Battery pack

Abstract

The utility model provides a battery pack, which comprises a box body, a battery compartment and an electrical compartment are formed in the box body, the battery compartment and the electrical compartment are adjacently arranged, a battery pack is arranged in the battery compartment, a power supply control element, a bottom plate and a box cover are arranged in the battery compartment, and the bottom plate and the box cover are respectively arranged at the bottom and the top of the box body; the cold plate is arranged between the battery pack and the bottom plate; the heat insulation structure is arranged between the battery pack and the box cover, and / or the heat insulation structure is arranged between the battery pack and the cold plate, and / or the heat insulation structure is arranged between the cold plate and the bottom plate, the heat insulation structure is parallel to the bottom plate or the box cover, and the maximum distance between the edge, facing the electrical bin, of the heat insulation structure and the electrical bin ranges from 2mm to 2000mm. The heat insulation structure is arranged at the position, close to the electrical bin, of the battery pack, so that high temperature generated in the electrical bin is isolated by the heat insulation structure, the high temperature generated in the electrical bin is not easily guided into a passenger compartment, and the comfort of passengers is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a battery pack. Background Art

[0002] The battery pack is a core component of new energy vehicles. The battery pack has a battery compartment and an electrical compartment. The electrical compartment is equipped with power control components and conductive bars. When the battery pack is working, the components in the electrical compartment generate heat, which forms a concentrated heat generation area in the electrical compartment with a high temperature. The high temperature generated by the electrical compartment is easily introduced into the passenger compartment, thereby reducing the comfort of the passengers and increasing the burden on the air conditioning system. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the high temperature generated by the electrical compartment of the battery pack is easily introduced into the passenger compartment, thereby providing a battery pack.

[0004] In order to solve the above problems, the utility model provides a battery pack, comprising: a box body, a battery compartment and an electrical compartment are formed in the box body, the battery compartment and the electrical compartment are arranged adjacent to each other, a battery pack is arranged in the battery compartment, a power control element is arranged in the battery compartment, and the high-voltage conductive bus of the battery pack is collected with the electrical compartment; a bottom plate and a box cover, respectively arranged at the bottom and top of the box body; a cold plate, arranged between the battery pack and the bottom plate; a heat insulation structure, the heat insulation structure is arranged between the battery pack and the box cover, and / or, the heat insulation structure is arranged between the battery pack and the cold plate, and / or, the heat insulation structure is arranged between the cold plate and the bottom plate, wherein the heat insulation structure is arranged parallel to the bottom plate or the box cover, and the maximum distance between the edge of the heat insulation structure facing the electrical compartment and the electrical compartment is in the range of 2mm to 2000mm.

[0005] Optionally, the battery pack further includes a first heat-conducting structure, which is disposed in a middle area of ​​the battery compartment, and the heat-insulating structure is disposed in a peripheral area of ​​the battery compartment.

[0006] Optionally, the thermal conductivity R1 of the first heat-conducting structure and the thermal conductivity R2 of the heat-insulating structure satisfy the following relationship: R1>thermal conductivity of air>R2.

[0007] Optionally, the thermal conductivity R2 of the thermal insulation structure is less than or equal to 0.02 W / (m·K).

[0008] Optionally, the first heat-conducting structure is disposed between the battery pack and the box cover, and the first heat-conducting structure is in contact with the box cover, and the heat-insulating structure is disposed between the battery pack and the box cover, and the heat-insulating structure is in contact with the box cover.

[0009] Optionally, the heat insulation structure is respectively arranged at the four corners of the battery pack.

[0010] Optionally, the battery pack also includes a second heat-conducting structure, which is arranged at the bottom of the battery pack. The second heat-conducting structure has notches corresponding to the corners of the battery pack. The heat-insulating structure is arranged at the bottom of the battery pack, and the heat-insulating structure is located in the notch of the second heat-conducting structure.

[0011] Optionally, the battery pack also includes a water cooling system, which includes a water inlet and a water outlet. On a reference plane parallel to the base plate, the projection of the insulation structure at least partially overlaps with the projection of the water inlet, and / or the projection of the insulation structure at least partially overlaps with the projection of the water outlet.

[0012] Optionally, the thickness of the thermal insulation structure is greater than or equal to 4 mm.

[0013] Optionally, the projection area of ​​the first heat-conducting structure on the surface of the battery pack is S1, the area of ​​the surface of the battery pack facing the first heat-conducting structure is S2, and S1 and S2 satisfy the following relationship: 0.05≤S1 / S2≤0.5.

[0014] Optionally, the battery pack includes a plurality of batteries, and the end surface of the battery facing the box cover is provided with a pole and an explosion-proof valve.

[0015] The utility model has the following advantages:

[0016] By using the technical solution of the utility model, a heat insulation structure is arranged at a position close to the battery pack and the electrical compartment, so that the high temperature generated in the electrical compartment is isolated by the heat insulation structure, and the high temperature generated in the electrical compartment is not easily introduced into the passenger compartment, thereby improving the comfort of the passengers. Therefore, the technical solution of the utility model solves the defect in the prior art that the high temperature generated in the electrical compartment of the battery pack is easily introduced into the passenger compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram showing the structure of the battery pack of the present invention from a bottom perspective;

[0019] Figure 2 Shows Figure 1 Schematic diagram of the bottom structure of the battery pack (the bottom plate is not shown);

[0020] Figure 3 Shows Figure 1 Schematic diagram of the top structure of the battery pack (the box cover is not shown);

[0021] Figure 4 Shows Figure 1 Schematic diagram of the distribution of the first heat-conducting structure, the second heat-conducting structure and the heat-insulating structure of the battery pack (other structures are omitted);

[0022] Figure 5 Shows Figure 1 The surface temperature cloud diagram of the battery pack when the battery pack is working.

[0023] Description of reference numerals:

[0024] 10. Box body; 11. Battery compartment; 12. Electrical compartment; 20. Battery pack; 21. Battery; 30. Bottom plate; 40. Heat insulation structure; 50. First heat-conducting structure; 60. Second heat-conducting structure; 61. Notch. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] like Figures 1 to 3 As shown, an embodiment of a battery pack according to the present application includes a box body 10, a bottom plate 30, a box cover and a heat insulation structure 40. A battery compartment 11 and an electrical compartment 12 are formed in the box body, and a battery pack 20 is arranged in the battery compartment 11. The bottom plate 30 and the box cover are respectively arranged at the bottom and top of the box body 10. The heat insulation structure 40 is arranged between the battery pack 20 and the box cover, and / or the heat insulation structure 40 is arranged between the battery pack 20 and the bottom plate 30. Furthermore, the maximum distance between the heat insulation structure 40 and the electrical compartment 12 is in the range of 2 mm to 2000 mm.

[0030] By using the technical solution of this embodiment, by arranging the heat insulation structure 40 at a position close to the electric compartment 12 of the battery pack, the high temperature generated in the electric compartment 12 is isolated by the heat insulation structure 40, and the high temperature generated in the electric compartment 12 is not easily introduced into the passenger compartment, thereby improving the comfort of the passengers. Therefore, the technical solution of this embodiment solves the defect in the prior art that the high temperature generated in the electric compartment of the battery pack is easily introduced into the passenger compartment.

[0031] Furthermore, the aforementioned maximum distance between the heat insulation structure 40 and the electrical compartment 12 refers to the maximum distance between the edge of the heat insulation structure 40 facing the electrical compartment 12 and the electrical compartment.

[0032] like Figure 2 and Figure 3 As shown, the box 10 is divided into two areas, one of which is the battery compartment 11 and the other is the electrical compartment 12, and the battery compartment 11 and the electrical compartment 12 are arranged adjacent to each other. A battery pack 20 is arranged in the battery compartment 11, and the battery pack 20 is formed by arranging a plurality of batteries 21. A power control element is arranged in the electrical compartment 12, and the high-voltage conductive bus connected to the battery pack 20 is collected in the electrical compartment 12, so when the battery pack is working, the electrical compartment 12 will generate concentrated heat.

[0033] from Figure 2 It can be seen that the battery compartment 11 is square in shape and occupies most of the space in the box body 10 , and the electrical compartment 12 is roughly trapezoidal in structure and occupies a smaller space in the box body 10 .

[0034] Furthermore, the bottom plate 30 (or called bottom guard plate) is arranged at the bottom of the box body 10 , and the box cover (not shown in the figure) is arranged at the top position of the box body 10 , so that a closed space is formed in the box body 10 .

[0035] Optionally, the position of the heat insulating structure 40 is set to a maximum distance from the electrical compartment 12 in the range of 2 mm to 2000 mm. This arrangement allows the heat insulating structure 40 to be as close to the electrical compartment 12 as possible, so that the heat generated by the electrical compartment 12 when the battery pack is working can be isolated by the heat insulating structure 40.

[0036] Furthermore, in this embodiment, the heat insulation structure 40 is disposed at the bottom of the battery pack 20 , that is, the heat insulation structure 40 is disposed between the battery pack 20 and the bottom plate 30 .

[0037] In some embodiments not shown, the heat insulation structure 40 may also be disposed at the top of the battery pack 20 , that is, the heat insulation structure 40 may also be disposed between the battery pack 20 and the box cover.

[0038] In some embodiments not shown, a heat insulation structure 40 may be provided at both the bottom and the top of the battery pack 20. That is, a heat insulation structure 40 is provided between the battery pack 20 and the bottom plate 30, and a heat insulation structure 40 is also provided between the battery pack 20 and the box cover.

[0039] Furthermore, the battery pack further includes a cold plate, which is disposed between the battery pack 20 and the bottom plate 30 , and the heat insulation structure 40 is disposed between the battery pack 20 and the cold plate, or the heat insulation structure 40 is disposed between the cold plate and the bottom plate 30 .

[0040] Specifically, the cold plate is used to cool the battery pack 20, and the cold plate is disposed at the bottom of the battery pack 20 and between the battery pack 20 and the bottom plate 30. When the heat insulating structure 40 is disposed at the bottom of the battery pack 20, it can be disposed between the battery pack 20 and the cold plate, or between the cold plate and the bottom plate 30.

[0041] like Figure 3 As shown, in the technical solution of this embodiment, the battery pack also includes a first heat-conducting structure 50, which is arranged in the middle area of ​​the battery compartment 11, and the heat-insulating structure 40 is arranged in the peripheral area of ​​the battery compartment 11.

[0042] Specifically, if Figure 5 As shown, when the battery pack is working, the temperature of the middle area of ​​the battery pack 20 is higher than that of the surrounding area, that is, the temperature of the middle area of ​​the battery compartment 11 is higher than that of the surrounding area. This temperature difference is not conducive to the normal operation of the battery pack 20, so it is necessary to keep the battery pack 20 as a whole at a uniform temperature.

[0043] Therefore, in this embodiment, a first heat-conducting structure 50 is arranged in the middle position of the battery pack 20, and a heat-insulating structure 40 is arranged at the edge position of the battery pack 20, that is, the first heat-conducting structure 50 is arranged in the middle area of ​​the battery compartment 11, and a heat-insulating structure 40 is arranged in the peripheral area of ​​the battery compartment 11.

[0044] Furthermore, the aforementioned middle position and edge position of the battery pack 20 refer to the middle position and edge position of all the battery packs 20 .

[0045] That is, in this embodiment, the heat insulation structure 40 not only serves to isolate the high temperature generated in the electrical compartment 12, but also serves to slow down the temperature at the edge of the battery pack 20 from dissipating outward.

[0046] Furthermore, since the first heat-conducting structure 50 is disposed at the middle of the battery pack 20 , the temperature at the middle of the battery pack 20 can be easily conducted outwards, thereby reducing the temperature at the middle of the battery pack 20 .

[0047] Furthermore, since the heat insulating structure 40 is disposed at the edge of the battery pack 20 , the temperature at the edge of the battery pack 20 is not easily discharged outward, which has the effect of keeping the edge of the battery pack 20 warm to a certain extent.

[0048] Therefore, by providing the first heat-conducting structure 50 and the heat-insulating structure 40, the temperature of the middle portion of the battery pack 20 is reduced, and the temperature of the edge portion of the battery pack 20 is increased, so that the battery pack 20 as a whole can be maintained in a relatively uniform temperature range, which is beneficial for the battery pack 20 to maintain a stable working state.

[0049] Furthermore, the thermal conductivity R1 of the first heat-conducting structure 50 and the thermal conductivity R2 of the heat-insulating structure 40 satisfy the following relationship:

[0050] R1>air thermal conductivity>R2.

[0051] Specifically, since R1 is greater than the thermal conductivity of air, the first heat-conducting structure 50 can better conduct the temperature of the middle portion of the battery pack 20 to the outside and reduce the temperature of the middle portion of the battery pack 20 .

[0052] Furthermore, since R2 is smaller than the thermal conductivity of air, the heat in the area of ​​the battery pack 20 covered by the thermal insulation structure 40 is not easily dissipated outward, causing the temperature of the edge of the battery pack 20 to increase.

[0053] By setting the thermal conductivity of the first heat-conducting structure 50 and the heat-insulating structure 40 as described above, the overall temperature of the battery pack 20 tends to be uniform.

[0054] Preferably, the thermal conductivity R2 of the heat insulating structure 40 is less than or equal to 0.02 W / (m·K), so as to better insulate the edge of the battery pack 20 .

[0055] For example, the thermal conductivity R2 of the thermal insulation structure 40 can be selected as 0.02 W / (m·K), 0.018 W / (m·K), 0.016 W / (m·K), 0.014 W / (m·K), etc.

[0056] like Figure 3 and Figure 4As shown, in the technical solution of this embodiment, the first heat-conducting structure 50 is disposed between the battery pack 20 and the box cover, and the first heat-conducting structure 50 is in contact with the box cover.

[0057] Specifically, at the top of the battery pack, an air layer for thermal runaway exhaust is usually provided between the battery pack 20 and the box cover, and there is generally an MPP (modified polypropylene) pad (second thermal conductive structure 60) between the battery pack 20 and the bottom plate 30 or the cold plate to prevent bottom impact. Since the MPP material has a higher thermal conductivity than air, the MPP pad under the battery pack 20 can play a certain degree of thermal conductivity role, so the top of the battery pack 20 requires more thermal conductivity than the bottom of the battery pack 20. In addition, poles and conductive bars are usually provided at the top of the battery 21, so the thermal conductivity requirements are higher. Therefore, in this embodiment, the first thermal conductive structure 50 is arranged at the top of the battery pack 20, that is, between the battery pack 20 and the box cover, and the first thermal conductive structure 50 is in contact with the box cover, which meets the thermal conductivity requirements of the top center of the battery pack 20.

[0058] like Figure 3 and Figure 4 As shown, in this embodiment, the battery pack 20 is divided into four areas, each area is a rectangular structure, and the four areas are arranged in an array (two rows and two columns structure). The first heat-conducting structure 50 is adaptively divided into four pieces, and each first heat-conducting structure 50 is correspondingly arranged at the inner corner position of each area. The four first heat-conducting structures 50 cover the center position of the entire battery pack 20.

[0059] like Figure 2 and Figure 4 As shown, in the technical solution of this embodiment, the heat insulation structure 40 is arranged at the bottom position of the battery pack 20.

[0060] In some embodiments not shown, the thermal insulation structure 40 may also be disposed at the top of the battery pack 20 , that is, the thermal insulation structure 40 is disposed between the battery pack 20 and the box cover, and the thermal insulation structure 40 is in contact with the box cover.

[0061] In the above-mentioned embodiment not shown, the heat insulating structure 40 and the first heat conducting structure 50 are located on the same side of the battery pack 20 .

[0062] like Figure 2 and Figure 4 As shown, in the technical solution of this embodiment, there are four heat insulation structures 40 , and the four heat insulation structures 40 are respectively arranged at the four corners of the battery pack 20 .

[0063] like Figure 5 As shown, when the battery pack is working, the temperature is lowest at the four corners of the battery pack 20. Therefore, four heat insulation structures 40 are preferably provided and are respectively located at the four corners of the battery pack 20.

[0064] In some embodiments not shown, the thermal insulation structure 40 may also be disposed around the edge of the battery pack 20 .

[0065] More preferably, from Figure 5 It can be seen that when the battery pack is working, the four corners of the battery pack 20 are located at the front and rear ( Figure 2 and Figure 3 Therefore, the preferred locations of the four heat insulation structures 40 in this embodiment are: the left side of the front edge, the right side of the dot edge, the left side of the rear edge, and the right side of the rear edge.

[0066] By such arrangement, the temperature of the four corners of the battery pack 20 where the temperature is the lowest can be increased, thereby further ensuring that the entire battery pack 20 is in a state of uniform temperature.

[0067] like Figure 2 and Figure 4 As shown, in the technical solution of this embodiment, the battery pack also includes a second heat-conducting structure 60, which is arranged at the bottom of the battery pack 20, and the second heat-conducting structure 60 is provided with a notch 61 at the corner of the battery pack 20 corresponding to the second heat-conducting structure 60, and the heat-insulating structure 40 is arranged at the bottom of the battery pack 20, and the heat-insulating structure 40 is located in the notch 61 of the second heat-conducting structure 60.

[0068] Specifically, the second heat-conducting structure 60 is an MPP pad, which, on the one hand, protects the bottom of the battery pack 20 from impact, and on the other hand, conducts heat and dissipates heat for the bottom of the battery pack 20 .

[0069] As described above, since the battery pack 20 is divided into four areas, the second heat-conducting structure 60 is also divided into four pieces. The four second heat-conducting structures 60 cover the bottom positions of the four areas respectively.

[0070] Furthermore, each second heat-conducting structure 60 is provided with a notch 61, and the notch 61 is used to accommodate the heat-insulating structure 40. The positions of the notches 61 on the four second heat-conducting structures 60 correspond to the preferred installation positions of the four heat-insulating structures 40 mentioned above.

[0071] In this embodiment, the battery pack further includes a water cooling system, and the water cooling system includes a water inlet and a water outlet. On a reference plane parallel to the bottom plate 30, the projection of the heat insulation structure 40 at least partially overlaps with the projection of the water inlet, and / or the projection of the heat insulation structure 40 at least partially overlaps with the projection of the water outlet.

[0072] Specifically, the water cooling system is used to cool the battery pack 20. The water temperature at the water inlet is relatively low. The cold water absorbs heat and is heated, and the hot water is discharged from the water outlet. Therefore, in the water cooling system, the temperature at the water inlet and the temperature at the water outlet have a certain temperature difference with the battery pack 20. Therefore, in this embodiment, by providing a heat insulation structure 40 with a small thermal conductivity at the water inlet and the water outlet, the water inlet and the water outlet are isolated from the battery pack 20 to prevent the temperature at the water inlet and the water outlet from affecting and fluctuating the overall temperature of the battery pack.

[0073] Optionally, a heat insulation structure 40 may be provided at both the water inlet and the water outlet.

[0074] Optionally, the heat insulation structure 40 may be provided only at the water inlet.

[0075] Optionally, the heat insulation structure 40 may be provided only at the water outlet.

[0076] In the technical solution of this embodiment, the heat insulation structure 40 includes a heat insulation layer and a coating layer coated outside the heat insulation layer. The heat insulation layer can be made of a material with a small thermal conductivity, and the coating layer is coated outside the heat insulation layer. The coating layer can be made of an impact-resistant material to assist the bottom of the battery pack 20 in resisting impact.

[0077] Optionally, the thickness of the heat insulation structure 40 is greater than or equal to 4 mm. If the thickness of the heat insulation structure 40 is too small, it cannot achieve a good heat insulation effect.

[0078] For example, the thickness of the thermal insulation structure 40 may be set to 4 mm, 5 mm, 6 mm, 7 mm, and so on.

[0079] Optionally, in this embodiment, the first heat-conducting structure 50 may be a heat-conducting adhesive, that is, the heat-conducting adhesive may be coated on the middle portion of the battery pack 20 to form the first heat-conducting structure 50 .

[0080] Optionally, in this embodiment, the first heat conducting structure 50 may also be an MPP foam pad, a PU foam pad or a silicone pad.

[0081] Optionally, in this embodiment, the first heat-conducting structure 50 may also be a composite layer. Specifically, the first heat-conducting structure 50 is formed by stacking several of the following structures:

[0082] MPP foam, PU foam and silicone pad.

[0083] For example, the first heat conducting structure 50 may be formed by stacking an MPP foam pad and a silicone pad, or the first heat conducting structure 50 may be formed by stacking an MPP foam pad and a PU foam pad, or the first heat conducting structure 50 may be formed by stacking a PU foam pad.

[0084] For another example, the first heat conducting structure 50 may be formed by stacking an MPP foam pad, a PU foam pad and a silicone pad.

[0085] In the technical solution of this embodiment, the projection area of ​​the first heat-conducting structure 50 on the surface of the battery pack 20 is S1, and the area of ​​the surface of the battery pack 20 facing the first heat-conducting structure 50 is S2. S1 and S2 satisfy the following relationship:

[0086] 0.05≤S1 / S2≤0.5.

[0087] Specifically, in this embodiment, the first heat-conducting structure 50 needs to cover a moderate proportion of the surface of the battery pack 20. If the area of ​​the first heat-conducting structure 50 is too small, the heat-conducting effect is not obvious. If the area of ​​the first heat-conducting structure 50 is too large, the battery pack will be overcosted.

[0088] It should be noted that the area of ​​the surface of the battery pack 20 facing the first heat conducting structure 50 is the area of ​​the surface of all the battery packs 20 facing the first heat conducting structure 50 .

[0089] like Figure 2 As shown, in the technical solution of this embodiment, the battery pack 20 includes a plurality of batteries 21, and the end surface of the battery 21 facing the box cover is provided with a pole and an explosion-proof valve. Specifically, the poles of the plurality of batteries 21 are connected to the external electrical equipment after being collected by the conductive bar. When the temperature and pressure inside the battery 21 increase, the explosion-proof valve is destroyed and the pressure inside the battery 21 is released, thereby preventing further thermal runaway.

[0090] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A battery pack, characterized in that: include: A box body (10), wherein a battery compartment (11) and an electrical compartment (12) are formed in the box body, wherein the battery compartment (11) and the electrical compartment (12) are arranged adjacent to each other, wherein a battery pack (20) is arranged in the battery compartment (11), wherein a power supply control element is arranged in the battery compartment (11), and wherein a high-voltage conductive busbar of the battery pack (20) is connected to the electrical compartment (12); A bottom plate (30) and a box cover are respectively arranged at the bottom and top of the box body (10); A cold plate, arranged between the battery pack (20) and the bottom plate (30); a heat insulation structure (40), the heat insulation structure being arranged between the battery pack (20) and the box cover, and / or the heat insulation structure (40) being arranged between the battery pack (20) and the cold plate, and / or the heat insulation structure (40) being arranged between the cold plate and the bottom plate (30), The thermal insulation structure (40) is arranged parallel to the bottom plate (30) or the box cover, and the maximum distance between the edge of the thermal insulation structure (40) facing the electrical compartment (12) and the electrical compartment (12) is in the range of 2 mm to 2000 mm.

2. The battery pack according to claim 1, characterized in that: The battery pack further comprises a first heat-conducting structure (50), wherein the first heat-conducting structure (50) is arranged in a middle area of ​​the battery compartment (11), and the heat-insulating structure (40) is arranged in a peripheral area of ​​the battery compartment (11).

3. The battery pack according to claim 2, characterized in that: The thermal conductivity coefficient R1 of the first heat-conducting structure (50) and the thermal conductivity coefficient R2 of the heat-insulating structure (40) satisfy the following relationship: R1>air thermal conductivity>R2.

4. The battery pack according to claim 2, characterized in that: The thermal insulation structure (40) has a thermal conductivity R2 less than or equal to 0.02 W / (m·K).

5. The battery pack according to claim 2, characterized in that: The first heat-conducting structure (50) is arranged between the battery pack (20) and the box cover, and the first heat-conducting structure (50) is in contact with the box cover, and the heat-insulating structure (40) is arranged between the battery pack (20) and the box cover, and the heat-insulating structure (40) is in contact with the box cover.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The heat insulation structure (40) is respectively arranged at the four corners of the battery pack (20).

7. The battery pack according to claim 6, characterized in that: The battery pack further comprises a second heat-conducting structure (60), the second heat-conducting structure (60) being arranged at the bottom of the battery pack (20), the second heat-conducting structure (60) being provided with a notch (61) at a corner corresponding to the battery pack (20), the heat-insulating structure (40) being arranged at the bottom of the battery pack (20), the heat-insulating structure (40) being located in the notch (61) of the second heat-conducting structure (60).

8. The battery pack according to any one of claims 1 to 5, characterized in that: The battery pack also includes a water cooling system, the water cooling system includes a water inlet and a water outlet, and on a reference plane parallel to the bottom plate (30), the projection of the thermal insulation structure (40) at least partially overlaps with the projection of the water inlet, and / or the projection of the thermal insulation structure (40) at least partially overlaps with the projection of the water outlet.

9. The battery pack according to any one of claims 1 to 5, characterized in that: The thickness of the heat insulation structure (40) is greater than or equal to 4 mm.

10. The battery pack according to any one of claims 2 to 5, characterized in that: The projection area of ​​the first heat-conducting structure (50) on the surface of the battery pack (20) is S1, and the area of ​​the surface of the battery pack (20) facing the first heat-conducting structure (50) is S2, and S1 and S2 satisfy the following relationship: 0.05≤S1 / S2≤0.

5.

11. The battery pack according to any one of claims 1 to 5, characterized in that: The battery pack (20) comprises a plurality of batteries (21), and the end surfaces of the batteries (21) facing the box cover are provided with poles and explosion-proof valves.

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