Heating device and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a heating device and a battery pack, and the heating device comprises a heating wire, a box body and a cold plate. The box body is provided with a heating cavity, the heating wire is arranged in the heating cavity, and the heating cavity is provided with a water inlet hole and at least two flow dividing holes. The cold plate comprises a water outlet cavity, a water inlet cavity and at least two flow dividing cavities, the flow dividing cavities communicate with the water outlet cavity, the water inlet cavity communicates with the water inlet hole of the heating cavity, and the flow dividing cavities communicate with the flow dividing holes of the heating cavity in a one-to-one correspondence mode. And the battery core is heated by the cold plate, so that a heating film in the bag can be saved, the design is simpler, and the actual assembly is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a heating device and a battery pack. BACKGROUND

[0002] With the vigorous development of the new energy industry, people's requirements for related technical indicators of battery packs are also constantly improving. Among them, the performance of the battery in the battery pack is significantly affected by the ambient temperature, especially in low temperature environments, the energy and power characteristics of the battery will be severely attenuated, so the battery needs to be heated in low temperature conditions.

[0003] The current widely used heating system for battery heating includes cold plate cooling liquid heating (liquid heating) and heating film heating (film heating). Cold plate cooling liquid heating is a common way of battery heating, and its working principle is to set a cooling flow channel between the battery modules, or use a cooling plate, to circulate the cooling liquid (such as a mixture of water and ethylene glycol) inside the battery pack, and use the heat transfer characteristics of the heated cooling liquid to heat the battery. Heating film heating is another common way of battery heating, and its working principle is to high-temperature sinter insulation medium, heating resistor and other materials on a specific base metal to form a heating film, and then paste the heating film on the surface of the battery or embed it in the battery. The battery is heated by the resistance heating of the heating film.

[0004] Among them, the film heating system needs to add a heating film in the battery pack, which will increase the cost of the entire battery pack, and the film heating uniformity of the battery is poor, which will affect the performance of the whole pack. And the current liquid heating system usually needs to be matched with a direct current PTC (Positive Temperature Coefficient, positive temperature coefficient effect) heating module, which will also directly affect the cost, and will not be able to be used when space arrangement is limited. Therefore, the above two heating methods both have the technical defects of complex structure and high cost. UTILITY MODEL CONTENT

[0005] Therefore, the present application provides a heating device and a battery pack to solve the problems of complex structure and high cost.

[0006] In a first aspect, the present application provides a heating device, comprising a heating wire, a box body and a cold plate. The box body is provided with a heating cavity, the heating wire is arranged in the heating cavity, and the heating cavity is provided with a water inlet hole and at least two shunt holes. The cold plate comprises a water outlet cavity, a water inlet cavity and at least two shunt cavities, the shunt cavities are in communication with the water outlet cavity, the water inlet cavity is in communication with the water inlet hole of the heating cavity, and the shunt cavities are arranged and communicated one by one with the shunt holes of the heating cavity.

[0007] Beneficial effects: The heating device can make the cooling liquid entering the water inlet cavity of the cold plate first enter the heating cavity of the box body for heating, and then the heated cooling liquid enters the flow distribution cavity to heat the battery, which not only realizes effective heating of the cooling liquid, but also ensures uniform distribution of the cooling liquid in the battery pack through the design of the flow distribution cavity. This design avoids the problem of local overheating or uneven temperature that may occur in traditional heating methods, thereby improving the performance and life of the battery pack. In addition, the structure of the device is simple, easy to manufacture and maintain, and reduces production costs. It is particularly pointed out that the heating device in the present application can cool the battery through the cooling liquid by not supplying power to the heating wire.

[0008] In an alternative embodiment, the cold plate comprises a first flow distribution cavity and a second flow distribution cavity. The box body comprises a base provided with a first sink, the bottom of the first sink is provided with a first flow distribution hole, a second flow distribution hole and the water inlet hole, and the first flow distribution hole and the second flow distribution hole are located on both sides of the water inlet hole, respectively. The first flow distribution cavity communicates with the first flow distribution hole, the second flow distribution cavity communicates with the second flow distribution hole, and the heating wire is at least partially arranged in the first sink.

[0009] Beneficial effects: By providing two flow distribution cavities and arranging two flow distribution holes on both sides of the water inlet hole, the flow efficiency and heating effect of the cooling liquid are further improved.

[0010] In an alternative embodiment, the box body further comprises a top cover provided with a second sink, and the top cover is detachably connected with the base, so that the first sink and the second sink form the heating cavity.

[0011] Beneficial effects: The detachable connection design of the base and the top cover facilitates cleaning of the heating cavity and replacement and maintenance of the heating wire, ensuring long-term stable operation of the heating device, and by making the first sink and the second sink together form the heating cavity, the heating wire is only partially located in the sink, facilitating the removal of the heating wire.

[0012] In an alternative embodiment, the cold plate further comprises a lower plate and an upper plate.

[0013] The lower plate is provided with a water inlet groove, a first flow distribution groove, a second flow distribution groove and a water outlet groove on the surface, and the first flow distribution groove and the second flow distribution groove both communicate with the water outlet groove.

[0014] The upper plate is connected with the lower plate and closes the groove openings of the water inlet groove, the first flow distribution groove, the second flow distribution groove and the water outlet groove, respectively, to form the water inlet cavity, the first flow distribution cavity, the second flow distribution cavity and the water outlet cavity.

[0015] Beneficial effects: The combined design of the lower plate and the upper plate not only simplifies the manufacturing process of the cold plate, but also improves the overall strength and durability of the cold plate. The reasonable arrangement of the water inlet groove, the first shunt groove, the second shunt groove and the water outlet groove ensures the uniform flow and effective heating of the cooling liquid inside the cold plate.

[0016] In an alternative embodiment, the upper plate is provided with a first through hole, a second through hole and a third through hole, the first through hole communicates the first shunt cavity with the first shunt hole, the second through hole communicates the second shunt cavity with the second shunt hole, and the third through hole communicates the water inlet cavity with the water inlet hole.

[0017] Beneficial effects: The arrangement of the first through hole, the second through hole and the third through hole ensures the smooth flow of the cooling liquid inside the cold plate and the effective connection with the heating cavity. This design not only improves the heating efficiency of the heating device, but also avoids the problem of uneven heating or poor heating effect caused by poor flow of the cooling liquid.

[0018] In an alternative embodiment, the water inlet groove, the first shunt groove, the second shunt groove and the water outlet groove are formed by stamping the lower plate, and the first shunt groove and the second shunt groove are symmetrically arranged on both sides of the lower plate.

[0019] Beneficial effects: The water inlet groove, the first shunt groove, the second shunt groove and the water outlet groove are formed by stamping the lower plate, which not only improves the overall strength and stability of the cold plate, but also avoids the problem of cooling liquid leakage or poor heating effect caused by the connection between the components. In addition, this design makes the manufacturing process of the cold plate more simple and efficient. The design of two symmetrical shunt grooves is beneficial to improve the uniformity of heating.

[0020] In an alternative embodiment, the heating wire is spirally arranged along a first direction, and the first direction is the same as the length direction of the heating cavity.

[0021] Beneficial effects: The spiral arrangement of the heating wire not only improves the heating efficiency, but also makes the heating wire more evenly distributed in the heating cavity.

[0022] In an alternative embodiment, the heating wire includes a heating core, an insulating layer and a protective sleeve, the insulating layer is arranged on the outer circumferential surface of the heating core, and the protective sleeve is arranged on the outer circumferential surface of the insulating layer.

[0023] Beneficial effects: The arrangement of the insulating layer and the protective sleeve ensures the safety and stability of the heating wire during heating, and avoids the safety hazards caused by overheating or short circuit.

[0024] In a second aspect, the application also provides a battery pack, comprising a box body and a heating device.

[0025] The box body is arranged as a frame structure with two opposite open sides. The cold plate of the heating device is attached to one of the open sides of the box body, and the box body of the heating device is arranged in the box body.

[0026] Beneficial effects: By arranging the heating device in the box body of the battery pack, uniform heating and temperature control of the battery pack are achieved. This design not only improves the performance and safety of the battery pack, but also makes the use of the battery pack in low temperature environment more reliable and stable.

[0027] In an optional embodiment, the box body comprises an inner beam connected to the inner wall of the box body, and a through slot is arranged on the inner beam. The base of the box body is provided with a clamping slot, and the clamping slot is clamped with the through slot.

[0028] Beneficial effects: The design of the inner beam and the through slot enables the box body of the heating device to be conveniently fixed in the box body, and ensures the stability and reliability of the heating device in the battery pack. At the same time, this design also facilitates the maintenance and replacement of the heating device, and reduces the overall maintenance cost of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 A structure diagram of a heating device according to an embodiment of the present application;

[0031] Figure 2 A structure diagram of a box body according to an embodiment of the present application;

[0032] Figure 3 A structure diagram of a top cover according to an embodiment of the present application;

[0033] Figure 4 A structure diagram of a heating wire according to an embodiment of the present application;

[0034] Figure 5 A structure diagram of a base according to an embodiment of the present application;

[0035] Figure 6 A structure diagram of a box body according to an embodiment of the present application;

[0036] Figure 7 A structure diagram of a cold plate according to an embodiment of the present application;

[0037] Figure 8It is a structure schematic view of the upper plate in the embodiment of the present application.

[0038] Figure 9 It is a structure schematic view of the lower plate in the embodiment of the present application.

[0039] Legend of reference signs:

[0040] 1, heating wire; 11, heating core; 12, insulation layer; 13, protective sleeve; 2, box body; 21, first shunt hole; 22, second shunt hole; 23, water inlet hole; 24, base; 25, first sink; 26, top cover; 27, second sink; 28, clamping groove; 3, cold plate; 31, water outlet cavity; 32, water inlet cavity; 33, first shunt cavity; 34, second shunt cavity; 35, lower plate; 36, upper plate; 37, first through hole; 38, second through hole; 39, third through hole; 4, water inlet pipe; 5, water outlet pipe; 6, outlet seat; 7, box body; 8, inner beam; 81, through groove. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] The embodiments of the present application will be described below in combination with Figures 1 to 9 .

[0043] According to the embodiments of the present application, on the one hand, a heating device is provided, which comprises a heating wire 1, a box body 2 and a cold plate 3.

[0044] The box body 2 is provided with a heating cavity, the heating wire 1 is arranged in the heating cavity, and the heating cavity is provided with a water inlet hole 23 and at least two shunt holes. The cold plate 3 comprises a water outlet cavity 31, a water inlet cavity 32 and at least two shunt cavities, the shunt cavities are all in communication with the water outlet cavity 31, the water inlet cavity 32 is in communication with the water inlet hole 23 of the heating cavity, and the shunt cavities are arranged in one-to-one correspondence with and in communication with the shunt holes of the heating cavity.

[0045] It can be understood that the cooling liquid enters the water inlet cavity 32 and enters the heating cavity, so that the cooling liquid can be heated by the heating wire 1 in the heating cavity, after heating, the cooling liquid enters the distribution cavity, and flows through each area of the cold plate 3 to heat the battery cell, and finally flows out from the water outlet cavity 31, and the cooling liquid is circulated back to the water inlet cavity 32 through the water pump. Alternatively, the water inlet and outlet modes can be exchanged, that is, the water inlet and outlet sequence of the water outlet cavity 31 and the water inlet cavity 32 can be exchanged, and both can realize simultaneous heating of the battery cells on both sides of the battery pack, effectively avoiding the problem of excessive temperature difference of the whole battery pack caused by the high temperature of the inlet battery cell and the low temperature of the outlet battery cell due to the flow of the cooling liquid from one side to the other side.

[0046] It should be noted that the heating wire 1 can be directly in contact with the cooling liquid, and the heat exchange efficiency is high and the heating rate is fast.

[0047] In this embodiment, the heating device can make the cooling liquid entering the water inlet cavity 32 of the cold plate 3 first enter the heating cavity of the box body 2 for heating, and then the heated cooling liquid enters the distribution cavity to heat the battery, which not only realizes effective heating of the cooling liquid, but also ensures uniform distribution of the cooling liquid in the battery pack through the design of the distribution cavity. This design avoids the problem of local overheating or uneven temperature that may occur in traditional heating methods, thereby improving the performance and life of the battery pack. In addition, the structure of the device is simple, easy to manufacture and maintain, and reduces the production cost. It is particularly noted that the heating device in the present application can cool the battery through the cooling liquid by not supplying power to the heating wire.

[0048] In some embodiments, the cold plate 3 includes a first distribution cavity 33 and a second distribution cavity 34. The box body 2 includes a base 24, and the base is provided with a first sink 25, the bottom of the first sink 25 is provided with a first distribution hole 21, a second distribution hole 22 and a water inlet hole 23, and the first distribution hole 21 and the second distribution hole 22 are respectively located on both sides of the water inlet hole 23, the first distribution cavity 33 communicates with the first distribution hole 21, the second distribution cavity 34 communicates with the second distribution hole 22, and the heating wire 1 is at least partially arranged in the first sink 25.

[0049] Alternatively, the first distribution cavity 33 and the second distribution cavity 34 can be provided in the form of a coil pipe, which can increase the cooling area.

[0050] Alternatively, the first distribution cavity 33 and the second distribution cavity 34 can be arranged on both sides of the cold plate 3, which can realize synchronous heating or cooling of the battery pack on both sides.

[0051] It can be understood that the cooling liquid enters the water inlet cavity 32 and enters the heating cavity, so that the cooling liquid can be heated by the heating wire 1 in the heating cavity, after heating, the cooling liquid enters the first and second distribution cavities 33 and 34 respectively, flows through each area of the cold plate 3 to heat the battery cell, and finally flows out from the water outlet cavity 31. The cooling liquid is circulated by the water pump back to the water inlet cavity 32.

[0052] In this embodiment, by providing two distribution cavities and locating the two distribution holes on the two sides of the water inlet hole 23, the flow efficiency and heating effect of the cooling liquid are further improved.

[0053] In one embodiment, the box body 2 further comprises a top cover 26, the top cover 26 is provided with a second recess 27, and the top cover 26 is detachably connected with the base 24, so that the first recess 25 and the second recess 27 form the heating cavity.

[0054] Optionally, the connection mode of the top cover 26 and the base 24 can be reliable connection such as gluing, bolt connection or clamping, so as to ensure the sealing performance and overall structural strength.

[0055] In this embodiment, the detachable connection design of the base 24 and the top cover 26 facilitates cleaning of the heating cavity and replacement and maintenance of the heating wire 1, ensures long-term stable operation of the heating device, and by making the first recess 25 and the second recess 27 jointly form the heating cavity, the heating wire is only partially located in the first recess 25, which facilitates the removal of the heating wire 1.

[0056] In some embodiments, the cold plate 3 further comprises a lower plate 35 and an upper plate 36.

[0057] The lower plate 35 is provided with a water inlet groove, a first distribution groove, a second distribution groove and a water outlet groove on the surface, and the first distribution groove and the second distribution groove are in communication with the water outlet groove.

[0058] The upper plate 36 is connected with the lower plate 35 and closes the groove openings of the water inlet groove, the first distribution groove, the second distribution groove and the water outlet groove, and forms the water inlet cavity 32, the first distribution cavity 33, the second distribution cavity 34 and the water outlet cavity 31 respectively.

[0059] In this embodiment, the combined design of the lower plate 35 and the upper plate 36 not only simplifies the manufacturing process of the cold plate 3, but also improves the overall strength and durability of the cold plate 3. The reasonable arrangement of the water inlet groove, the first distribution groove, the second distribution groove and the water outlet groove ensures the uniform flow and effective heating of the cooling liquid inside the cold plate 3.

[0060] In some embodiments, the upper plate 36 is provided with a first through hole 37, a second through hole 38 and a third through hole 39, the first through hole 37 communicates the first distribution cavity 33 with the first distribution hole 21, the second through hole 38 communicates the second distribution cavity 34 with the second distribution hole 22, and the third through hole 39 communicates the water inlet cavity 32 with the water inlet hole 23.

[0061] In the embodiment, the first through hole 37, the second through hole 38 and the third through hole 39 are arranged to ensure the smooth flow of the cooling liquid inside the cold plate 3 and the effective connection with the heating cavity. This design not only improves the heating efficiency of the heating device, but also avoids the problems of uneven heating or poor heating effect caused by poor flow of the cooling liquid.

[0062] In some embodiments, the water inlet groove, the first diversion groove, the second diversion groove and the water outlet groove are formed by stamping the lower plate 35, and the first diversion groove and the second diversion groove are symmetrically arranged on both sides of the lower plate 35.

[0063] In the embodiment, the water inlet groove, the first diversion groove, the second diversion groove and the water outlet groove are formed by stamping the lower plate 35, which not only improves the integrity and stability of the cold plate 3, but also avoids the problems of cooling liquid leakage or poor heating effect caused by the connection between components. In addition, this design also makes the manufacturing process of the cold plate 3 more simple and efficient. The design of two symmetric diversion grooves helps to improve the uniformity of heating.

[0064] In some embodiments, the heating wire 1 is spirally arranged along a first direction, and the heating cavity is arranged in a long strip structure, and the first direction is the same as the length direction of the heating cavity. The heating wire 1 includes a heating core 11, an insulating layer 12 and a protective sleeve 13, and the insulating layer 12 is arranged on the outer circumferential surface of the heating core 11. The protective sleeve 13 is arranged on the outer circumferential surface of the insulating layer 12.

[0065] Optionally, the heating core 11 is a metal material and can generate heat after being electrified. The protective sleeve 13 is preferably a metal material to ensure the strength of the shell structure. The insulating layer 12 can effectively prevent short circuit of the heating core 11 and the protective sleeve 13.

[0066] In the embodiment, the spiral arrangement of the heating wire 1 not only improves the heating efficiency, but also makes the heating wire 1 more uniformly distributed in the heating cavity. The arrangement of the insulating layer 12 and the protective sleeve 13 ensures the safety and stability of the heating wire 1 during heating, avoiding potential safety hazards caused by overheating or short circuit. In addition, the material selection of the heating wire 1 also fully considers the balance between heating efficiency and energy consumption.

[0067] In some embodiments, the water inlet pipe 4 and the water outlet pipe 5 are further included, the water inlet pipe 4 communicates with the water inlet cavity 32, and the water outlet pipe 5 communicates with the water outlet cavity 31.

[0068] Optionally, two through holes are arranged on the upper plate and communicate with the water inlet cavity 32 and the water outlet cavity 31 respectively, and the water inlet pipe 4 and the water outlet pipe 5 communicate with the two through holes respectively, thereby realizing the communication between the water inlet pipe 4 and the water inlet cavity 32 and the communication between the water outlet pipe 5 and the water outlet cavity 31.

[0069] In this embodiment, the water inlet pipe 4 and the water outlet pipe 5 are arranged to facilitate the entry and exit of the cooling liquid into and out of the heating device, thereby achieving continuous heating of the battery pack. This design not only improves the heating efficiency of the heating device, but also makes the heating process more controllable and stable.

[0070] In some embodiments, two wire outlets 6 are further included, and are arranged at both ends of the top cover 26. The two ends of the heating wire 1 are respectively connected to the two wire outlets 6.

[0071] Alternatively, the two ends of the heating wire 1 are respectively connected to the two wire outlets 6, and one of the wire outlets 6 is connected to one pole of the high-voltage system of the battery pack, and the other wire outlet 6 is connected to the other pole of the high-voltage system of the battery pack, forming a conduction loop, and the power supply heating is controlled by the high-voltage system of the battery pack.

[0072] In this embodiment, the arrangement of the wire outlet 6 facilitates the connection of the heating wire 1 to the power supply, and ensures the stability and reliability of the heating wire 1 during the heating process. At the same time, the position and number of the wire outlet 6 also fully consider the actual use requirements and installation convenience of the heating device.

[0073] It should be noted that when the vehicle needs to heat the battery core at low temperature, the cooling liquid enters the water inlet pipe 4 into the water inlet cavity 32, passes through the water inlet hole 23 to the heating cavity, so that the cooling liquid in the heating cavity can be heated by the heating wire 1. After heating, the cooling liquid enters the first and second flow distribution cavities 33 and 34 through the first and second flow distribution holes 21 and 22, respectively, flows through the various regions of the cold plate 3 to heat the battery core, and finally flows out from the water outlet cavity 31 and returns to the water inlet pipe 4 through the water pump to form a circulation.

[0074] According to the embodiments of the present application, on the other hand, a battery pack is also provided, which comprises a box body 7 and a heating device.

[0075] The box body 7 is arranged as a frame structure with two opposite open sides. The cold plate 3 of the heating device is attached to one of the open sides of the box body 7, and the box body 2 of the heating device is arranged in the box body 7.

[0076] Alternatively, the material of the box body 2 can be metal or non-metal, and the connection between the cold plate 3 and the box body 7 can be welding, gluing, bolt connection or pressure bonding, etc. to ensure the sealing and overall structural strength.

[0077] In this embodiment, by arranging the heating device in the box body 7 of the battery pack, uniform heating and temperature control of the battery pack are achieved. This design not only improves the performance and safety of the battery pack, but also makes the use of the battery pack in low temperature environment more reliable and stable.

[0078] In some embodiments, the box 7 comprises an inner beam 8 connected to the inner wall of the box 7, and the inner beam 8 is provided with a through slot 81, and the base 24 of the box body 2 is provided with a clamping slot 28 which is clamped with the through slot 81.

[0079] In the embodiment, the design of the inner beam 8 and the through slot 81 makes the box body 2 of the heating device conveniently fixed in the box 7, and ensures the stability and reliability of the heating device in the battery pack. At the same time, this design also facilitates the maintenance and replacement of the heating device, and reduces the overall maintenance cost of the battery pack.

[0080] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A heating device, characterized in that, Comprise: A heating wire (1); A box body (2) provided with a heating cavity, the heating wire (1) is arranged in the heating cavity, and the heating cavity is provided with a water inlet hole (23) and at least two shunt holes; A cold plate (3) comprising a water outlet cavity (31), a water inlet cavity (32) and at least two shunt cavities, the shunt cavities are communicated with the water outlet cavity (31), the water inlet cavity (32) is communicated with the water inlet hole (23) of the heating cavity, and the shunt cavities are correspondingly arranged and communicated with the shunt holes of the heating cavity.

2. The heating device of claim 1, wherein The cold plate (3) comprises a first shunt cavity (33) and a second shunt cavity (34); the box body (2) comprises a base (24), the base is provided with a first sink (25), the bottom of the first sink (25) is provided with a first shunt hole (21), a second shunt hole (22) and the water inlet hole (23), and the first shunt hole (21) and the second shunt hole (22) are respectively located on both sides of the water inlet hole (23), the first shunt cavity (33) is communicated with the first shunt hole (21), the second shunt cavity (34) is communicated with the second shunt hole (22), and the heating wire (1) is at least partially arranged in the first sink (25).

3. The heating device of claim 2, wherein, The box body (2) further comprises: A top cover (26) provided with a second sink (27), the top cover (26) is detachably connected with the base (24), so that the first sink (25) and the second sink (27) constitute the heating cavity.

4. The heating device of claim 2, wherein, The cold plate (3) further comprises: A lower plate (35) provided with a water inlet groove, a first shunt groove, a second shunt groove and a water outlet groove on the surface, and the first shunt groove and the second shunt groove are communicated with the water outlet groove; An upper plate (36) connected with the lower plate (35) and closing the groove openings of the water inlet groove, the first shunt groove, the second shunt groove and the water outlet groove, respectively constituting the water inlet cavity (32), the first shunt cavity (33), the second shunt cavity (34) and the water outlet cavity (31).

5. The heating device of claim 4, wherein, The upper plate (36) is provided with a first through hole (37), a second through hole (38) and a third through hole (39), the first through hole (37) communicates the first shunt cavity (33) with the first shunt hole (21), the second through hole (38) communicates the second shunt cavity (34) with the second shunt hole (22), and the third through hole (39) communicates the water inlet cavity (32) with the water inlet hole (23).

6. The heating device of claim 4, wherein, The water inlet groove, the first shunt groove, the second shunt groove and the water outlet groove are formed by punching the lower plate (35), and the first shunt groove and the second shunt groove are symmetrically arranged on both sides of the lower plate (35).

7. The heating device of claim 1, wherein The heating wire (1) is spirally arranged along a first direction, and the first direction is the same as the length direction of the heating cavity.

8. The heating device of claim 1, wherein, The heating wire (1) comprises: A heating core (11); An insulating layer (12) arranged on the outer circumferential surface of the heating core (11); A protective sleeve (13) arranged on the outer circumferential surface of the insulating layer (12).

9. A battery pack, characterized by, Comprise: The box (7) is arranged as a frame structure with two opposite open sides; The heating device of any one of claims 1 to 8, wherein a cold plate (3) of the heating device is attached to one of the open sides of the box (7), and a box body (2) of the heating device is arranged in the box (7).

10. The battery pack of claim 9, wherein, The box (7) comprises: An inner beam (8) connected to an inner wall of the box (7), wherein a through slot (81) is arranged on the inner beam (8), and a base (24) of the box body (2) is provided with a clamping slot (28) which is clamped with the through slot (81).

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