Battery pack and vehicle

Abstract

The application provides a battery pack and a vehicle, and relates to the technical field of vehicles.The battery pack comprises a battery cell group, a busbar assembly and a first cooling plate; the battery cell group comprises a plurality of battery cells, the plurality of battery cells are sequentially arranged along a first direction, the battery cell comprises an explosion-proof valve and two pole columns, the explosion-proof valve and the two pole columns are located at the top of the battery cell, two parallel busbar assemblies are arranged on the battery cell group, and the busbar assemblies are welded with the pole columns of adjacent battery cells; the first cooling plate is arranged on the busbar assembly, and the first cooling plate has an avoiding portion for avoiding the explosion-proof valve of the battery cell.The vehicle comprises the battery pack.By arranging the first cooling plate on the busbar assembly, the first cooling plate can cool the busbar assembly and the pole columns, so that the problem that the temperature of the busbar assembly and the pole columns of the battery cell is high can be avoided, and the vehicle can be charged at a high charging rate and can work at high power.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more particularly to a battery pack and a vehicle. Background Technology

[0002] With the government's vigorous promotion of new energy, electric vehicles have become the mainstream trend for the future. Among these components, the battery pack, as the most crucial power supply component of the vehicle, determines key indicators such as driving range, cost, lifespan, safety, and maintainability. During rapid charging and discharging, the battery pack generates a significant amount of heat. If this heat cannot be dissipated quickly and effectively, its accumulation can lead to safety accidents such as battery overheating, fire, and explosion.

[0003] In related technologies, a battery pack includes multiple battery cells. A liquid cooling plate is installed at the bottom of the multiple battery cells. The liquid cooling plate can be installed at the bottom of the multiple battery cells, between the large surfaces of the multiple battery cells, or between the sides of the multiple battery cells, so as to cool and dissipate heat from the battery pack. A busbar assembly is installed at the top of the multiple battery cells. The busbar assembly is welded to the terminals of the multiple battery cells, so as to facilitate the discharge of current inside the multiple battery cells.

[0004] However, when the battery pack is charged at a higher charging rate, the temperature of the busbar assembly and the terminal of the battery cell will be high. Summary of the Invention

[0005] This invention provides a battery pack and a vehicle to solve the problem of high terminal temperatures in the busbar assembly and battery cells when the battery pack is charged at a high charging rate.

[0006] On one hand, the present invention provides a battery pack, including a cell assembly, a busbar assembly, and a first cooling plate;

[0007] The battery cell assembly includes multiple battery cells arranged sequentially along a first direction. Each battery cell includes an explosion-proof valve and two terminals. The explosion-proof valve and the two terminals are located on the top of the battery cell. Two parallel bus assemblies are arranged on the battery cell assembly, and the bus assemblies are welded to the terminals of adjacent battery cells.

[0008] The first cooling plate is disposed on the busbar assembly. The first cooling plate has a clearance portion that avoids the explosion-proof valve of the battery cell. The first cooling plate is used to cool the busbar assembly and the terminal post.

[0009] Optionally, multiple sets of the battery cells are arranged sequentially along a second direction, wherein the first direction is perpendicular to the second direction.

[0010] Optionally, the first cooling plate includes a plurality of cooling sections, which are arranged sequentially at intervals in the second direction, and each cooling section corresponds to a column of the busbar assembly;

[0011] The clearance portion is the space between adjacent cooling portions.

[0012] Optionally, the cooling section is a harmonica tube type cooling section, the cooling section has a first end and a second end, the first end and the second end are arranged opposite to each other in the first direction, and the cooling section is provided with a plurality of cooling channels, the plurality of cooling channels are spaced apart in the second direction;

[0013] It also includes a first integrated tube and a second integrated tube, wherein the first integrated tube is connected to a first end of the plurality of cooling units, and the second integrated tube is connected to a second end of the plurality of cooling units.

[0014] Optionally, it further includes a first connector and a second connector. The first integrated tube includes a first part and a second part that are not connected. The first connector is disposed on the first part and is connected to the first part. The second connector is disposed on the second part and is connected to the second part. The first connector is used for the inflow of liquid cooling medium, and the second connector is used for the outflow of the liquid cooling medium.

[0015] Optionally, the cooling section is a flexible insulating cooling plate or a rigid insulating cooling plate.

[0016] Optionally, the cooling section is a phase change material cooling plate.

[0017] Optionally, a thermally conductive structural adhesive or thermally conductive pad is disposed between the first cooling plate and the busbar assembly.

[0018] Optionally, it also includes a fireproof strip disposed on the first cooling plate, the fireproof strip being used to prevent the insulation performance of the first cooling plate from deteriorating.

[0019] On the other hand, the present invention provides a vehicle including a chassis and a battery pack as described above;

[0020] The battery pack is mounted on the chassis.

[0021] The present invention provides a battery pack and a vehicle. By placing a first cooling plate on the busbar assembly, the first cooling plate has a relief part that avoids the explosion-proof valve of the battery cell. The first cooling plate cools the busbar assembly and the terminal post, thereby avoiding the problem of high temperature of the busbar assembly and the terminal post of the battery cell. This allows the vehicle to be charged at a higher charging rate and to operate under high power conditions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a first type of battery pack provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A partial exploded diagram of the battery pack;

[0025] Figure 3 for Figure 2 A schematic diagram of the battery cell structure in the diagram;

[0026] Figure 4 for Figure 2 An enlarged view of point A in the diagram;

[0027] Figure 5 for Figure 4 A schematic diagram of the main skeleton structure in the diagram;

[0028] Figure 6 for Figure 2 Partial schematic diagram;

[0029] Figure 7 for Figure 6 A schematic diagram of the cooling section in the middle;

[0030] Figure 8 This is a partial exploded view of the second type of battery pack provided in an embodiment of the present invention;

[0031] Figure 9 for Figure 8 Partial schematic diagram;

[0032] Figure 10 This is a partial exploded view of the third type of battery pack provided in an embodiment of the present invention;

[0033] Figure 11 for Figure 10 A schematic diagram of the structure of the first cooling plate in the middle.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10 - Cell pack; 11 - Cell;

[0036] 111-Explosion-proof valve; 112-Pole post;

[0037] 20 - Busbar assembly; 21 - Main frame;

[0038] 211-Through hole; 22-Manifold;

[0039] 30 - First cooling plate; 301 - Clearance section;

[0040] 31-Cooling section; 311-First end;

[0041] 312 - Second end; 313 - Cooling channel;

[0042] 321 - First integrated transistor; 3211 - First part;

[0043] 3212 - Part Two; 322 - Second Integrated Pipe;

[0044] 331 - First connector; 332 - Second connector;

[0045] 34-Fireproof strip; 35-Second cooling plate. Detailed Implementation

[0046] 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, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] In related technologies, a battery pack includes multiple battery cells. A liquid cooling plate is installed at the bottom of each cell, either at the bottom, between the large surfaces of the cells, or between the sides of the cells, to cool the battery pack. A busbar assembly is located on top of the cells and is welded to the terminals of the cells to facilitate the discharge of current from the cells. However, when the battery pack is charged at a high charging rate, the temperature of the busbar assembly and terminals rises sharply. The currently installed liquid cooling plate alone cannot effectively cool the busbar assembly and terminals, resulting in high temperatures at both the busbar assembly and the cell terminals.

[0052] To address the aforementioned issues, the present invention provides a battery pack and a vehicle. By placing a first cooling plate on the busbar assembly, the first cooling plate has a clearance portion for the explosion-proof valve of the battery cell. The first cooling plate cools the busbar assembly and the terminal posts, thereby avoiding the problem of high temperatures in the busbar assembly and the terminal posts of the battery cells. This allows the vehicle to be charged at a higher charging rate and to operate under high power conditions.

[0053] The battery pack and vehicle provided in the embodiments of the present invention will be described in detail below with reference to specific examples.

[0054] Figure 1 This is a schematic diagram of the structure of a first type of battery pack provided in an embodiment of the present invention; Figure 2 for Figure 1 A partial exploded diagram of the battery pack; Figure 3 for Figure 2 A schematic diagram of the battery cell structure in the diagram; Figure 4 for Figure 2 An enlarged view of point A in the diagram; Figure 5 for Figure 4 A schematic diagram of the main skeleton structure in the diagram; Figure 6 for Figure 2 Partial schematic diagram; Figure 7 for Figure 6 A schematic diagram of the cooling section is shown. It should be noted that... Figure 2 The top cover 40 and the bottom plate 50 are not shown in the diagram.

[0055] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a battery pack, including a cell assembly 10, a busbar assembly 20, and a first cooling plate 30. The battery pack also includes an upper cover 40 and a bottom plate 50, with the cell assembly 10, the busbar assembly 20, and the first cooling plate 30 integrated between the upper cover 40 and the bottom plate 50.

[0056] The battery cell assembly 10 includes multiple battery cells 11 arranged sequentially along a first direction. Each battery cell 11 includes an explosion-proof valve 111 and two terminals 112, with the explosion-proof valve 111 and the two terminals 112 located on top of the battery cell 11. Two parallel bus assemblies 20 are disposed on the battery cell assembly 10, and the bus assemblies 20 are welded to the terminals 112 of adjacent battery cells 11.

[0057] like Figure 2 and Figure 6 As shown, the first cooling plate 30 is disposed on the busbar assembly 20. The first cooling plate 30 has a clearance part 301 for avoiding the explosion-proof valve 111 of the battery cell 11. The first cooling plate 30 is used to cool the busbar assembly 20 and the terminal 112.

[0058] The battery pack can be rectangular in shape. The first direction can be the length of the battery pack.

[0059] The number of battery cells 11 in the battery cell assembly 10 can be set according to actual needs. The top of the battery cell 11 has an explosion-proof valve 111 and two pole posts 112.

[0060] The explosion-proof valve 111 is located between the two terminals 112 of the battery cell 11. The explosion-proof valve 111 can cut off the current circuit when the internal pressure in the battery cell 11 is high. The explosion-proof valve 111 can also release the internal pressure of the battery cell 11 when the internal pressure in the battery cell 11 is high by being broken.

[0061] The two bus assemblies 20 of the battery cell assembly 10 are arranged in parallel, and both bus assemblies 20 extend along a first direction. The bus assemblies 20 are used to conduct current from inside the battery cell assembly 10.

[0062] like Figure 4 and Figure 5 As shown, the bus assembly 20 includes a frame body 21 and a bus plate 22. The frame body 21 is provided with a through hole 211 through which the terminal post 112 passes. The bus plate 22 is welded to the terminal post 112 of the adjacent cell 11.

[0063] The main frame 21 can be made of high-strength plastic. Alternatively, the main frame 21 can be made of other high-strength materials.

[0064] The frame body 21 has space to accommodate the busbar 22. The frame body 21 and the battery cell 11 can be fixedly connected by structural adhesive. The frame body 21 and the top cover 40 can be fixedly connected by structural adhesive or thermal riveting.

[0065] The busbar 22 can be made of aluminum or copper. Insulation treatment is required before and after welding the busbar 22 to the terminal 112 of the battery cell 11.

[0066] The first cooling plate 30 has a clearance portion 301 to avoid the explosion-proof valve 111 of the battery cell 11, thereby ensuring that the use of the explosion-proof valve 111 is not affected. The clearance portion 301 can be a hollow structure or a thin plate that is easily burned through after thinning.

[0067] It should be noted that the first cooling plate 30 can reduce its weight by passing through the clearance part 301, thereby reducing the weight of the battery pack and lowering the cost of the battery pack.

[0068] The shape of the first cooling plate 30 is not specifically defined here. The first cooling plate 30 is disposed between the upper cover 40 and the busbar assembly 20, and the busbar assembly 20 can support the first cooling plate 30.

[0069] The first cooling plate 30 is located within the space enclosed by the main frame 21 and the upper cover 40. The first cooling plate 30 can cool the busbar assembly 20 and the terminal 112 through a liquid cooling medium, or through cold air, or through a phase change material.

[0070] It should be noted that the first cooling plate 30 can not only cool the busbar assembly 20 and the terminal 112, but also cool the inside of the battery cell 11. For example, it can cool the connecting pieces inside the battery cell 11.

[0071] The top cover 40 is a commonly used top cover in the battery pack industry, and its specific structure will not be described in detail here.

[0072] The base plate 50 is a commonly used base plate in the battery pack field, and its specific structure will not be described in detail here.

[0073] The battery pack provided in this embodiment of the invention cools the busbar assembly 20 and the terminal post 112 by using the first cooling plate 30, thereby avoiding the problem of high temperature of the busbar assembly 20 and the terminal post 112 of the cell 11. This allows the vehicle to be charged at a higher charging rate and to operate under high power.

[0074] Optionally, such as Figure 1 and Figure 2 As shown, the battery pack includes multiple sets of battery cells 10, which are arranged sequentially along a second direction. The first direction is perpendicular to the second direction.

[0075] The second direction can be the width direction of the battery pack. The number of cell groups 10 in the second direction can be set according to actual needs.

[0076] Each group of battery cells 10 is provided with two parallel bus assemblies 20, which extend along a first direction.

[0077] The first cooling plate 30 can be composed of multiple cooling sections 31 or a single plate; no specific configuration is provided here.

[0078] When the first cooling plate 30 is composed of a plurality of cooling sections 31, each cooling section 31 corresponds to a row of busbars 20, each cooling section 31 extends along a first direction, the plurality of cooling sections 31 are spaced apart in a second direction, and the clearance section 301 is the space between adjacent cooling sections 31.

[0079] When the first cooling plate 30 is a single piece of plate, the area of ​​the first cooling plate 30 corresponding to the busbar assembly 20 is the cooling area, which cools down the busbar assembly 20 and the pole 112. The area of ​​the first cooling plate 30 corresponding to the explosion-proof valve 111 is a thin plate that is easily burned through after thinning, and this thin plate is the clearance part 301.

[0080] Optionally, such as Figure 6 and Figure 7 As shown, the first cooling plate 30 includes a plurality of cooling sections 31, which are spaced apart in a second direction. Each cooling section 31 extends along a first direction. The cooling section 31 is a harmonica tube type cooling section. The cooling section 31 has a first end 311 and a second end 312, which are arranged opposite to each other in the first direction. The cooling section 31 is provided with a plurality of cooling channels 313, which are spaced apart in the second direction.

[0081] The cooling section 31 can be rectangular in shape. Adjacent cooling sections 31 may or may not be connected.

[0082] The cooling channel 313 can be square in shape. In other cases, the cooling channel 313 can also be other shapes.

[0083] Adjacent cooling channels 313 on each cooling section 31 are not connected. Liquid cooling medium can be introduced into the cooling channels 313.

[0084] The two ends of the cooling channel 313 can be either open or closed; no specific settings will be provided here.

[0085] When the cooling channel 313 is not closed, the liquid cooling medium outside the battery pack flows into the cooling channel 313, and the liquid medium in the cooling channel 313 can flow out into the liquid cooling medium outside the battery pack, which allows the liquid medium in the cooling channel 313 to exchange with the liquid cooling medium outside the battery pack.

[0086] When the cooling channel 313 is closed, the liquid cooling medium in the cooling channel 313 can be a liquid cooling medium with a large heat capacity. The liquid cooling medium in the cooling channel 313 does not exchange with the liquid cooling medium outside the battery pack. Utilizing the characteristic of the large heat capacity of the liquid cooling medium, it can absorb the heat of the bus assembly 20 and the terminal 112 in a short time, thereby suppressing the excessive temperature of the bus assembly 20 and the terminal 112.

[0087] Furthermore, such as Figure 6 and Figure 7 As shown, the cooling section 31 can be a flexible insulating cooling plate. This configuration can prevent short circuits between the first cooling plate 30 and the cell assembly 10, thereby improving the safety of the battery pack.

[0088] The flexible insulating cooling plate is mainly made of non-metallic materials.

[0089] Specifically, flexible insulating cooling plates can be formed by integral injection molding of non-metallic materials with insulating protective materials.

[0090] Flexible insulating cooling plates can also be formed by injection molding non-metallic materials and then adding insulating protective materials to the outside of the molded surface.

[0091] A flexible insulating cooling plate can also be formed by integrally injection molding a flat plate and a plate with flow channels by adding insulating and protective materials to non-metallic materials, and then using a non-metallic welding process to form the flat plate and the plate with flow channels.

[0092] In one optional embodiment, the cooling section 31 is a flexible insulating cooling plate, supported by the frame body 21 of the busbar assembly 20. This reduces the stress on the busbar plate 22. The cooling section 31 utilizes its own flexibility to fit tightly against the busbar assembly 20, thereby cooling both the busbar assembly 20 and the terminal 112. It should be noted that in this embodiment, the cooling section 31 is tightly fitted to the busbar assembly 20.

[0093] In another optional embodiment, the cooling section 31 is a flexible insulating cooling plate, supported by the main frame 21 of the busbar assembly 20, which reduces the stress on the busbar plate 22. The cooling section 31 utilizes its flexibility to fit tightly against the busbar assembly 20, and a thermally conductive structural adhesive is provided in the gap between the cooling section 31 and the busbar assembly 20. The cooling section 31 can cool the busbar assembly 20 and the terminal 112 through the thermally conductive structural adhesive. It should be noted that in this embodiment, there is a gap between the cooling section 31 and the busbar assembly 20.

[0094] Furthermore, the cooling section 31 is provided with a plurality of curved segments 314, which are spaced apart in the second direction. This arrangement enhances the stability of the cooling section 31 within the busbar assembly 20 through the plurality of curved segments 314.

[0095] Specifically, the shape of the curved segment 314 remains unchanged. By increasing the strength of the cooling portion 31 at the curved segment 314, the shape of the curved segment 314 can remain unchanged. In some examples, by increasing the thickness of the cooling portion 31 at the curved segment 314, the strength at the curved segment 314 can be increased, thus maintaining the shape of the curved segment 314.

[0096] Figure 8 This is a partial exploded view of the second type of battery pack provided in an embodiment of the present invention; Figure 9 for Figure 8 Partial schematic diagram. Figure 8 The battery pack in Figure 1 Compared to the battery pack, the first cooling plate 30 is made of a different material, but the other parts are the same.

[0097] Optionally, the cooling section 31 can be a rigid insulated cooling plate.

[0098] The rigid insulating cooling plate is made of metal.

[0099] Specifically, a rigid insulating cooling plate can be formed by injection molding of metal materials and then performing surface insulation protection treatment after molding.

[0100] Two flat plates are formed by injection molding of metal materials. One of the flat plates is stamped to form a plate with flow channels. Then, the unstamped flat plate and the plate with flow channels are brazed together and their surfaces are insulated and protected to form a rigid insulating cooling plate.

[0101] In other implementations, rigid insulating cooling plates can also be formed using a blow-blowing process.

[0102] In one optional embodiment, the cooling section 31 is a rigid insulating cooling plate, and the cooling section 31 is supported by the frame body 21 of the bus assembly 20, which can reduce the stress on the busbar 22. Thermally conductive structural adhesive is provided in the gap between the cooling section 31 and the bus assembly 20. The cooling section 31 can cool the bus assembly 20 and the terminal 112 through the thermally conductive structural adhesive, thereby enabling the cooling section 31 to effectively cool the bus assembly 20 and the terminal 112.

[0103] It should be noted that a thermal pad can also be provided in the gap between the cooling section 31 and the busbar assembly 20. The cooling section 31 can cool the busbar assembly 20 and the terminal 112 through the thermal pad.

[0104] Optionally, such as Figure 2 and 6 As shown, the battery pack also includes a first integrated tube 321 and a second integrated tube 322. The first integrated tube 321 is connected to the first end 311 of the plurality of cooling sections 31, and the second integrated tube 322 is connected to the second end 312 of the plurality of cooling sections 31.

[0105] The first integrated tube 321 can be a plastic rigid tube or a metal rigid tube; no specific configuration is specified here. When the material of the first integrated tube 321 is the same as that of the cooling unit 31, they can be connected together by welding. When the material of the first integrated tube 321 is different from that of the cooling unit 31, the first integrated tube 321 can be connected to the cooling unit 31 by a connector.

[0106] The second integrated tube 322 can be a plastic rigid tube or a metal rigid tube; specific configuration is not specified here. When the material of the second integrated tube 322 is the same as that of the cooling unit 31, they can be connected together by welding. When the material of the second integrated tube 322 is different from that of the cooling unit 31, the second integrated tube 322 can be connected to the cooling unit 31 by a connector.

[0107] When a liquid cooling medium is provided in the cooling channel 313, the liquid cooling medium in the cooling channel 313 can flow into the first integrated pipe 321 and the second integrated pipe 322, and the liquid cooling medium in the first integrated pipe 321 and the second integrated pipe 322 can flow into the cooling channel 313.

[0108] The liquid coolant in cooling channel 313 may not need to be exchanged with the liquid coolant outside the battery pack. In other implementations, the liquid coolant in cooling channel 313 may also be exchanged with the liquid coolant outside the battery pack.

[0109] In one preferred embodiment, when the first integrated pipe 321 and the second integrated pipe 322 are respectively connected to the liquid cooling medium outside the battery pack, the liquid cooling medium outside the battery pack flows into the cooling channel 313 through the first integrated pipe 321, and the liquid medium in the cooling channel 313 can flow out into the liquid cooling medium outside the battery pack through the second integrated pipe 322, so that the liquid medium in the cooling channel 313 can exchange with the liquid cooling medium outside the battery pack.

[0110] In another alternative embodiment, when neither the first integrated tube 321 nor the second integrated tube 322 is connected to the liquid cooling medium outside the battery pack, the liquid cooling medium in the cooling channel 313 can be a liquid cooling medium with a large heat capacity. The liquid cooling medium in the cooling channel 313 does not exchange with the liquid cooling medium outside the battery pack. Utilizing the large heat capacity of the liquid cooling medium, it can absorb the heat of the bus assembly 20 and the terminal 112 in a short time, thereby suppressing the excessive temperature of the bus assembly 20 and the terminal 112.

[0111] Furthermore, such as Figure 2 and Figure 6 As shown, the battery pack also includes a first connector 331 and a second connector 332. The first integrated tube 321 includes a first part 3211 and a second part 3212 that are not connected. The first connector 331 is disposed on the first part 3211 and is connected to the first part 3211. The second connector 332 is disposed on the second part 3212 and is connected to the second part 3212. The first connector 331 is used for the inflow of liquid cooling medium, and the second connector 332 is used for the outflow of liquid cooling medium.

[0112] The first ends 311 of all cooling units 31 connected to the first part 3211 are connected through the first part 3211. The first ends 311 of all cooling units 31 connected to the second part 3212 are connected through the second part 3212. The second ends 312 of all cooling units 31 connected to the second integrated pipe 322 are connected through the second integrated pipe 322.

[0113] The first connector 331 can be a plastic connector or a metal connector; no specific designation is given here. The material of the first connector 331 can be the same as that of the first integrated pipe 321. The first connector 331 and the first integrated pipe 321 can be connected together by welding.

[0114] The second connector 332 can be a plastic connector or a metal connector; specific details are not provided here. The material of the second connector 332 can be the same as that of the first integrated tube 321. The second connector 332 and the first integrated tube 321 can be connected together by welding.

[0115] The first connector 331 and the second connector 332 are respectively connected to the liquid cooling medium outside the battery pack. The liquid cooling medium outside the battery pack flows into the cooling channel 313 through the first connector 331 and the first part 3211. The liquid medium in the cooling channel 313 can flow out into the liquid cooling medium outside the battery pack through the second connector 332 and the second part 3212, so that the liquid medium in the cooling channel 313 can be exchanged with the liquid cooling medium outside the battery pack.

[0116] Figure 10 This is a partial exploded view of the third type of battery pack provided in an embodiment of the present invention; Figure 11 for Figure 10 A schematic diagram of the structure of the first cooling plate in the middle. Figure 10 The battery pack in Figure 1 Compared to the battery pack in the previous embodiment, the first cooling plate 30 is made of a different material. In this embodiment, the first cooling plate 30 does not have a cooling channel, and it does not have a first connector, a second connector, a first integrated tube, or a second integrated tube. All other parts are the same.

[0117] Optionally, such as Figure 10 and Figure 11 As shown, the first cooling plate 30 includes a plurality of cooling sections 31, which are spaced apart in a second direction. Each cooling section 31 extends along a first direction and is a phase change material cooling plate.

[0118] The phase change material cooling plate is made of a material capable of absorbing heat through solid-liquid phase change. The cooling section 31 can cool the busbar assembly 20 and the electrode column 112 by absorbing heat through solid-liquid phase change.

[0119] A fixing film is provided on the outer surface of the cooling section 31. The fixing film is used to prevent the cooling section 31 from flowing into the cell assembly 10 after it turns into a liquid state.

[0120] In one alternative embodiment, the cooling section 31 is a phase change material cooling plate. The cooling section 31 is supported by the main frame 21 of the busbar assembly 20, which can reduce the stress on the busbar plate 22. The cooling section 31 absorbs heat through solid-liquid phase change, which can cool down the busbar assembly 20 and the pole 112.

[0121] Optionally, such as Figure 2As shown, the battery pack also includes a fireproof strip 34, which is disposed on the first cooling plate 30. The fireproof strip 34 is used to prevent the insulation performance of the first cooling plate 30 from deteriorating. This arrangement ensures that in the event of thermal runaway of the battery pack, the fireproof strip 34 can prevent high-temperature splashes after the cell 11's spray valve from causing ablation of the first cooling plate 30, thereby preventing a deterioration in the insulation performance of the first cooling plate 30.

[0122] The fireproof strip 34 is located between the upper cover 40 and the first cooling plate 30, and the fireproof strip 34 can be made of flame-retardant material.

[0123] Specifically, the first cooling plate 30 includes multiple cooling sections 31, which are spaced apart in a second direction. Each cooling section 31 extends along a first direction and corresponds to a fireproof strip 34. There is a space between adjacent fireproof strips 34, which corresponds to the clearance section 301 of the first cooling plate 30.

[0124] Optionally, such as Figure 1 As shown, the battery also includes a second cooling plate 35, which is used to cool the cell pack 10.

[0125] The specific location of the second cooling plate 35 is not specified here. In some examples, the second cooling plate 35 can be located at the bottom of the cell assembly 10 or between the large surfaces of the cell 11. By simultaneously cooling the cell assembly 10 and the busbar assembly 20 with the first cooling plate 30 and the second cooling plate 35, the vehicle can be charged at a higher charging rate and operate under high power conditions.

[0126] The second cooling plate 35 can be made of metal.

[0127] The cooling method used by the second cooling plate 35 is not specifically configured. In some examples, the second cooling plate 35 can use liquid cooling or air cooling to cool the cell assembly 10.

[0128] In one feasible embodiment, a second cooling plate 35 may be disposed at the bottom of the cell assembly 10, located between the cell assembly 10 and the base plate 50. The second cooling plate 35 and the cell assembly 10 may be fixedly connected by structural adhesive. The second cooling plate 35 and the base plate 50 may be fixedly connected by structural adhesive or by thermal riveting.

[0129] This invention provides a vehicle, including a chassis and a battery pack. The battery pack is mounted on the chassis.

[0130] The battery pack in this embodiment has the same structure as the battery pack provided in any of the above embodiments and can bring the same or similar technical effects. It will not be described in detail here. For details, please refer to the description of the above embodiments.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that, It includes a battery cell assembly, a busbar assembly, a first cooling plate, a first integrated tube, a second integrated tube, a first connector, and a second connector; The battery cell assembly includes multiple battery cells, which are arranged sequentially along a first direction, and multiple battery cell assemblies are arranged sequentially along a second direction, wherein the first direction is perpendicular to the second direction; The battery cell includes an explosion-proof valve and two terminals. The explosion-proof valve and the two terminals are located on the top of the battery cell. Two parallel bus assemblies are provided on the battery cell assembly. The bus assemblies are welded to the terminals of adjacent battery cells. The first cooling plate is disposed on the busbar assembly. The first cooling plate has a clearance portion that avoids the explosion-proof valve of the battery cell. The first cooling plate is used to cool the busbar assembly and the terminal post. The first cooling plate includes a plurality of cooling sections, which are arranged sequentially at intervals in the second direction. Each cooling section corresponds to a column of the busbar assembly, and the clearance portion is the space between adjacent cooling sections. The cooling section is a harmonica tube type cooling section, which has a first end and a second end. The first end and the second end are arranged opposite to each other in the first direction. The cooling section is provided with multiple cooling channels, which are spaced apart in the second direction. The first integrated tube is connected to the first end of the plurality of cooling units, and the second integrated tube is connected to the second end of the plurality of cooling units; The first integrated tube includes a first part and a second part that are not connected. The first connector is disposed on the first part and is connected to the first part. The second connector is disposed on the second part and is connected to the second part. The first connector is used for the inflow of liquid cooling medium, and the second connector is used for the outflow of the liquid cooling medium.

2. The battery pack according to claim 1, characterized in that, The cooling section is a flexible insulating cooling plate or a rigid insulating cooling plate.

3. The battery pack according to claim 1, characterized in that, The cooling section is a phase change material cooling plate.

4. The battery pack according to any one of claims 1-2, characterized in that, A thermally conductive structural adhesive or thermally conductive pad is disposed between the first cooling plate and the busbar assembly.

5. The battery pack according to any one of claims 1-3, characterized in that, It also includes a fireproof strip, which is installed on the first cooling plate and is used to prevent the insulation performance of the first cooling plate from deteriorating.

6. A vehicle, characterized in that, Includes a chassis and a battery pack as described in any one of claims 1-5; The battery pack is mounted on the chassis.

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