Busbar, battery assembly, battery pack and new energy vehicle

Abstract

The battery assembly, the battery pack and the new energy vehicle provided by the present disclosure relate to the field of batteries. The busbar comprises a connecting row and a top plate, the connecting row and the top plate are connected, and a sealed cavity is formed between the connecting row and the top plate; the sealed cavity is provided with a capillary structure and a cooling liquid. The cooling liquid is used for absorbing heat of the connecting row and evaporating, the evaporated gas is condensed on the inner wall of the sealed cavity, and the condensed liquid flows back through the capillary structure. The busbar has a cooling function, realizes rapid heat dissipation of the busbar, and the cooling liquid can be recycled, thereby solving the problem of excessively high temperature rise of the busbar under the condition of large-rate charging and discharging.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more specifically, to a busbar, a battery module, a battery pack, and a new energy vehicle. Background Technology

[0002] To address the range anxiety issue of new energy vehicles, major manufacturers are competing to launch high-rate fast charging solutions, which can quickly charge the battery pack in a short time to meet customers' demands for charging speed.

[0003] However, under high-rate fast charging conditions, the battery cells generate more heat. Simultaneously, due to the increased charging current, the busbar connecting the positive and negative terminals of the series-connected battery cells also generates significant heat. Since the battery cell terminals are directly connected to the internal core's tabs via an intermediate adapter, the increased temperature of the busbar also affects the internal temperature of the battery cell. Current battery pack thermal management solutions mostly cool the bottom or sides of the battery cells, without considering cooling the busbar to achieve the same effect of cooling the battery cell terminals. Summary of the Invention

[0004] The present invention aims to provide, for example, a busbar, a battery assembly, a battery pack, and a new energy vehicle, which can achieve cooling of the busbar, and the busbar has high heat dissipation efficiency, which is beneficial to reducing the temperature of the battery cells.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a bus, comprising:

[0007] Connecting row;

[0008] A top plate is connected to the connecting bar, and a sealed cavity is formed between the top plate and the connecting bar;

[0009] The capillary structure has capillary channels inside and is located in the sealed cavity. Both ends of the capillary structure abut against the connecting bar and the top plate, respectively.

[0010] Coolant, wherein the coolant is disposed within the sealed cavity but does not fill the sealed cavity;

[0011] The sealed cavity is provided with a gas channel for gas to flow from the connection to the top plate.

[0012] In an optional embodiment, the top plate includes a top plate body and a connecting portion recessed relative to the top plate body, the connecting portion being fixedly connected to the connecting row, and the connecting portion being disposed on the periphery of the capillary structure.

[0013] In an optional embodiment, the busbar further includes a limiting strip; one end of the limiting strip is connected to the top layer plate, and the other end is connected to the connecting strip, and the limiting strip is disposed on the periphery of the capillary structure.

[0014] In an optional embodiment, the connecting portion is located on the side of the limiting strip away from the capillary structure.

[0015] In an optional embodiment, the top layer plate and the connecting strip are sealed together.

[0016] In an optional embodiment, the coolant fills the sealed cavity to 20% to 90% of its volume.

[0017] In an optional embodiment, the thermal conductivity of the limiting strip is lower than that of the top layer plate.

[0018] In an optional embodiment, the outer surface of the capillary structure and the inner wall of the sealing cavity together form the gas channel.

[0019] In an optional embodiment, one of the connecting bar and the top plate has a groove with its opening facing the other, and the other covers the opening of the groove so that the groove is used to form the sealing cavity, and the capillary structure is disposed in the groove.

[0020] In an optional embodiment, the connecting row is provided with a first groove, the top plate is provided with a second groove, the openings of the first groove and the second groove are opposite to each other, and the first groove and the second groove together form the sealing cavity;

[0021] One end of the capillary structure abuts against the bottom of the first groove, and the other end abuts against the bottom of the second groove.

[0022] In an optional embodiment, the sealing cavity may be an atmospheric pressure cavity or a negative pressure cavity.

[0023] In an optional embodiment, the capillary structure is made by powder sintering or by drilling or etching processes.

[0024] In an optional embodiment, the coolant is tetrafluoroethane or pure water.

[0025] In a second aspect, the present invention provides a battery assembly including a battery cell and a busbar as described in any of the foregoing embodiments, wherein the battery cell is provided with electrodes, and the busbar and the electrodes are electrically connected.

[0026] In an optional embodiment, each of the connection bars is connected to at least two electrodes of the battery cell, and the capillary structure is located between the two electrodes.

[0027] Thirdly, the present invention provides a battery pack, including a housing and a battery assembly as described in any of the foregoing embodiments, wherein the battery assembly is disposed within the housing.

[0028] Fourthly, the present invention provides a new energy vehicle, including the battery pack described above.

[0029] The beneficial effects of the embodiments of the present invention include, for example:

[0030] The busbar provided in this embodiment of the invention has a sealed cavity formed between the connecting busbar and the top plate. The sealed cavity contains a capillary structure and a coolant. The coolant absorbs heat from the connecting busbar and evaporates; the evaporated gas condenses on the inner wall of the sealed cavity, and the condensed liquid flows back through the capillary structure. This busbar has a cooling function, enabling rapid heat dissipation, and the coolant can be recycled, solving the problem of excessive temperature rise of the busbar under high-rate charge and discharge conditions, thereby achieving the purpose of cooling the battery cell terminals.

[0031] The battery assembly and battery pack provided in this embodiment of the invention include the busbar and battery cell described above. Since the busbar has a heat dissipation function, it is also beneficial to reduce the temperature of the battery cell, thereby achieving heat dissipation for the entire battery pack.

[0032] The new energy vehicle provided in this embodiment of the invention includes the battery pack described above. The battery pack has good heat dissipation performance and good temperature uniformity, and can achieve high-rate fast charging, thereby improving the charging speed. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the bus structure provided in an embodiment of the present invention;

[0035] Figure 2 This is an exploded structural diagram of a busbar provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the cross-sectional structure of the busbar provided in an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of the capillary structure of the busbar provided in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of a battery assembly provided in an embodiment of the present invention.

[0039] Icons: 100-Busbar; 110-Connector; 111-Groove; 120-Top Plate; 121-Top Plate Body; 123-Connector; 130-Capillary Structure; 131-Through Hole; 140-Structural Adhesive; 150-Limiting Strip; 200-Battery Component; 210-Cell; 220-Electrode. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0044] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0045] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0046] Under high-rate fast charging conditions, the battery cells generate a lot of heat, and the busbar temperature rises rapidly. The increase in busbar temperature also affects the internal temperature of the battery cells. Most current battery pack thermal management solutions cool the bottom or sides of the battery cells, but there are no solutions that directly cool the busbar.

[0047] To overcome at least one of the defects in the prior art, this embodiment provides a bus that can cool and dissipate heat from the bus, which is beneficial for reducing the temperature of the battery cell and enabling high-rate fast charging of the battery pack.

[0048] Please refer to Figures 1 to 4 This embodiment provides a busbar 100, including a connecting busbar 110 and a top plate 120. The top plate 120 is connected to the connecting busbar 110, and a sealed cavity is formed between the top plate 120 and the connecting busbar 110. A capillary structure 130 and coolant are provided within the sealed cavity. The coolant absorbs heat from the connecting busbar 110 and evaporates. The evaporated gas condenses on the inner wall of the sealed cavity, and the condensed liquid flows back through the capillary structure 130. This busbar 100 has a cooling function, enabling rapid heat dissipation from the busbar 100, and the coolant can be recycled. This solves the problem of excessive temperature rise of the busbar 100 under high-rate charge and discharge conditions, and is beneficial for reducing the cell temperature.

[0049] The capillary structure 130 is placed within the sealed cavity, specifically between the top plate 120 and the connecting row 110. Optionally, the capillary structure 130 contains capillary channels, with both ends of the capillary structure 130 abutting against the top plate 120 and the connecting row 110, respectively. This close fit between the capillary structure 130 and the top plate 120 and the connecting row 110 allows for better drainage of the condensed liquid. The capillary channels facilitate the return flow of the condensed liquid from the top plate 120 side to the connecting row 110 side.

[0050] In this embodiment, the coolant does not completely fill the sealed cavity; that is, the coolant level is at a predetermined distance from the surface of the top plate near the connecting bar. Optionally, the coolant fills the sealed cavity to 20% to 90% of its volume, which facilitates the condensation of the evaporated coolant upon reaching the top plate 120.

[0051] A gas channel is provided within the sealed cavity for gas to flow from the connecting row 110 to the top plate 120. Optionally, the outer surface of the capillary structure 130 and the inner wall of the sealed cavity form a gas channel to facilitate the flow of evaporated gas. It is easy to understand that the upper surface of the capillary structure 130 is in close contact with the top plate 120, the lower surface of the capillary structure 130 is in close contact with the connecting row 110, and the outer peripheral surface of the capillary structure 130 and the inner wall of the sealed cavity form a gas channel. If the capillary structure 130 has a cuboid structure, its outer peripheral surface includes four sides, at least one of which forms a gas channel with the inner wall of the sealed cavity. For example, if the capillary structure 130 is located in the middle of the sealed cavity, and its four sides are spaced apart from the inner wall of the sealed cavity, then each of the four sides forms a gas channel with the inner wall of the sealed cavity. Alternatively, if one or two of the four sides are in contact with the inner wall of the sealed cavity, then the remaining three or two sides form a gas channel with the inner wall of the sealed cavity.

[0052] Of course, the capillary structure 130 can also be a cylinder, an elliptical cylinder, a frustum, a prism, or any other shape; no specific limitation is made here.

[0053] The coolant in the sealed cavity absorbs heat from the connecting drain 110 and evaporates into gas. The gas rises from one side of the connecting drain 110 along the gas channel to the top plate 120, where it condenses into liquid. The liquid flows back from one side of the top plate 120 along the capillary channel to the connecting drain 110, thus realizing the circulation of coolant.

[0054] In this embodiment, the top plate 120 and the connecting strip 110 are bonded together. For example, using structural adhesive 140 can further improve the sealing performance of the sealing cavity. Of course, in other embodiments, other fixing methods can be used to connect the top plate 120 and the connecting strip 110. In addition, a sealing element can be provided between the top plate 120 and the connecting strip 110 to improve the sealing performance of the sealing cavity. It should be noted that, provided that the sealing performance of the connection between the top plate 120 and the connecting strip 110 is ensured, welding, snap-fitting, or other connection methods can also be used, which are not specifically limited here. Optionally, a limiting strip 150 is provided between the top plate 120 and the connecting strip 110. In this embodiment, there are multiple limiting strips 150, which are distributed around the periphery of the capillary structure 130. The limiting strip 150 serves to separate the top plate 120 and the connecting strip 110, which is beneficial for forming a sealing cavity between the connecting strip 110 and the top plate 120. Furthermore, the limiting strip 150 supports the top plate 120, preventing it from collapsing and contacting the connecting strip 110, thus improving the structural stability of the sealing cavity. Optionally, one end of the limiting strip 150 is connected to the top plate 120, and the other end is connected to the connecting strip 110. In this embodiment, the limiting strip 150 is bonded to both the top plate 120 and the connecting strip 110 using structural adhesive 140, resulting in a stable and reliable structure with good sealing performance.

[0055] The number of limiting strips 150 can be one or more, and their cross-sectional shape can be circular, square, elliptical, triangular, or any other arbitrary shape, without specific limitation. In this embodiment, there are two limiting strips 150, respectively disposed near both ends of the top plate 120, so that the supporting force on the top plate 120 is more uniform and the structure is more stable. The number of limiting strips 150 can also be three, four, five, or six, etc., without specific limitation.

[0056] Optionally, the top plate 120 includes a top plate body 121 and a connecting portion 123 recessed relative to the top plate body 121. The connecting portion 123 is fixedly connected to the connecting row 110 and is located on the periphery of the capillary structure 130. In this embodiment, the connecting portion 123 and the connecting row 110 are connected in a sealed manner. The connecting portion 123 is located on the side of the limiting strip 150 away from the capillary structure 130. This arrangement helps to improve the sealing performance of the sealing cavity.

[0057] Optionally, the thermal conductivity of the limiting strip 150 is lower than that of the top plate 120. It is understood that the limiting strip 150 is made of a non-metallic material with low thermal conductivity to prevent heat from the connecting strip 110 from being directly transferred from the limiting strip 150 to the top plate 120. This ensures a large temperature difference between the top plate 120 and the connecting strip 110. In this way, the heat on the connecting strip 110 is transferred to the top plate 120 via the capillary structure 130, allowing the top plate 120 to exchange heat with the outside environment, thus achieving the purpose of cooling the connecting strip 110. The heat on the connecting strip 110 exchanges heat through the sealed cavity and the top plate 120, resulting in high heat exchange efficiency and good heat exchange uniformity. In this embodiment, the connecting strip 110 is made of materials with good electrical conductivity, such as copper or aluminum, which have high thermal conductivity and fast heat transfer speed. The top plate 120 is made of a metallic material with high thermal conductivity, such as copper, aluminum, diamond, graphene, gold, silver, aluminum nitride, or silicon carbide.

[0058] Optionally, the limiting strip 150 adopts a hollow structure, which can not only provide support and limit, but also reduce the weight of the overall busbar 100. At the same time, it can also reduce the heat of the connecting busbar 110 from the limiting strip 150 to the top plate 120, ensuring a large temperature difference between the top plate 120 and the connecting busbar 110.

[0059] Of the connecting strip 110 and the top plate 120, one has a groove 111 with its opening facing the other, and the other covers the opening of the groove 111, so that the groove 111 is used to form a sealed cavity, and the capillary structure 130 is disposed within the groove 111. In other words, the groove 111 can be formed on either the connecting strip 110 or the top plate 120. If the groove 111 is formed on the connecting strip 110, the opening of the groove 111 faces the top plate 120, and the top plate 120 covers the opening of the groove 111, so that the groove 111 forms a closed sealed cavity. If the groove 111 is formed on the top plate 120, the opening of the groove 111 faces the connecting strip 110, and the connecting strip 110 covers the opening of the groove 111, so that the groove 111 forms a closed sealed cavity.

[0060] Optionally, the connecting strip 110 and the top plate 120 can each be provided with a groove 111. That is, the connecting strip 110 has a first groove, and the top plate 120 has a second groove. The openings of the first groove and the second groove are opposite to each other, and the first groove and the second groove together form a sealing cavity. In this embodiment, the shape and size of the first groove and the second groove are the same. Of course, in some other embodiments, the opening size, depth, etc. of the first groove and the second groove can also be different.

[0061] One end of the capillary structure 130 abuts against the bottom of the first groove, and the other end abuts against the bottom of the second groove. This ensures that the capillary structure 130 is in close contact with the connecting bar 110 and the top plate 120, respectively, thereby improving heat dissipation.

[0062] The capillary structure 130 is placed in the groove 111. By setting the groove 111, the thickness of the entire busbar 100 can be reduced, the volume can be reduced, and the space utilization can be improved. In addition, after opening the groove 111, the volume of the sealing cavity can be effectively increased, which is conducive to increasing the heat exchange area, thereby improving the heat exchange efficiency and meeting the cooling requirements of the connecting busbar 110.

[0063] As is easily understood, the groove 111 is located in the middle of the connecting bar 110, resulting in good structural symmetry and better heat exchange uniformity. The two ends of the connecting bar 110 are used for electrical connection with the battery cell or other electrical structures. The sealing cavity structure in the middle can meet the heat dissipation requirements of the entire connecting bar 110. Of course, this is not the only option; one or more sealing cavities can be provided on the connecting bar 110. For example, two sealing cavities can be provided, located at both ends of the connecting bar 110, or three sealing cavities can be provided, located at both ends and the middle of the connecting bar 110. This can further improve heat exchange efficiency, resulting in faster cooling of the connecting bar 110. Alternatively, the number of sealing cavities can be four, five, or even more; no specific limitation is made here.

[0064] Optionally, the sealing cavity can be either a normal pressure cavity or a negative pressure cavity. In this embodiment, if the sealing cavity is a negative pressure cavity, the negative pressure of the negative pressure cavity cannot be too low to prevent the coolant from vaporizing directly without absorbing heat in a low negative pressure environment. It is easy to understand that after the sealing cavity is subjected to negative pressure treatment, the boiling and vaporization temperature of the coolant in the negative pressure environment is lower than that in the normal pressure environment, which is conducive to the evaporation of the coolant, resulting in better heat exchange effect and better temperature uniformity, which is beneficial to achieving rapid cooling of the connecting drain 110.

[0065] In this embodiment, the capillary structure 130 is made by powder sintering, for example, by sintering at least one of copper powder and aluminum powder. Alternatively, the capillary structure 130 is made by etching. For example, the capillary structure 130 is a structure containing capillary channels made by etching corrosion-resistant metals such as copper, aluminum, or stainless steel. Optionally, the capillary structure 130 is a rectangular block with multiple through holes 131. The through holes 131 penetrate the rectangular block along its thickness direction, i.e., the axis of the through holes 131 points from the top plate 120 to the connecting row 110. This arrangement facilitates the return of coolant after the top plate 120 condenses to the bottom of the sealing cavity along the through holes 131. Of course, the axis of the through hole 131 can be a straight line, a curve, or a broken line, and the cross-sectional shape of the through hole 131 can be circular, elliptical, square, rhomboid, rectangular, or any shape. The axes of the multiple through holes 131 can be consistent or form a certain angle. The size of the multiple through holes 131 can be exactly the same or partially the same, or the multiple through holes 131 can be designed to be completely different. The distribution of the through holes 131 on the rectangular block can be a matrix array, or a row-to-row staggered arrangement, or a column-to-column staggered arrangement, or a ring array, or the multiple through holes 131 can be arranged irregularly. No specific limitation is made here.

[0066] The coolant used is tetrafluoroethane or pure water, which provides better cooling performance. Optionally, the coolant does not completely fill the sealed cavity. The bottom of the sealed cavity is the upper surface of the connecting bar 110, and the capillary structure 130 is disposed on the upper surface of the connecting bar 110 and is in close contact with it. The side of the capillary structure 130 away from the connecting bar 110 is in close contact with the top plate 120. There is a predetermined gap between the coolant level and the side of the top plate 120 near the connecting bar 110. Optionally, the coolant partially wets the capillary structure 130, as long as there is also a certain gap between the coolant level and the top plate 120, so that the evaporated coolant can condense after reaching the top plate 120.

[0067] The working principle of bus 100 is as follows:

[0068] Combination Figure 5The two ends of the connecting bus 110 are electrically connected to the electrodes 220 (terminals) of the battery cell 210 or other electrical structures. Current flows through the connecting bus 110, generating heat. This heat is absorbed by the coolant in the central sealed cavity. After absorbing heat, the coolant evaporates into gas, which flows through the capillary structure 130 to the top plate 120 under the action of pressure difference. Due to the large temperature difference between the top plate 120 and the connecting bus 110, the gaseous coolant condenses into liquid in the top plate 120. The liquid coolant drips down and flows back to the bottom of the sealed cavity along the through-holes 131 of the capillary structure 130, allowing the coolant to be recycled. The heat from the top plate 120 is dissipated into the outside air through convection. The coolant continuously absorbs heat and evaporates at the bottom of the sealed cavity, condenses in the top plate 120, and then flows back, achieving cooling and heat dissipation for the connecting bus 110.

[0069] This invention provides a battery assembly 200, including a battery cell 210 and a busbar 100 as described in any of the preceding embodiments. The battery cell 210 is provided with an electrode 220, and a connecting busbar 110 is electrically connected to the electrode 220 of the battery cell 210. It is understood that the electrode 220 of the battery cell 210 and the connecting busbar 110 are welded together to achieve electrical connection. It should be noted that the battery assembly 200 contains multiple battery cells 210. To achieve series and parallel connection of multiple battery cells 210, multiple busbars 100 are also connected to the battery cells 210. Each busbar 100 adopts the aforementioned busbar 100 with a sealed cavity and capillary structure 130. In this way, during the charging and discharging process, each busbar 100 can achieve rapid cooling, preventing excessive temperature rise of the busbar 100. This helps control all battery cells 210 to operate within a suitable temperature range, fully utilizing the excellent performance of the battery cells 210, and thus improving the stability of the entire battery assembly 200. When the battery assembly 200 is fast-charging at a high rate, it can cool the busbar 100 in time, effectively control the temperature of the cell 210, prevent the cell 210 from getting too hot, and improve charging efficiency.

[0070] It is understood that electrode 220 includes a positive electrode and a negative electrode. Each busbar 100 connects at least two electrodes 220 of the battery cells 210. If the polarities of the at least two connected electrodes 220 are the same, then at least two battery cells 210 are connected in parallel. If the polarities of the at least two connected electrodes 220 are different, then at least two battery cells 210 are connected in series. After the connecting busbar 110 and the battery cells 210 are connected, the capillary structure 130 is located between the two electrodes 220. In this way, when current passes through the busbar 100, the heat dissipation of the busbar 100 can be better improved, thus enhancing the cooling effect.

[0071] This invention also provides a battery pack, including a housing and the aforementioned battery assembly 200. The battery assembly 200 is disposed inside the housing. Due to the use of the aforementioned battery assembly 200, the entire battery pack has good heat dissipation and better temperature uniformity.

[0072] This invention also provides a new energy vehicle including the aforementioned battery pack. This battery pack is suitable for high-rate fast charging, effectively improving the vehicle's charging speed and meeting users' demands for charging speed. Furthermore, the battery pack can be controlled to operate within a suitable temperature range, effectively improving the vehicle's operational stability and reliability, and enhancing its market competitiveness.

[0073] In summary, the busbar 100, battery module 200, battery pack, and new energy vehicle provided by the embodiments of the present invention have the following beneficial effects, including:

[0074] The busbar 100 provided in this embodiment of the invention has a sealed cavity on the connecting busbar 110. The sealed cavity contains a capillary structure 130 and a coolant. The coolant absorbs heat from the connecting busbar 110 and evaporates; the evaporated gas condenses on the inner wall of the sealed cavity, and the condensed liquid flows back through the capillary structure 130. This busbar 100 has a cooling function, enabling rapid heat dissipation, and the coolant can be recycled. This solves the problem of excessive temperature rise of the busbar 100 under high-rate charge and discharge conditions, and also helps to reduce the temperature of the battery cell 210, filling a gap in the industry where there is no direct cooling for the busbar 100.

[0075] The battery assembly 200 and battery pack provided in this embodiment of the invention include the busbar 100 mentioned above. Since the busbar 100 has a heat dissipation function, it is also beneficial to reduce the temperature of the battery cell 210, thereby achieving heat dissipation for the entire battery pack. The heat dissipation speed is fast, the cooling efficiency is high, and the temperature uniformity of the entire battery pack is better.

[0076] The new energy vehicle provided in this embodiment of the invention includes the battery pack described above. The battery pack has good heat dissipation performance and good temperature uniformity, and can achieve high-rate fast charging, thereby improving the charging speed.

[0077] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A busbar, characterized in that The busbar comprises: a connection row; a top layer plate connected with the connection row, and a sealed cavity formed between the top layer plate and the connection row; a capillary structure provided with capillary channels inside, the capillary channels comprising a plurality of through holes with an axis direction pointing from the top layer plate to the connection row; the capillary structure is arranged in the sealed cavity, and two ends of the capillary structure abut against the connection row and the top layer plate respectively; cooling liquid arranged in the sealed cavity and not filling the sealed cavity; wherein the sealed cavity is provided with a gas channel for gas to flow from the connection row to the top layer plate; the outer surface of the capillary structure and the inner wall of the sealed cavity jointly form the gas channel; the top layer plate comprises a top layer plate body and a connection part recessed relative to the top layer plate body, the connection part is fixedly connected with the connection row, and the connection part is arranged at the periphery of the capillary structure; the busbar further comprises a limiting strip; one end of the limiting strip is connected with the top layer plate, the other end is connected with the connection row, and the limiting strip is arranged at the periphery of the capillary structure.

2. The busbar of claim 1, wherein The connection part is arranged on the side of the limiting strip away from the capillary structure.

3. The busbar of claim 1, wherein The thermal conductivity of the limiting strip is lower than that of the top layer plate.

4. The busbar of claim 1, wherein The cooling liquid fills 20% to 90% of the volume of the sealed cavity.

5. The busbar of claim 1, wherein Among the connection row and the top layer plate, one is provided with a groove facing the other, and the other covers the groove to form the sealed cavity, and the capillary structure is arranged in the groove.

6. The busbar of claim 1, wherein The connection row is provided with a first groove, the top layer plate is provided with a second groove, the groove opening of the first groove and the groove opening of the second groove are opposite to each other, and the first groove and the second groove jointly form the sealed cavity. One end of the capillary structure abuts against the groove bottom of the first groove, and the other end abuts against the groove bottom of the second groove.

7. The busbar of claim 1, wherein The sealed cavity adopts a normal pressure cavity or a negative pressure cavity.

8. A battery assembly characterized by, The battery pack comprises a cell having an electrode, and the busbar and the electrode are electrically connected.

9. The battery assembly of claim 8, wherein, Each connection row is connected with at least two electrodes of the cell, and the capillary structure is located between the two electrodes.

10. A battery pack, characterized by, The battery pack comprises a cell having an electrode, and the busbar and the electrode are electrically connected.

11. A new energy vehicle, characterized in that, Each connection row is connected with at least two electrodes of the cell, and the capillary structure is located between the two electrodes. The battery pack comprises a cell having an electrode, and the busbar and the electrode are electrically connected. Each connection row is connected with at least two electrodes of the cell, and the capillary structure is located between the two electrodes. The battery pack comprises a cell having an electrode, and the busbar and the electrode are electrically connected.

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