Battery Pack

Abstract

The present invention relates to the technical field of secondary batteries, and discloses a battery pack, including a battery cell and a heating assembly, wherein the battery cell includes a first pole and a second pole; the heating assembly includes a heating element, and the heating element is arranged in contact with the surface of the battery cell, and the heating element has a first power connection terminal and a second power connection terminal, wherein the first power connection terminal is connected to the first pole, and the second power connection terminal is movably arranged, and the heating element has a heating state and a closed state, wherein the second power connection terminal is connected to the second pole in the heating state, and the second power connection terminal moves away from the second pole in the closed state, thereby being disconnected from the second pole. The heating element of the present invention is in contact with the surface of the battery cell, and the heating element directly acts on the surface of the battery cell after being powered on and heated, and the heating speed is fast; the heating element can directly use the battery cell's own electricity to generate heat, and does not require an external power supply or energy, thereby reducing the energy conversion consumption, and does not introduce other components into the battery cell, thereby reducing the impact on the battery cell performance; the structure is simple, and it is suitable for different battery cells.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary batteries, and in particular to a battery pack. Background Art

[0002] Faced with the increasingly severe energy crisis and huge pressure to reduce emissions, it is an inevitable development trend for energy-saving and environmentally friendly new energy vehicles to replace traditional fuel vehicles. New energy vehicles often use lithium-ion batteries. In the low temperature environment of winter, the discharge capacity of lithium-ion batteries will be greatly reduced, and the car starting power will be insufficient, affecting the passenger experience. The commonly used heating method is to use the coolant circulation heating at the bottom of the battery pack. The coolant must be heated first, and the battery is heated by the heated coolant circulation. The heating time is long and the energy waste is large. Summary of the invention

[0003] In view of this, the present invention provides a battery pack to solve the problem of long heating time and large waste of electric energy.

[0004] The present invention provides a battery pack, comprising: a battery cell, the battery cell comprising a first pole and a second pole; a heating assembly, comprising a heating element, the heating element being arranged in contact with the surface of the battery cell, the heating assembly having a first power connection terminal and a second power connection terminal, the first power connection terminal being connected to the first pole, the second power connection terminal being movably arranged, the heating assembly having a heating state and a closed state, in the heating state, the second power connection terminal being connected to the second pole, and in the closed state, the second power connection terminal moves away from the second pole, thereby being disconnected from the second pole.

[0005] Beneficial effects: the heating element is fitted with the surface of the battery cell, and after being powered on and heated, it directly acts on the surface of the battery cell, and the heating speed is fast; the heating element is directly electrically connected to the pole of the battery cell through the first power connection terminal and the second power connection terminal, so that the heating element can directly use the battery cell's own electricity to generate heat, without the need for external power supply or energy, reducing energy conversion consumption, and no other components are introduced into the battery cell, reducing the impact on the battery cell performance; the structure is simple and suitable for different battery cells.

[0006] In an optional embodiment, a plurality of the battery core and a plurality of the heating components are provided, and at least part of the plurality of heating components is provided on at least one surface of the battery core.

[0007] In an optional embodiment, the battery pack also includes a cover assembly, a sliding assembly and a sliding drive assembly, the sliding assembly can be slidably disposed on the cover assembly, the sliding drive assembly is transmission-connected to the sliding assembly, the cover assembly is disposed above the first pole and the second pole, and the second power connection ends of several of the heating assemblies are disposed on the sliding assembly, and the sliding assembly is suitable for driving several of the second power connection ends to approach or move away from the second pole.

[0008] Beneficial effect: Several second power terminals are arranged on the sliding component, and the sliding component drives several second power terminals to slide to connect or disconnect power at the same time, ensuring that several heating elements heat or stop heating synchronously.

[0009] In an optional embodiment, the cover plate assembly includes a plate body and a connecting member, the plate body is connected to the connecting member, and the sliding assembly is slidably connected to the connecting member.

[0010] In an optional embodiment, the sliding assembly includes a mounting rod and a sliding rod, the mounting rod is connected to the sliding rod, a plurality of the second power terminals are arranged on the mounting rod, and the sliding rod is slidably connected to the connecting member.

[0011] In an optional embodiment, the sliding drive assembly includes an electromagnet and a reset member, the electromagnet is arranged on the plate body, the reset member is arranged between the mounting rod and the connecting member, the mounting rod is an iron rod, in the heating state, the electromagnet is energized, the electromagnet and the mounting rod are attracted, the second power connection end is connected to the second pole, in the closed state, the electromagnet is de-energized, the reset member makes the mounting rod away from the electromagnet, and the second power connection end is disconnected from the second pole; or,

[0012] The sliding drive assembly includes an electromagnet and a reset member, wherein the electromagnet is arranged on the plate body, and the reset member is arranged between the mounting rod and the connecting member. The sliding drive assembly also includes an iron block, which is arranged on the mounting rod and corresponds to the electromagnet. In the heating state, the electromagnet is energized, the electromagnet is attracted to the iron block, and the second power connection end is connected to the second pole. In the closed state, the electromagnet is de-energized, the reset member moves the mounting rod away from the electromagnet, and the second power connection end is disconnected from the second pole.

[0013] Beneficial effect: The electromagnet and the reset element are used to realize active control of the power supply to the heating component. When heating is not required, the power of the entire battery pack is not affected and over-discharge of the battery cells will not occur.

[0014] In an optional embodiment, the connecting member includes a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are respectively arranged on opposite sides of the mounting rod, the reset member is arranged between the mounting rod and the first connecting portion, and / or the reset member is arranged between the mounting rod and the second connecting portion.

[0015] In an optional embodiment, the sliding drive assembly includes an electromagnet, which is arranged on the plate body, and the mounting rod is a magnetic rod body. In the heating state, the electromagnet is passed through a forward current, and the magnetism of the electromagnet is opposite to that of the mounting rod, the electromagnet is attracted to the mounting rod, and the second power connection end is connected to the second pole. In the closed state, the electromagnet is passed through a reverse current, and the magnetism of the electromagnet is the same as that of the mounting rod, the mounting rod is away from the electromagnet, and the second power connection end is disconnected from the second pole; or

[0016] The sliding drive assembly includes an electromagnet, which is arranged on the plate body. The sliding drive assembly also includes a magnetic block, which is arranged on the mounting rod. In the heating state, the electromagnet is passed through a forward current, and the magnetism of the electromagnet is opposite to that of the magnetic block. The electromagnet is attracted to the mounting rod, and the second power connection end is connected to the second pole. In the closed state, the electromagnet is passed through a reverse current, and the magnetism of the electromagnet is the same as that of the mounting rod. The mounting rod is away from the electromagnet, and the second power connection end is disconnected from the second pole.

[0017] Beneficial effect: The electromagnet is used to realize active control of the power supply to the heating component. When heating is not required, the power of the entire battery pack is not affected and over-discharge of the battery cells will not occur.

[0018] In an optional embodiment, the electromagnet assembly further includes a monitoring control unit, which is electrically connected to the electromagnet and is suitable for controlling the electrical on / off of the electromagnet and / or the direction of the current flowing through the electromagnet.

[0019] In an optional embodiment, the heating component further includes a probe, the probe forms the second power connection end, the probe is connected to the heating element via a wire, in the heating state, the probe is connected to the second pole, in the closed state, the probe is away from the second pole, and thus disconnected from the second pole; and / or,

[0020] The heating component further comprises a control resistor, wherein the control resistor is connected in series between the first power connection terminal and the first pole, and / or the control resistor is connected in series between the second power connection terminal and the second pole.

[0021] Beneficial effect: By setting the control resistor, the current size inside the heating component is controlled to prevent overcurrent. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of a three-dimensional structure of a partial structure of a battery pack according to an embodiment of the present invention;

[0024] Figure 2 Another schematic diagram of a three-dimensional structure of a partial structure of a battery pack according to an embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the overall structure of a battery pack according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 10. Battery cell; 11. First pole; 12. Second pole; 20. Heating assembly; 21. Heating element; 22. Probe; 23. Control resistor; 24. Wire; 30. Cover assembly; 31. Plate body; 32. Connector; 321. First connecting part; 322. Second connecting part; 40. Sliding assembly; 41. Mounting rod; 42. Sliding rod; 50. Sliding drive assembly; 51. Electromagnet; 52. Reset element; 53. Iron block; 60. Monitoring control unit. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0030] According to an embodiment of the present invention, a battery pack is provided, comprising a battery cell 10 and a heating assembly 20. The battery cell 10 comprises a first pole 11 and a second pole 12; the heating assembly 20 comprises a heating element 21, the heating element 21 is arranged in contact with the surface of the battery cell 10, the heating assembly 20 has a first power connection terminal and a second power connection terminal, the first power connection terminal is connected to the first pole 11, and the second power connection terminal is movably arranged, and the heating assembly 20 has a heating state and a closed state, in the heating state, the second power connection terminal is connected to the second pole 12, and in the closed state, the second power connection terminal moves away from the second pole 12, thereby disconnecting from the second pole 12.

[0031] In the battery pack using this embodiment, the heating element 21 is in contact with the surface of the battery cell 10. After the heating element 21 is powered on for heating, it directly acts on the surface of the battery cell 10, and the heating speed is fast. The heating element 21 is directly electrically connected to the pole of the battery cell 10 through the first power connection terminal and the second power connection terminal, so that the heating element 21 can directly use the power of the battery cell 10 itself to generate heat, without the need for an external power supply or energy, thereby reducing the energy conversion consumption, and no other components are introduced into the battery cell 10, thereby reducing the impact on the performance of the battery cell 10. The structure is simple and suitable for different battery cells 10.

[0032] Specifically, in the present embodiment, the heating element 21 is a heating plate, and when the heating element 21 is working, it can provide an operating temperature of 20° C. to 80° C. to heat the battery cell 10 .

[0033] It should be noted that the operating temperature of the heating element 21 is related to its internal resistance, and the heating element 21 with different resistance values ​​can be replaced according to actual needs.

[0034] It should be noted that the first pole 11 may be a positive pole, in which case the second pole 12 is a negative pole; the first pole 11 may also be a negative pole, in which case the second pole 12 is a positive pole.

[0035] It is worth mentioning that please refer to Figure 1 The heating element 21 can be attached to the large surface of the battery core 10. Of course, in other alternative embodiments, the heating element 21 can also be attached to other surfaces of the battery core 10, or the heating element 21 can be attached to multiple surfaces of the battery core 10.

[0036] In one embodiment, Figure 1 As shown, the battery cell 10 and the heating assembly 20 are both provided with a plurality of heating elements 21, and at least part of the plurality of heating elements 21 is provided on at least one surface of the battery cell 10. Specifically, in this embodiment, please refer to Figure 1 Some of the heating elements 21 are disposed between two adjacent battery cells 10 , and the remaining heating elements 21 are in contact with the outermost large surfaces of several battery cells 10 .

[0037] It is worth noting that part of the heating element 21 is arranged between two adjacent battery cells 10 , and can serve as a heat-insulating flame-retardant sheet while heating the battery cells 10 , and can cut off heat conduction when thermal runaway occurs in the battery cells 10 .

[0038] Of course, in other alternative embodiments, the heating elements 21 may also be arranged on other surfaces of the battery cells 10. For example, some of the heating elements 21 may be arranged between two adjacent battery cells 10, and the remaining heating elements 21 may be arranged on the upper end surface and / or the lower end surface and / or the small surface of the battery cell 10; or, all of the heating elements 21 may be arranged corresponding to the upper end surfaces, lower end surfaces or small surfaces of several battery cells 10 at the same time.

[0039] It should be noted that one heating element 21 can be attached to multiple surfaces of the battery cell 10 .

[0040] It should be noted that one or more heating elements 21 may be disposed on a surface of the battery cell 10 .

[0041] In one embodiment, Figure 2 As shown, the battery pack also includes a cover assembly 30, a sliding assembly 40 and a sliding drive assembly 50. The sliding assembly 40 can be slidably arranged on the cover assembly 30. The sliding drive assembly 50 is transmission-connected to the sliding assembly 40. The cover assembly 30 is arranged above the first pole 11 and the second pole 12. The second power connection ends of the plurality of heating assemblies 20 are all arranged on the sliding assembly 40. The sliding assembly 40 is suitable for driving the plurality of second power connection ends to approach or move away from the second pole 12.

[0042] It is worth noting that several second power terminals are arranged on the sliding assembly 40, and the sliding assembly 40 drives several second power terminals to slide to connect or disconnect power at the same time, ensuring that several heating elements 21 heat or stop heating synchronously.

[0043] In one embodiment, Figure 2 As shown, the cover plate assembly 30 includes a plate body 31 and a connecting member 32 , the plate body 31 is connected to the connecting member 32 , and the sliding assembly 40 is slidably connected to the connecting member 32 .

[0044] In one embodiment, Figure 2 As shown, the sliding assembly 40 includes a mounting rod 41 and a sliding rod 42 . The mounting rod 41 is connected to the sliding rod 42 . A plurality of second electrical terminals are disposed on the mounting rod 41 . The sliding rod 42 is slidably connected to the connecting member 32 .

[0045] For details, please refer to Figure 2 , there are several slide bars 42. For example, three.

[0046] Of course, in other alternative implementations, the sliding rods 42 may be adjusted to other numbers according to actual conditions.

[0047] Specifically, a through hole is formed on the connecting member 32, and the sliding rod 42 is slidably disposed in the through hole.

[0048] In one embodiment, Figure 1 and Figure 2 As shown, the sliding drive assembly 50 includes an electromagnet 51 and a reset member 52. The electromagnet 51 is arranged on the plate body 31, and the reset member 52 is arranged between the mounting rod 41 and the connecting member 32. The sliding drive assembly 50 also includes an iron block 53. The iron block 53 is arranged on the mounting rod 41 and corresponds to the electromagnet 51. In the heating state, the electromagnet 51 is energized, the electromagnet 51 and the iron block 53 are attracted, and the second power connection end is connected to the second pole 12. In the closed state, the electromagnet 51 is de-energized, the reset member 52 makes the mounting rod 41 away from the electromagnet 51, and the second power connection end is disconnected from the second pole 12.

[0049] Specifically, the reset member 52 is a reset spring.

[0050] Specifically, a plurality of electromagnets 51 are provided, a plurality of iron blocks 53 are provided, and a plurality of iron blocks 53 are provided corresponding to a plurality of electromagnets 51 .

[0051] It should be noted that, in other alternative embodiments, the sliding drive assembly 50 may also be other linear drive structures, such as a linear motor, a drive cylinder, a screw rod and a motor, etc.

[0052] In other alternative embodiments, the sliding drive assembly 50 includes an electromagnet 51 and a reset member 52. The electromagnet 51 is arranged on the plate body 31, and the reset member 52 is arranged between the mounting rod 41 and the connecting member 32. The mounting rod 41 is an iron rod. In the heating state, the electromagnet 51 is energized, the electromagnet 51 and the mounting rod 41 are attracted, and the second power connection end is connected to the second pole 12. In the closed state, the electromagnet 51 is de-energized, the reset member 52 moves the mounting rod 41 away from the electromagnet 51, and the second power connection end is disconnected from the second pole 12.

[0053] It is worth noting that the electromagnet 51 and the reset member 52 are used to actively control the power supply to the heating assembly 20. When heating is not required, the power of the entire battery pack is not affected and over-discharge of the battery cell 10 will not occur.

[0054] In other alternative embodiments, the sliding drive assembly 50 includes an electromagnet 51, which is arranged on the plate body 31, and the mounting rod 41 is a magnetic rod body. In the heating state, the electromagnet 51 passes a forward current, and the magnetism of the electromagnet 51 is opposite to the magnetism of the mounting rod 41. The electromagnet 51 is attracted to the mounting rod 41, and the second power connection end is connected to the second pole 12. In the closed state, the electromagnet 51 passes a reverse current, and the magnetism of the electromagnet 51 is the same as the magnetism of the mounting rod 41. The mounting rod 41 is away from the electromagnet 51, and the second power connection end is disconnected from the second pole 12.

[0055] In other alternative embodiments, the sliding drive assembly 50 includes an electromagnet 51, which is arranged on the plate body 31. The sliding drive assembly 50 also includes a magnetic block, which is arranged on the mounting rod 41. In the heating state, the electromagnet 51 passes a forward current, and the magnetism of the electromagnet 51 is opposite to the magnetism of the magnetic block. The electromagnet 51 is attracted to the mounting rod 41, and the second power connection end is connected to the second pole 12. In the closed state, the electromagnet 51 passes a reverse current, and the magnetism of the electromagnet 51 is the same as the magnetism of the mounting rod 41. The mounting rod 41 is away from the electromagnet 51, and the second power connection end is disconnected from the second pole 12.

[0056] It is worth noting that the above two embodiments utilize the electromagnet 51 to realize active control of the power supply to the heating component 20. When heating is not required, the power of the entire battery pack is not affected and over-discharge of the battery cell 10 will not occur.

[0057] It should be noted that the electromagnet 51 contains an iron core, so when there is no need to heat the battery core 10, the above two implementations need to keep the magnetism of the electromagnet 51 the same as that of the mounting rod 41 to prevent the magnetic block from being attracted to the iron core.

[0058] In one embodiment, Figure 2 As shown, the connecting member 32 includes a first connecting portion 321 and a second connecting portion 322 , the first connecting portion 321 and the second connecting portion 322 are respectively disposed on opposite sides of the mounting rod 41 , and the reset member 52 is disposed between the mounting rod 41 and the second connecting portion 322 .

[0059] Specifically, the return spring is sleeved on the mounting rod 41 . In the heated state, the mounting rod 41 moves toward the electromagnet 51 , and the return spring is compressed to store elastic potential energy. In the closed state, the return spring releases the elastic potential energy and pushes the mounting rod 41 away from the second pole 12 .

[0060] In other alternative embodiments, the reset member 52 can also be arranged between the mounting rod 41 and the first connecting portion 321. In this embodiment, in the heated state, the reset spring stretches to store elastic potential energy, and in the closed state, the reset spring releases the elastic potential energy to pull the mounting rod 41 back in a direction away from the second pole 12.

[0061] In other alternative embodiments, the reset member 52 may also be disposed between the mounting rod 41 and the first connecting portion 321 , and between the mounting rod 41 and the second connecting portion 322 .

[0062] In one embodiment, Figure 1 and Figure 2 As shown, the electromagnet 51 assembly further includes a monitoring control unit 60 , which is electrically connected to the electromagnet 51 , and is suitable for controlling the electrical on / off of the electromagnet 51 and the direction of the current flowing through the electromagnet 51 .

[0063] Specifically, the monitoring control unit 60 can control the power-on state of the electromagnet 51 , and can also control the direction of current flow in the electromagnet 51 .

[0064] It should be noted that the monitoring control unit 60 can also monitor the temperature and voltage of the battery cell 10 , and disconnect the electromagnet 51 if the temperature of the battery cell 10 rises to a predetermined temperature and the voltage of the battery cell 10 reaches a lower protection voltage during the heating process.

[0065] In one embodiment, Figure 1 and Figure 2 As shown, the heating assembly 20 also includes a probe 22, which forms a second electrical terminal. The probe 22 is connected to the heating element 21 via a wire 24. In the heating state, the probe 22 is connected to the second pole 12. In the off state, the probe 22 is away from the second pole 12, thereby being disconnected from the second pole 12.

[0066] In one embodiment, Figure 1 As shown, the heating component 20 further includes a control resistor 23 , which is connected in series between the first power terminal and the first pole 11 .

[0067] It should be noted that the adjustment resistors with different resistance values ​​can be replaced and connected in series to the heating component 20 according to the actual required current size.

[0068] In other alternative embodiments, the control resistor 23 may also be disposed between the second power connection terminal and the second pole 12 .

[0069] In other alternative embodiments, two control resistors 23 may be provided at the same time, and the two control resistors 23 are respectively provided between the first power connection terminal and the first pole 11 , and between the second power connection terminal and the second pole 12 .

[0070] It is worth noting that, by setting the control resistor 23, the current inside the heating component 20 is controlled to prevent overcurrent.

[0071] In the battery pack using this embodiment, when the battery cell 10 needs to be heated, the monitoring and control unit 60 keeps the electromagnet 51 powered on, the electromagnet 51 generates an attractive force on the iron block 53, the mounting rod 41 moves toward the electromagnet 51 driven by the iron block 53, the return spring is compressed to store elastic potential energy, the probe 22 on the electromagnet 51 is connected to the second pole 12, and the heating element 21 is powered on; when the temperature of the battery cell 10 reaches a predetermined temperature, the monitoring and control unit 60 de-energizes the electromagnet 51, the return spring releases the elastic potential energy, pushes the mounting rod 41 away from the second pole 12, the probe 22 is disconnected from the second pole 12, and the heating element 21 stops heating.

[0072] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: A battery cell, the battery cell comprising a first pole and a second pole; A heating assembly, comprising a heating element, wherein the heating element is disposed in contact with the surface of the battery cell, the heating assembly having a first power connection end and a second power connection end, the first power connection end being connected to the first pole, the second power connection end being movably disposed, the heating assembly having a heating state and a closed state, in which the second power connection end is connected to the second pole, and in which the second power connection end is moved away from the second pole, thereby being disconnected from the second pole; The battery core and the heating assembly are both provided in plurality, and at least part of the plurality of heating elements is provided on at least one surface of the battery core; The battery pack further comprises a cover assembly, a sliding assembly and a sliding drive assembly, wherein the sliding assembly is slidably disposed on the cover assembly, the sliding drive assembly is in transmission connection with the sliding assembly, the cover assembly is disposed above the first pole and the second pole, the second power connection ends of the plurality of heating assemblies are disposed on the sliding assembly, and the sliding assembly is adapted to drive the plurality of second power connection ends to approach or move away from the second pole; The cover plate assembly comprises a plate body and a connecting piece, the plate body is connected to the connecting piece, and the sliding assembly is slidably connected to the connecting piece; The sliding assembly comprises a mounting rod and a sliding rod, the mounting rod is connected to the sliding rod, a plurality of the second power terminals are arranged on the mounting rod, and the sliding rod is slidably connected to the connecting member; The sliding drive assembly includes an electromagnet and a reset member, wherein the electromagnet is arranged on the plate body, and the reset member is arranged between the mounting rod and the connecting member, and the mounting rod is an iron rod. In the heating state, the electromagnet is energized, the electromagnet is attracted to the mounting rod, and the second power connection end is connected to the second pole. In the closed state, the electromagnet is de-energized, the reset member makes the mounting rod move away from the electromagnet, and the second power connection end is disconnected from the second pole; or, The sliding drive assembly includes an electromagnet and a reset member, wherein the electromagnet is arranged on the plate body, and the reset member is arranged between the mounting rod and the connecting member. The sliding drive assembly also includes an iron block, which is arranged on the mounting rod and corresponds to the electromagnet. In the heating state, the electromagnet is energized, the electromagnet is attracted to the iron block, and the second power connection end is connected to the second pole. In the closed state, the electromagnet is de-energized, the reset member moves the mounting rod away from the electromagnet, and the second power connection end is disconnected from the second pole.

2. The battery pack according to claim 1, characterized in that: The connecting member includes a first connecting portion and a second connecting portion, wherein the first connecting portion and the second connecting portion are respectively arranged on opposite sides of the mounting rod, the reset member is arranged between the mounting rod and the first connecting portion, and / or the reset member is arranged between the mounting rod and the second connecting portion.

3. The battery pack according to claim 1, characterized in that: The sliding drive assembly includes an electromagnet, which is arranged on the plate body, and the mounting rod is a magnetic rod body. In the heating state, the electromagnet is passed through a positive current, and the magnetism of the electromagnet is opposite to that of the mounting rod, the electromagnet is attracted to the mounting rod, and the second power connection end is connected to the second pole. In the closed state, the electromagnet is passed through a reverse current, and the magnetism of the electromagnet is the same as that of the mounting rod, the mounting rod is away from the electromagnet, and the second power connection end is disconnected from the second pole; or The sliding drive assembly includes an electromagnet, which is arranged on the plate body. The sliding drive assembly also includes a magnetic block, which is arranged on the mounting rod. In the heating state, the electromagnet is passed through a forward current, and the magnetism of the electromagnet is opposite to that of the magnetic block. The electromagnet is attracted to the mounting rod, and the second power connection end is connected to the second pole. In the closed state, the electromagnet is passed through a reverse current, and the magnetism of the electromagnet is the same as that of the mounting rod. The mounting rod is away from the electromagnet, and the second power connection end is disconnected from the second pole.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The electromagnet assembly further comprises a monitoring control unit, which is electrically connected to the electromagnet and is suitable for controlling the electrical on / off of the electromagnet and / or the direction of the current flowing through the electromagnet.

5. The battery pack according to any one of claims 1 to 3, characterized in that: The heating assembly further comprises a probe, the probe forming the second power connection end, the probe being connected to the heating element via a wire, in the heating state, the probe being connected to the second pole, and in the closed state, the probe being away from the second pole, thereby being disconnected from the second pole; and / or, The heating component further comprises a control resistor, wherein the control resistor is connected in series between the first power connection terminal and the first pole, and / or the control resistor is connected in series between the second power connection terminal and the second pole.

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