Battery pack

Abstract

The utility model belongs to a battery pack in the technical field of power batteries. Comprising a plurality of battery cell groups, a cooling bottom plate, a cooling partition plate, a cooling pipe and a cooling end beam, and a first cooling runner is arranged in the cooling bottom plate; second cooling runners are arranged in the cooling partition plates, the battery cell groups are placed on the cooling bottom plate, and the cooling partition plates are arranged between at least part of adjacent battery cell groups; the cooling end beam is arranged on the cooling bottom plate and fixedly connected with the cooling partition plate and the cooling bottom plate, and the first cooling flow channel in the cooling bottom plate and the second cooling flow channel in the cooling partition plate are communicated in parallel or in series through the cooling end beam and the cooling pipe. The first cooling flow channel in the cooling bottom plate and the second cooling flow channel in the cooling partition plate are communicated in parallel or in series through the cooling pipe and the cooling end beam, the communication layout mode is flexible, the number of medium conveying pipelines and pipe nozzle connectors can be reduced, the number of parts can be reduced, the structure is simplified, and the cost is reduced. The space utilization rate and the energy density of the battery pack are improved.

Description

Technical Field

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

[0002] The battery cells of the battery pack will emit heat during use. In order to ensure the stable operation of the battery pack, a cooling system is generally required in the battery pack to improve the heat dissipation effect of the battery pack. At present, the traditional cooling system has many pipes. Although it can achieve heat dissipation, it has a complex structure and occupies a large space, which reduces the space utilization rate of the battery pack and the energy density of the battery pack. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a battery pack for solving the problem of complex cooling system structure and large space occupation of the battery pack in the prior art, so as to improve the space utilization and energy density of the battery pack.

[0004] To achieve the above-mentioned and other related purposes, the utility model provides a battery pack, comprising: a plurality of battery cell groups;

[0005] A cooling bottom plate, wherein a first cooling channel is provided in the cooling bottom plate;

[0006] A cooling baffle, wherein a second cooling channel is provided in the cooling baffle, the battery cell groups are placed on the cooling bottom plate, and the cooling baffle is provided between at least some adjacent battery cell groups;

[0007] cooling tubes; and

[0008] A cooling end beam is placed on the cooling base plate and fixedly connected to the cooling baffle and the cooling base plate. The first cooling channel in the cooling base plate and the second cooling channel in the cooling baffle are connected in parallel or in series through the cooling end beam and the cooling pipe.

[0009] Optionally, the cooling base plate is further provided with a first collecting chamber and a second collecting chamber separated from each other and connected to the first cooling channel, and the cooling end beam is provided with a third collecting chamber and a fourth collecting chamber separated from each other and connected to the second cooling channel. One of the first collecting chamber and the third collecting chamber can be externally connected to a first inlet and outlet liquid pipe, and the other can be externally connected to a second inlet and outlet liquid pipe. The second collecting chamber and the fourth collecting chamber are connected via the cooling pipe to connect the first cooling channel and the second cooling channel in series.

[0010] Optionally, the cooling base plate is further provided with a first collecting chamber and a second collecting chamber separated from each other and connected to the first cooling channel, the cooling end beam is provided with a third collecting chamber and a fourth collecting chamber separated from each other and connected to the second cooling channel, the first collecting chamber and the third collecting chamber are respectively connected to a first inlet and outlet liquid pipe through the cooling pipe, and the second collecting chamber and the fourth collecting chamber are respectively connected to a second inlet and outlet liquid pipe through the cooling pipe.

[0011] Optionally, the first inlet and outlet liquid ends of the first cooling channel are connected to the first collecting cavity, and the second inlet and outlet liquid ends of the first cooling channel are connected to the second collecting cavity; the third inlet and outlet liquid ends of the second cooling channel are connected to the third collecting cavity, and the fourth inlet and outlet liquid ends of the second cooling channel are connected to the fourth collecting cavity.

[0012] Optionally, the cooling end beam and the cooling baffle are located on the first side of the cooling base plate, the cooling base plate includes a main board body provided with a first cooling channel, a current collecting plate body is provided on the side wall of the first side of the main board body, and the current collecting plate body cooperates with part of the side wall of the first side of the main board body to define the first collecting cavity.

[0013] Optionally, a first liquid inlet and outlet is provided on the first side of the main board body, and the first liquid inlet and outlet end of the first cooling channel is connected to the first manifold through the first liquid inlet and outlet.

[0014] Optionally, a first cavity formed as the second manifold is provided in the main board body.

[0015] Optionally, the cooling end beam has a second cavity in it, and a partition is installed in the second cavity, and the partition can separate the second cavity to form the third manifold and the fourth manifold that are independent and distributed along the height direction of the cooling end beam.

[0016] Optionally, a plurality of battery cell groups are arranged side by side, and the cooling baffles are arranged on both sides of the battery cell groups along the side-by-side direction.

[0017] Optionally, the third collecting chamber and the fourth collecting chamber extend respectively along the side-by-side direction of the multiple groups of battery cell groups, the third liquid inlet and outlet ends of the second cooling channels of the multiple cooling baffles are connected to the same third collecting chamber, and the fourth liquid inlet and outlet ends of the second cooling channels of the multiple cooling baffles are connected to the same fourth collecting chamber.

[0018] Optionally, a plurality of cooling units are provided in the cooling base plate, each of the cooling units includes one or more of the first cooling channels, and the plurality of cooling units are distributed along the side-by-side direction of the plurality of battery cell groups; the first collecting chamber and the second collecting chamber extend along the side-by-side direction of the plurality of battery cell groups respectively, and the first inlet and outlet liquid ends of the plurality of the first cooling channels of the plurality of the cooling units are connected to the same first collecting chamber, and the second inlet and outlet liquid ends of the plurality of the first cooling channels of the plurality of the cooling units are connected to the same second collecting chamber.

[0019] Optionally, the cooling baffle comprises a stamped plate, an aluminum extruded harmonica tube or a profile plate; the cooling base plate comprises a stamped plate, an aluminum extruded harmonica tube or a profile plate.

[0020] As described above, the battery pack of the utility model has at least the following beneficial effects: the cooling base plate and the cooling baffle cooperate to cool the battery cell group, which is beneficial to improving the cooling effect and thus improving the heat dissipation performance; based on this, the first cooling channel in the cooling base plate and the second cooling channel in the cooling baffle are connected in parallel or in series through the cooling pipe and the cooling end beam, and the connection layout is flexible and helps to reduce the number of medium delivery pipelines and nozzle joints, thereby helping to reduce the number of components, simplify the structure, and further help to improve the space utilization and energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a partial structural schematic diagram of a battery pack of the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the connection between the middle cooling bottom plate, cooling baffle and cooling end beam;

[0023] Figure 3 for Figure 1 Top view of the middle cooling bottom plate, cooling baffles and cooling end beams;

[0024] Figure 4 for Figure 3 Sectional view at AA in the middle;

[0025] Figure 5 for Figure 4 A magnified schematic diagram of the part B in the middle;

[0026] Figure 6 for Figure 3 A schematic diagram of the structure of the main board body;

[0027] Figure 7 for Figure 3 Schematic diagram of the internal structure of the main board;

[0028] Figure 8A schematic diagram of the connection of the cooling baffle and the cooling bottom plate of the battery pack of the utility model in series;

[0029] Fig. 9 The figure is a schematic diagram of the parallel connection of the cooling baffle and the cooling base plate of the battery pack of the present invention.

[0030] Part Number Description

[0031] Cooling base plate 1, main board body 11, first cooling channel 111, second manifold 112, first liquid inlet and outlet 113, cooling unit 114, first manifold 12, manifold body 13, cooling baffle 2, cooling end beam 3, third manifold 31, fourth manifold 32, baffle 33, first liquid inlet and outlet interface 41, second liquid inlet and outlet interface 42, third liquid inlet and outlet interface 43, fourth liquid inlet and outlet interface 44, battery cell group 5, first liquid inlet and outlet pipe 61, second liquid inlet and outlet pipe 62, cooling pipe 63. DETAILED DESCRIPTION

[0032] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0034] See also Figure 1 , Figure 2 and Figure 7In some optional embodiments, the present application provides a battery pack, including multiple groups of battery cell groups 5, a cooling base plate 1, a cooling baffle 2, a cooling pipe 63 and a cooling end beam 3. A first cooling channel 111 for the flow of cooling medium is provided in the cooling base plate 1; a second cooling channel for the flow of cooling medium is provided in the cooling baffle 2, the battery cell groups 5 can be placed on the cooling base plate 1, and a cooling baffle 2 is provided between at least some adjacent battery cell groups 5; the cooling end beam 3 and the cooling baffle 2 are located on the same side of the cooling base plate 1, the cooling end beam 3 is placed on the cooling base plate 1, the cooling end beam 3 is fixedly connected to the cooling baffle 2 and the cooling base plate 1, and the first cooling channel 111 in the cooling base plate 1 and the second cooling channel in the cooling baffle 2 are connected in parallel or in series through the cooling end beam 3 and the cooling pipe 63.

[0035] Optionally, multiple groups of battery cell groups 5 are arranged side by side, and the battery cell groups 5 and the cooling bottom plate 1 can be bonded and fixed, and each group of battery cell groups 5 can include multiple battery cells stacked and arranged along the length direction of the cooling baffle 2. Cooling baffles 2 are arranged on both sides of the battery cell group 5 along the side-by-side direction, or in other words, the battery cell group 5 is sandwiched between two cooling baffles 2, and the cooling baffle 2 and the cooling bottom plate 1 cooperate to achieve three-sided cooling of the battery cell group 5, and the cooling effect is good.

[0036] Optionally, multiple cooling baffles 2 can be arranged in parallel, that is, the second cooling channels in different cooling baffles 2 are arranged in parallel. Among them, one or more second cooling channels can be arranged in the cooling baffle 2, and the second cooling channels in the same cooling baffle 2 are arranged in parallel, and the second cooling channels can be in a U-shaped structure.

[0037] Optionally, the cooling baffles 2 and the cooling end beams 3 may be arranged perpendicular to the cooling bottom plate 1 .

[0038] In the battery pack of the above-mentioned embodiment, the cooling base plate 1 and the cooling baffle 2 cooperate to cool the battery cell group 5, which is beneficial to improving the cooling effect, thereby improving the heat dissipation performance; and the first cooling channel 111 in the cooling base plate 1 and the second cooling channel in the cooling baffle 2 are connected through the cooling pipe 63 and the cooling end beam 3, and can be flexibly arranged as parallel connection or series connection according to needs, and the first cooling channel 111 and the second cooling channel are connected in series or in parallel, which is beneficial to reducing the number of medium conveying pipelines and nozzle joints, thereby reducing the number of components and simplifying the structure, and further facilitating improving the space utilization and energy density of the battery pack.

[0039] See also Figure 1 , Figure 2 and Figure 7In some optional embodiments, the cooling base plate 1 is further provided with a first collecting cavity 12 and a second collecting cavity 112 separated and connected to the first cooling channel 111, and the cooling end beam 3 is provided with a third collecting cavity 31 and a fourth collecting cavity 32 separated and connected to the second cooling channel.

[0040] Optionally, the first inlet and outlet liquid ends of the first cooling channel 111 are connected to the first collecting cavity 12, and the second inlet and outlet liquid ends of the first cooling channel 111 are connected to the second collecting cavity 112; the third inlet and outlet liquid ends of the second cooling channel are connected to the third collecting cavity 31, and the fourth inlet and outlet liquid ends of the second cooling channel are connected to the fourth collecting cavity 32.

[0041] Optionally, the cooling baffle 2 includes a stamped plate, an aluminum extruded harmonica tube or a profile plate, which is simple and convenient to form and manufacture, and is conducive to forming a second cooling flow channel in the cooling baffle 2.

[0042] Optionally, the cooling base plate 1 includes a stamping plate, an aluminum extruded harmonica tube or a profile plate. Further, the cooling base plate 1 includes a main plate body 11 and a current collecting plate body 13, the main plate body 11 includes a pressing plate, an aluminum extruded harmonica tube or a profile plate, and the current collecting plate body 13 includes a pressing plate, an aluminum extruded harmonica tube or a profile plate. The molding and manufacturing are simple and convenient, which is conducive to forming the first cooling flow channel 111, the first collecting cavity 12 and the second collecting cavity 112 in the cooling base plate 1.

[0043] Optionally, the cooling end beam 3 and the cooling baffle 2 can be connected and fixed by brazing, and the cooling end beam 3 and the cooling bottom plate 1 can be connected and fixed by brazing, and the connection is firm and reliable with good sealing performance.

[0044] Optionally, the third manifold 31 and the fourth manifold 32 extend in the parallel direction of the multiple groups of battery cells 5, respectively, the third inlet and outlet ends of the second cooling channels of the multiple cooling baffles 2 are connected to the same third manifold 31, and the fourth inlet and outlet ends of the second cooling channels of the multiple cooling baffles 2 are connected to the same fourth manifold 32. One of the third manifold 31 and the fourth manifold 32 serves as the inlet manifold of the cooling baffle 2, and the other serves as the outlet manifold of the cooling baffle 2. This structural design allows multiple cooling baffles 2 to share the same third manifold 31 and fourth manifold 32, without the need to configure a nozzle joint for each cooling baffle 2 separately, which is conducive to reducing the number of nozzle joints, thereby simplifying the structure, improving space utilization and reducing costs.

[0045] Optionally, a plurality of cooling units 114 are provided in the cooling base plate 1, each cooling unit 114 includes one or more first cooling channels 111, and the plurality of cooling units 114 are distributed along the parallel direction of the plurality of battery cell groups 5; the first manifold 12 and the second manifold 112 extend along the parallel direction of the plurality of battery cell groups 5 respectively, and the first inlet and outlet ends of the plurality of first cooling channels 111 of the plurality of cooling units 114 are connected to the same first manifold 12, and the second inlet and outlet ends of the plurality of first cooling channels 111 of the plurality of cooling units 114 are connected to the same second manifold 112. Further, the first cooling channel 111 can be a U-shaped structure. This structural design enables the plurality of first cooling channels 111 to share the same first manifold 12 and the second manifold 112, one of the first manifold 12 and the second manifold 112 serves as the liquid inlet manifold of the cooling base plate 1, and the other serves as the liquid outlet manifold of the cooling base plate 1, with a compact layout, which is conducive to improving space utilization and reducing costs.

[0046] Optionally, the cooling bottom plate 1 is provided with a third inlet and outlet liquid interface 43 and a fourth inlet and outlet liquid interface 44, the third inlet and outlet liquid interface 43 is connected to the first manifold 12, and the fourth inlet and outlet liquid interface 44 is connected to the second manifold 112, and the cooling medium enters from one of the third inlet and outlet liquid interface 43 and the fourth inlet and outlet liquid interface 44, and then flows out from the other. The third inlet and outlet liquid interface 43 and the fourth inlet and outlet liquid interface 44 can be distributed along the length direction of the cooling bottom plate 1.

[0047] Optionally, a first inlet and outlet liquid interface 41 and a second inlet and outlet liquid interface 42 are provided on the cooling baffle 2, the first inlet and outlet liquid interface 41 is connected to the third manifold 31, and the second inlet and outlet liquid interface 42 is connected to the fourth manifold 32, and the cooling medium enters from one of the first inlet and outlet liquid interface 41 and the second inlet and outlet liquid interface 42, and then flows out from the other. The first inlet and outlet liquid interface 41 and the second inlet and outlet liquid interface 42 can be distributed along the height direction of the cooling baffle 2.

[0048] In the present application, the side-by-side direction of the multiple groups of battery cell groups 5, the extension direction of the first collecting cavity 12, the extension direction of the second collecting cavity 112, the extension direction of the third collecting cavity 31, the extension direction of the fourth collecting cavity 32 and the length direction of the cooling end beam 3 are the same, that is, the Y direction in the accompanying drawings; the stacking direction of the multiple battery cells in each group of battery cell groups 5, the length direction of the cooling base plate 1 and the length direction of the cooling partition 2 are the same, that is, the X direction in the accompanying drawings; the height direction of the cooling partition 2 is the same as the height direction of the cooling end beam 3, that is, the Z direction in the accompanying drawings.

[0049] In the battery pack of the above embodiment, the first collecting chamber 12 and the second collecting chamber 112 are integrated in the cooling base plate 1, and the third collecting chamber 31 and the fourth collecting chamber 32 are integrated in the cooling partition 2, which is beneficial to reducing the number of components, especially the number of nozzle joints and medium delivery pipes, simplifying the structure, and improving the space utilization and energy density of the battery pack.

[0050] See also Figures 2 to 7 In some optional embodiments, the cooling end beam 3 and the cooling baffle 2 are located on the first side of the cooling base plate 1. The cooling base plate 1 includes a main board body 11 provided with a first cooling channel 111. A current collecting plate body 13 is provided on the side wall of the first side of the main board body 11. The current collecting plate body 13 cooperates with a part of the side wall of the first side of the main board body 11 to define a first collecting cavity 12.

[0051] Optionally, a first liquid inlet and outlet 113 is provided on the first side of the main body 11 , and the first liquid inlet and outlet ends of the first cooling channel 111 are in communication with the first manifold 12 through the first liquid inlet and outlet 113 .

[0052] Optionally, a first cavity formed as a second manifold 112 is provided in the main board body 11 .

[0053] Optionally, the first manifold 12 and the second manifold 112 are distributed along the length direction of the cooling base plate 1 .

[0054] In the battery pack of the above embodiment, the cooling base plate 1 has a simple structure and is easy to mold and manufacture. The first cooling channel 111, the first collecting chamber 12 and the second collecting chamber 112 are compactly arranged in the cooling base plate 1, which is beneficial to improving the space utilization of the cooling base plate 1, thereby improving the space utilization of the battery pack.

[0055] See also Figure 2 In some optional embodiments, the cooling end beam 3 has a second cavity, and a partition 33 is installed in the second cavity. The partition can separate the second cavity to form independent third collecting cavity 31 and fourth collecting cavity 32 distributed along the height direction of the cooling end beam 3. That is to say, the third collecting cavity 31 and the fourth collecting cavity 32 can be distributed up and down along the height direction of the cooling partition 2.

[0056] Optionally, the second cavity has a square longitudinal section, and the partition 33 divides the second cavity into a third manifold 31 with a square longitudinal section and a fourth manifold 32 with a square longitudinal section.

[0057] In the battery pack of the above embodiment, the cooling end beam 3 has a simple structure and is easy to form and manufacture. The third collecting cavity 31 and the fourth collecting cavity 32 are compactly arranged in the cooling end beam 3, which is beneficial to improving the space utilization of the cooling end beam 3, thereby improving the space utilization of the battery pack.

[0058] See also Figure 2 , Figure 5 , Figure 7 and Figure 8 In some optional embodiments, one of the first collecting chamber 12 and the third collecting chamber 31 can be externally connected to the first inlet and outlet liquid pipe 61, and the other can be externally connected to the second inlet and outlet liquid pipe 62. The second collecting chamber 112 and the fourth collecting chamber 32 are connected through a cooling pipe 63 to connect the first cooling channel 111 and the second cooling channel in series.

[0059] Optionally, the first inlet and outlet liquid interface 41 is externally connected to a first inlet and outlet liquid pipe 61, and the third inlet and outlet liquid interface 43 is externally connected to a second inlet and outlet liquid pipe 62; specifically, the cooling medium enters from the first inlet and outlet liquid pipe 61 and flows sequentially through the third manifold 31, the second cooling channel in the plurality of cooling baffles 2, the fourth manifold 32, the cooling pipe 63, the second manifold 112, the first cooling channel 111 and the first manifold 12, and is then discharged from the second inlet and outlet liquid pipe 62. It is understandable that the conveying direction of the cooling medium is not limited to the above-mentioned directions, and the cooling medium can also be conveyed in the opposite direction, that is, the inlet and outlet directions are interchanged, and the cooling medium enters from the second inlet and outlet liquid pipe 62 and is discharged from the first inlet and outlet liquid pipe 61, which will not be described in detail here.

[0060] In the battery pack of the above embodiment, the first cooling channel 111 in the cooling base plate 1 is connected in series with the second cooling channel in the cooling baffle 2, so that the cooling medium can flow fully between the cooling baffle 2 and the cooling base plate 1. The structure is simple, which is beneficial to reducing the number of parts, especially the number of cooling tubes 63 and nozzle joints, thereby improving space utilization, thereby improving the energy density of the battery pack and reducing costs.

[0061] See also Figure 2 , Figure 5 , Figure 7 and Fig. 9 In some optional embodiments, the first collecting chamber 12 and the third collecting chamber 31 are respectively connected to the first inlet and outlet liquid pipe 61 through the cooling pipe 63, and the second collecting chamber 112 and the fourth collecting chamber 32 are respectively connected to the second inlet and outlet liquid pipe 62 through the cooling pipe 63. This structural design enables the first cooling channel 111 in the cooling base plate 1 and the second cooling channel in the cooling partition 2 to be connected in parallel.

[0062] Optionally, the first inlet and outlet liquid interface 41 and the third inlet and outlet liquid interface 43 are connected to the first inlet and outlet liquid pipe 61 through the cooling pipe 63, and the second inlet and outlet liquid interface 42 and the fourth inlet and outlet liquid interface 44 are connected to the second inlet and outlet liquid pipe 62 through the cooling pipe 63, respectively. The cooling medium enters from the first inlet and outlet liquid pipe 61, and a part of the cooling medium flows through the first manifold 12, the first cooling channel 111 and the second manifold 112 in sequence and is discharged from the second inlet and outlet liquid pipe 62. Another part of the cooling medium flows through the third manifold 31, the second cooling channel and the fourth manifold 32 in sequence and is discharged from the second inlet and outlet liquid pipe 62. It can be understood that the conveying direction of the cooling medium is not limited to the above-mentioned directions, and the cooling medium can also be conveyed in the opposite direction, that is, the inlet and outlet directions are interchanged, and the cooling medium enters from the second inlet and outlet liquid pipe 62 and is discharged from the first inlet and outlet liquid pipe 61, which will not be repeated here.

[0063] In the battery pack of the above embodiment, the first cooling channel 111 in the cooling base plate 1 and the second cooling channel in the cooling partition 2 are connected in parallel. The first cooling channel 111 and the second cooling channel do not interfere with each other. They can share the first inlet and outlet liquid pipe 61 and the second inlet and outlet liquid pipe 62 to simplify the structure and improve space utilization. They can also be cooled independently of each other, reduce the failure rate, ensure the cooling effect, and improve the safety performance of the battery pack.

[0064] In the battery pack of the utility model, the first cooling channel 111 in the cooling base plate 1 and the second cooling channel in the cooling partition 2 are connected in series or in parallel through the cooling end plate 3 and the cooling pipeline 63, which is conducive to simplifying the structure and improving the space utilization rate; and the cooling base plate 1 is provided with a first collecting cavity 12 and a second collecting cavity 112 that can be shared by multiple first cooling channels 111, and the cooling end beam 3 is provided with a third collecting cavity 31 and a fourth collecting cavity 32 that can be shared by multiple second cooling channels, which is conducive to further simplifying the structure, so as to improve the energy density of the battery pack and reduce the cost of the battery pack.

[0065] In the description of this specification, the description with reference to the terms "this embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: Multiple battery packs; A cooling bottom plate, wherein a first cooling channel is provided in the cooling bottom plate; A cooling baffle, wherein a second cooling channel is provided in the cooling baffle, the battery cell groups are placed on the cooling bottom plate, and the cooling baffle is provided between at least some adjacent battery cell groups; Cooling pipe; as well as A cooling end beam is placed on the cooling base plate and fixedly connected to the cooling baffle and the cooling base plate. The first cooling channel in the cooling base plate and the second cooling channel in the cooling baffle are connected in parallel or in series through the cooling end beam and the cooling pipe.

2. The battery pack according to claim 1, characterized in that: The cooling base plate is also provided with a first collecting chamber and a second collecting chamber separated and connected to the first cooling channel, and the cooling end beam is provided with a third collecting chamber and a fourth collecting chamber separated and connected to the second cooling channel. One of the first collecting chamber and the third collecting chamber can be externally connected to a first inlet and outlet liquid pipe, and the other can be externally connected to a second inlet and outlet liquid pipe. The second collecting chamber and the fourth collecting chamber are connected through the cooling pipe to connect the first cooling channel and the second cooling channel in series.

3. The battery pack according to claim 1, characterized in that: The cooling base plate is also provided with a first collecting chamber and a second collecting chamber separated and connected to the first cooling channel, the cooling end beam is provided with a third collecting chamber and a fourth collecting chamber separated and connected to the second cooling channel, the first collecting chamber and the third collecting chamber are respectively connected to the first inlet and outlet liquid pipes through the cooling pipes, and the second collecting chamber and the fourth collecting chamber are respectively connected to the second inlet and outlet liquid pipes through the cooling pipes.

4. The battery pack according to claim 2 or 3, characterized in that: The first inlet and outlet liquid ends of the first cooling channel are connected to the first collecting cavity, and the second inlet and outlet liquid ends of the first cooling channel are connected to the second collecting cavity; the third inlet and outlet liquid ends of the second cooling channel are connected to the third collecting cavity, and the fourth inlet and outlet liquid ends of the second cooling channel are connected to the fourth collecting cavity.

5. The battery pack according to claim 2 or 3, characterized in that: The cooling end beam and the cooling baffle are located on the first side of the cooling base plate. The cooling base plate includes a main board body provided with a first cooling channel. A current collecting plate body is provided on the side wall of the first side of the main board body. The current collecting plate body cooperates with part of the side wall of the first side of the main board body to define the first collecting cavity.

6. The battery pack according to claim 5, characterized in that: A first liquid inlet and outlet is provided on the first side of the main board body, and a first liquid inlet and outlet end of the first cooling channel is communicated with the first manifold through the first liquid inlet and outlet.

7. The battery pack according to claim 5, characterized in that: A first cavity formed as the second manifold is disposed in the main board body.

8. The battery pack according to claim 2 or 3, characterized in that: The cooling end beam has a second cavity in it, and a partition is installed in the second cavity. The partition can separate the second cavity to form the third manifold and the fourth manifold that are independent and distributed along the height direction of the cooling end beam.

9. The battery pack according to claim 2 or 3, characterized in that: A plurality of battery cell groups are arranged side by side, and the cooling baffles are arranged on both sides of the battery cell groups along the side-by-side direction.

10. The battery pack according to claim 9, characterized in that: The third manifold and the fourth manifold respectively extend in the side-by-side direction of the multiple groups of battery cell groups, the third inlet and outlet liquid ends of the second cooling channels of the multiple cooling baffles are connected to the same third manifold, and the fourth inlet and outlet liquid ends of the second cooling channels of the multiple cooling baffles are connected to the same fourth manifold.

11. The battery pack according to claim 2 or 3, characterized in that: A plurality of cooling units are arranged in the cooling base plate, each of the cooling units includes one or more of the first cooling channels, and the plurality of cooling units are distributed along the side-by-side direction of the plurality of battery cell groups; the first collecting chamber and the second collecting chamber extend along the side-by-side direction of the plurality of battery cell groups respectively, the first inlet and outlet liquid ends of the plurality of the first cooling channels of the plurality of the cooling units are connected to the same first collecting chamber, and the second inlet and outlet liquid ends of the plurality of the first cooling channels of the plurality of the cooling units are connected to the same second collecting chamber.

12. The battery pack according to claim 1, characterized in that: The cooling baffle comprises a stamping plate, an aluminum extruded harmonica tube or a profile plate; the cooling bottom plate comprises a stamping plate, an aluminum extruded harmonica tube or a profile plate.

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