Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a partition plate, a first heat exchange structure and a plurality of battery monomers. The battery comprises an explosion-proof valve. The partition plate divides the space in the battery pack into a battery compartment and a smoke exhaust compartment. The plurality of battery monomers are located in the battery compartment and are fixed to the partition plate. The explosion-proof valve faces the smoke exhaust compartment. The partition plate is provided with a smoke exhaust opening in communication with the smoke exhaust compartment. The partition plate is provided with an upper surface facing the battery monomers. The partition plate is provided with a recessed groove recessed from the upper surface. The first heat exchange structure is located in the recessed groove. The first heat exchange structure comprises a flow channel for the cooling medium to flow through to exchange heat with the battery monomers. The provision of the partition plate increases the strength of the battery pack. Meanwhile, the first heat exchange structure is located in the recessed groove, the heat dissipated by the partition plate to the external environment is small, the heat loss is small, and the heat exchange efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of battery cells, and more particularly to battery packs and electrical devices. Background Technology

[0002] In existing battery packs, the liquid cooling plate is located below the individual battery cells to absorb the heat generated by those cells. However, due to the flow channel design, the liquid cooling plate typically has relatively low strength, which is detrimental to the overall rigidity and strength of the battery pack. Utility Model Content

[0003] This application provides a battery pack and power supply device with better strength.

[0004] This application provides a battery pack, including: a separator, a first heat exchange structure, and a plurality of battery cells. The battery includes an explosion-proof valve. The separator divides the space inside the battery pack into a battery compartment and a smoke exhaust compartment. The plurality of battery cells are located in the battery compartment and are all fixed to the separator. The explosion-proof valve faces the smoke exhaust compartment. The separator has a smoke exhaust port communicating with the smoke exhaust compartment. The separator has an upper surface facing the battery cells. The separator has a recessed groove recessed from the upper surface. The first heat exchange structure is located in the recessed groove. The first heat exchange structure includes a flow channel for a cooling medium to flow through for heat exchange with the battery cells.

[0005] Furthermore, along the length of the battery cell, the separator corresponds to a heat dissipation area, an adhesive area, and a smoke exhaust area for each battery. The separator is bonded and fixed to the battery cell in the adhesive area. The adhesive area is located between the heat dissipation area and the smoke exhaust area. The recessed groove is located in the heat dissipation area, and the smoke exhaust port is located in the smoke exhaust area.

[0006] Furthermore, both ends of the battery cell are provided with a core current collector. Along the length of the battery cell, the separator corresponds to one battery and includes a pair of heat dissipation areas and a pair of bonding areas. The two sides of the smoke exhaust area are a pair of bonding areas, and the pair of bonding areas are located between the pair of heat dissipation areas. The heat dissipation areas are correspondingly arranged with the core current collector.

[0007] Furthermore, the bottom of the first heat exchange structure is bonded and fixed to the inner wall of the recessed groove; or,

[0008] A filling structure is provided between the bottom of the first heat exchange structure and the inner wall of the recessed groove, and the thermal conductivity of the filling structure is less than that of the first heat exchange structure; or,

[0009] A plurality of filling structures are provided between the bottom of the first heat exchange structure and the inner wall of the recessed groove. These multiple filling structures are spaced apart, and the thermal conductivity of each filling structure is less than that of the first heat exchange structure; or,

[0010] A gap, which is an air layer, is provided between the bottom of the first heat exchange structure and the inner wall of the recessed groove; or,

[0011] The bottom of the first heat exchange structure is pressed against the inner wall of the recessed groove.

[0012] Furthermore, both the separator and the first heat exchange structure are bonded and fixed to the battery cell. The top of the first heat exchange structure is higher than the upper surface of the separator, and the thickness of the adhesive between the first heat exchange structure and the battery cell is less than the thickness of the adhesive between the upper surface of the separator and the battery cell; or,

[0013] The top of the first heat exchange structure is lower than the upper surface of the separator, and the thickness of the adhesive between the first heat exchange structure and the battery cell is greater than the thickness of the adhesive between the upper surface of the separator and the battery cell; or,

[0014] The top of the first heat exchange structure is flush with the upper surface of the separator, and the thickness of the adhesive between the first heat exchange structure and the battery cell is equal to the thickness of the adhesive between the upper surface of the separator and the battery cell; or,

[0015] The separator is bonded and fixed to the battery cell, and the first heat exchange structure is in direct contact with the battery cell.

[0016] Furthermore, the strength of the partition is greater than the strength of the first heat exchange structure; and / or,

[0017] The thermal conductivity of the partition is less than that of the first heat exchange structure.

[0018] Furthermore, the battery includes a bottom surface facing the separator and a side surface perpendicular to the bottom surface, and the battery pack includes a plurality of second heat exchange structures located between the sides of two adjacent battery cells; or,

[0019] The battery includes a bottom surface facing the separator and a side surface perpendicular to the bottom surface. The battery pack includes multiple heat insulation elements located between the sides of two adjacent battery cells; or

[0020] The battery pack includes multiple heat insulation components and multiple second heat exchange structures. A portion of the second heat exchange structures are provided between the sides of two adjacent battery cells, while another portion of the heat insulation components are provided between the sides of two adjacent battery cells.

[0021] Furthermore, the battery pack includes a third heat exchange structure, which is disposed opposite to the separator.

[0022] Furthermore, the battery pack includes a bottom protective plate and a top cover assembly, the bottom protective plate and the top cover assembly forming a receiving cavity, and the partition is located in the receiving cavity to divide the receiving cavity into the battery compartment and the smoke exhaust compartment.

[0023] Furthermore, the upper cover assembly includes an upper cover; or,

[0024] The upper cover assembly includes an upper cover, a fourth heat exchange structure, and thermally conductive adhesive, wherein the battery cell, the thermally conductive adhesive, the fourth heat exchange structure, and the upper cover are arranged sequentially; or,

[0025] The upper cover assembly includes an upper cover, a fourth heat exchange structure, thermally conductive adhesive, and a thermal insulation structure, wherein the battery cell, the thermally conductive adhesive, the fourth heat exchange structure, the thermal insulation structure, and the upper cover are arranged sequentially; or,

[0026] The top cover assembly includes a fourth heat exchange structure, thermally conductive adhesive, and a thermal insulation structure, wherein the battery cell, the thermally conductive adhesive, the fourth heat exchange structure, and the thermal insulation structure are arranged sequentially.

[0027] This application also provides an electrical device including the battery pack.

[0028] The battery pack according to this application includes a separator, a first heat exchange structure, and multiple battery cells. The multiple battery cells are fixed to the separator. The separator has a recessed groove on its upper surface. The first heat exchange structure is located within the recessed groove and includes a flow channel for a cooling medium to flow through for heat exchange with the battery cells. The separator increases the strength of the battery pack; at the same time, the first heat exchange structure, located within the recessed groove, loses less heat to the external environment, thus improving heat exchange efficiency. Attached Figure Description

[0029] Figure 1 This is a cross-sectional schematic diagram of the battery pack of this application;

[0030] Figure 2 yes Figure 1 A partially enlarged view of the cross-sectional schematic diagram shown;

[0031] Figure 3 yes Figure 1 The diagram shows a cross-sectional view of the first embodiment after the heat exchange structure and partition are assembled, wherein only a part of the heat exchange structure and partition is shown;

[0032] Figure 4 yes Figure 1The diagram shows a cross-sectional view of the second embodiment after the heat exchange structure and partition are assembled, wherein only a part of the heat exchange structure and partition is shown;

[0033] Figure 5 yes Figure 1 The diagram shows a cross-sectional view of the third embodiment after the heat exchange structure and partition are assembled, wherein only a part of the heat exchange structure and partition is shown;

[0034] Figure 6 yes Figure 1 The diagram shows a cross-sectional view of the fourth embodiment after the heat exchange structure and partition are assembled, where only a part of the heat exchange structure and partition is shown.

[0035] Figure 7 yes Figure 1 The diagram shows a cross-sectional view of the fifth embodiment after the heat exchange structure and partition are assembled, where only a part of the heat exchange structure and partition is shown;

[0036] Figure 8 yes Figure 1 A schematic diagram of the sixth embodiment showing the assembly of the separator, multiple battery cells and multiple second heat exchange structures;

[0037] Figure 9 yes Figure 1 A schematic diagram of the seventh embodiment showing the assembly of the separator, the third heat exchange structure, multiple battery cells and multiple second heat exchange structures;

[0038] Figure 10 yes Figure 1 A schematic diagram of the eighth embodiment showing the assembly of the separator, multiple battery cells, multiple second heat exchange structures and multiple heat insulation components;

[0039] Figure 11 yes Figure 1 A schematic diagram of the ninth embodiment showing the assembly of the separator, the third heat exchange structure, multiple battery cells, multiple second heat exchange structures, and multiple heat insulation components.

[0040] Figure 12 yes Figure 11 A schematic diagram of multiple second heat exchange structures connected in parallel in the battery pack shown.

[0041] Figure 13 yes Figure 1 A cross-sectional schematic diagram of the tenth embodiment of the battery pack shown;

[0042] Figure 14 yes Figure 13 A partially enlarged view of the cross-sectional schematic diagram shown;

[0043] Figure 15 yes Figure 1Partial enlarged view of a cross-sectional schematic diagram of the eleventh embodiment of the battery pack shown;

[0044] Figure 16 is Figure 1 Partial enlarged view of a cross-sectional schematic diagram of the twelfth embodiment of the battery pack shown.

[0045] Explanation of reference numerals in the drawings: Battery pack, 100; Partition board, 1; Smoke exhaust port, 11; Upper surface, 12; Concave groove, 121; Heat dissipation area, 13; Bonding area, 14; Smoke exhaust area, 15; First heat exchange structure, 2; Battery cell, 3; Adhesive, 30; Explosion-proof valve, 31; Bottom surface, 32; Side surface, 33; Bottom guard plate, 4; Receiving cavity, 41; Battery compartment, 411; Smoke exhaust compartment, 412; Upper cover, 5; Filling structure, 6; Second heat exchange structure, 71; Third heat exchange structure, 72; Heat insulation member, 8; Upper cover assembly, 9; Fourth heat exchange structure, 92; Thermal conductive adhesive, 93; Thermal insulation structure, 94. Specific embodiments

[0046] Here, the technical solutions in the embodiments of the present application (or "embodiments") will be clearly and completely described in conjunction with the accompanying drawings. When the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0047] If there are terms related to directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), then such terms are only used to explain the relative positional relationships and movement conditions between components in a specific posture (as shown in the accompanying drawings); if this specific posture changes, then the directional indication or positional relationship also changes accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only for the purpose of convenient description and cannot be understood as indicating or implying relative importance.

[0048] Refer Figures 1 to 2 , the embodiments of the present application provide a battery pack 100, including a partition board 1, a first heat exchange structure 2 and a plurality of battery cells 3. The plurality of battery cells 3 are all fixed to the partition board 1. The battery cell 3 includes an explosion-proof valve 31.

[0049] The partition board 1 divides the space inside the battery pack 100 into a battery compartment 411 and a smoke exhaust compartment 412. The plurality of battery cells 3 are located in the battery compartment 411 and are all fixed to the partition board 1. The explosion-proof valve 31 faces the smoke exhaust compartment 412. The partition board 1 is provided with a smoke exhaust port Il communicating with the smoke exhaust compartment 412. The smoke exhaust port 11 penetrates through the partition board 1 for the high-pressure gas generated inside the battery cell 3 to pass through.

[0050] The battery compartment 411 and the smoke exhaust compartment 412 are designed with separate chambers. When the explosion-proof valve 31 is opened, the high-pressure gas generated inside the battery cell 3 enters the smoke exhaust compartment 412 and will not enter the battery compartment 411, thereby improving safety.

[0051] In one embodiment, the battery pack 100 further includes a bottom protective plate 4 and a top cover 5. The bottom protective plate 4 and the top cover 5 form a receiving cavity 41. The partition 1 is located within the receiving cavity 41 to divide the receiving cavity 41 into the battery compartment 411 and the smoke exhaust compartment 412.

[0052] In one embodiment, the battery cell 3 includes a housing (not shown), a cover plate (not shown), and a winding core (not shown). The cover plate is fixed to the housing. The winding core is located within the space enclosed by the housing and the cover plate. The explosion-proof valve 31 is fixed to the housing.

[0053] The explosion-proof valve 31 is disposed on the housing, and the terminal of the battery cell 3 and the explosion-proof valve 31 are disposed on different surfaces to achieve thermoelectric separation and improve safety.

[0054] In one embodiment, the housing is generally rectangular, with an opening at the top or both ends. The cover plate is fixed to the housing to cover the openings, forming a sealed cavity to house the winding core and prevent external environmental influences on the core.

[0055] The cover plate and the housing can be fixed by welding or bonding.

[0056] In one embodiment, the housing is made of a metallic or composite material, such as aluminum, steel, carbon fiber, or glass fiber.

[0057] The separator 1 has an upper surface 12 facing the battery cell 3. The separator 1 has a recessed groove 121 recessed from the upper surface 12. The first heat exchange structure 2 is located in the recessed groove 121 and includes a flow channel (not shown) for a cooling medium to flow through for heat exchange with the battery cell 3.

[0058] The partition 1 increases the strength of the battery pack 100. Meanwhile, the first heat exchange structure 2 is located within the recessed groove 121, resulting in less heat loss to the external environment and improved heat exchange efficiency. Furthermore, it allows for the selection of materials that are easy to process or have better elongation and thermal conductivity for the heat exchange structure, while the partition 1 can be made of materials with higher strength, better rigidity, and lower thermal conductivity, thereby improving the rigidity of the battery pack 100 and reducing heat loss.

[0059] In one embodiment, the first heat exchange structure 2 includes a heat exchange tube through which a cooling medium flows. In another embodiment, the first heat exchange structure 2 is a heat exchange plate. This application does not limit the type of the first heat exchange structure 2.

[0060] In one embodiment, the strength of the separator 1 is greater than the strength of the first heat exchange structure 2, so as to increase the structural strength of the battery pack 100.

[0061] In one embodiment, the thermal conductivity of the partition 1 is less than that of the first heat exchange structure 2, so as to reduce heat loss and improve heat exchange efficiency.

[0062] In one embodiment, the strength of the partition 1 is greater than the strength of the first heat exchange structure 2, and the thermal conductivity of the partition 1 is less than the thermal conductivity of the first heat exchange structure 2.

[0063] Along the length of the battery cell 3, the separator 1 includes a heat dissipation area 13, an adhesive area 14, and a smoke exhaust area 15 corresponding to each battery cell 3. The separator 1 is bonded and fixed to the battery cell 3 in the adhesive area 14. The adhesive area 14 is located between the heat dissipation area 13 and the smoke exhaust area 15. The recessed groove 121 is located in the heat dissipation area 13, and the smoke exhaust port 11 is located in the smoke exhaust area 15.

[0064] Along the length of the battery cell 3, the separator 1 includes a pair of heat dissipation areas 13 and a pair of bonding areas 14 for each battery cell 3. The two sides of the smoke exhaust area 15 are a pair of bonding areas 14, and the pair of bonding areas 14 are located between the pair of heat dissipation areas 13.

[0065] In one embodiment, both ends of the battery cell 3 are provided with core current collectors (not shown), and the heat dissipation area 13 is correspondingly arranged with the core current collectors. Since a significant amount of heat is generated near the core current collectors, the first heat exchange structure 2 is close to them, thereby improving heat exchange efficiency and heat dissipation efficiency.

[0066] In one embodiment, the partition 1 includes a plurality of recessed grooves 121, which are arranged in parallel and may be connected end-to-end or disconnected. In another embodiment, the plurality of recessed grooves 121 may not be parallel.

[0067] In one embodiment, the first heat exchange structure 2 includes a heat exchange tube through which a cooling medium flows. In another embodiment, the first heat exchange structure 2 may also be a coolant located within the recessed groove 121 or any structure with heat exchange function.

[0068] Reference Figure 3 In one embodiment, a filling structure 6 is provided between the bottom of the first heat exchange structure 2 and the inner wall of the recessed groove 121. The filling structure 6 is made of a material with a low thermal conductivity to reduce heat loss. The thermal conductivity of the filling structure 6 is less than that of the first heat exchange structure 2. For example, it can be aerogel, foaming glue, structural glue, etc.

[0069] Reference Figure 4 In one embodiment, a plurality of filling structures 6 are provided between the bottom of the first heat exchange structure 2 and the inner wall of the recessed groove 121. The plurality of filling structures 6 are arranged at intervals. The filling structure 6 is made of a material with a low thermal conductivity to reduce heat loss. The thermal conductivity of the filling structure 6 is less than that of the first heat exchange structure 2. For example, it can be aerogel, foaming glue, structural glue, etc.

[0070] Reference Figure 5 In one embodiment, the bottom of the first heat exchange structure 2 is press-fitted on the inner wall of the recessed groove 121 to reduce heat loss. In another embodiment, a gap is provided between the bottom of the first heat exchange structure 2 and the inner wall of the recessed groove 121. The gap is an air layer to reduce heat loss.

[0071] In one embodiment, the bottom of the first heat exchange structure 2 is adhesively fixed to the inner wall to improve strength. The inner wall has a bottom wall corresponding to the bottom of the first heat exchange structure 2. The adhesive can cover the entire bottom wall or be partially laid on the bottom wall.

[0072] Reference Figures 5 to 7 In one embodiment, both the partition plate 1 and the first heat exchange structure 2 are adhesively fixed to the battery cell 3 through the adhesive 30.

[0073] In Figure 5 , the top of the first heat exchange structure 2 is flush with the upper surface 12 of the partition plate 1. The thickness of the adhesive between the first heat exchange structure 2 and the battery cell 3 is equal to the thickness of the adhesive between the upper surface 12 of the partition plate 1 and the battery cell 3 to improve flatness.

[0074] In Figure 6 , the top of the first heat exchange structure is higher than the upper surface 12 of the partition plate 1. The thickness of the adhesive between the first heat exchange structure 2 and the battery cell 3 is less than the thickness of the adhesive between the upper surface 12 of the partition plate 1 and the battery cell 3 to improve heat exchange efficiency.

[0075] In Figure 7Among them, the top of the first heat exchange structure 2 is lower than the upper surface 12 of the partition 1, and the thickness of the adhesive between the first heat exchange structure 2 and the battery cell 3 is greater than the thickness of the adhesive between the upper surface 12 of the partition 1 and the battery cell 3, so as to eliminate the stress during the assembly of the first heat exchange structure 2.

[0076] In another embodiment, the partition 1 is adhesively fixed to the battery cell 3, and the first heat exchange structure 2 is in direct contact with the battery cell 3 to improve the heat exchange efficiency.

[0077] Refer Figure 8 , in one embodiment, the battery cell 3 includes a bottom surface 32 facing the partition 1 and a side surface 33 perpendicular to the bottom surface 32. The battery pack 100 includes a plurality of second heat exchange structures 71, and the second heat exchange structures 71 are located between the side surfaces 33 of two adjacent battery cells 3 to absorb the heat generated by the battery cells 3.

[0078] In one embodiment, the second heat exchange structure 71 is a heat exchange plate. The present application does not limit the type of the second heat exchange structure 7.

[0079] Refer Figure 9 , in one embodiment, the battery pack 100 includes a plurality of heat insulation members 8, and the heat insulation members 8 are located between the side surfaces 33 of two adjacent battery cells 3. The heat insulation members 8 can prevent heat transfer between two adjacent battery cells 3 to reduce the risk of thermal runaway propagation, for example, they can be aerogel, foaming glue, structural glue, etc.

[0080] Refer Figure 10 , in one embodiment, the battery pack 100 includes a plurality of heat insulation members 8, the second heat exchange structure 71 is provided between the side surfaces 33 of a part of adjacent battery cells 3, and the heat insulation members 8 are provided between the side surfaces 33 of another part of adjacent battery cells 3.

[0081] Refer Figures 11 to 12 , in one embodiment, the battery pack 100 includes a third heat exchange structure 72, and the third heat exchange structure 72 is disposed opposite to the partition 1.

[0082] In one embodiment, the third heat exchange structure 72 is a heat exchange plate or a heat exchange tube. The present application does not limit the type of the third heat exchange structure 72.

[0083] In one embodiment, both the first heat exchange structure 2 and the third heat exchange structure 72 are heat exchange tubes for a heat dissipation medium to flow through, and the first heat exchange structure 2 is connected to the third heat exchange structure 72.

[0084] Any two or three of the first heat exchange structure 2, the second heat exchange structure 71, and the third heat exchange structure 72 can be combined in various ways such as in parallel, in series, independent of each other, or in a mixed independent combination; they can also be two different media, such as one being liquid cooling and the other being direct cooling.

[0085] Refer Figure 13 , in one embodiment, the battery pack 100 includes an upper cover assembly 9. The bottom guard plate 4 and the upper cover assembly 9 enclose the receiving cavity 41. The partition 1 is located within the receiving cavity 41. The receiving cavity 41 includes a battery compartment 411 located between the partition 1 and the upper cover assembly 9 and a smoke exhaust compartment 412 located between the partition 1 and the bottom guard plate 4. A plurality of the battery cells 3 are located within the battery compartment 411. The explosion-proof valve 31 faces the smoke exhaust compartment 412. The partition 1 is provided with a smoke exhaust port 11 corresponding to the explosion-proof valve 31. The smoke exhaust port 11 penetrates through the partition 1 to allow the high-pressure gas generated inside the battery cell 3 to pass through.

[0086] In one embodiment, the upper cover assembly 9 is the upper cover 5.

[0087] Refer Figure 14 , in one embodiment, the upper cover assembly 9 includes the upper cover 5, a fourth heat exchange structure 92, and a thermal conductive adhesive 93. The battery cell 3, the thermal conductive adhesive 93, the fourth heat exchange structure 92, and the upper cover 5 are arranged in sequence. The arrangement of the upper cover assembly 9 further improves the heat exchange efficiency to enhance the heat dissipation effect.

[0088] The upper cover 5 can be integrally provided with the fourth heat exchange structure 92 or can be provided in a split manner.

[0089] The fourth heat exchange structure 92 can be a heat exchange plate or the like.

[0090] Any two or three of the first heat exchange structure 2, the second heat exchange structure 71, and the fourth heat exchange structure 92 can be combined in various ways such as in parallel, in series, independent of each other, or in a mixed independent combination; they can also be two different media, such as one being liquid cooling and the other being direct cooling.

[0091] Refer Figure 15 , in one embodiment, the upper cover assembly 9 includes the upper cover 5, a fourth heat exchange structure 92, a thermal conductive adhesive 93, and a thermal insulation structure 94. The battery cell 3, the thermal conductive adhesive 93, the fourth heat exchange structure 92, the thermal insulation structure 94, and the upper cover 5 are arranged in sequence. The arrangement of the upper cover assembly 9 further improves the heat exchange efficiency to enhance the heat dissipation effect. In another embodiment, the thermal insulation structure 94 is an adhesive. The fourth heat exchange structure 92 can be a heat exchange plate or the like.

[0092] Refer Figure 16 In one embodiment, the upper cover assembly 9 does not include the upper cover 5. The upper cover assembly 9 includes a fourth heat exchange structure 92, thermally conductive adhesive 93, and a thermal insulation structure 94. The fourth heat exchange structure 92 is equivalent to the upper cover 5. The battery cell 3, the thermally conductive adhesive 93, the fourth heat exchange structure 92, and the thermal insulation structure 94 are arranged sequentially. The upper cover assembly 9 further improves heat exchange efficiency to enhance heat dissipation. In another embodiment, the thermal insulation structure 94 is a structural adhesive. The fourth heat exchange structure 92 may be a heat exchange plate, etc.

[0093] Structural adhesives are primarily used to connect and support high-strength structural components, such as metals, ceramics, plastics, rubber, and wood, offering higher strength and a longer service life. They feature high strength, corrosion resistance, and aging resistance, making them suitable for connections between components, surface protection of parts, and concrete bonding, especially in structural components that need to withstand significant loads. They can replace some traditional connection methods such as welding and riveting for component reinforcement, anchoring, repair, crack filling, and hole repair.

[0094] The battery pack 100 of this application is applicable to battery cells such as square-shell, short-blade, and multi-string cells. The positive and negative terminals of the battery cell 3 can face upwards, to the left, to the right, or both.

[0095] The explosion-proof valve 31 of the battery cell 3 can be centrally located or eccentrically arranged.

[0096] This application also provides an electrical device, including the battery pack 100. The electrical device includes, but is not limited to, a vehicle.

[0097] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery pack, characterized in that, include: Multiple battery cells, including explosion-proof valves; A partition divides the space inside the battery pack into a battery compartment and a smoke exhaust compartment. Multiple battery cells are located in the battery compartment and are all fixed to the partition. The explosion-proof valve faces the smoke exhaust compartment. The partition has a smoke exhaust port that communicates with the smoke exhaust compartment. The partition has an upper surface facing the battery cells. The partition has a recessed groove that is recessed from the upper surface. A first heat exchange structure is located within the recessed groove. The first heat exchange structure includes a flow channel through which a cooling medium flows to exchange heat with the battery cell.

2. The battery pack according to claim 1, characterized in that, Along the length of the battery cell, the separator includes a heat dissipation area, an adhesive area, and a smoke exhaust area for each battery cell. The separator is bonded and fixed to the battery cell in the adhesive area. The adhesive area is located between the heat dissipation area and the smoke exhaust area. The recessed groove is located in the heat dissipation area, and the smoke exhaust port is located in the smoke exhaust area.

3. The battery pack according to claim 2, characterized in that, Both ends of the battery cell are provided with a core current collector. Along the length of the battery cell, the separator includes a pair of heat dissipation areas and a pair of bonding areas for each battery cell. The two sides of the smoke exhaust area are a pair of bonding areas, and the pair of bonding areas are located between the pair of heat dissipation areas. The heat dissipation areas are correspondingly arranged with the core current collector.

4. The battery pack according to claim 1, characterized in that, The bottom of the first heat exchange structure is bonded and fixed to the inner wall of the recessed groove; or, A filling structure is provided between the bottom of the first heat exchange structure and the inner wall of the recessed groove, and the thermal conductivity of the filling structure is less than that of the first heat exchange structure. or, A plurality of filling structures are provided between the bottom of the first heat exchange structure and the inner wall of the recessed groove. These multiple filling structures are spaced apart, and the thermal conductivity of each filling structure is less than that of the first heat exchange structure; or, A gap, which is an air layer, is provided between the bottom of the first heat exchange structure and the inner wall of the recessed groove; or, The bottom of the first heat exchange structure is pressed against the inner wall of the recessed groove.

5. The battery pack according to claim 1, characterized in that, Both the separator and the first heat exchange structure are bonded and fixed to the battery cell. The top of the first heat exchange structure is higher than the upper surface of the separator, and the thickness of the adhesive between the first heat exchange structure and the battery cell is less than the thickness of the adhesive between the upper surface of the separator and the battery cell; or, The top of the first heat exchange structure is lower than the upper surface of the separator, and the thickness of the adhesive between the first heat exchange structure and the battery cell is greater than the thickness of the adhesive between the upper surface of the separator and the battery cell; or, The top of the first heat exchange structure is flush with the upper surface of the separator, and the thickness of the adhesive between the first heat exchange structure and the battery cell is equal to the thickness of the adhesive between the upper surface of the separator and the battery cell; or, The separator is bonded and fixed to the battery cell, and the first heat exchange structure is in direct contact with the battery cell.

6. The battery pack according to claim 1, characterized in that, The strength of the partition is greater than the strength of the first heat exchange structure; and / or, The thermal conductivity of the partition is less than that of the first heat exchange structure.

7. The battery pack according to claim 1, characterized in that, The battery cell includes a bottom surface facing the separator and a side surface perpendicular to the bottom surface; the battery pack includes a plurality of second heat exchange structures located between the sides of two adjacent battery cells; or, The battery cell includes a bottom surface facing the separator and a side surface perpendicular to the bottom surface. The battery pack includes multiple heat insulation elements located between the sides of two adjacent battery cells; or The battery pack includes multiple heat insulation components and multiple second heat exchange structures. A portion of the second heat exchange structures are provided between the sides of two adjacent battery cells, while another portion of the heat insulation components are provided between the sides of two adjacent battery cells.

8. The battery pack according to claim 1, characterized in that, The battery pack includes a third heat exchange structure, which is disposed opposite to the separator.

9. The battery pack according to any one of claims 1 to 8, characterized in that, The battery pack includes a bottom protective plate and a top cover assembly, which together form a receiving cavity. A partition is located within the receiving cavity to divide the receiving cavity into the battery compartment and the smoke exhaust compartment.

10. The battery pack according to claim 9, characterized in that, The upper cover assembly includes an upper cover; or, The upper cover assembly includes an upper cover, a fourth heat exchange structure, and thermally conductive adhesive, wherein the battery cell, the thermally conductive adhesive, the fourth heat exchange structure, and the upper cover are arranged sequentially; or, The upper cover assembly includes an upper cover, a fourth heat exchange structure, thermally conductive adhesive, and a thermal insulation structure, wherein the battery cell, the thermally conductive adhesive, the fourth heat exchange structure, the thermal insulation structure, and the upper cover are arranged sequentially; or, The top cover assembly includes a fourth heat exchange structure, thermally conductive adhesive, and a thermal insulation structure, wherein the battery cell, the thermally conductive adhesive, the fourth heat exchange structure, and the thermal insulation structure are arranged sequentially.

11. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 10.

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