Cells, battery modules, battery packs and vehicles

Abstract

The embodiments of the present utility model provide a bar piece, a battery module, a battery pack and a vehicle. The bar piece includes a bar piece body and a heat dissipation part. The bar piece body includes a first conductive body, a flexible bending section and a second conductive body which are sequentially connected along a first direction, the first conductive body is used to electrically connect to the pole of one of the battery cells, the second conductive body is used to electrically connect to the pole of another battery cell adjacent to the battery cell, and at least one of the first conductive body and the second conductive body is connected to the heat dissipation part. The heat dissipation part can improve the heat dissipation capacity of the bar piece, and the flexible bending section helps to reduce or otherwise eliminate the adaptability to battery cells of different sizes and the pulling force of the pole. Therefore, the bar piece according to the embodiments of the present utility model has the advantages of improving the good heat dissipation performance and the stability of the connection between the bar piece and the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a vehicle and a battery module, a battery pack and a vehicle having the same. Background Art

[0002] Power batteries generate heat during the charging process. The greater the current passing through the battery cell, the greater the heat generated and the higher the temperature, especially for high-power fast-charging power batteries. At present, in order to solve the charging time problem, the power battery has increased the fast-charging current of the battery to more than 600A. In order to meet the charging needs of the battery cell and ensure the safety of the battery, it is urgent to improve the cooling capacity of the battery. The top cover of the battery cell generates heat particularly seriously during the fast charging process of the battery due to the limitations of the top space and the pole setting. The current expansion of the battery cell during the charging and discharging process will repeatedly involve the bar or the vibration of the vehicle during driving, which will cause the corresponding stress to be applied to the single pole and the interface between the pole and the bar, causing the connection between the bar and the pole to fail. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the utility model provides a bar. The bar has the advantages of good heat dissipation performance and high connection stability.

[0004] The embodiment of the present invention further provides a battery module.

[0005] An embodiment of the present invention further provides a battery pack.

[0006] An embodiment of the utility model further provides a vehicle.

[0007] The bar piece of the embodiment of the utility model includes a bar piece body and a heat dissipation part.

[0008] The bar body includes a first conductive body, a flexible bending section, and a second conductive body which are sequentially connected along a first direction, the first conductive body being used to be electrically connected to a pole of one of a plurality of battery cells of a battery module, and the second conductive body being used to be electrically connected to a pole of another of the plurality of battery cells; at least one of the first conductive body and the second conductive body is connected to the heat dissipation portion.

[0009] The bar piece of the embodiment of the utility model is divided into a first conductive body, a flexible bending section and a second conductive body which are sequentially connected and arranged along a first direction. The flexible bending section can be deformed to adapt to and release the welding force applied to the bar piece and the pole by the vibration of the battery cell, the manufacturing tolerance and the expansion of the battery cell, thereby improving the stability of the bar piece and the pole after welding. At the same time, the flexible bending section can also help reduce or eliminate the adaptability to battery cells of different sizes. Furthermore, at the same time, the flexible bending section can also increase the surface area of ​​the bar piece body, thereby further improving the heat dissipation effect of the bar piece, thereby helping to eliminate the expansion of the battery cell.

[0010] In addition, the heat dissipation part can enhance the heat dissipation capacity of the tabs, thereby effectively avoiding the problem of excessive temperature of the wound tabs inside the battery cell causing battery cell expansion or thermal runaway. It not only improves the safety of battery pack use, but also synergistically reduces the problem of pulling on the tabs and poles caused by the expansion of the battery cell.

[0011] Therefore, the bar of the embodiment of the utility model has the advantages of good heat dissipation performance and high connection stability.

[0012] In some embodiments, the first conductive body and / or the second conductive body is provided with a welding hole.

[0013] In some embodiments, the flexible bending section bends toward a direction close to the battery module.

[0014] In some embodiments, the heat dissipation portion and the bar plate body are welded or integrally formed.

[0015] In some embodiments, the heat dissipation portion is a fin structure.

[0016] In some embodiments, the heat dissipation portion is disposed on one side of the first conductive body and the second conductive body in a second direction, and the second direction is perpendicular to the first direction.

[0017] In some embodiments, the length of the flap body along the first direction is L1, and L1 is 20 mm to 200 mm.

[0018] In some embodiments, the width of the flap body along the second direction is W1, W1 is 10 mm to 75 mm, and the second direction is perpendicular to the first direction.

[0019] In some embodiments, the thickness of the flap body along the third direction is h, h is 0.5 mm to 5 mm, and the third direction is perpendicular to both the first direction and the second direction.

[0020] In some embodiments, the bending depth of the flexible bending section is 0.5 mm to 5 mm.

[0021] In some embodiments, the cross-sectional area of ​​the bar body is 10 mm 2 Up to 150mm 2 .

[0022] In some embodiments, the length of the heat dissipation portion along the first direction is L2; ​​L2 is 5 mm to (L1-2 mm) / 2.

[0023] In some embodiments, a width of the heat dissipation portion along the second direction is W2, and W2 is 8 mm to 100 mm.

[0024] In some embodiments, the first conductive body and / or the second conductive body is provided with a welding hole, and the projection of the hole wall of the welding hole in the third direction can fall on the pole.

[0025] The battery module of an embodiment of the utility model includes a battery cell row and a bar according to any one of the above-mentioned battery cells, wherein the battery cell row includes a plurality of battery cells arranged along a first direction, the first conductive body is connected to a pole of one of the battery cells, and the second conductive body is connected to a pole of another of the battery cells.

[0026] In some embodiments, the battery module also includes a cooling plate, the battery cell includes a first end face and a pole arranged on the first end face, there are multiple bar plates, the first end face of each of the battery cells is heat exchange connected to the first cooling surface of at least one of the cooling plates, each of the bar plates is heat exchange connected to the first cooling surface of at least one of the cooling plates and / or the second cooling surface of the cooling plate, the first cooling surface and the second cooling surface are arranged opposite to each other along a third direction, and the third direction is perpendicular to the first direction.

[0027] In some embodiments, the first cooling surface is connected to the first end surface of each of the battery cells through a heat-conducting layer, and / or the second cooling surface is bonded to the bar through a heat-conducting layer; wherein the thermal conductivity of the heat-conducting layer is greater than or equal to ≥0.2W / (m*K), and the thickness of the heat-conducting layer is less than or equal to 5mm.

[0028] The battery pack of the embodiment of the present invention includes a battery module as described in any one of the above.

[0029] The vehicle of the embodiment of the utility model includes the battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a three-dimensional diagram of a battery module according to an embodiment of the present utility model.

[0031] Figure 2 It is a diagram of the coordination of the bar, cooling plate and battery cell according to an embodiment of the utility model.

[0032] Figure 3 It is a three-dimensional diagram of a bar piece according to an embodiment of the present utility model.

[0033] Figure 4 It is another three-dimensional diagram of the bar piece according to an embodiment of the present utility model.

[0034] Figure 5 It is a three-dimensional diagram of a battery cell according to an embodiment of the utility model.

[0035] Reference numerals:

[0036] Battery module 1000;

[0037] Bar 100; battery cell 200; shoulder 201; pole 202; cooling plate 300; first cooling surface 301; second cooling surface 302; cooling bottom plate 400;

[0038] The bar body 1; the first conductive body 11; the flexible bending section 12; the second conductive body 13; the welding hole 14;

[0039] Heat dissipation unit 2. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0041] Reference below Figure 1-Figure 5 The battery sheet 100, the battery module 1000, the battery pack and the vehicle according to the embodiment of the present invention are described.

[0042] The bar 100 of the embodiment of the utility model includes a bar body 1 and a heat dissipation portion 2. The bar body 1 includes a first direction (for example, Figure 2 and Figure 4 The first conductive body 11, the flexible bending section 12 and the second conductive body 13 are sequentially connected (in the left and right directions shown in the figure), the first conductive body 11 is used to be electrically connected to the pole 202 of one of the multiple battery cells 200 of the battery module, the second conductive body 13 is used to be electrically connected to the pole 202 of another of the multiple battery cells 200, and at least one of the first conductive body 11 and the second conductive body 13 is connected to the heat dissipation portion 2.

[0043] The bar 100 of the embodiment of the utility model is divided into a first conductive body 11, a flexible bending section 12, and a second conductive body 13 which are sequentially connected and arranged along a first direction. The flexible bending section 12 can be deformed to adapt to and release the welding force between the bar 100 and the pole 202 applied by the vibration of the battery cell 200, the manufacturing tolerance, and the expansion of the battery cell 200, thereby improving the stability of the bar 100 and the pole 202 after welding. At the same time, the flexible bending section 12 also helps to reduce or eliminate the adaptability to different sizes of battery cells 200. Furthermore, at the same time, the flexible bending section 12 can also increase the surface area of ​​the bar body 1, thereby further improving the heat dissipation effect of the bar 100, thereby helping to eliminate the expansion of the battery cell 200.

[0044] In addition, the heat dissipation portion 2 can enhance the heat dissipation capability of the tab 100 , thereby effectively preventing the problem of the battery cell 200 expanding or experiencing thermal runaway due to the excessive temperature of the wound tab inside the battery cell 200 . This not only improves the safety of the battery pack, but also synergistically reduces the problem of the tab 100 and the pole 202 being pulled due to the expansion of the battery cell 200 .

[0045] Therefore, the bar 100 of the embodiment of the present invention has the advantages of good heat dissipation performance and high connection stability.

[0046] Optionally, the flexible bending section 12 is generally in a "V" shape, which allows the bar 100 to deform (e.g., bend, flex, expand and shrink in length, etc.) in response to vibrations and other forces transmitted to and / or between the individual battery cells 200. For example, by partially flexing or deforming the flexible bending section 12 to provide the bar 100 with an overall longer / shorter length or a different shape so that the battery cells 200 vibrate relative to each other, the distance between the poles 202 of the two individual battery cells 200 can change as the individual battery cells 200 move relative to each other, thereby avoiding pulling on the poles 202.

[0047] Further, the flexible bending section 12 may include one or more U-shaped or C-shaped elements, multiple "V-", "U-" or "C-" shaped bends, or one or more "V-", "U-" or "C-" shaped bends oriented 180 degrees relative to each other. Moreover, the flexible bending section 12 may include one or more curves (e.g., "S" shape, partial "S" shape, etc.).

[0048] like Figures 2 to 4As shown, the first conductive body 11 and / or the second conductive body 13 are provided with a welding hole 14, and the projection of the hole wall of the welding hole 14 in the third direction can fall on the pole. It can be understood that the first conductive body 11 is provided with a welding hole 14; or the second conductive body 13 is provided with a welding hole 14; or, the first conductive body 11 and the second conductive body 13 are both provided with a welding hole 14.

[0049] The bar 100 of the embodiment of the utility model has a welding hole 14 set on the corresponding conductive body, and the area around the welding hole is welded through the welding hole 14, thereby increasing the welding area between the conductive body and the pole 202. Therefore, the bar 100 has the advantage of good connection stability.

[0050] Optionally, each of the first conductive body 11 and the second conductive body 13 has a welding hole 14 , and the welding hole 14 on each is located in the middle area of ​​the first conductive body 11 and the second conductive body 13 .

[0051] like Figures 2 to 4 As shown, further, the flexible bending section 12 is oriented toward a direction close to the battery module (for example, Figure 2 and Figure 2 The tab 100 of the utility model embodiment can avoid the problem of occupying the end cover installation space due to excessive bending by bending the flexible bending section 12 toward the direction close to the battery cell 200.

[0052] Furthermore, the thickness of the flexible bending section 12 is less than or equal to the thickness of the flexible bending section 12. This helps to improve the flexibility of the flexible bending section 12 to bend or deform. However, in actual use, the thickness of the flexible bending section 12 is slightly less than or equal to the thickness of the flexible bending section 12. For example, the thickness of the flexible bending section 12 is 70% to 95% of the thickness of the flexible bending section 12. This is to avoid the thickness being too small to affect the fast charging effect.

[0053] like Figures 2 to 4 As shown, the heat dissipation portion 2 and the tab body 1 are welded or integrally formed. Therefore, the tab 100 has the advantages of simple structure and good structural integrity.

[0054] Furthermore, the bar piece 100 may be a copper alloy bar piece 100 or an aluminum alloy bar piece 100. Furthermore, the bar piece 100 may be formed by stamping, machining or casting.

[0055] The heat dissipation part 2 is a fin structure, and the heat dissipation part 2 is arranged on one side of the first conductive body 11 and the second conductive body 13 in the second direction, thereby further improving the heat dissipation effect of this part.

[0056] like Figure 4 As shown, the sheet body 1 is along a first direction (eg, Figure 2 and Figure 4 The length (in the left-right direction shown in FIG) is L1, and L1 is 20 mm to 200 mm.

[0057] The bar 100 of the embodiment of the utility model sets the length of the bar body 1 to 20 mm to 200 mm. Thus, the problem of high cost caused by the excessive length of the bar body 1 is avoided, and the problem of too small welding area with the pole 202 caused by the excessive length of the bar body 1 is avoided. Therefore, the bar 100 of the embodiment of the utility model has the advantages of both cost reduction and good connection stability.

[0058] Optionally, the length of the flap body 1 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 185mm, 190mm, 195mm or 200mm.

[0059] like Figure 4 As shown, the width of the flap body 1 along the second direction is W1, W1 is 10 mm to 75 mm, and the second direction is perpendicular to the first direction.

[0060] The bar piece 100 of the embodiment of the utility model sets the width of the bar piece body 1 along the second direction to 10 mm to 75 mm. Similarly, the bar piece 100 of the embodiment of the utility model has the advantages of cost reduction and good connection stability.

[0061] The width of the flap body 1 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm or 75mm.

[0062] like Figure 4 As shown, the thickness of the flap body 1 along the third direction is h, h is 0.5 mm to 5 mm, and the third direction is perpendicular to both the first direction and the second direction.

[0063] The bar 100 of the embodiment of the utility model sets the thickness of the bar body 1 along the third direction to 10 mm to 75 mm. Thus, the problem of low current capacity caused by too small thickness of the bar body 1, which in turn affects the fast charging capacity of the battery cell 200, is avoided, and the problem of high cost and installation interference caused by too large thickness is also avoided.

[0064] like Figure 4 As shown, the length of the heat dissipation portion 2 along the first direction is L2; ​​L2 is 5 mm to (L1-2 mm) / 2.

[0065] The bar 100 of the embodiment of the utility model can avoid the problem of the heat dissipation effect being affected by the length of the heat dissipation part 2 being too short, and the problem of the installation interference of adjacent bar 100 in the same row of cells 200 caused by the length of the heat dissipation part 2 being too long, by setting the length of the heat dissipation part 2 along the first direction to 5mm to (L1-2mm) / 2. Therefore, the bar 100 has the advantages of good heat dissipation effect and high installation space flexibility.

[0066] Furthermore, there may be two heat dissipation parts 2, one of which is connected to the first conductive body 11, and the other is connected to the second conductive body 13. The length of the heat dissipation part 2 may be consistent with the length of the first conductive body 11. This helps to improve the heat dissipation effect.

[0067] like Figure 4 As shown, the width of the heat dissipation portion 2 along the second direction is W2, and W2 is 8 mm to 100 mm.

[0068] The bar 100 of the embodiment of the utility model sets the width of the heat dissipation part 2 along the second direction to 8mm to 100mm. This not only avoids the problem that the heat dissipation part 2 is too small and affects the heat dissipation effect, but also avoids the problem that the heat dissipation part 2 is too large and affects the installation space between adjacent battery cells 200 rows. Therefore, the bar 100 has the advantages of good heat dissipation effect and high installation space flexibility.

[0069] Optionally, the width of the heat dissipation portion 2 may be 8 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm or 100 mm.

[0070] The bending depth of the flexible bending section 12 is 0.5 mm to 5 mm, thereby avoiding the problem of limited deformation capacity caused by a small bending degree and the problem of installation interference caused by an excessive bending depth.

[0071] Optionally, the bending depth of the flexible bending section 12 is 0.5mm, 0.8mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm or 5mm. Thus, the problem of limited deformation capacity caused by a small bending degree and the problem of installation interference caused by an excessive bending depth are avoided.

[0072] The battery module 1000 of the embodiment of the utility model includes a row of battery cells 200 and a bar 100 according to any one of the above items, the row of battery cells 200 includes a plurality of battery cells 200 arranged along a first direction, the first conductive body 11 is connected to the pole 202 of one of the battery cells 200, and the second conductive body 13 is connected to the pole 202 of another battery cell 200.

[0073] Therefore, the battery module 1000 of the embodiment of the present invention has the advantages of good heat dissipation performance and high connection stability.

[0074] like Figure 2 and Figure 5 As shown, the battery module 1000 also includes a cooling plate 300, the battery cell 200 includes a first end face and a pole 202 arranged on the first end face, the first end face of each battery cell 200 is heat exchange connected to the first cooling surface 301 in at least one cooling plate 300, each bar 100 is heat exchange connected to the first cooling surface 301 in at least one cooling plate 300 and / or the second cooling surface 302 in the cooling plate 300, the first cooling surface 301 and the second cooling surface 302 are arranged opposite to each other along a third direction, and the third direction is perpendicular to the first direction.

[0075] According to the battery module 1000 of the embodiment of the present invention, the cooling plate 300 is arranged on the first end face of the battery cell 200, and is heat exchange connected with the first end face of each battery cell 200 through the first cooling surface 301 in at least one cooling plate 300. At this time, the cooling plate 300 is adjacent to the pole 202 on the first end face to achieve effective cooling of the pole 202. At the same time, each bar 100 can be heat exchange connected with the first cooling surface 301 in at least one cooling plate 300, or can pass through the gap between two adjacent cooling plates 300 and be heat exchange connected with the second cooling surface 302 in at least one cooling plate 300. As a result, the total heat exchange area between the cooling plate 300, the bar 100 and the battery cell 200 is increased, and direct cooling of the bar 100 is also achieved, so that the heat generated by the mechanical parts such as the inner winding ears of the battery cell 200 can be quickly taken away by the cooling plate 300 through the first end surface and the bar 100, effectively avoiding local overheating of the battery module 1000 and causing power limitation of the battery cell 200, thereby improving the efficiency and stability of battery module energy replenishment.

[0076] In some embodiments, Figure 2 and Figure 4 As shown, the first end surface has a shoulder 201, and the shoulder 201 includes a first shoulder and a second shoulder arranged at intervals along the first direction. Adaptively, the height of the cooling plate 300 is generally slightly higher than the height of the pole 202, and the height difference between the cooling plate 300 and the pole 202 is adapted to the height difference between the bar plate body 1 and the heat dissipation part 2, and the height difference between the bar plate body 1 and the heat dissipation part 2 in the third direction is △h.

[0077] The first cooling surface 301 is connected to the first end surface of each battery cell 200 through a heat-conducting layer, and / or the second cooling surface 302 is bonded to the bar 100 through a heat-conducting layer; wherein the thermal conductivity of the heat-conducting layer is greater than or equal to ≥0.2W / (m*K), and the thickness is less than or equal to 5mm.

[0078] Optionally, when the bottom of each battery cell 200 is bonded and connected via a cooling base plate 400, sufficient restraint is provided for the bottom of each battery cell 200, and the bonding of the cooling plate 300 to each battery cell 200 also provides sufficient restraint for the top of each battery cell 200. The cooling base plate 400 effectively prevents the battery cell 200 from tilting due to inconsistent restraints at the bottom and top, thereby pulling the pole 202 and causing the battery cell 200 to leak.

[0079] Specifically, the thermal conductive layer can be a thermal conductive structural adhesive, double-sided adhesive or other adhesive with sufficient bonding strength. The thermal conductivity of the thermal conductive layer is greater than or equal to ≥0.2W / (m*K). In this way, the thermal conductive layer can meet the thermal conductivity requirements and bonding strength requirements while limiting its thickness to less than 5mm, further reducing the space occupied by the thermal conductive layer in the height direction of the battery module 1000.

[0080] In some embodiments, the thermal conductivity of the heat-conducting layer is greater than or equal to 2W / (m*K), and the thickness of the heat-conducting layer is less than or equal to 1mm. This configuration can ensure the insulation strength without causing the thermal resistance of the insulation layer to be too thick, thereby effectively improving the heat exchange efficiency between the bar sheet 100 and the battery cell 200 and the cooling plate 300.

[0081] Furthermore, the thermally conductive layer may be at least one of a thermally conductive structural adhesive, a thermally conductive pad, a thermally conductive gel, a thermally conductive silicone grease and a structural adhesive.

[0082] The battery pack of the embodiment of the present invention may include any one of the battery modules 1000 described above.

[0083] Therefore, the battery pack of the embodiment of the utility model has the advantages of good heat dissipation performance and high connection stability.

[0084] The vehicle of the embodiment of the utility model includes the battery pack as described above.

[0085] Therefore, the vehicle according to the embodiment of the utility model has the advantages of good heat dissipation performance and high connection stability.

[0086] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0088] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0089] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0090] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A bar sheet, characterized in that: include: A tab body, the tab body comprising a first conductive body, a flexible bending section, and a second conductive body sequentially connected along a first direction, the first conductive body being used to be electrically connected to a pole of one of a plurality of battery cells of a battery module, and the second conductive body being used to be electrically connected to a pole of another of the plurality of battery cells; A heat dissipation portion, to which at least one of the first conductive body and the second conductive body is connected.

2. The bar sheet according to claim 1, characterized in that: The flexible bending section bends in a direction close to the battery module; and / or the heat dissipation portion and the bar plate body are welded or integrally formed; and / or the heat dissipation portion is a fin structure, and the heat dissipation portion is arranged on one side of the first conductive body and the second conductive body in a second direction, and the second direction is perpendicular to the first direction.

3. The bar sheet according to claim 1, characterized in that: The length of the bar body along the first direction is L1, and L1 is 20 mm to 200 mm; The width of the flap body along the second direction is W1, W1 is 10 mm to 75 mm, and the second direction is perpendicular to the first direction; The thickness of the flap body along the third direction is h, h is 0.5 mm to 5 mm, and the third direction is perpendicular to both the first direction and the second direction; The bending depth of the flexible bending section is 0.5 mm to 5 mm; The cross-sectional area of ​​the bar body is 10 mm 2 Up to 150mm 2 .

4. The bar sheet according to claim 3, characterized in that: The length of the heat dissipation portion along the first direction is L2; ​​L2 is 5 mm to (L1-2 mm) / 2; The width of the heat dissipation portion along the second direction is W2, and W2 is 8 mm to 100 mm.

5. The bar sheet according to claim 1, characterized in that: The first conductive body and / or the second conductive body is provided with a welding hole, and the projection of the hole wall of the welding hole in the third direction can fall on the pole.

6. A battery module, characterized in that: include: A battery cell row and a bar according to any one of claims 1-5, wherein the battery cell row comprises a plurality of battery cells arranged along a first direction, the first conductive body is connected to a pole of one of the battery cells, and the second conductive body is connected to a pole of another of the battery cells.

7. The battery module according to claim 6, characterized in that: It also includes a cooling plate, the battery cell includes a first end face and a pole arranged on the first end face, there are multiple bar plates, the first end face of each battery cell is heat-exchange connected to the first cooling surface of at least one cooling plate, each bar plate is heat-exchange connected to the first cooling surface of at least one cooling plate and / or the second cooling surface of the cooling plate, the first cooling surface and the second cooling surface are arranged relative to each other along a third direction, and the third direction is perpendicular to the first direction.

8. The battery module according to claim 7, characterized in that: The first cooling surface is connected to the first end surface of each of the battery cells through a heat-conducting layer, and / or the second cooling surface is bonded to the bar through a heat-conducting layer; wherein the thermal conductivity of the heat-conducting layer is greater than or equal to ≥0.2W / (m*K), and the thickness of the heat-conducting layer is less than or equal to 5mm.

9. A battery pack, characterized in that: Comprising a battery module as claimed in any one of claims 6 to 8.

10. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 9.

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