Power battery pack and electric equipment

Abstract

The utility model relates to a power battery pack and electric equipment. The power battery pack comprises a first battery pack, a positive contactor, a second battery pack, a negative contactor, a third battery pack and a controller; the anode of the first battery pack is connected with the first end of the load, the cathode of the first battery pack is connected with the anode of the third battery pack through the anode contactor, the second battery pack and the cathode contactor in sequence, and the cathode of the third battery pack is connected with the second end of the load; and the controller is connected with the positive contactor and the negative contactor and is used for controlling the positive contactor and the negative contactor to be disconnected during power-off. Thus, when the system is powered off, the maximum voltage in the power battery pack can be effectively reduced by disconnecting the positive contactor and the negative contactor, and the safety of the power battery pack is improved. In addition, the power battery pack is simple in spatial arrangement and low in system cost, and platform popularization can be realized.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicles, and in particular, to a power battery pack and an electric device. Background Art

[0002] With the gradual popularization of new energy vehicles, safety accidents have occurred frequently, and the safety of electric vehicles has attracted much attention. The safety of the high-voltage system of electric vehicles is particularly important. The voltage of electric vehicles is generally above 300V, which is much higher than the 12V / 24V voltage of traditional fuel vehicles.

[0003] Circuits are prone to arcing under high voltage conditions, which can damage vehicle-related parts and even cause fires. Consumers may be concerned about electric vehicle fires, leakage, and other issues when purchasing electric vehicles, so it is necessary to reduce the maximum voltage in the power battery pack under non-electricity conditions. However, in traditional high-voltage systems, the maximum voltage in the power battery pack is still high under non-electricity conditions. Utility Model Content

[0004] The purpose of the present disclosure is to provide a power battery pack and an electric device, so as to effectively reduce the maximum voltage in the power battery pack under non-power conditions and improve the safety of the power battery pack.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a power battery pack in a first aspect, including a first battery pack, a positive contactor, a second battery pack, a negative contactor, a third battery pack and a controller;

[0006] The positive electrode of the first battery group is connected to the first end of the load, the negative electrode of the first battery group is connected to the positive electrode of the third battery group through the positive electrode contactor, the second battery group, and the negative electrode contactor in sequence, and the negative electrode of the third battery group is connected to the second end of the load;

[0007] The controller is connected to the positive contactor and the negative contactor, and is used to control the positive contactor and the negative contactor to be disconnected when power is off.

[0008] Optionally, the voltage that can be provided by each of the first battery pack and the third battery pack is not greater than a voltage threshold.

[0009] Optionally, the power battery pack further includes a pre-charging unit; the pre-charging unit is connected in parallel with the positive electrode contactor;

[0010] The controller is connected to the pre-charging unit and is used to control the conduction state of the pre-charging unit.

[0011] Optionally, the pre-charging unit comprises a pre-charging resistor and a pre-charging contactor connected in series;

[0012] The controller is connected to the pre-charging contactor and is used to control the switching state of the pre-charging contactor.

[0013] Optionally, the power battery pack further includes a first insurance unit, one end of the first insurance unit is connected to the positive electrode of the first battery pack, and the other end of the first insurance unit is connected to the first end of the load.

[0014] Optionally, the power battery pack further includes a voltage monitoring unit;

[0015] The voltage monitoring unit is connected to the first end of the load, the negative electrode of the first battery pack, the positive electrode of the second battery pack, and the negative electrode of the second battery pack, and is used to collect voltages at each connection point;

[0016] The voltage monitoring unit is also connected to the controller and is used to send the collected voltage to the controller so that the controller can determine whether the positive contactor and the negative contactor are sintered based on the collected voltages at adjacent moments, and when it is determined that the contactor is sintered, control the other contactors in the power battery pack to disconnect.

[0017] Optionally, the second battery pack includes a plurality of sub-battery packs connected in series and voltage-dividing contactors connected between adjacent sub-battery packs;

[0018] The controller is also connected to the voltage-dividing contactor and is used to control the voltage-dividing contactor to disconnect when power is off.

[0019] Optionally, the second battery pack further includes a second insurance unit;

[0020] The second insurance unit is located on the branch where the sub-battery group and the voltage-dividing contactor are located.

[0021] Optionally, the power battery pack further includes a voltage monitoring unit;

[0022] The voltage monitoring unit is connected to the positive electrode of the second battery pack, the negative electrode of the second battery pack and the first end of the voltage divider contactor, and is used to collect the voltage of each connection point; wherein the first end of the voltage divider contactor is the end connected to the positive electrode of the sub-battery pack;

[0023] The voltage monitoring unit is also connected to the controller and is used to send the collected voltage to the controller so that the controller can determine whether the voltage-dividing contactor is sintered based on the collected voltages at adjacent moments, and when it is determined that the contactor is sintered, control the other contactors in the power battery pack to disconnect.

[0024] A second aspect of the present disclosure provides an electric device, comprising a load and the power battery pack provided by the first aspect of the present disclosure.

[0025] Optionally, the electric device further includes an information prompting unit;

[0026] The information prompting unit is connected to the controller and is used to provide a prompt when a fault occurs in the power battery pack.

[0027] Optionally, the information prompting unit includes at least one of a display screen and a speaker.

[0028] Optionally, the electric device is a vehicle.

[0029] Through the above technical solution, the power battery pack includes a first battery pack, a positive contactor, a second battery pack, a negative contactor, a third battery pack and a controller; the positive electrode of the first battery pack is connected to the first end of the load, the negative electrode of the first battery pack is connected to the positive electrode of the third battery pack through the positive contactor, the second battery pack and the negative contactor in sequence, and the negative electrode of the third battery pack is connected to the second end of the load; the controller is connected to the positive contactor and the negative contactor, and is used to control the positive contactor and the negative contactor to disconnect when the power is turned off. In this way, when the system is powered off, by disconnecting the positive contactor and the negative contactor, the maximum voltage in the power battery pack can be effectively reduced, thereby improving the safety of the power battery pack. In addition, the power battery pack has a simple spatial layout and a low system cost, and can be promoted on a platform basis.

[0030] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0032] Figure 1 is a block diagram of a power battery pack provided by an exemplary embodiment of the present disclosure.

[0033] Figure 2 is a schematic diagram of a power battery pack provided by an exemplary embodiment of the present disclosure.

[0034] Figure 3 is a schematic diagram of a power battery pack provided by an exemplary embodiment of the present disclosure.

[0035] Figure 4 is a schematic diagram of a power battery pack provided by an exemplary embodiment of the present disclosure.

[0036] Figure 5 is a schematic diagram of a power battery pack provided by an exemplary embodiment of the present disclosure.

[0037] Figure 6is a schematic diagram of a power battery pack provided by an exemplary embodiment of the present disclosure.

[0038] Figure 7 is a schematic diagram of a power battery pack provided by an exemplary embodiment of the present disclosure.

[0039] Description of Reference Numerals

[0040] 11 first battery group 12 second battery group 13 third battery group

[0041] 14 controller 15 first insurance unit 16 voltage monitoring unit

[0042] 121 sub-battery group 122 second insurance unit 20 load

[0043] KM1 positive contactor KM2 negative contactor KM3 pre-charge contactor

[0044] KM4 voltage divider contactor R1 pre-charging resistor DETAILED DESCRIPTION

[0045] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0046] In a traditional high-voltage system, the positive contactor, the power battery pack and the negative contactor can be connected in series in sequence. The power battery pack is composed of multiple single batteries connected in series. At present, the high-voltage components and personal safety are protected by cutting off the contactor. However, in this high-voltage system, even if the contactor is disconnected, the maximum voltage in the power battery pack is still high, which poses a safety hazard. In order to solve this problem, the present disclosure provides a power battery pack that can effectively reduce the maximum voltage inside the system when the system is powered off.

[0047] Figure 1 FIG. 1 is a block diagram of a power battery pack provided by an exemplary embodiment of the present disclosure. Figure 1 As shown, the power battery pack includes a first battery group 11 , a positive contactor KM1 , a second battery group 12 , a negative contactor KM2 , a third battery group 13 and a controller 14 .

[0048] The positive electrode of the first battery group 11 is connected to the first end of the load 20, the negative electrode of the first battery group 11 is connected to the positive electrode of the third battery group 13 through the positive electrode contactor KM1, the second battery group 12, and the negative electrode contactor KM2 in sequence, and the negative electrode of the third battery group 13 is connected to the second end of the load 20;

[0049] The controller 14 is connected to the positive contactor KM1 and the negative contactor KM2, and is used to control the positive contactor KM1 and the negative contactor KM2 to be disconnected when power is off.

[0050] exist Figure 1 In the plane direction shown, the first end of the load 20 is the upper end, and the second end of the load 20 is the lower end. The first battery pack 11, the second battery pack 12, and the third battery pack 13 can all include multiple single-cell batteries connected in series. The controller 14 can be powered by an independent power supply, or it can be connected between the negative electrode of the third battery pack 13 and the second end of the load 20, so that the first battery pack 11 can be used to control the power supply when the system is powered on.

[0051] The second battery group 12 and the third battery group 13 jointly provide energy therefor.

[0052] When the system is powered on, the controller 14 can control the positive contactor KM1 and the negative contactor KM2 to close, and the first battery pack 11, the positive contactor KM1, the second battery pack 12, the negative contactor KM2, the third battery pack 13 and the load 20 are connected in series to form a power supply circuit. When the system is powered off, the controller 14 can control the positive contactor KM1 and the negative contactor KM2 to disconnect, the connection between the first battery pack 11 and the second battery pack 12 is disconnected, and the connection between the second battery pack 12 and the third battery pack 13 is disconnected. The three cannot supply power together, so that the highest voltage in the power battery pack is the highest voltage that a single battery pack can provide. In this way, the highest voltage in the power battery pack can be effectively reduced to improve the safety of the power battery pack. In addition, the power battery pack provided by the present disclosure has a simple spatial layout and a low system cost, which can achieve platform promotion.

[0053] Through the above technical solution, the first battery pack 11, the positive contactor KM1, the second battery pack 12, the negative contactor KM2, the third battery pack 13 and the controller 14. The positive electrode of the first battery pack 11 is connected to the first end of the load 20, the negative electrode of the first battery pack 11 is connected to the positive electrode of the third battery pack 13 through the positive contactor KM1, the second battery pack 12, and the negative contactor KM2 in sequence, and the negative electrode of the third battery pack 13 is connected to the second end of the load 20; the controller 14 is connected to the positive contactor KM1 and the negative contactor KM2, and is used to control the positive contactor KM1 and the negative contactor KM2 to disconnect when the power is turned off. In this way, when the system is powered off, by disconnecting the positive contactor KM1 and the negative contactor KM2, the maximum voltage in the power battery pack can be effectively reduced, and the safety of the power battery pack can be improved. In addition, the power battery pack has a simple spatial layout and a low system cost, and can be promoted on a platform basis.

[0054] In an optional implementation, the voltage that can be provided by the first battery pack 11 and the third battery pack 13 is not greater than a voltage threshold.

[0055] For example, the voltage threshold can be set based on the safety standard, for example, it can be set to 60v. By controlling the positive contactor KM1 and the negative contactor KM2 to disconnect when the power is turned off, the highest voltage in the power battery pack in the high-voltage system can be the voltage that the second battery pack 12 can provide. If the voltage that the first battery pack 11 and the third battery pack 13 can each provide is 60v, then when the positive contactor KM1 and the negative contactor KM2 are disconnected, the highest voltage in the power battery pack can be reduced by 120v (60v+60v), effectively improving the safety of the power battery pack.

[0056] In an optional embodiment, the power battery pack may further include a pre-charging unit; the pre-charging unit is connected in parallel with the positive electrode contactor KM1;

[0057] The controller 14 is connected to the pre-charging unit and is used to control the conduction state of the pre-charging unit.

[0058] Among them, the pre-charge unit can be as follows Figure 2 As shown, it includes a pre-charging resistor R1 and a pre-charging contactor KM3 connected in series, and the controller 14 is connected to the pre-charging contactor KM3 to control the switch state of the pre-charging contactor KM3. In this way, through the setting of the pre-charging unit, the impact on various components in the power supply circuit can be alleviated when the system is powered on at high voltage, ensuring the safe operation of the system.

[0059] In an optional embodiment, the power battery pack may further include a first insurance unit 15. Figure 3 As shown, one end of the first insurance unit 15 is connected to the positive electrode of the first battery pack 11 , and the other end of the first insurance unit 15 is connected to the first end of the load 20 .

[0060] For example, the first insurance unit 15 can be a traditional fuse or an intelligent insurance module. Thus, by setting the first insurance unit 15, circuits and devices can be protected from damage caused by abnormal conditions such as current overload and short circuit, thereby further improving the safety of the power battery pack.

[0061] In an optional embodiment, the power battery pack may further include a voltage monitoring unit 16 .

[0062] The voltage monitoring unit 16 is connected to the first end of the load 20, the negative electrode of the first battery group 11, the positive electrode of the second battery group 12, and the negative electrode of the second battery group 12, and is used to collect the voltage of each connection point;

[0063] The voltage monitoring unit 16 is also connected to the controller 14 and is used to send the collected voltage to the controller 14 so that the controller 14 can determine whether the positive contactor KM1 and the negative contactor KM2 are sintered based on the collected voltages at adjacent moments, and when it is determined that the contactor is sintered, control the other contactors in the power battery pack to disconnect.

[0064] The voltage monitoring unit 16 may be a voltage sensor for collecting voltage. Figure 4 As shown, the voltage monitoring unit 16 can collect the voltages of the connection point A, the connection point B, the connection point C and the connection point D respectively, and send the collected voltages to the controller 14 . Figure 4 The connection relationship between the controller 14 and each contactor is not shown.

[0065] The controller 14 can determine whether the positive contactor KM1 and the negative contactor KM2 are sintered based on the voltages collected at adjacent moments. Specifically, it can determine whether the positive contactor KM1 and the negative contactor KM2 are sintered based on the method of judging whether the contactor is sintered by voltage in the related art, which will not be expanded here. And the controller 14 can also control other contactors in the power battery pack to disconnect when it is determined that the contactor is sintered. In this way, when it is determined that there is a problem with the contactor sintering, the electric equipment where the power battery pack is located can be controlled to not be powered on and AC charged normally, thereby improving the safety of the electric equipment.

[0066] In one embodiment, the controller 14 may also be connected to an information prompting unit of the electric device where the power battery pack is located, so as to provide a prompt when it is determined that the contactor is sintered. The information prompting unit may include at least one of a display screen and a speaker. In this way, when sintering occurs, the user can be reminded to perform maintenance in a timely manner.

[0067] In this way, the positive contactor KM1 and the negative contactor KM2 can be checked conveniently, quickly and accurately to facilitate rapid troubleshooting.

[0068] In an optional embodiment, the second battery group 12 includes a plurality of sub-battery groups 121 connected in series and a voltage dividing contactor KM4 connected between adjacent sub-battery groups;

[0069] The controller 14 is also connected to the voltage-dividing contactor KM4 and is used to control the voltage-dividing contactor KM4 to disconnect when the power is turned off.

[0070] For example, each sub-battery group 121 may include a plurality of single-cell batteries connected in series. Figure 5 As shown, the second battery pack 12 may include two sub-battery packs 121 connected in series, and the voltage divider contactor KM4 is connected between the two sub-battery packs 121. The number of single-cell batteries included in each sub-battery pack 121 may be the same or different. When the controller 14 controls the positive contactor KM1, the negative contactor KM2 and the voltage divider contactor KM4 to disconnect, the maximum voltage in the power battery pack can be further reduced, thereby improving the safety of the power battery pack.

[0071] Preferably, the difference in the number of single cells included in each sub-battery group 121 is less than a preset value, which may be 1. In this way, the voltages provided by each sub-battery group 121 are the same or similar, which can more effectively reduce the maximum voltage in the power battery pack.

[0072] In an optional embodiment, the second battery pack 12 may further include a second insurance unit 122. The second insurance unit 122 is located on the branch where the sub-battery pack 121 and the voltage dividing contactor KM4 are located.

[0073] For example, the second insurance unit 122 may be connected between any adjacent sub-battery group 121 and the voltage dividing contactor KM4, and the second insurance unit 122 may also be connected between adjacent single cells in any sub-battery group 121. Figure 6 As shown, the second insurance unit 122 is connected between the voltage divider contactor KM4 and a sub-battery group 121 adjacent to the voltage divider contactor KM4. The second insurance unit 122 can be a traditional fuse or an intelligent insurance module. Through the setting of the second insurance unit 122, the circuit and equipment can be protected from damage caused by abnormal conditions such as current overload and short circuit, thereby further improving the safety of the power battery pack.

[0074] In an optional embodiment, the power battery pack may further include a voltage monitoring unit 16;

[0075] The voltage monitoring unit 16 is connected to the positive electrode of the second battery pack 12, the negative electrode of the second battery pack 12 and the first end of the voltage divider contactor KM4, and is used to collect the voltage of each connection point, wherein the first end of the voltage divider contactor KM4 is the end connected to the positive electrode of the sub-battery pack 121;

[0076] The voltage monitoring unit 16 is also connected to the controller 14 and is used to send the collected voltage to the controller 14 so that the controller 14 can determine whether the voltage-dividing contactor KM4 is sintered based on the collected voltages at adjacent moments, and when it is determined that the contactor is sintered, control the other contactors in the power battery pack to disconnect.

[0077] For example, the second battery pack 12 includes a voltage dividing contactor KM4. Figure 7 As shown, the voltage monitoring unit 16 can collect the voltages of the connection points C, E, and D respectively, and send the collected voltages to the controller 14. Figure 7 The connection relationship between the controller 14 and each contactor is not shown in FIG. Figure 7 In the plane direction shown, the first end of the voltage dividing contactor KM4 is the lower end.

[0078] The controller 14 can determine whether the voltage-dividing contactor KM4 is sintered based on the voltage collected at adjacent moments. Specifically, it can determine whether the voltage-dividing contactor KM4 is sintered based on the method of judging whether the contactor is sintered by voltage in the related art, which will not be expanded here. And the controller 14 can also control other contactors in the power battery pack to disconnect when it is determined that the contactor is sintered. In this way, when it is determined that there is a problem of contactor sintering, the electric equipment where the power battery pack is located can be controlled to not be powered on and charged with AC normally, thereby improving the safety of the electric equipment.

[0079] In this way, the voltage dividing contactor KM4 can be checked conveniently, quickly and accurately to facilitate rapid troubleshooting.

[0080] The present disclosure further provides an electric device, which includes a load 20 and a power battery pack, and the power battery pack is the power battery pack described in any of the above embodiments.

[0081] In an optional embodiment, the electric device may further include an information prompting unit;

[0082] The information prompting unit is connected to the controller 14 and is used to give a prompt when a fault occurs in the power battery pack.

[0083] The information prompting unit may be at least one of a display screen and a speaker. For example, when the contactor is sintered, the controller 14 may generate corresponding prompt information based on the sintered contactor. The controller 14 may send the prompt information to the display screen so that the prompt information is displayed on the display screen. The prompt information may also be sent to the speaker so that the prompt information is voice broadcasted through the speaker, so that the user can promptly understand the faults of the power battery pack and remind the user to perform repairs in a timely manner.

[0084] In an optional embodiment, the electric device may be a vehicle.

[0085] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0086] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0087] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A power battery pack, characterized in that: It comprises a first battery group (11), a positive contactor (KM1), a second battery group (12), a negative contactor (KM2), a third battery group (13) and a controller (14); The positive electrode of the first battery group (11) is connected to a first end of a load (20), the negative electrode of the first battery group (11) is connected to the positive electrode of the third battery group (13) through the positive electrode contactor (KM1), the second battery group (12), and the negative electrode contactor (KM2) in sequence, and the negative electrode of the third battery group (13) is connected to a second end of the load (20); The controller (14) is connected to the positive contactor (KM1) and the negative contactor (KM2) and is used to control the positive contactor (KM1) and the negative contactor (KM2) to be disconnected when power is turned off.

2. The power battery pack according to claim 1, characterized in that: The voltage that can be provided by the first battery group (11) and the third battery group (13) is not greater than a voltage threshold.

3. The power battery pack according to claim 1, characterized in that: The power battery pack further comprises a pre-charging unit; the pre-charging unit is connected in parallel with the positive electrode contactor (KM1); The controller (14) is connected to the pre-charging unit and is used to control the conduction state of the pre-charging unit.

4. The power battery pack according to claim 3, characterized in that: The pre-charging unit comprises a pre-charging resistor (R1) and a pre-charging contactor (KM3) connected in series; The controller (14) is connected to the pre-charging contactor (KM3) and is used to control the switching state of the pre-charging contactor (KM3).

5. The power battery pack according to claim 1, characterized in that: The power battery pack further comprises a first insurance unit (15), one end of the first insurance unit (15) being connected to the positive electrode of the first battery pack (11), and the other end of the first insurance unit (15) being connected to the first end of the load (20).

6. The power battery pack according to claim 1, characterized in that: The power battery pack also includes a voltage monitoring unit (16); The voltage monitoring unit (16) is connected to the first end of the load (20), the negative electrode of the first battery group (11), the positive electrode of the second battery group (12) and the negative electrode of the second battery group (12), and is used to collect voltages at various connection points; The voltage monitoring unit (16) is also connected to the controller (14) and is used to send the collected voltage to the controller (14), so that the controller (14) determines whether the positive contactor (KM1) and the negative contactor (KM2) are sintered based on the collected voltages at adjacent moments, and when it is determined that the contactor is sintered, controls other contactors in the power battery pack to be disconnected.

7. The power battery pack according to claim 1, characterized in that: The second battery group (12) comprises a plurality of sub-battery groups (121) connected in series and a voltage dividing contactor (KM4) connected between adjacent sub-battery groups; The controller (14) is also connected to the voltage-dividing contactor (KM4) and is used to control the voltage-dividing contactor (KM4) to be disconnected when power is turned off.

8. The power battery pack according to claim 7, characterized in that: The second battery pack (12) also includes a second insurance unit (122); The second insurance unit (122) is located on the branch where the sub-battery group (121) and the voltage dividing contactor (KM4) are located.

9. The power battery pack according to claim 7, characterized in that: The power battery pack also includes a voltage monitoring unit (16); The voltage monitoring unit (16) is connected to the positive electrode of the second battery group (12), the negative electrode of the second battery group (12) and the first end of the voltage divider contactor (KM4), and is used to collect the voltage of each connection point; wherein the first end of the voltage divider contactor (KM4) is an end connected to the positive electrode of the sub-battery group (121); The voltage monitoring unit (16) is also connected to the controller (14) and is used to send the collected voltage to the controller (14), so that the controller (14) determines whether the voltage-dividing contactor (KM4) is sintered based on the collected voltages at adjacent moments, and controls other contactors in the power battery pack to be disconnected when it is determined that the contactor is sintered.

10. An electric device, characterized in that: It comprises a load (20) and a power battery pack as claimed in any one of claims 1 to 9.

11. The electric device according to claim 10, characterized in that: The electric device also includes an information prompting unit; The information prompting unit is connected to the controller (14) and is used to provide a prompt when a fault occurs in the power battery pack.

12. The electric device according to claim 11, characterized in that The information prompting unit includes at least one of a display screen and a speaker.

13. The electric device according to any one of claims 10 to 12, characterized in that: The electric device is a vehicle.

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