Battery pack and control method for voltage disconnection of battery pack

Abstract

The present invention discloses a battery pack and a control method for voltage disconnection of the battery pack. The battery pack includes: a housing; a plurality of battery modules; a power connection assembly; and an electric drive disconnecting device. The electric drive disconnecting device is connected to the power connection assembly, and the electric drive disconnecting device can drive the power connection assembly to move relative to the plurality of battery modules so as to electrically connect or disconnect the power connection assembly to or from the plurality of battery modules. Thus, the electric drive disconnecting device is connected to the power connection assembly, and the electric drive disconnecting device can drive the power connection assembly to move relative to the plurality of battery modules so as to electrically connect or disconnect the power connection assembly to or from the plurality of battery modules. This not only reduces the difficulty of electrically connecting or disconnecting the power connection assembly to or from the battery module, but also allows the user to directly perform operation control externally, thereby facilitating the user's operation and ensuring the user's safety.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack and a method for controlling voltage disconnection of the battery pack. Background Art

[0002] With the development of science and technology, battery packs are used more and more widely. Among them, the safety issues during transportation and use of battery packs have received more and more attention.

[0003] In the related art, on the one hand, when the battery pack voltage is high, the user is required to pull out multiple disconnecting devices one by one to disconnect multiple battery modules, which is time-consuming and labor-intensive and inconvenient for the user to operate. On the other hand, when the battery pack is assembled on the complete machine for transportation, the external connection and the switching devices in the high-voltage distribution box can only be manually disconnected, and the voltage in the battery pack cannot be further disconnected. This will cause the battery pack to have a high voltage during transportation, posing a safety hazard. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery pack, which is easier and more convenient to disconnect.

[0005] The present invention further proposes a method for controlling voltage disconnection of a battery pack.

[0006] According to the battery pack of the present invention, it includes: a shell; a plurality of battery modules, wherein the plurality of battery modules are arranged in the shell; a power connection assembly, wherein the power connection assembly is arranged on at least one side of the plurality of battery modules for electrically connecting the plurality of battery modules; and an electric drive disconnecting device, wherein the electric drive disconnecting device is connected to the power connection assembly, and the electric drive disconnecting device can drive the power connection assembly to move relative to the plurality of battery modules so as to electrically connect or disconnect the power connection assembly from the plurality of battery modules.

[0007] Thus, the electric drive disconnecting device is connected to the power connection component, and the electric drive disconnecting device can drive the power connection component to move relative to the multiple battery modules to electrically connect or disconnect the power connection component to the multiple battery modules. This not only reduces the difficulty of electrically connecting or disconnecting the power connection component and the battery module, but also allows the user to directly perform operation control externally, thereby facilitating the user's operation and ensuring the user's safety.

[0008] In some embodiments of the present invention, the electrically driven disconnecting device includes an electrically driven component and a disconnecting assembly, wherein the disconnecting assembly is connected to the power connection assembly, and the disconnecting assembly cooperates with the electrically driven component to drive the power connection assembly to move relative to the multiple battery modules under the drive of the electrically driven component.

[0009] In some embodiments of the present invention, the battery pack also includes a sliding member, which is arranged at at least one end of the arrangement of the multiple battery modules. The electric drive member is an electromagnetic member. The disconnecting assembly includes: a disconnecting member, which can be slidably arranged on the sliding member to approach or move away from the multiple battery modules. The power connection assembly is connected to the disconnecting member, and the electromagnetic member and the disconnecting member selectively magnetically attract or repel each other to make the disconnecting member slide on the sliding member and drive the power connection assembly to move.

[0010] In some embodiments of the present invention, the power connection assembly is arranged on opposite sides of the multiple battery modules. At one end where the multiple battery modules are arranged, the two disconnecting parts and the electric driving parts are two and one-to-one corresponding. The power connection assembly located on opposite sides of the multiple battery modules is connected one-to-one with the two disconnecting parts.

[0011] In some embodiments of the present invention, the electric drive component is a drive motor, and the disconnecting component includes: a transmission component and a disconnecting component. The power connection component is connected to the disconnecting component, and the transmission component is transmission-connected to the drive motor, and the disconnecting component is transmission-connected to the transmission component, so as to drive the power connection component to approach or move away from the plurality of battery modules under the transmission action of the transmission component.

[0012] In some embodiments of the present invention, the transmission member is a lead screw, and the separating member includes a nut, and the nut is threadably matched with the lead screw.

[0013] In some embodiments of the present invention, the battery pack further includes: a mechanical drive assembly, and the disconnect assembly cooperates with the mechanical drive assembly to drive the power connection assembly to move relative to the multiple battery modules under the driving action of the mechanical drive assembly.

[0014] In some embodiments of the present invention, the mechanical drive assembly includes: an operating member, a connecting rod mechanism and a pushing member, the operating member is arranged on the outer shell and one end of the operating member is exposed outside the shell, the connecting rod mechanism is arranged on the operating member, and the pushing member is arranged on the disconnecting assembly and cooperates with the connecting rod mechanism to push the disconnecting assembly and the power connection assembly close to or away from the multiple battery modules under the driving action of the connecting rod mechanism.

[0015] In some embodiments of the present invention, the operating member is a screw rod, the connecting rod mechanism is a scissor-type connecting rod mechanism, and the pushing member is a push block connected to the connecting rod connection of the scissor-type connecting rod mechanism.

[0016] In some embodiments of the present invention, the battery pack further includes: an auxiliary power supply, a first contact and a switch, the auxiliary power supply is connected to the electric drive component, and the first contact and the switch are both arranged between the auxiliary power supply and the electric drive component.

[0017] In some embodiments of the present invention, the battery pack further includes: a plurality of diodes, a DC converter and a second contact, the plurality of diodes are connected one-to-one with the plurality of battery modules, the output ends of the plurality of diodes are connected in parallel to the DC converter, the DC converter is connected to the electric drive component, and the second contact and the switch are both arranged between the DC converter and the electric drive component.

[0018] In some embodiments of the present invention, there are at least two electrically driven disconnecting devices, which are respectively arranged at two ends of the arrangement of the multiple battery modules, and the multiple electrically driven disconnecting devices share the auxiliary power supply.

[0019] In some embodiments of the present invention, the power connection assembly includes: a plurality of power connecting parts, an insulating support part and an elastic part, the plurality of power connecting parts are arranged on the insulating support part, the plurality of power connecting parts are respectively connected to the battery modules, and the elastic part elastically abuts between the side wall of the outer shell and the insulating support part.

[0020] In some embodiments of the present invention, the multiple power connectors include: a positive connector, a negative connector and an intermediate connector, the positive connector is connected to the positive electrode of the battery module arranged at one end of the multiple battery modules, the negative connector is connected to the negative electrode of the battery module arranged at the other end of the multiple battery modules, and the intermediate connector is connected between the positive and negative electrodes of two adjacent battery modules. There are multiple intermediate connectors, and the positive connector, the negative connector and the intermediate connector are arranged at intervals on the insulating support.

[0021] In some embodiments of the present invention, the disconnecting assembly comprises: a disconnecting piece, the disconnecting piece is connected to the insulating support piece, and an insulating coating layer is arranged outside the disconnecting piece and the insulating support piece.

[0022] The control method for disconnecting the voltage of the battery pack according to an embodiment of the present invention is characterized in that it includes the following steps: the electric drive component is powered on; when the electric drive component is working, the disconnecting component drives the power connecting component to electrically connect or disconnect the multiple battery modules.

[0023] In some embodiments of the present invention, before the step of energizing the electric drive component, the following steps are also included: determining the power supply mode of the electric drive component; when the auxiliary power supply works normally, the auxiliary power supply supplies power to the electric drive component; when the auxiliary power supply fails, the battery module supplies power to the electric drive component.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the present invention when a power connection assembly and a battery module are separated;

[0027] Figure 2 is a schematic diagram of a battery pack according to an embodiment of the present invention when a power connection assembly and a battery module are engaged;

[0028] Figure 3 is a partial schematic diagram of a battery pack according to an embodiment of the present invention;

[0029] Figure 4 is a partial schematic diagram of a battery pack when a power connection assembly and a battery module are engaged according to an embodiment of the present invention;

[0030] Figure 5 is a partial schematic diagram of a battery pack when the electric drive disconnecting device drives the power connection assembly and the battery module to separate according to an embodiment of the present invention;

[0031] Figure 6 is a partial schematic diagram of a battery pack when a mechanical disconnecting device according to an embodiment of the present invention drives a power connection assembly and a battery module to separate;

[0032] Figure 7 is a schematic diagram of power supply of an electric drive according to an embodiment of the present invention;

[0033] Figure 8 is a flow chart of a method for controlling voltage disconnection of a battery pack according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] 100. Battery pack;

[0036] 10. Shell;

[0037] 20. Battery module;

[0038] 30. Power connection assembly; 31. Power connection member; 32. Insulation support member; 33. Elastic member;

[0039] 40. Electric drive disconnecting device; 41. Electric drive member; 411. Electromagnetic member; 42. Disconnecting assembly; 421. Sliding member; 422. Disconnecting member; 423. Transmission member;

[0040] 50. Mechanical drive assembly; 51. Operating member; 52. Connecting rod mechanism; 53. Pushing member;

[0041] 60. Auxiliary power supply; 61. First contact; 62. Diode; 63. DC converter; 64. Second contact; 65. Switch. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0043] Reference below Figure 1-Figure 8 A battery pack 100 according to an embodiment of the present invention is described.

[0044] Combination Figure 1-Figure 7 As shown, the battery pack 100 according to an embodiment of the present invention mainly includes: a shell 10, a plurality of battery modules 20, a power connection assembly 30 and an electric drive disconnecting device 40, wherein the plurality of battery modules 20 are arranged in the shell 10, the power connection assembly 30 is arranged on at least one side of the plurality of battery modules 20 for electrically connecting the plurality of battery modules 20, the electric drive disconnecting device 40 is connected to the power connection assembly 30, and the electric drive disconnecting device 40 can drive the power connection assembly 30 to move relative to the plurality of battery modules 20 so as to electrically connect or disconnect the power connection assembly 30 with the plurality of battery modules 20.

[0045] Specifically, multiple battery modules 20 are arranged in the outer shell 10, and the power connection assembly 30 is set on one side of the multiple battery modules 20, and the power connection assembly 30 and the multiple battery modules 20 are electrically connected. When the voltage of the battery module 20 is too high, the multiple battery modules 20 need to be disconnected, that is, the power connection assembly 30 and the battery module 20 need to be separated. Therefore, the power connection assembly 30 and the electric drive disconnecting device 40 are connected. The electric drive disconnecting device 40 can drive the power connection assembly 30 to move relative to the multiple battery modules 20, so that the power connection assembly 30 is driven by the electric drive disconnecting device 40 to move away from or close to the battery module 20, and then the power connection assembly 30 is electrically connected or disconnected from the multiple battery modules 20. This not only reduces the difficulty of disconnecting the multiple battery modules 20 while ensuring the reliable disconnection of the multiple battery modules 20, but also does not require manual operation by the operator, which can reduce costs, thereby further improving the convenience and reliability of disconnecting the multiple battery modules 20. In addition, with such an arrangement, the user can operate the electric drive disconnect device 40 from the outside of the battery pack 100, which can prevent the battery pack 100 from causing harm to the operator in special circumstances and ensure the safety of the operator.

[0046] Furthermore, such a configuration can disconnect the voltage within the battery pack 100 instead of merely disconnecting the battery pack 100 from the external electrical connection. This can fundamentally eliminate the potential safety hazard caused by the high voltage of the battery pack 100, thereby further improving the reliability and safety of the battery pack 100.

[0047] Thus, the electric drive disconnecting device 40 is connected to the power connection assembly 30, and the electric drive disconnecting device 40 can drive the power connection assembly 30 to move relative to the multiple battery modules 20, so that the power connection assembly 30 is electrically connected or disconnected from the multiple battery modules 20. This not only reduces the difficulty of electrically connecting or disconnecting the power connection assembly 30 and the battery module 20, but also allows the user to directly perform operation control externally, thereby facilitating the user's operation and ensuring the user's safety.

[0048] Combination Figure 1-Figure 6 As shown, the electric-driven disconnecting device 40 includes an electric-driven component 41 and a disconnecting assembly 42. The disconnecting assembly 42 is connected to the power connection assembly 30, and the disconnecting assembly 42 cooperates with the electric-driven component 41 to drive the power connection assembly 30 to move relative to the multiple battery modules 20 under the drive of the electric-driven component 41.

[0049] Specifically, by connecting the disconnecting assembly 42 and the power connection assembly 30, and matching the disconnecting assembly 42 with the electric drive 41, the electric drive 41 can drive the disconnecting assembly 42 to approach or move away from the multiple battery modules 20. Since the power connection assembly 30 is connected to the disconnecting assembly 42, the power connection assembly 30 will be driven by the disconnecting assembly 42 to approach or move away from the multiple battery modules 20, thereby realizing the electrical connection or disconnection between the power connection assembly 30 and the multiple battery modules 20. This not only simplifies the structure of the electric-driven disconnecting device 40, but also improves the stability and reliability of the electric-driven disconnecting device 40 in driving the power connection assembly 30 to move, thereby improving the performance of the electric-driven disconnecting device 40.

[0050] In some embodiments of the present invention, Figure 4-Figure 6 As shown, it also includes a sliding member 421, which is arranged at at least one end of the arrangement of multiple battery modules 20. The electric drive member 41 is an electromagnetic member 411. The disconnecting assembly 42 includes: a disconnecting member 422, which is slidably arranged on the sliding member 421 to approach or move away from the multiple battery modules 20. The power connection assembly 30 is connected to the disconnecting member 422, and the electromagnetic member 411 and the disconnecting member 422 selectively magnetically attract or repel each other, so that the disconnecting member 422 slides on the sliding member 421 and drives the power connection assembly 30 to move. Specifically, the power connection assembly 30 and the disconnecting piece 422 are connected. After the electromagnetic component 411 is energized and generates magnetism, the electromagnetic component 411 will be magnetically attracted or magnetically repelled by the disconnecting piece 422, so that the disconnecting piece 422 slides on the sliding piece 421, and then the disconnecting piece 422 drives the power connection assembly 30 away from the multiple battery modules 20. Such a configuration can not only enable the disconnecting piece 422 to drive the power connection assembly 30 to move, making the separation of the power connection assembly 30 and the multiple battery modules 20 more direct and simple, thereby improving the reliability of the disconnection of the multiple battery modules 20 and the power connection assembly 30, but also make the structure of the electric drive disconnecting device 40 simpler, thereby simplifying the structural design of the battery pack 100, thereby facilitating the assembly and manufacturing of the battery pack 100.

[0051] In a specific embodiment of the present invention, the electromagnetic part 411 is a DC electromagnet, which is made of silicon steel sheets with faster demagnetization. The coil on the electromagnet is wound with insulated copper wire, and the disconnecting part 422 is an armature slider, and the inside of the armature slider is silicon steel. Furthermore, the maximum distance that the power connection component 30 can move away from the battery module 20 needs to be greater than the electrical gap between the power connection component 30 and the battery module 20, so that the reliability of disconnection between the power connection component 30 and the battery module 20 can be improved.

[0052] Combination Figure 4 and Figure 6As shown, the power connection assembly 30 is arranged on opposite sides of the multiple battery modules 20. At one end where the multiple battery modules 20 are arranged, there are two disconnecting pieces 422 and two electric drive pieces 41, and they correspond one to one. The power connection assemblies 30 located on opposite sides of the multiple battery modules 20 are connected one to one with the two disconnecting pieces 422. Specifically, the power connection assembly 30 is arranged on opposite sides of the multiple battery modules 20, and two disconnecting pieces 422 and two electric drive pieces 41 are arranged at one end of the arrangement of the multiple battery modules 20, and the disconnecting pieces 422 and the electric drive pieces 41 are arranged one to one. In this way, the coordination effect between the electric drive piece 41 and the disconnecting piece 422 is better, and the reliability and stability of the disconnecting piece 422 for disconnecting the power connection assembly 30 can be improved. Furthermore, the power connection components 30 on the opposite sides of the battery module 20 are connected to the two disconnecting pieces 422 one by one, which can further improve the stability of the power connection components 30 driven by the disconnecting pieces 422, thereby improving the structural reliability of the electric drive disconnecting device 40.

[0053] It should be noted that the opposite sides of the multiple battery modules 20 are the two sides where the positive and negative electrodes of the multiple battery modules 20 are located, and one end where the multiple battery modules 20 are arranged is one end of the direction in which the multiple battery modules 20 are spaced apart from each other, wherein the spacing direction of the positive and negative electrodes of the battery modules 20 is perpendicular to the direction in which the multiple battery modules 20 are spaced apart from each other.

[0054] In other embodiments of the present invention, Figure 4-Figure 6 As shown, the electric drive member 41 is a driving motor, and the disconnecting assembly 42 includes: a transmission member 423 and a disconnecting member 422. The power connection assembly 30 is connected to the disconnecting member 422, the transmission member 423 is transmission-connected to the driving motor, and the disconnecting member 422 is transmission-connected to the transmission member 423, so as to drive the power connection assembly 30 to approach or move away from the plurality of battery modules 20 under the transmission action of the transmission member 423. Specifically, the transmission member 423 is transmission-connected to the driving motor, and the driving motor can drive the transmission member 423 to move. The disconnecting member 422 is transmission-connected to the transmission member 423, so that the transmission member 423 can drive the disconnecting member 422 to move, so that the disconnecting member 422 can approach or move away from the plurality of battery modules 20 under the transmission action of the transmission member 423. This can not only make the driving of the transmission member 423 by the driving motor more stable, but also make the driving of the disconnecting member 422 by the transmission member 423 more reliable and direct, so that the structural reliability of the electric drive disconnecting device 40 can be further improved.

[0055] Furthermore, the transmission member 423 is a lead screw, and the separating member 422 includes a nut, which is threadedly engaged with the lead screw. Specifically, the transmission member 423 is set as a lead screw, and the separating member 422 is set as a nut. The lead screw rotates under the driving action of the driving motor, and the nut moves on the lead screw through the threaded engagement of the nut and the lead screw, so that the nut drives the separating member 422 to move, which can further reduce the difficulty of transmission connection between the transmission member 423 and the separating member 422.

[0056] In some further embodiments of the present invention, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the battery pack 100 may also mainly include: a mechanical drive assembly 50, and the disconnect assembly 42 cooperates with the mechanical drive assembly 50, so that the driving action of the mechanical drive assembly 50 drives the power connection assembly 30 to move relative to the multiple battery modules 20. Specifically, by setting the mechanical drive assembly 50 and matching the mechanical drive assembly 50 with the disconnect assembly 42, when the relevant components cannot normally transmit electric energy to the electric drive disconnect device 40 and the electric drive disconnect device 40 cannot work normally, the user can manually operate the mechanical drive assembly 50, and make the mechanical drive assembly 50 drive the disconnect assembly 42 to approach or move away from the battery module 20, so as to achieve electrical connection or disconnection between the disconnect assembly 42 and the multiple battery modules 20, so as to further improve the reliability of disconnection of the multiple battery modules 20, and to more comprehensively improve the safety and reliability of the battery pack 100.

[0057] Combination Figure 1 , Figure 2 and Figure 4As shown, the mechanical drive assembly 50 includes: an operating member 51, a connecting rod mechanism 52 and a pushing member 53. The operating member 51 is arranged on the outer shell 10, and one end thereof is exposed outside the outer shell 10. The connecting rod mechanism 52 is arranged on the operating member 51. The pushing member 53 is arranged on the disconnecting assembly 42 and cooperates with the connecting rod mechanism 52 to push the disconnecting assembly 42 and the power connection assembly 30 close to or away from the multiple battery modules 20 under the driving action of the connecting rod mechanism 52. Specifically, when the user wants to manually operate the mechanical drive component 50, the user can first apply force to the operating member 51, and make the operating member 51 drive the connecting rod mechanism 52 to move. Since the pushing member 53 is arranged on the disconnecting component 42, and the pushing member 53 cooperates with the connecting rod mechanism 52, the connecting mechanism can drive the pushing member 53 to move, and make the pushing member 53 push the connecting disconnecting component 42 and the power connecting component 30 to be close to or away from the multiple battery modules 20, so that the power connecting component 30 and the multiple battery modules 20 are electrically connected or disconnected. This can further enhance the directness and reliability of the driving of the disconnecting component 42 by the mechanical drive component 50, thereby further optimizing the structural design of the mechanical drive component 50.

[0058] Furthermore, the operating member 51 is a screw, the connecting rod mechanism 52 is a scissor-type connecting rod mechanism, and the pushing member 53 is a push block, and is connected to the connecting rod connection of the scissor-type connecting rod mechanism. Specifically, the operating member 51 is set as a screw, and the connecting rod mechanism 52 is set as a scissor-type connecting rod mechanism. The user can apply force to the screw to rotate the screw, and the rotation of the screw will drive the scissor-type connecting rod mechanism to move, so that the scissor-type connecting rod mechanism drives the pushing member 53 to move on the disconnecting assembly 42, and the pushing member 53 drives the power connection assembly 30 to be electrically connected or disconnected with multiple battery modules 20, which can further improve the stability and smoothness of the mutual connection and cooperation of the various components in the mechanical drive assembly 50, thereby further improving the reliability of the mechanical drive assembly 50.

[0059] Among them, the scissor-type linkage mechanism is composed of two connecting rods, one end of the two connecting rods is rotatably connected, the pusher 53 is arranged at one end of the two connecting rods, the other end of the two connecting rods is arranged on the screw, and the other end of the two connecting rods can move relatively under the rotation of the screw, that is, the distance between the other ends of the two connecting rods can change with the rotation of the screw, and the change of the distance between the other ends of the two connecting rods can drive the movement of one end of the two connecting rods, thereby realizing the driving of the pusher 53 by the scissor-type linkage mechanism. Further, the scissor-type linkage mechanism is arranged at both ends of the screw, and the whole constitutes a parallelogram. The pusher 53 is arranged at both ends of the screw, and the pusher 53 is connected and matched with the scissor-type linkage mechanism at both ends of the screw. In addition, through the self-locking force of the screw and the scissor-type linkage mechanism, the power connection assembly 30 and the battery module 20 can be kept in a long-term disconnected state, which can improve the stability and safety of the battery pack 100.

[0060] Combination Figure 6-Figure 7 As shown, the battery pack 100 may also mainly include: an auxiliary power supply 60, a first contact 61 and a switch 65. The auxiliary power supply 60 is connected to the electric drive 41, and the first contact 61 and the switch 65 are both arranged between the auxiliary power supply 60 and the electric drive 41. Specifically, the first contact 61 and the switch 65 are both arranged between the auxiliary power supply 60 and the electric drive 41. When the first contact 61 and the switch 65 are closed, the auxiliary power supply 60 and the electric drive 41 are interconnected, and the auxiliary power supply 60 will continuously and stably supply power to the electric drive 41, thereby maintaining the normal operation of the electric drive 41.

[0061] Combination Figure 6 As shown, the battery pack 100 may also mainly include: a plurality of diodes 62, a DC converter 63 and a second contact 64. The plurality of diodes 62 are connected to the plurality of battery modules 20 in one-to-one correspondence. The output ends of the plurality of diodes 62 are connected in parallel to the DC converter 63. The DC converter 63 is connected to the electric drive 41. The second contact 64 and the switch 65 are arranged between the DC converter 63 and the electric drive 41. Specifically, the plurality of diodes 62 are connected to the plurality of battery modules 20 in one-to-one correspondence, so that the current output by the battery module 20 can circulate. Further, after the current flows out of the diode 62 to the DC converter 63, the DC converter 63 can convert the high voltage output by the battery module 20 into the low voltage required by the electric drive 41, and transmit the low voltage current to the electric drive 41, so that the battery module 20 can supply power to the electric drive 41 stably and reliably.

[0062] Furthermore, the second contact 64 and the switch 65 are both arranged between the DC converter 63 and the electric drive 41. When the auxiliary power supply 60 fails and cannot supply power to the electric drive 41, the second contact 64 and the switch 65 are closed, and the first contact 61 is opened, so that the auxiliary power supply 60 is disconnected from the electric drive 41, and the multiple battery modules 20 supply power to the electric drive 41. Correspondingly, when the auxiliary power supply 60 is normal, the first contact 61 can be closed and the second contact 64 can be opened, so that the auxiliary power supply 60 can supply power to the electric drive 41, and the multiple battery modules 20 can be disconnected from the electric drive 41. In this way, the amount of current transmitted by the battery module 20 to the electric drive 41 can be reduced as much as possible under the premise of ensuring the normal operation of the electric drive 41, so that the stability and reliability of the electric energy storage of the battery pack 100 can be ensured.

[0063] It should be noted that the switch 65 is in a normally closed state. When the auxiliary power supply 60 is normal, the auxiliary power supply 60 is preferentially used, that is, the first contact 61 is closed and the second contact 64 is opened. When the auxiliary power supply 60 fails, the battery module 20 supplies power to the electric drive 41, that is, the first contact 61 is opened and the second contact 64 is closed. In addition, when the electric drive disconnecting device 40 fails or the battery module 20 fails, the switch 65 is opened to avoid special circumstances that may harm the operator, which can further improve the safety of the battery pack 100.

[0064] Combination Figure 1 and Figure 2 As shown, there are at least two electric drive disconnecting devices 40, which are respectively arranged at both ends of the arrangement direction of the multiple battery modules 20, and the multiple electric drive disconnecting devices 40 share the auxiliary power supply 60. Specifically, at least two electric drive disconnecting devices 40 are arranged, and the electric drive disconnecting devices 40 are arranged at both ends of the arrangement direction of the multiple battery modules 20, so that the multiple electric drive disconnecting devices 40 share the auxiliary power supply 60, which can not only improve the effect of the electric drive disconnecting device 40, but also further improve the reliability and stability of the electric drive disconnecting device 40.

[0065] Combination Figure 1 and Figure 3 As shown, the power connection assembly 30 includes: multiple power connectors 31, insulating supports 32 and elastic members 33. The multiple power connectors 31 are arranged on the insulating supports 32. The multiple power connectors 31 are respectively connected to the battery modules 20. The elastic members 33 elastically abut between the side wall of the outer shell 10 and the insulating supports 32. Specifically, multiple power connectors 31 are connected to the battery module 20, and the elastic member 33 is arranged between the side wall of the outer shell 10 and the insulating support member 32. When the power connector 31 is driven by the electric drive disconnecting device 40 or the mechanical drive assembly 50 to move away from the battery module 20, the insulating support member 32 will follow the movement of the power connector 31 and move in the direction away from the battery module 20. Since the elastic member 33 abuts between the side wall of the outer shell 10 and the insulating support member 32, the insulating support member 32 will squeeze the elastic member 33. After the electric drive disconnecting device 40 or the mechanical drive assembly 50 removes the driving force on the power connector 31, the squeezed elastic member 33 will drive the insulating support member 32 and the power connector 31 to move in the direction close to the battery module 20, and reconnect the power connector 31 with the battery module 20.

[0066] Furthermore, when the power connector 31 and the battery module 20 are connected, the elastic member 33 will also be in a compressed state. The elastic member 33 in the compressed state will play an elastic abutment role on the power connector 31, thereby making the connection between the power connector 31 and the battery module 20 more stable and firm.

[0067] Furthermore, the elastic member 33 is made of highly elastic carbon spring steel wire, and the rigidity modulus of the carbon spring steel wire is 7900N / mm 2 The contact retention force between the power connector 31 and the surface of the battery module 20 should be 50N, and the contact surface current density should be less than 0.31A / mm 2 .

[0068] Furthermore, the multiple power connectors 31 include: a positive connector, a negative connector and an intermediate connector. The positive connector is connected to the positive electrode of the battery module 20 arranged at one end of the multiple battery modules 20, the negative connector is connected to the negative electrode of the battery module 20 arranged at the other end of the multiple battery modules 20, and the intermediate connector is connected between the positive and negative electrodes of two adjacent battery modules 20. There are multiple intermediate connectors, and the positive connector, the negative connector and the multiple intermediate connectors are arranged at intervals on the insulating support 32. Specifically, the positive connector is connected to the positive electrode of the battery module 20 arranged at one end of the multiple battery modules 20, the negative connector is connected to the negative electrode of the battery module 20 arranged at the other end of the multiple battery modules 20, and the intermediate connector is connected between the positive and negative electrodes of two adjacent battery modules 20. There are multiple intermediate connectors, and the positive connector, the negative connector and the multiple intermediate connectors are arranged at intervals on the insulating support 32. This can not only simplify the structure of the power connector 31, but also make the electrical connection between the power connector 31 and the multiple battery modules 20 more direct and reliable, which can further optimize the structural design of the power connector 31.

[0069] Combination Figure 1-Figure 3 As shown, the disconnecting assembly 42 may mainly include: a disconnecting piece 422, the disconnecting piece 422 is connected to the insulating support 32, and an insulating coating is provided outside the disconnecting piece 422 and the insulating support 32. Specifically, an insulating coating is provided outside the disconnecting piece 422 and the insulating support 32, so that not only the disconnecting piece 422 can drive the movement of the insulating support 32 more directly and reliably, but also the insulating coating can protect the disconnecting piece 422 and the insulating support 32, so that the structural reliability of the disconnecting assembly 42 and the power connection assembly 30 can be further improved. Furthermore, an insulating coating is also provided outside the insulating support 32 and the power connection 31, so that not only the insulating support 32 can drive the movement of the power connection 31 more directly, but also the outside of the insulating support 32 and the power connection 31 can be covered and protected, so that the structural reliability of the battery pack 100 can be further improved.

[0070] Combination Figure 8As shown, the control method for voltage disconnection of the battery pack 100 according to an embodiment of the present invention includes the following steps: the electric drive component 41 is powered on; the electric drive component 41 works, and the disconnecting component 42 drives the power connecting component 30 to electrically connect or disconnect multiple battery modules 20.

[0071] Specifically, the electric driver 41 is energized and operates normally, the electric driver 41 cooperates with the disconnecting component 42, and the disconnecting component 42 drives the power connection component 30 to electrically connect or disconnect multiple battery modules 20. This can make the operation of the electric driver 41 more stable, thereby making the disconnection of the battery voltage more reliable.

[0072] Combination Figure 8 As shown, before the step of energizing the electric drive component 41, the following steps are also included: determining the power supply mode of the electric drive component 41; when the auxiliary power supply 60 works normally, the auxiliary power supply 60 supplies power to the electric drive component 41; when the auxiliary power supply 60 fails, the battery module 20 supplies power to the electric drive component 41.

[0073] Specifically, the power supply mode of the electric drive component 41 is first determined. When the auxiliary power supply 60 works normally, the relay coil is charged, the first contact 61 is closed, and the second contact 64 is disconnected. The auxiliary power supply 60 supplies power to the electric drive component 41, and the electric drive component 41 is energized and starts working. The disconnecting component 42 drives the power connection component 30 to electrically connect or disconnect multiple battery modules 20, and the voltage of the battery pack 100 is selectively disconnected.

[0074] Correspondingly, when the auxiliary power supply 60 fails, the relay coil is not charged, the first contact 61 is disconnected, the second contact 64 is closed, the battery module 20 outputs a high voltage, which is stepped down by the DC converter 63 and then transmitted to the electric drive 41. The electric drive 41 is energized and starts working, and the disconnecting component 42 drives the power connection component 30 to electrically connect or disconnect multiple battery modules 20.

[0075] Further, the first contact 61 and the second contact 64 are both opened, the electric drive component 41 stops working, the power connection assembly 30 is electrically connected to the battery module 20 under the action of the elastic member 33, and the voltage of the battery pack 100 is restored.

[0076] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0078] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: shell; A plurality of battery modules, wherein the plurality of battery modules are arranged in the housing; A power connection assembly, the power connection assembly being disposed on at least one side of the plurality of battery modules to electrically connect the plurality of battery modules; The power connection assembly comprises: a plurality of power connection members, an insulating support member and an elastic member, wherein the plurality of power connection members are arranged on the insulating support member, the plurality of power connection members are respectively connected to the battery modules, and the elastic member elastically abuts between the side wall of the housing and the insulating support member; and An electric-driven disconnecting device, the electric-driven disconnecting device is connected to the power connection assembly, and the electric-driven disconnecting device can drive the power connection assembly to move relative to the multiple battery modules so as to electrically connect or disconnect the power connection assembly from the multiple battery modules; the electric-driven disconnecting device includes an electric drive member and a disconnecting assembly; The elastic member is always in a compressed state when the power connector and the battery module are electrically connected or disconnected.

2. The battery pack according to claim 1, characterized in that: The disconnecting assembly is connected to the power connection assembly, and the disconnecting assembly cooperates with the electric driving component to drive the power connection assembly to move relative to the multiple battery modules under the drive of the electric driving component.

3. The battery pack according to claim 2, characterized in that: It also includes a sliding part, which is arranged at at least one end of the arrangement of the multiple battery modules. The electric drive part is an electromagnetic part. The disconnecting assembly includes: a disconnecting part, which can be slidably arranged on the sliding part to approach or move away from the multiple battery modules. The power connection assembly is connected to the disconnecting part. The electromagnetic part and the disconnecting part selectively magnetically attract or repel each other to make the disconnecting part slide on the sliding part and drive the power connection assembly to move.

4. The battery pack according to claim 3, characterized in that: The power connection components are arranged on opposite sides of the multiple battery modules. At one end where the multiple battery modules are arranged, there are two disconnecting parts and two electric drive parts that correspond one to one. The power connection components located on opposite sides of the multiple battery modules are connected one to one with the two disconnecting parts.

5. The battery pack according to claim 2, characterized in that: The electric drive component is a driving motor, and the disconnecting component includes: a transmission component and a disconnecting component. The power connection component is connected to the disconnecting component, and the transmission component is transmission-connected to the driving motor, and the disconnecting component is transmission-connected to the transmission component, so that the power connection component is driven to approach or move away from the plurality of battery modules under the transmission action of the transmission component.

6. The battery pack according to claim 5, characterized in that: The transmission member is a lead screw, and the separating member comprises a nut, which is threadably matched with the lead screw.

7. The battery pack according to any one of claims 1 to 6, characterized in that: Also includes: A mechanical drive assembly, wherein the disconnect assembly cooperates with the mechanical drive assembly to drive the power connection assembly to move relative to the multiple battery modules under the driving action of the mechanical drive assembly.

8. The battery pack according to claim 7, characterized in that: The mechanical drive assembly includes: an operating member, a connecting rod mechanism and a pushing member, wherein the operating member is arranged on the outer shell and one end thereof protrudes out of the shell, the connecting rod mechanism is arranged on the operating member, and the pushing member is arranged on the disconnecting assembly and cooperates with the connecting rod mechanism to push the disconnecting assembly and the power connection assembly toward or away from the multiple battery modules under the driving action of the connecting rod mechanism.

9. The battery pack according to claim 8, characterized in that: The operating member is a screw rod, the connecting rod mechanism is a scissor-type connecting rod mechanism, and the pushing member is a push block connected to the connecting rod connection of the scissor-type connecting rod mechanism.

10. The battery pack according to claim 1, characterized in that: Also includes: An auxiliary power supply, a first contact and a switch, wherein the auxiliary power supply is connected to the electric drive component, and the first contact and the switch are both arranged between the auxiliary power supply and the electric drive component.

11. The battery pack according to claim 10, characterized in that: Also includes: A plurality of diodes, a DC converter and a second contact, wherein the plurality of diodes are connected one-to-one with the plurality of battery modules, the output ends of the plurality of diodes are connected in parallel to the DC converter, the DC converter is connected to the electric drive component, and the second contact and the switch are both arranged between the DC converter and the electric drive component.

12. The battery pack according to claim 10, characterized in that: There are at least two electrically driven disconnecting devices, which are respectively arranged at two ends of the arrangement of the multiple battery modules, and the multiple electrically driven disconnecting devices share the auxiliary power supply.

13. The battery pack according to claim 1, characterized in that: The multiple power connectors include: a positive connector, a negative connector and an intermediate connector. The positive connector is connected to the positive electrode of the battery module arranged at one end of the multiple battery modules, the negative connector is connected to the negative electrode of the battery module arranged at the other end of the multiple battery modules, and the intermediate connector is connected between the positive and negative electrodes of two adjacent battery modules. There are multiple intermediate connectors, and the positive connector, the negative connector and the multiple intermediate connectors are arranged at intervals on the insulating support.

14. The battery pack according to claim 1, characterized in that: The disconnecting assembly comprises: a disconnecting piece, wherein the disconnecting piece is connected to the insulating support piece, and an insulating coating layer is arranged outside the disconnecting piece and the insulating support piece.

15. A method for controlling voltage disconnection of the battery pack according to any one of claims 1 to 14, characterized in that: The following steps are involved: The electric drive element is energized; When the electric drive component is working, the disconnecting component drives the power connecting component to electrically connect or disconnect the plurality of battery modules.

16. The method for controlling voltage disconnection of the battery pack according to claim 15, characterized in that: Before the step of energizing the electric drive component, the following steps are also included: Determine the power supply mode of the electric drive component: When the auxiliary power supply operates normally, the auxiliary power supply supplies power to the electric drive component; When the auxiliary power supply fails, the battery module supplies power to the electric drive component.

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