Busbar assembly, battery pack and vehicle

Abstract

The utility model discloses a busbar assembly, a battery pack and a vehicle, the busbar assembly comprises a heat dissipation plate and a busbar, the heat dissipation plate is provided with a heat dissipation channel and a pole hole, and the pole hole is arranged on one side of the heat dissipation channel in the thickness direction of the heat dissipation plate and is communicated with the heat dissipation channel; and at least one part of the busbar is embedded in the heat dissipation plate, and the busbar blocks the pole hole. According to the busbar assembly, the pole hole is communicated with the heat dissipation channel, and at least one part of the busbar is embedded in the heat dissipation plate and blocks the pole hole, so that direct heat dissipation of the busbar can be realized, and the heat dissipation effect of the busbar is improved; moreover, at least one part of the busbar can be arranged in the heat dissipation plate, so that the at least one part of the busbar does not occupy the external space of the heat dissipation plate additionally, and the size of the busbar assembly can be reduced.

Description

Technical Field

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

[0002] With the development of new energy vehicles, the importance of battery life is gradually increasing. One way to improve battery life is to increase the speed of battery charging, that is, to increase the charging speed of the battery, which means that the charging current of the battery is higher. The higher charging current will cause the heat generated at the busbar of the battery to increase sharply, causing the heat to accumulate at the winding lugs of the battery cell, accelerating the aging of the lugs and even causing thermal runaway problems in the battery cell.

[0003] In order to solve the above problems, the related technology generally uses heat sinks and thermally conductive materials to achieve indirect heat dissipation of the bus, which not only leads to poor heat dissipation effect of the bus, but also the components composed of it are large in size, resulting in the component occupying a large space in the battery pack and a low energy density of the battery pack. Utility Model Content

[0004] The utility model provides a busbar assembly to improve the energy density of a battery pack.

[0005] The utility model discloses a busbar assembly comprising a heat sink and a busbar, wherein the heat sink is provided with a heat dissipation channel and a pole hole, wherein the pole hole is provided on one side of the heat dissipation channel in the thickness direction of the heat sink and is connected with the heat dissipation channel; at least a part of the busbar is embedded in the heat sink, and the busbar blocks the pole hole.

[0006] Optionally, the pole hole includes a pole opening facing the heat dissipation channel, and a limiting protrusion is provided at the pole opening, and the limiting protrusion is used to embed the busbar.

[0007] Optionally, the heat dissipation channel includes a first inner wall provided with the pole hole, a groove is formed between the limiting protrusion and the first inner wall, a notch of the groove faces the pole hole, and the bus is embedded in the groove.

[0008] Optionally, the heat dissipation channel includes a second inner wall opposite to the pole hole, and the second inner wall is provided with a channel protrusion.

[0009] Optionally, the channel protrusion is projected in a direction toward the pole hole within a cross section of the pole hole; the channel protrusion stops at the bus bar, or the spacing between the channel protrusion and the bus bar is less than or equal to 0.5 mm.

[0010] Optionally, the heat sink includes a first flow channel plate and a second flow channel plate which are stacked, the first flow channel plate is sealed and connected to the second flow channel plate to form the heat dissipation channel, the pole hole is provided in the first flow channel plate, at least a portion of the bus is embedded in the first flow channel plate, and the transmittance of the second flow channel plate is greater than or equal to 20%.

[0011] Optionally, the thickness of the portion of the busbar that blocks the pole hole is smaller than the thickness of the portion of the busbar that is embedded in the heat sink.

[0012] Optionally, the number of the pole holes and the bus bars are both multiple, and the multiple pole holes are arranged along the length direction of the heat dissipation channel; one part of the bus bars is a first bus bar, the first bus bar is integrally embedded in the heat dissipation plate, and the first bus bar blocks two adjacent pole holes; the other part of the bus bars is a second bus bar, a part of the second bus bar is embedded in the heat dissipation plate, and the second bus bar blocks one pole hole, and the other part of the second bus bar extends out of the heat dissipation plate.

[0013] The utility model also provides a battery pack.

[0014] The battery pack of the utility model comprises a plurality of battery cells and a busbar assembly, wherein the battery cells comprise poles; the busbar assembly is the busbar assembly described in any one of the above items, and the electrical connection portion is electrically connected to the pole.

[0015] The utility model also provides a vehicle.

[0016] The vehicle of the present invention comprises the battery pack described in any one of the above items.

[0017] The busbar assembly of the utility model connects the pole hole with the heat dissipation channel, and at least a part of the busbar is embedded in the heat dissipation plate and blocks the pole hole. Not only can the cooling medium in the heat dissipation channel directly contact the busbar, so that the busbar and the cooling medium are convectively exchanged, and direct heat dissipation of the busbar is achieved, thereby improving the heat dissipation effect of the busbar; but at least a part of the busbar can be arranged in the heat dissipation plate, so that at least a part of the busbar does not occupy additional external space of the heat dissipation plate, thereby reducing the volume of the busbar assembly. Therefore, when the busbar assembly is used in a battery pack, the space occupied by the busbar assembly in the battery pack can be reduced, thereby improving the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a usage status diagram of a busbar assembly according to an embodiment of the utility model.

[0019] Figure 2 yes Figure 1Enlarged view of point A in the middle.

[0020] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0021] Figure 4 It is a structural schematic diagram of a busbar assembly according to another embodiment of the utility model.

[0022] Figure 5 It is an exploded view of a busbar assembly according to another embodiment of the present invention.

[0023] Figure 6 yes Figure 5 Schematic diagram of the structure of the first flow channel plate.

[0024] Figure 7 yes Figure 5 Schematic diagram of the structure of the second flow channel plate.

[0025] Figure 8 It is a cross-sectional view of a busbar assembly according to another embodiment of the utility model.

[0026] Fig. 9 It is a structural schematic diagram of a battery module in a battery pack according to another embodiment of the utility model.

[0027] Fig.10 yes Fig. 9 Cross-sectional view of the battery module.

[0028] Fig.11 yes Fig.10 Enlarged view of point C in the middle.

[0029] Reference numerals:

[0030] 100. Battery module;

[0031] 10. Busbar assembly;

[0032] 1. heat sink; 11. first flow channel plate; 111. first plate body; 112. position limiting protrusion; 12. second flow channel plate; 121. heat dissipation slot; 122. second plate body; 123. channel protrusion; 124. edge protrusion; 101. heat dissipation channel; 102. channel inlet; 103. channel outlet; 104. pole hole;

[0033] 2. busbar; 21. series connection bar; 22. input bar; 221. input connection part; 23. output bar; 201. electrical connection part; 202. fixing part;

[0034] 3. Import connector;

[0035] 4. Outlet connector;

[0036] 20. Battery cell; 2001. Pole. DETAILED DESCRIPTION

[0037] 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.

[0038] like Figure 1 As shown, the busbar assembly 10 of the embodiment of the utility model comprises a heat sink 1 and a busbar 2, at least a portion of the busbar 2 is embedded in the heat sink 1. The heat sink 1 is provided with a heat dissipation channel 101 and a pole hole 104, the pole hole 104 is provided on one side of the heat dissipation channel 101 in the thickness direction of the heat sink 1, the pole hole 104 is connected to the heat dissipation channel 101, and the busbar 2 blocks the pole hole 104.

[0039] For example, Figure 2 and Figure 3 As shown, the busbar 2 includes an electrical connection portion 201 and a fixing portion 202 . The fixing portion 202 is connected to the heat sink 1 , and the electrical connection portion 201 blocks the pole hole 104 .

[0040] The busbar assembly 10 of the embodiment of the utility model, by connecting the pole hole 104 with the heat dissipation channel 101, and at least a part of the busbar 2 is embedded in the heat dissipation plate 1 and blocks the pole hole 104, can not only directly contact the busbar 2 through the cooling medium in the heat dissipation channel 101, so that the busbar 2 and the cooling medium are convectively exchanged, and the direct heat dissipation of the busbar 2 is achieved, thereby improving the heat dissipation effect of the busbar 2; but also can set at least a part of the busbar 2 in the heat dissipation plate 1, so that at least a part of the busbar 2 will not occupy the external space of the heat dissipation plate 1, thereby reducing the volume of the busbar assembly 10. Therefore, when the busbar assembly 10 is used in a battery pack, the space occupied by the busbar assembly 10 in the battery pack can be reduced, the compactness of the battery pack can be improved, and the energy density of the battery pack can be improved. Among them, the cooling medium can be a liquid or a gas.

[0041] like Figure 1 and Figure 4 As shown, the heat sink 1 is provided with a channel inlet 102 and a channel outlet 103, and the channel inlet 102 and the channel outlet 103 are both connected to the heat sink 101. The busbar assembly 10 also includes an inlet joint 3 and an outlet joint 4, and the inlet joint 3 and the outlet joint 4 are used to connect to the pipeline. The inlet joint 3 and the outlet joint 4 are both connected to the heat sink 1, and the inlet joint 3 is connected to the channel inlet 102, and the outlet joint 4 is connected to the channel outlet 103.

[0042] By setting the inlet joint 3 and the outlet joint 4, the cooling medium can enter the heat dissipation channel 101 through the pipeline connected to the inlet joint 3, and the cooling medium in the heat dissipation channel 101 can flow out through the pipeline connected to the outlet joint 4, which facilitates the cooling medium to enter and exit the heat dissipation channel 101.

[0043] Optionally, the cooling medium is an insulating coolant. The insulating coolant may have a resistivity greater than or equal to 10 8 Ω*cm.

[0044] By using insulating coolant as the cooling medium, it is possible to avoid providing an insulating layer on the surface of the busbar 2 facing the heat dissipation channel 101, thereby achieving insulation between the cooling medium and the busbar 2. This is conducive to simplifying the structure of the busbar assembly 10 and reducing the cost of the busbar assembly 10.

[0045] Alternatively, if Figure 2 and Figure 3 As shown, the pole hole 104 includes a pole opening facing the heat dissipation channel 101 , and a limiting protrusion 112 is provided at the pole opening. The limiting protrusion 112 is used to embed the busbar 2 .

[0046] For example, Figure 2 and Figure 3 As shown, the fixing portion 202 is embedded in the limiting protrusion 112 .

[0047] By using the limiting protrusions 112 to embed the busbar 2 , it is beneficial to increase the connection reliability between the busbar 2 and the heat sink 1 , and improve the reliability of the busbar assembly 10 .

[0048] In order to make the technical solution of the present invention easier to understand, the following takes the case where the thickness direction of the heat sink 1 is consistent with the up-down direction as an example to further describe the technical solution of the present invention. Figures 1 to 3 shown.

[0049] For example, Figure 2 and Figure 3 As shown, the pole hole 104 extends in the up-down direction, the heat dissipation channel 101 is arranged on the upper side of the pole hole 104, the upper end opening of the pole hole 104 faces the heat dissipation channel 101, and a limiting protrusion 112 is arranged at the upper end opening of the pole hole 101. The upper surface of the busbar 2 is used to contact with the cooling medium, and the lower surface of the busbar 2 is used to be electrically connected to the pole 2001 of the battery cell 20.

[0050] Alternatively, if Figure 2 and Figure 3As shown, the heat dissipation channel 101 includes a first inner wall with a pole hole 104 , a groove is formed between the limiting protrusion 112 and the first inner wall, the notch of the groove faces the pole hole 104 , and the bus 2 is embedded in the groove.

[0051] For example, the heat dissipation channel 101 includes an upper side wall and a lower side wall, the pole hole 104 is provided on the lower side wall of the heat dissipation channel 101, and the upper surface of the lower side wall of the heat dissipation channel 101 is the first inner wall. A groove is formed between the limiting protrusion 112 and the upper surface of the lower side wall of the heat dissipation channel 101. The groove may be an annular groove provided around the pole hole 104, and the fixing portion 202 is provided in an annular shape and embedded in the groove.

[0052] By embedding a portion of the bus 2 in the groove, the bus 2 can be clamped by the two groove walls of the groove in the thickness direction of the heat sink 1 to limit the position of the bus 2 in the height direction of the heat sink 1, thereby improving the connection reliability between the bus 2 and the first flow channel plate 11 and improving the reliability of the bus assembly 10.

[0053] Of course, in other embodiments, the limiting protrusion 112 and the first inner wall may not form a groove. For example, the limiting protrusion 112 intersects with the first inner wall, the bus 2 includes a first surface and a second surface, the first surface intersects with the second surface, and the limiting protrusion 112 and the first inner wall are respectively fitted with the first surface and the second surface, so that the bus 2 is embedded in the heat sink 1.

[0054] Optionally, there is a gap between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 on a side opposite to the pole hole 104 .

[0055] For example, the lower surface of the upper side wall of the heat dissipation channel 101 is the inner wall of the heat dissipation channel 101 opposite to the pole hole 104 , and there is a gap between the limiting protrusion 112 and the lower surface of the upper side wall of the heat dissipation channel 101 .

[0056] By setting a gap between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 on the side opposite to the pole hole 104, the cooling medium can flow through the gap and indirectly contact the bus 2 through the limiting protrusion 112, thereby cooling and dissipating the part of the bus 2 located in the groove, further improving the heat dissipation efficiency of the bus 2.

[0057] Optionally, the dimension of the heat dissipation channel 101 in the thickness direction of the heat dissipation plate 1 is 2 mm to 20 mm. The distance between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 on the side opposite to the pole hole 104 is 1 mm to 19 mm.

[0058] By setting the dimension of the heat dissipation channel 101 in the thickness direction of the heat dissipation plate 1 to 2 mm to 20 mm, sufficient space is provided for the limiting protrusion 112 when the flow resistance of the cooling medium in the heat dissipation channel 101 is low.

[0059] It can be understood that part of the cooling medium needs to flow through the gap between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 on the side opposite to the pole hole 104. When the gap between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 on the side opposite to the pole hole 104 is too small, the flow resistance of the cooling medium at this location will be relatively large; when the gap between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 on the side opposite to the pole hole 104 is too large, the entire thickness of the heat dissipation plate 1 will be relatively large.

[0060] By setting the distance between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 on the side opposite to the pole hole 104 to 1mm to 19mm, on the one hand, the flow resistance of the cooling medium between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 on the side opposite to the pole hole 104 can be lowered, so as to increase the flow speed of the cooling medium, thereby improving the heat dissipation efficiency of the bus 2; on the other hand, the thickness of the heat dissipation plate 1 can be avoided to be too large, and the space occupied by the bus assembly 10 in the height direction of the battery pack can be further reduced, thereby improving the energy density of the battery pack.

[0061] Optionally, there is a gap between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 in the width direction, and the gap is 5 mm to 50 mm.

[0062] In order to make the technical solution of the present invention easier to understand, the following takes the width direction of the heat sink 1 as being consistent with the left-right direction and the length direction of the heat sink 1 as being consistent with the front-back direction as an example to further describe the technical solution of the present invention. Figures 4 to 7 As shown, the front-to-back direction is Figures 1 to 8 shown.

[0063] For example, the heat dissipation channel 101 extends in the front-to-back direction. The right side surface of the left side wall of the heat dissipation channel 101 and the left side surface of the right side wall of the heat dissipation channel 101 are both inner side walls in the width direction of the heat dissipation channel 101. The spacing between the left end of the limiting protrusion 112 and the right side surface of the left side wall of the heat dissipation channel 101 is 5 mm to 50 mm, and the spacing between the right end of the limiting protrusion 112 and the left side surface of the right side wall of the heat dissipation channel 101 is 5 mm to 50 mm.

[0064] By providing a gap between the inner walls of the heat dissipation channel 101 in the width direction, the cooling medium can flow through the gap and indirectly contact the bus 2 through the heat dissipation plate 1, thereby cooling and dissipating the bus 2 and further improving the heat dissipation efficiency of the bus 2.

[0065] In addition, it is understandable that if the interval between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 in the width direction is too small, the flow resistance of the cooling medium at that location will be relatively large; if the interval between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 in the width direction is too large, the heat dissipation plate 1 will be relatively large. The interval between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 in the width direction is set to 5mm to 50mm. On the one hand, the flow resistance of the cooling medium between the limiting protrusion 112 and the inner wall of the heat dissipation channel 101 in the width direction can be relatively low, so as to increase the flow speed of the cooling medium and further improve the heat dissipation efficiency of the bus 2; on the other hand, the heat dissipation plate 1 can be prevented from being relatively large, further reducing the occupied space of the bus assembly 10 and improving the energy density of the battery pack.

[0066] Alternatively, if Figures 4 to 6 As shown, the heat sink 1 includes a first flow channel plate 11 and a second flow channel plate 12 stacked along its thickness direction, the first flow channel plate 11 and the second flow channel plate 12 are sealed and connected, and at least a portion of the busbar 2 is embedded in the first flow channel plate 11. Figure 8 As shown, the first flow channel plate 11 and the second flow channel plate 12 form a heat dissipation channel 101, the pole hole 104 is provided on the first flow channel plate 11, and the limiting protrusion 112 is provided on the first flow channel plate 11. The first flow channel plate 11 and the second flow channel plate 12 can be welded, hot-riveted or bonded by structural adhesive.

[0067] For example, Figure 7 As shown, the second flow channel plate 12 is provided with a heat dissipation groove 121 , and the heat dissipation channel 101 is formed between the first flow channel plate 11 and the second flow channel plate 12 through the heat dissipation groove 121 .

[0068] As an exemplary embodiment, the inner wall of the first flow channel plate 11 facing the second flow channel plate 12 is the first inner wall, and a groove is formed between the limiting protrusion 112 and the inner wall of the first flow channel plate 11 facing the second flow channel plate 12 .

[0069] By sealing and connecting the first flow channel plate 11 and the second flow channel plate 12 to form a heat dissipation channel 101, the processing and manufacturing of the heat dissipation plate 1 is facilitated, thereby facilitating the processing and manufacturing of the busbar assembly 10, which is conducive to reducing the manufacturing cost of the busbar assembly 10.

[0070] Alternatively, if Figure 8 As shown, the heat dissipation channel 101 includes a second inner wall opposite to the pole hole 104 , and the second inner wall is provided with a channel protrusion 123 .

[0071] By providing the channel protrusion 123 in the heat dissipation channel 101 , the channel protrusion 123 plays a role in disturbing the cooling medium in the heat dissipation channel 101 , thereby improving the heat exchange efficiency between the heat dissipation plate 1 and the cooling medium, and further improving the heat dissipation effect of the busbar 2 .

[0072] As an example, Figure 7 and Figure 8 As shown, the inner wall of the second flow channel plate 12 facing the first flow channel plate 11 is the second inner wall of the heat dissipation channel 101. The channel protrusion 123 is disposed on the inner wall of the second flow channel plate 12 facing the first flow channel plate 11.

[0073] Alternatively, if Figure 8 As shown, the orthographic projection of the channel protrusion 123 in the direction toward the pole hole 104 is located in the cross section of the pole hole 104. The channel protrusion 123 stops at the electrical connection portion 201. In other embodiments, the spacing between the channel protrusion 123 and the busbar 2 is less than or equal to 0.5 mm.

[0074] For example, Figure 8 As shown, the channel protrusion 123 is arranged just above the pole hole 104. In other words, the downward projection of the channel protrusion 123 is located within the cross section of the pole hole 104. The lower end of the channel protrusion 123 stops downward at the electrical connection portion 201, or the spacing between the lower end of the channel protrusion 123 and the electrical connection portion 201 is less than or equal to 0.5 mm.

[0075] It is understandable that when a clamping force is applied in the thickness direction of the heat sink 1, or when a pressure is applied to the second flow channel plate 12 provided with the channel protrusion 123 toward the first flow channel plate 11, the second flow channel plate 12 will deform toward the first flow channel plate 11. When the spacing between the channel protrusion 123 and the bus bar 2 is less than or equal to 0.5 mm, when the second flow channel plate 12 deforms toward the first flow channel plate 11, the channel protrusion 123 can stop at the electrical connection portion 201.

[0076] During the manufacturing or use of the busbar assembly 10, it is usually necessary to clamp the busbar assembly 10. For example, when the busbar 2 is electrically connected to the pole 2001 of the battery cell 20, a clamp is needed to hold the busbar 2 and the pole 2001 in close contact. By providing the channel protrusion 123, the clamp can be clamped at the channel protrusion 123, and the channel protrusion 123 is used to stop at the electrical connection part 201, so as to achieve support between the first flow channel plate 11 and the second flow channel plate 12, thereby preventing the heat sink 1 from being damaged by clamping, and improving the reliability of the busbar assembly 10.

[0077] Optionally, the channel protrusion 123 may be cylindrical, strip-shaped, fan-shaped, or elliptical-shaped.

[0078] As an example, the channel protrusion 123 is provided on the second flow channel plate 12 , and the orthographic projection of the channel protrusion 123 in the direction toward the first flow channel plate 11 is located within the cross section of the pole hole 104 .

[0079] Alternatively, if Figure 6 As shown, the first flow channel plate 11 includes a first plate body 111 , and the first plate body 111 is in a flat plate shape as a whole.

[0080] By setting the first plate body 111 to be in a flat plate shape, the structure of the first flow channel plate 11 is simple, and it is convenient to process and manufacture, which is beneficial to reducing the cost of the busbar assembly 10 .

[0081] Alternatively, if Figure 7 As shown, the second flow channel plate 12 includes a second plate body 122 and an edge protrusion 124, and the edge protrusion 124 is arranged on the side of the second plate body 122 facing the first flow channel plate 11. The edge protrusion 124 is arranged around the edge of the second plate body 122, and the heat dissipation groove 121 is formed between the second plate body 122 and the edge protrusion 124. The edge protrusion 124 is sealed and connected to the first flow channel plate 11, and the width of the edge protrusion 124 is greater than or equal to 2 mm.

[0082] For example, Figure 7 As shown, the edge protrusion 124 is arranged on the lower side of the second plate body 122, and a heat dissipation groove 121 with an opening facing downward is formed between the edge protrusion 124 and the second plate body 122. The lower end of the edge protrusion 124 is sealed and connected to the first flow channel plate 11, so that a heat dissipation channel 101 is formed between the first flow channel plate 11 and the second flow channel plate 12.

[0083] By setting the width of the edge protrusion 124 to be greater than or equal to 2 mm, a larger contact area can be ensured between the edge protrusion 124 and the first flow channel plate 11, thereby improving the connection reliability between the first flow channel plate 11 and the second flow channel plate 12, avoiding leakage problems in the heat dissipation channel 101, and improving the reliability of the bus assembly 10.

[0084] Optionally, the light transmittance of the second flow channel plate 12 is greater than or equal to 20%.

[0085] For example, the second flow channel plate 12 is made of hydrolysis-resistant engineering plastics, such as PA66+GF30, wherein PA is nylon and GF is glass fiber.

[0086] By setting the light transmittance of the second flow channel plate 12 to be greater than or equal to 20%, the laser can penetrate the second flow channel plate 12, and the laser is used to achieve welding between the electrical connection portion 201 and the pole 2001. Therefore, the second flow channel plate 12 does not need to be provided with welding holes, the structure of the heat sink 1 can be simplified, the processing and manufacturing of the busbar assembly 10 is convenient, and the manufacturing cost of the busbar assembly 10 is reduced.

[0087] Optionally, the thickness of the portion of the busbar 2 that blocks the pole hole 104 is smaller than the thickness of the portion of the busbar 2 that is embedded in the heat sink 1 .

[0088] For example, the electrical connection portion 201 of the busbar 2 blocks the pole hole 104 , the fixing portion 202 of the busbar 2 is embedded in the heat sink 1 , and the thickness of the electrical connection portion 201 is smaller than the thickness of the fixing portion 202 .

[0089] It can be understood that the portion of the bus 2 that blocks the pole hole 104 is used to electrically connect with the pole 2001 of the battery cell 20. By setting the thickness of the portion of the bus 2 that blocks the pole hole 104 to be smaller than the thickness of the portion of the bus 2 embedded in the heat sink 1, the laser can easily penetrate the portion of the bus 2 that blocks the pole hole 104 and the pole 2001 when laser welding is performed, thereby facilitating the welding of the bus 2 and the pole 2001.

[0090] Optionally, the first flow channel plate 11 is a plastic plate, and the busbar 2 and the first flow channel plate 11 are integrally injection molded.

[0091] The bus bar 2 and the first flow channel plate 11 are integrally injection molded, which facilitates the processing and manufacturing of the bus bar assembly 10 .

[0092] Optionally, the channel inlet 102 and the channel outlet 103 are both provided on the first flow channel plate 11. The inlet connector 3, the outlet connector 4 and the first flow channel plate 11 are integrally formed.

[0093] For example, the inlet connector 3, the outlet connector 4 and the first flow channel plate 11 are integrally injection molded.

[0094] Of course, in other embodiments, the inlet joint 3 , the outlet joint 4 and the first flow channel plate 11 may also be manufactured separately, and the inlet joint 3 and the outlet joint 4 are bonded or welded to the first flow channel plate 11 .

[0095] Optionally, the first flow channel plate 11 and the second flow channel plate 12 are both insulating plates, for example, the first flow channel plate 11 and the second flow channel plate 12 are both plastic plates.

[0096] By setting the first flow channel plate 11 and the second flow channel plate 12 as insulating plates, it is convenient to achieve insulation between the first flow channel plate 11 and the second flow channel plate 12 and the busbar 2. The short circuit risk when the battery cell 20 has thermal runaway and explosion can be reduced, which is conducive to improving the safety of the battery pack.

[0097] Of course, in other embodiments, the first flow channel plate 11 and the second flow channel plate 12 may also be metal plates, and an insulating layer is provided on the inner wall surface of the heat dissipation channel 101 to achieve insulation from the busbar 2. For example, an insulating material is sprayed on the inner wall surface of the heat dissipation channel 101.

[0098] Alternatively, if Figure 1and Figure 8 As shown, there are multiple pole holes 104 and busbars 2 , and the multiple pole holes 104 are arranged along the length direction of the heat dissipation channel 101 .

[0099] Therefore, the heat sink 1 is used to integrate the plurality of bus bars 2 together, so that the plurality of bus bars 2 share the same heat sink 1, which is beneficial to simplifying the overall structure of the battery pack and reducing the cost of the battery pack.

[0100] like Figure 2 , Figure 6 and Figure 8 As shown, a portion of the busbars 2 is a first busbar, which is entirely embedded in the heat sink 1 and blocks two adjacent pole holes 104 .

[0101] For example, the first busbar is a series busbar 21, which includes two electrical connection parts 201, which are arranged at intervals along the length direction of the heat dissipation channel 101, and the two electrical connection parts 201 respectively block two adjacent pole holes 104. The series busbar 21 also includes a transition connection part, which is arranged between the two electrical connection parts 201. The two electrical connection parts 201 of the series busbar 21 are respectively electrically connected to the poles 2001 of two adjacent battery cells 20 to achieve the series connection between the two adjacent battery cells 20.

[0102] like Figure 3 , Figure 6 and Figure 8 As shown, another part of the busbar 2 is a second busbar, a part of which is embedded in the heat sink 1, and the second busbar blocks a pole hole 104, and another part of the second busbar extends out of the heat sink 1. The second busbar can be an input busbar or an output busbar.

[0103] For example, Figure 3 As shown, the second busbar is an input busbar 22, the electrical connection portion 201 of the input busbar 22 is electrically connected to the pole 2001 of one of the cells 20, and the input busbar 22 includes an input connection portion 221, which is used to electrically connect to other components, wherein the other components may be a power distribution system.

[0104] By setting a portion of the bus 2 as the first bus and another portion of the bus 2 as the second bus, both the first bus and the second bus are at least partially embedded in the heat sink 1, which is beneficial to further reduce the volume of the bus assembly 10 and improve the energy density of the battery pack.

[0105] Optionally, the input connection portion 221 has a plurality of bends.

[0106] The input row 22 may have only one bending portion before being integrally injection molded with the first flow channel plate 11. After the input row 22 is integrally injection molded with the first flow channel plate 11 and the first flow channel plate 11 is sealed and connected to the second flow channel plate 12, the position of the channel protrusion 123 is clamped by a clamp, and the input row 22 is bent to facilitate the molding of multiple bending portions on the input row 22.

[0107] The structure and manufacturing method of the output row may be the same as those of the input row 22 .

[0108] The busbar assembly 10 of the embodiment of the utility model embeds at least a portion of the busbar 2 into the heat sink 1, so that the busbar 2 is in direct contact with the cooling medium in the heat sink 1, thereby improving the cooling and heat dissipation capacity of the heat sink 1 to the busbar 2, while saving the layout space in the height direction of the battery pack, making the entire pack layout more compact. In addition, since the busbar 2 is protected by the heat sink 1 made of non-metallic materials, the insulation risk caused by thermal runaway and explosion of the battery cell can be reduced.

[0109] like Figures 9 to 11 As shown, the battery pack of the embodiment of the utility model includes a plurality of battery cells 20 and a bus assembly 10 , the battery cell 20 includes a pole 2001 , the bus assembly 10 is the bus assembly 10 described in any of the above embodiments, and the electrical connection portion 201 is electrically connected to the pole 2001 .

[0110] When welding the bus 2 and the pole 2001, the channel protrusion 123 of the second flow channel plate 12 is pressed by the tooling to make the bus 2 and the pole 2001 close together; then the laser is used to penetrate the second flow channel plate 12 and hit the electrical connection part 201 of the bus 2, avoiding the channel protrusion 123 and welding the bus 2 and the pole 2001 according to the set trajectory.

[0111] Since the busbar assembly 10 is relatively small in size, the battery pack of the embodiment of the utility model has the advantages of high energy density.

[0112] Optionally, the battery pack includes a box body and a battery module 100, such as Fig. 9As shown, the battery module 100 includes a plurality of battery cells 20 and two busbar assemblies 10. The two busbar assemblies 10 are arranged at intervals in the left-right direction, and the two poles 2001 of the battery cells 20 are arranged at intervals in the left-right direction, with the pole 2001 located on the left side being the left pole, and the pole 2001 located on the right side being the right pole. Among them, the electrical connection portion 201 of the busbar assembly 10 located on the left side corresponds to and is electrically connected to the left poles of the plurality of battery cells 20 one by one; the electrical connection portion 201 of the busbar assembly 10 located on the right side corresponds to and is electrically connected to the right poles of the plurality of battery cells 20 one by one. Both busbar assemblies 10 include a second busbar, one of which is an input busbar 22, and the other second busbar is an output busbar 23, and the input busbar 22 and the output busbar 23 are electrically connected to the positive and negative poles of the power distribution system, respectively, so as to realize power supply to other components.

[0113] The vehicle of the embodiment of the utility model comprises the battery pack described in any of the above embodiments, wherein the vehicle can be a pure electric vehicle or a hybrid electric vehicle.

[0114] Since the battery pack in the above-mentioned embodiment has advantages such as high energy density, the vehicle in the embodiment of the utility model has advantages such as long cruising range.

[0115] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A busbar assembly, characterized in that: include: A heat dissipation plate, wherein the heat dissipation plate is provided with a heat dissipation channel and a pole hole, wherein the pole hole is provided on one side of the heat dissipation channel in the thickness direction of the heat dissipation plate and is communicated with the heat dissipation channel; A bus bar, at least a portion of which is embedded in the heat sink, and the bus bar blocks the pole hole.

2. The busbar assembly according to claim 1, characterized in that: The pole hole comprises a pole opening facing the heat dissipation channel, a limiting protrusion is provided at the pole opening, and the limiting protrusion is used to embed the busbar.

3. The busbar assembly according to claim 2, characterized in that: The heat dissipation channel includes a first inner wall provided with the pole hole, a groove is formed between the limiting protrusion and the first inner wall, the notch of the groove faces the pole hole, and the busbar is embedded in the groove.

4. The busbar assembly according to claim 1, characterized in that: The heat dissipation channel comprises a second inner wall opposite to the pole hole, and the second inner wall is provided with a channel protrusion.

5. The busbar assembly according to claim 4, characterized in that: The orthographic projection of the channel protrusion in the direction toward the pole hole is located within the cross section of the pole hole; The channel protrusion stops at the bus bar, or the distance between the channel protrusion and the bus bar is less than or equal to 0.5 mm.

6. The busbar assembly according to any one of claims 1 to 5, characterized in that: Therefore, the heat sink includes a first flow channel plate and a second flow channel plate which are stacked, the first flow channel plate and the second flow channel plate are sealed and connected to form the heat dissipation channel, the pole hole is provided in the first flow channel plate, at least a part of the bus is embedded in the first flow channel plate, and the transmittance of the second flow channel plate is greater than or equal to 20%.

7. The busbar assembly according to any one of claims 1 to 5, characterized in that: The thickness of the portion of the busbar that blocks the pole hole is smaller than the thickness of the portion of the busbar that is embedded in the heat sink.

8. The busbar assembly according to any one of claims 1 to 5, characterized in that: The number of the pole holes and the number of the busbars are both multiple, and the multiple pole holes are arranged along the length direction of the heat dissipation channel; A portion of the busbars is a first busbar, the first busbar is entirely embedded in the heat sink, and the first busbar blocks two adjacent pole holes; Another part of the busbar is a second busbar, a part of the second busbar is embedded in the heat sink, and the second busbar blocks one of the pole holes, and another part of the second busbar extends out of the heat sink.

9. A battery pack, characterized in that: include: A plurality of battery cells, each of which comprises a pole; A busbar assembly, wherein the busbar assembly is the busbar assembly described in any one of claims 1 to 8, and the busbar is electrically connected to the pole.

10. A vehicle, characterized in that: A battery pack comprising the battery pack of claim 9.

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