenient for installation.

[0024] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the following specifically gives the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments.

[0026] Figure 1 is a schematic structural diagram of the circuit protection device in an embodiment of the present application; Figure 2It is a partial structural schematic diagram of the circuit protection device decomposition diagram in the embodiment of the present application; Figure 3 It is a structural schematic diagram of the shunt connected to the first circuit breaker in the embodiment of the present application; Figure 4 It is a position schematic diagram of the shunt connected to the first circuit breaker in the embodiment of the present application; Figure 5 It is a simplified electrical principle schematic diagram of the battery pack and the vehicle in the embodiment of the present application Figure 1 ; Figure 6 It is a simplified electrical principle schematic diagram of the battery pack and the vehicle in the embodiment of the present application Figure 2 ; Figure 7 It is a communication connection schematic diagram of the circuit protection device in the embodiment of the present application.

[0027] Reference signs: 1. First circuit breaker; 11. Wiring terminal; 111. First connection part; 112. Second connection part; 113. First wiring terminal; 114. Second wiring terminal; 115. Third wiring terminal; 116. Fourth wiring terminal; 12. Second circuit board; 2. Shunt; 21. Resistance element; 22. First circuit board; 23. Connector; 24. First sampling pin; 25. Second sampling pin; 26. First connection position; 27. Second connection position; 3. Pin; 4. Housing; 41. First housing; 42. Second housing; 43. Bracket; 431. First mounting plate; 432. Connecting rod; 433. Second mounting plate; 5. Battery module; 51. Input end; 52. Output end; 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 implementation manners The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be completely conveyed to those skilled in the art.

[0028] Refer to Figures 1 to 4As shown in the figure, an embodiment of the present application provides a circuit protection device 7. The circuit protection device 7 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 components and save installation space.

[0029] Next, with reference to the accompanying drawings, the circuit protection device 7, battery pack, and electrical device provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0030] In some embodiments, a circuit protection device 7 is provided. The first circuit breaker 1 in the circuit protection device 7 includes a terminal 11. The first circuit breaker 1 is configured to connect or disconnect a circuit; the current detection unit 10 is connected to the terminal 11, and the current detection unit 10 is configured to detect the current flowing through the terminal 11.

[0031] The first circuit breaker 1 is a switching device that can close, carry, and break normal and abnormal currents, and is used for circuit protection (overload, short circuit, undervoltage, etc.) and power distribution. The first circuit breaker 1 is a recoverable circuit breaker, that is, the first circuit breaker 1 can be closed again after being disconnected. Therefore, the first circuit breaker 1 can be used again without replacing components after being disconnected, and the first circuit breaker 1 has the advantages of operation flexibility and safety. The current detection unit 10 is a device that can detect current. In the embodiment of the present application, the current detection unit 10 is used for sampling the loop current accessed by the circuit protection device 7.

[0032] In the circuit protection device 7 of the embodiment of the present application, the first circuit breaker 1 is electrically connected to an external structure through the terminal 11. The external structure is, for example, a battery module 5, or, for example, a load 6. The circuit protection device 7 can be connected to the circuit connecting the battery module 5 and the load 6, and is specifically set and installed according to the use requirements. The current detection unit 10 is connected to the terminal 11 to detect the current flowing through the terminal 11, so as to realize sampling of the loop current accessed by the circuit protection device 7. 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 setting the first circuit breaker 1 and the current detection unit 10, the circuit protection device 7 can reduce the number of components, save material costs, 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 is convenient for installation.

[0033] In some embodiments, when the circuit protection device 7 is in use, the load 6 is an electrical component on a vehicle, and / or the load 6 is a charger or a charging pile, etc., and is specifically set according to the use requirements.

[0034] In some embodiments, the current detection unit 10 includes a shunt 2. The shunt 2 is an instrument for measuring direct current. In the embodiments of the present application, the shunt 2 is used for sampling the loop current accessed by the circuit protection device 7.

[0035] In some other embodiments, the current detection unit 10 includes a Hall sensor. The Hall sensor is connected to the terminal 11. In this way, sampling of the loop current accessed by the circuit protection device 7 can also be achieved. Among them, the connection structure between the Hall sensor and the terminal 11 can refer to various conventional methods. For example, the terminal 11 passes through the aperture on the Hall sensor.

[0036] In some embodiments, the terminal 11 includes a first connection portion 111 and a second connection portion 112. The first connection portion 111 and the second connection portion 112 are spaced apart in the current flow direction; the shunt 2 includes a resistor element 21. The resistor element 21 is disposed between the first connection portion 111 and the second connection portion 112. The first end of the resistor element 21 is connected to the first connection portion 111, and the second end of the resistor element 21 is connected to the second connection portion 112.

[0037] In the embodiments of the present application, the shunt 2 is made based on the principle that a voltage is generated across the resistor element 21 when direct current passes through the resistor element 21. Therefore, the first connection portion 111 and the second connection portion 112 are connected through the resistor element 21, and the current flowing through the terminal 11 will all flow through the resistor element 21. The shunt 2 can achieve the purpose of detecting the current flowing through the terminal 11; moreover, after the first circuit breaker 1 and the shunt 2 are integrated, the overall volume is relatively small, which can save installation space.

[0038] It can be understood that the current flow direction is related to the wiring method of the circuit protection device 7. Therefore, the current flow direction is Figure 3 the direction shown by the arrow A in the figure, or the reverse direction of the direction shown by the arrow A.

[0039] In some embodiments, the resistor element 21 is an alloy material part. The embodiments of the present application do not specifically limit the material of the resistor element 21. For example, the resistor element 21 is a manganin alloy, and the manganin alloy has a preset resistance value (the preset resistance value is, for example, 50 ohms, 25 ohms, etc., and the preset resistance value can be set according to the use requirements), so as to calculate the current value by dividing the voltage difference between the first end and the second end of the resistor element 21 by the preset resistance value.

[0040] The resistor element 21 can be connected to the first connection portion 111 and the second connection portion 112 in a manner according to the use requirements. For example, in some embodiments, the resistor element 21 is welded to the first connection portion 111 and the second connection portion 112 respectively.

[0041] In some embodiments, the terminal 11 is a high-voltage copper busbar for electrical connection with an external structure.

[0042] In some embodiments, the shunt 2 further includes a first circuit board 22 electrically connected to the terminal 11 and configured to output the detected current information flowing through the terminal 11.

[0043] In the embodiments of the present application, the first circuit board 22 can be used for the comprehensive control of the shunt 2, enabling the shunt 2 to function as a current detector and an output unit. Thus, the circuit protection device 7 integrates the first circuit breaker 1 and the current detection unit 10, and the circuit protection device 7 functions as both the first circuit breaker 1 and the current detection unit 10.

[0044] In some embodiments, the first circuit board 22 includes a first sampling pin 24 and a second sampling pin 25 for collecting the voltages across both sides of the resistor 21. The first circuit board 22 can calculate the current flowing through the resistor 21 based on the collected voltages and the preset resistance value of the resistor 21.

[0045] There are various connection methods for the first sampling pin 24 and the second sampling pin 25. For example, the first sampling pin 24 is connected to the first end of the resistor 21, or the first sampling pin 24 is connected to the end of the first connection portion 111 close to the resistor 21, or the first sampling pin 24 is connected between the resistor 21 and the first connection portion 111, that is, connected to the resistor 21 and the first connection portion 111 respectively. For example, the second sampling pin 25 is connected to the second end of the resistor 21, or the second sampling pin 25 is connected to the end of the second connection portion 112 close to the resistor 21, or the second sampling pin 25 is connected between the resistor 21 and the second connection portion 112, that is, connected to the resistor 21 and the second connection portion 112 respectively. It can be specifically set according to the usage requirements.

[0046] When the first sampling pin 24 and the second sampling pin 25 are respectively connected to the resistor 21, the first sampling pin 24 and the second sampling pin 25 obtain the voltages across both ends of the resistor 21. When the first sampling pin 24 is connected to the first connection portion 111 and the second sampling pin 25 is connected to the second connection portion 112, the current flowing through the resistor 21 can be calculated based on the voltages of the first connection portion 111 and the second connection portion 112 and the preset resistance value of the resistor 21. The current value can be obtained by the above methods. Therefore, the connection methods of the first sampling pin 24 and the second sampling pin 25 can be set according to the usage requirements.

[0047] In some embodiments, 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.

[0048] In the embodiments of the present application, through the settings of the first connection position 26 and the second connection position 27, the first connection position 26, the resistor 21, the first connection portion 111, and the first sampling pin 24 can be connected through one assembly, and the second connection position 27, the resistor 21, the second connection portion 112, and the second sampling pin 25 can be connected through one assembly. In this way, the assembly steps can be saved; moreover, compared with setting multiple connection structures, the above connections can further save the installation space and the space occupied by the first circuit board 22 and the wiring terminal 11 after assembly. At this time, the first sampling pin 24 is respectively connected to the resistor 21 and the first connection portion 111, and the second sampling pin 25 is respectively connected to the resistor 21 and the first connection portion 111.

[0049] In some embodiments, the first connection position 26, the resistor 21, the first connection portion 111, and the first sampling pin 24 can be connected by soldering, and the second connection position 27, the resistor 21, the second connection portion 112, and the second sampling pin 25 can be connected by soldering, so that the assembly is simple, that is, the first connection position 26, the resistor 21, the first connection portion 111, and the first sampling pin 24 can be connected through one soldering, and the second connection position 27, the resistor 21, the second connection portion 112, and the second sampling pin 25 can be connected.

[0050] In some embodiments, the first circuit board 22 and the wiring terminal 11 are respectively plate-like structures, and the first circuit board 22 is fixedly connected to the wiring terminal 11. In this way, the space in the circuit protection device 7 can be saved, and the volume of the circuit protection device 7 can be set relatively small.

[0051] In some embodiments, the circuit protection device includes a pin 3. The pin 3 is used for signal output and / or input of the circuit protection device, and the first circuit board 22 is electrically connected to the pin 3. In this way, the first circuit board 22 can achieve signal output and input through the pin 3. At this time, the shunt 2 can independently achieve signal output and / or input.

[0052] It can be understood that the number of pins 3 is set according to the usage requirements. For example, as shown in Figure 2 The circuit protection device is provided with a total of 6 pins 3.

[0053] In some embodiments, the first circuit breaker 1 includes a second circuit board 12, and the first circuit board 22 is electrically connected to the second circuit board 12. In this way, signal transmission can be achieved between the first circuit breaker 1 and the shunt 2, and the circuit protection device 7 can better integrate the functions of the first circuit breaker 1 and the shunt 2 to achieve circuit protection.

[0054] In some embodiments, a connecting member 23 is provided on the first circuit board 22, and the connecting member 23 electrically connects the first circuit board 22 and the second circuit board 12. Connecting with the connecting member 23 has the advantages of simple structure and convenient connection.

[0055] In some embodiments, the second circuit board 12 is electrically connected to all the pins 3. In this way, the circuit protection device 7 can achieve signal output and / or input through the second circuit board 12. At this time, in the circuit protection device 7, signal transmission occurs between the first circuit breaker 1 and the shunt 2, and then the second circuit board 12 in the first circuit breaker 1 realizes signal output and / or input.

[0056] It can be understood that in the circuit protection device, there are multiple pins 3. The first circuit board 22 is connected to some of the pins 3, and the second circuit board 12 is connected to the remaining pins 3. The shunt 2 can independently achieve signal output and / or input, and the second circuit board 12 can independently achieve signal output and / or input.

[0057] In some embodiments, the shunt 2 is further provided with a sampling component, which is used to collect the temperature on the resistor component 21, and the sampling component is also electrically connected to the first circuit board 22. The shunt 2 collecting the temperature can avoid the risks brought by too high temperature on the resistor component 21, and can correct the current accuracy monitored by the shunt 2 through the temperature of the resistor component 21.

[0058] In some embodiments, the sampling component is a temperature sensor, and the temperature sensor is configured to collect the temperature information of the resistor component 21. It can be understood that the sampling component is set according to the usage requirements. For example, the sampling component is a thermistor or a thermocouple, and can also be other types of temperature sensors.

[0059] In some embodiments, the first circuit breaker 1 is a dual - path circuit breaker, and the wiring terminals 11 include a first wiring terminal 113, a second wiring terminal 114, a third wiring terminal 115, and a fourth wiring terminal 116. 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.

[0060] In some embodiments, when the first circuit breaker 1 is a two-way circuit breaker, the first circuit breaker 1 includes a two-way switch. One switch is located between the first terminal 113 and the second terminal 114 to control the connection or disconnection between the first terminal 113 and the second terminal 114, so that the first terminal 113 and the second terminal 114 have an electrically connected state and a separated state. The other switch is located between the third terminal 115 and the fourth terminal 116 to control the connection or disconnection between the third terminal 115 and the fourth terminal 116, so that the third terminal 115 and the fourth terminal 116 have an electrically connected state and a separated state. That is, the first circuit breaker 1 integrates the switch functions of two high-voltage relays.

[0061] When the first circuit breaker 1 is a two-way circuit breaker, the two-way switch shares one coil, which can save space in the circuit protection device 7, and can be cut off under load multiple times without affecting the performance, and has a good circuit protection function.

[0062] In some embodiments, the first circuit breaker 1 is a single-way circuit breaker, and the terminal 11 includes a first terminal 113 and a second terminal 114. The shunt 2 is connected to at least one of the first terminal 113 and the second terminal 114.

[0063] In the embodiments of the present application, the connection relationship between the shunt 2 and the first terminal 113 and the second terminal 114 can be specifically set according to the use requirements. For example, there is one shunt 2, and the shunt 2 is connected to the first terminal 113 or the second terminal 114. Refer to Figure 2 , which shows a schematic structural diagram of the shunt 2 connected to the first terminal 113. Another example is that there are two shunts 2, one shunt 2 is connected to the first terminal 113, and the other shunt 2 is connected to the second terminal 114.

[0064] In some embodiments, when the first circuit breaker 1 is a single-way circuit breaker, the first circuit breaker 1 includes one switch, and this switch is located between the first terminal 113 and the second terminal 114 to control the connection or disconnection between the first terminal 113 and the second terminal 114, so that the first terminal 113 and the second terminal 114 have an electrically connected state and a separated state.

[0065] In some embodiments, the circuit protection device further includes a housing 4. The first circuit breaker 1 and the shunt 2 are arranged in the housing 4, and at least part of the terminal 11 extends out of the housing 4.

[0066] In an embodiment of the present application, the first circuit breaker 1 and the shunt 2 are integrated within the housing 4, and the housing 4 can protect the first circuit breaker 1 and the shunt 2. A portion of the terminal 11 extends out of the housing 4 for electrical connection to an external structure, and the remaining portion of the terminal 11 is located within the housing 4. The connection between the shunt 2 and the terminal 11 is located within the housing 4. It can be understood that the terminal 11 can entirely extend out of the housing 4, which can be specifically set according to the usage requirements.

[0067] In some embodiments, the housing 4 includes a first housing 41 and a second housing 42. The first housing 41 and the second housing 42 are connected, and a channel for the terminal 11 to pass through is formed between the first housing 41 and the second housing 42.

[0068] In some embodiments, referring to Figure 2 As shown, a bracket 43 is further provided within the housing 4. The bracket 43 is used to support and mount the first circuit breaker 1 and the shunt 2. The bracket 43 includes a first mounting plate 431, a connecting rod 432, and a second mounting plate 433. The first mounting plate 431 and the second mounting plate 433 are located on both sides, and the connecting rod 432 connects the first mounting plate 431 and the second mounting plate 433.

[0069] The terminal 11 and the shunt 2 are located between the first mounting plate 431 and the second mounting plate 433, and the second circuit board 12 is fixedly connected to the second mounting plate 433.

[0070] The circuit protection device 7 of the embodiment of the present application integrates the first circuit breaker 1 and the shunt 2. The circuit protection device 7 has the functions of the first circuit breaker 1 and the shunt 2. Compared with the separately provided first circuit breaker 1 and shunt 2, integrating the first circuit breaker 1 and the shunt 2 in the circuit protection device 7 can reduce the number of components, save material costs, and save installation space. When the first circuit breaker 1 is a resettable circuit breaker, the first circuit breaker 1 can be turned on after being turned off, avoiding the increased usage cost caused by the need to unpack and replace the fuse or directly scrap it after the traditional fuse is burned out.

[0071] In some embodiments, a battery pack is provided, and the battery pack includes the circuit protection device 7 as described above.

[0072] Since the circuit protection device 7 integrates the first circuit breaker 1 and the current detection unit 10, in the battery pack, compared with separately providing the current detection unit 10 and the first circuit breaker 1, only setting the circuit protection device 7 in the battery pack can have the functions of the first circuit breaker 1 and the current detection unit 10. Thus, including the circuit protection device 7 in the battery pack can reduce the number of components, save material costs. The circuit protection device 7 has a relatively small volume, can save the installation space in the battery pack, and is convenient for installation.

[0073] The circuit protection device 7 has the function of a distribution box. Therefore, in a battery pack with a distribution box, one circuit protection device 7 can replace the distribution box, and there is no need to set many redundant components in the battery pack. Thus, the assembly cost and component cost of the battery pack can be saved significantly, and the grouping rate of the battery pack can be increased greatly.

[0074] When the circuit protection device 7 is in use, the shunt 2 can collect the current information of the terminal 11 on the first circuit breaker 1, and the current information can be sent to the battery management unit (BMU, Battery Management Unit), so that the battery management unit can monitor the operating state of the battery pack in real time.

[0075] In some embodiments, the battery pack includes a battery module 5, and the battery module 5 is provided with an input end 51 and an output end 52; the circuit protection device 7 is electrically connected to at least one of the input end 51 and the output end 52, and the circuit protection device 7 can 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.

[0076] In the embodiment of the present application, when the first circuit breaker 1 in the circuit protection device 7 is a two-way circuit breaker, one first circuit breaker 1 is respectively connected to the input end 51 and the output end 52. When the first circuit breaker 1 is a single-way circuit breaker and there is one single-way circuit breaker, one single-way circuit breaker is connected to the input end 51 or the output end 52; when there are two single-way circuit breakers, one single-way circuit breaker is connected to the input end 51, and the other single-way circuit breaker is connected to the output end 52.

[0077] In some embodiments, when the first circuit breaker 1 of the circuit protection device 7 is a two-way circuit breaker, the first circuit breaker 1 includes a first terminal 113, a second terminal 114, a third terminal 115 and a fourth terminal 116. Refer to Figure 5 As shown, the first terminal 113 and the second terminal 114 have an electrically connected state and a separated state. The first terminal 113 is connected to the input end 51, and the second terminal 114 is configured to be connected to the first end of the load 6; the third terminal 115 and the fourth terminal 116 have an electrically connected state and a separated state. The third terminal 115 is connected to the output end 52, and the fourth terminal 116 is configured to be connected to the second end of the load 6. In this way, the two-way circuit breaker can be connected to the battery pack.

[0078] For the circuit protection device 7 in the embodiment of the present application, the two-way circuit breaker can control the on / off of two switches at the same time. For example, when the battery module 5 needs to charge and discharge, the two-way circuit breaker is closed; when the battery system is short-circuited or the vehicle fails or the charging pile fails, the two-way circuit breaker is opened. The on / off of the battery pack is realized through the two-way circuit breaker, which has the advantages of simple structure and simple operation.

[0079] In some other embodiments, when the first circuit breaker 1 of the circuit protection device 7 is a single - path circuit breaker, the first circuit breaker 1 includes a first terminal 113 and a second terminal 114. Referring to Figure 6 as shown, the first terminal 113 and the second terminal 114 have an electrically connected state and a separated state. The first terminal 113 is connected to the input end 51, and the second terminal 114 is configured to be connected to the first end of the load 6; the first end of the second circuit breaker 8 is connected to the output end 52, and the second end of the second circuit breaker 8 is connected to the second end of the load 6. In this way, a single - path circuit breaker can be connected into the battery pack.

[0080] In some embodiments, the battery pack further includes a fuse 9. The second end of the second circuit breaker 8 is connected to the first end of the fuse 9, and the second end of the fuse 9 is configured to be connected to the second end of the load 6. The fuse 9 has the function of protecting the circuit in the battery pack.

[0081] In some embodiments, the input end 51 of the battery module 5 is, for example, the positive extreme, and the output end 52 of the battery module 5 is, for example, the negative extreme.

[0082] In some embodiments, there is provided an electrical device, and the electrical device includes the battery pack as described above. Since the battery pack includes the circuit protection device 7, the number of components can be reduced, the material cost can be saved, and the space of the battery pack can be saved. In this way, the electrical device including the battery pack as described above can save the cost of the electrical device and reduce the volume of the electrical device.

[0083] In some embodiments, the electrical device is a vehicle, that is, the vehicle includes the circuit protection device 7 as described above, and / or the vehicle includes the battery pack as described above.

[0084] In the embodiments of the present application, referring to Figure 5 as shown, the battery pack may only include the battery module 5 and the circuit protection device 7. The circuit protection device 7 only includes the first circuit breaker 1 and the shunt 2. The first circuit breaker 1 is a recoverable circuit breaker, and the first circuit breaker 1 is an element integrating the functions of a main positive relay, a main negative relay, and an active fuse. The vehicle includes the battery pack as described above, and the battery pack does not need to be provided with many redundant components. Thus, the assembly cost and component cost of the battery pack can be greatly saved, and further the vehicle cost can be saved.

[0085] In some embodiments, the battery pack is connected to the vehicle's circuit through a connector 66. The vehicle's circuit is referred to Figure 5 as shown.

[0086] In a vehicle, the pre-charge circuit has two functions. One is to protect the first circuit breaker 1 in the circuit protection device 7 to normally close and operate, and the other is to protect the capacitor 61 from being directly input with instantaneous current, which may cause current impact on the capacitor 61, resulting in damage or even burnout. In the vehicle of the present application, the pre-charge circuit is cancelled, but a DC-DC converter 62 and a power supply 63 are used to boost the voltage in the reverse direction to pre-charge the capacitor 61, thereby further reducing the size of the circuit protection device in the battery pack and further reducing the cost.

[0087] In some embodiments, as shown in Figure 7 the first circuit breaker 1 is respectively communicatively connected to the safety controller 64 and the battery management unit 65. The first circuit breaker 1 requires a short-circuit signal from the safety controller 64. At the same time, signal interaction occurs between the first circuit breaker 1 and the battery management unit 65, and the first circuit breaker 1 needs to receive control and power supply from the battery management unit 65. Of course, this part can also be set according to actual usage requirements.

[0088] In the embodiments of the present application, the circuit protection device, the battery pack, and the electrical device can be referred to each other, and have the same or similar beneficial effects as any of the foregoing circuit protection devices. To avoid repetition, it will not be elaborated here.

[0089] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0090] Each embodiment in this specification is described in a related manner. The same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0091] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A circuit protection device, characterized in that, Comprising: A first circuit breaker (1), including a terminal (11), the first circuit breaker (1) being configured to connect or disconnect an electrical circuit; A current detection unit (10), connected to the terminal (11), the current detection unit (10) being configured to detect the current flowing through the terminal (11).

2. The circuit protection device according to claim 1, wherein The current detection unit (10) includes a shunt (2).

3. The circuit protection device according to claim 2, characterized in that, The terminal (11) includes a first connection portion (111) and a second connection portion (112), the first connection portion (111) and the second connection portion (112) being spaced apart in the direction of current flow; The shunt (2) includes a resistive element (21), the resistive element (21) being disposed between the first connection portion (111) and the second connection portion (112), a first end of the resistive element (21) being connected to the first connection portion (111), and a second end of the resistive element (21) being connected to the second connection portion (112).

4. The circuit protection device according to claim 3, characterized in that, The shunt (2) further includes a first circuit board (22), the first circuit board (22) being electrically connected to the terminal (11), the first circuit board (22) being configured to output the detected current information flowing through the terminal (11).

5. The circuit protection device according to claim 4, characterized in that, The first circuit board (22) includes A first sampling pin (24), connected to the first end of the resistive element (21), and / or, connected to an end of the first connection portion (111) close to the resistive element (21); A second sampling pin (25), connected to the second end of the resistive element (21), and / or, connected to an end of the second connection portion (112) close to the resistive element (21).

6. The circuit protection device according to claim 5, characterized in that, A first connection location (26) and a second connection location (27) are provided on the first circuit board (22), the first connection location (26) being connected to the resistive element (21), the first connection portion (111), and the first sampling pin (24), and the second connection location (27) being connected to the resistive element (21), the second connection portion (112), and the second sampling pin (25).

7. The circuit protection device according to claim 4, characterized in that The circuit protection device includes a pin (3), the pin (3) being used for signal output and / or input of the circuit protection device, the first circuit board (22) being electrically connected to the pin (3).

8. The circuit protection device according to claim 4, characterized in that, The first circuit breaker (1) includes a second circuit board (12), the first circuit board (22) and the second circuit board (12) being electrically connected.

9. The circuit protection device according to claim 8, characterized in that, The circuit protection device includes a pin (3), the pin (3) being used for signal output and / or input of the circuit protection device, the second circuit board (12) being connected to the pin (3).

10. The circuit protection device according to claim 2, characterized in that, The first circuit breaker (1) is a two-way 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). 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).

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

12. The circuit protection device according to claim 1, characterized in that, The wiring terminal (11) is a copper bar.

13. The circuit protection device according to claim 1, wherein, The circuit protection device further includes a housing (4). The first circuit breaker (1) and the current detection unit (10) are disposed in the housing (4), and at least a part of the wiring terminal (11) extends out of the housing (4).

14. The circuit protection device according to claim 1, characterized in that, The first circuit breaker (1) is a resettable circuit breaker.

15. A battery pack, characterized in that, The battery pack includes the circuit protection device according to any one of claims 1-14.

16. The battery pack according to claim 15, characterized in that, The battery pack further includes a battery module (5). The battery module (5) is provided with an input end (51) and an output end (52). The first circuit breaker (1) of the circuit protection device includes a first wiring terminal (113) and a second wiring terminal (114). The first wiring terminal (113) is connected to the input end (51), and the second wiring terminal (114) is configured to be connected to the first end of the load (6). a third wiring terminal (115) and a fourth wiring terminal (116). The third wiring terminal (115) is connected to the output end (52), and the fourth wiring terminal (116) is configured to be connected to the second end of the load (6).

17. The battery pack according to claim 15, characterized in that, The battery pack further includes a battery module (5). The battery module (5) is provided with an input end (51) and an output end (52). The first circuit breaker (1) of the circuit protection device includes a first wiring terminal (113) and a second wiring terminal (114). The first wiring terminal (113) is connected to the input end (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 end (52), and the second wiring terminal (114) is configured to be connected to the second end of the load (6).

18. The battery pack according to claim 17, wherein, The battery pack further includes a second circuit breaker (8). The circuit protection device (7) is electrically connected between one of the input end (51) and the output end (52) and the load (6), and the second circuit breaker (8) is electrically connected between the other of the input end (51) and the output end (52) and the load (6).

19. An electrical device, characterized in that, Including the battery pack according to any one of claims 15-18.

Images