Battery pack and battery system thereof

Abstract

The invention provides a battery pack and a battery system thereof. The battery pack comprises a shell, a pipeline assembly, a plurality of first battery modules, a plurality of second battery modules and a plurality of third battery modules, the shell is provided with a first frame, a second frame and a third frame which are respectively used for accommodating the first battery module, the second battery module and the third battery module. The pipeline assembly comprises an input pipeline, a first pipeline group, a second pipeline group, a third pipeline group, an output pipeline group and a communication pipeline group. An input conduit is connected to the fluid inlet of the housing. The first pipeline group is arranged at the first side edge part of the shell and is connected with the input pipeline and the first battery module in series; the second and third pipeline groups are arranged at the second side part of the shell and are respectively connected with the second and third battery modules in series; the output pipeline group is connected to the fluid outlet of the shell and the second and third battery modules. The communication pipeline group is arranged at the rear shell part of the shell, is connected to the first battery module and is connected in parallel with the second battery module and the third battery module.

Description

Technical Field

[0001] The present invention relates to a battery pack and its battery system, and particularly to a battery pack and its battery system that use a pipe assembly to sequentially connect battery modules along a first side portion, a rear case portion, and a second side portion of a housing. Background Art

[0002] To date, electric vehicles are developing rapidly. In order to improve the ability of fast charging and slow discharging, it is actually important to monitor and manage the heat energy generated during the charging and discharging process of the battery pack.

[0003] Currently, there are two common battery pack cooling technologies: modular battery pack cooling design and non-modular battery pack cooling design. In the non-modular battery pack cooling design, multiple battery cells are encapsulated in a large fluid tank, making the entire battery pack bulky. Therefore, the non-modular battery pack cooling design is difficult to apply to various vehicle platforms of different sizes. Additionally, in the modular battery pack cooling design, the above problems encountered in the non-modular battery pack cooling design are solved by modularizing the fluid tank (for example, independently encapsulating each battery cell in a fluid container to form a battery module). However, the modular battery pack cooling design requires more connectors (such as wires, busbars, fluid pipes, etc.) to be configured between the battery modules to connect the battery modules, resulting in a messy and exposed wire / busbar / pipe arrangement. In addition, since the heat dissipation fluid pipes of the battery modules are usually connected to each other in series in the prior art, when the flow resistance of the fluid in the pipes is too large or the flow rates are inconsistent, uneven heat dissipation often occurs. On the other hand, if the prior art adopts a design of parallel connection of fluid pipes, it will lead to a complex, time-consuming, and laborious parallel pipe arrangement. Summary of the Invention

[0004] Therefore, an object of the present invention is to provide a battery pack and its battery system that use a pipe assembly to sequentially connect battery modules along a first side portion, a rear case portion, and a second side portion of a housing to solve the above problems.

[0005] According to an embodiment, the battery pack of the present invention includes a housing, a plurality of first battery modules, a plurality of second battery modules, a plurality of third battery modules, and a pipeline assembly. The housing has a first frame, a second frame, and at least one third frame arranged in sequence from top to bottom. The housing further has a front cover that detachably covers a front shell portion of the housing, and a fluid inlet and a fluid outlet are provided on the front cover. The plurality of first battery modules are disposed within the first frame. The plurality of second battery modules are disposed within the second frame. The plurality of third battery modules are disposed within the at least one third frame. The pipeline assembly includes an input pipeline, a first pipeline group, a second pipeline group, a third pipeline group, an output pipeline group, and a communication pipeline group. The input pipeline is connected to the fluid inlet. The first pipeline group is disposed on a first side portion of the housing, and the first pipeline group is connected to the input pipeline and is connected in series with the plurality of first battery modules within the first frame. The second pipeline group is disposed on a second side portion of the housing and is connected in series with the plurality of second battery modules within the second frame. The third pipeline group is disposed on the second side portion of the housing and is connected in series with the plurality of third battery modules within the third frame. The output pipeline group is connected to the second battery module, the third battery module, and the fluid outlet. The communication pipeline group is disposed on a rear shell portion of the housing, and the communication pipeline group is connected to the first battery module and is connected in parallel with the second battery module and the third battery module.

[0006] According to another embodiment, the battery system of the present invention includes a battery pack, a pump, and a thermal management module. The battery pack includes a housing, a plurality of first battery modules, a plurality of second battery modules, a plurality of third battery modules, and a pipeline assembly. The housing has a first frame, a second frame, and at least one third frame arranged in sequence from top to bottom. The housing further has a front cover that detachably covers a front shell portion of the housing, and a fluid inlet and a fluid outlet are provided on the front cover. The plurality of first battery modules are disposed within the first frame. The plurality of second battery modules are disposed within the second frame. The plurality of third battery modules are disposed within the at least one third frame. The pipeline assembly includes an input pipeline, a first pipeline group, a second pipeline group, a third pipeline group, an output pipeline group, and a communication pipeline group. The input pipeline is connected to the fluid inlet. The first pipeline group is disposed on a first side portion of the housing, and the first pipeline group is connected to the input pipeline and is connected to the plurality of first battery modules within the first frame in series. The second pipeline group is disposed on a second side portion of the housing and is connected to the plurality of second battery modules within the second frame in series. The third pipeline group is disposed on the second side portion of the housing and is connected to the plurality of third battery modules within the third frame in series. The output pipeline group is connected to the second battery module, the third battery module, and the fluid outlet. The communication pipeline group is disposed on a rear shell portion of the housing, and the communication pipeline group is connected to the first battery module and is connected to the second battery module and the third battery module in parallel. The pump is connected to the fluid inlet and the fluid outlet. The thermal management module is connected to the pump and is used to control the pump to pump a fluid into the battery pack to perform thermal management of the battery pack in an immersion cooling manner.

[0007] Through the above pipeline design in which the pipeline assembly is sequentially connected to the first battery module, the second battery module, and the third battery module along the first side portion, the rear shell portion, and the second side portion of the housing in a manner that the pipelines are not overlapped and configured on the same side portion of the housing, the present invention can effectively solve the problem that the modular battery pack cooling design in the prior art will cause the pipeline configuration to be too messy and exposed, thereby greatly saving the pipeline wiring space of the battery pack.

[0008] In addition, the present invention adopts a pipeline design in which the first pipeline group is connected in series to the first battery module and the second pipeline group and the third pipeline group are connected in parallel to the first pipeline group to solve the problems that the pipeline series design in the prior art will cause too large fluid flow resistance or inconsistent flow velocity and the pipeline parallel design will cause the pipeline configuration to be too complex and time-consuming. Through the above design, the present invention can not only improve the heat dissipation efficiency of the battery pack and maintain the temperature uniformity among the battery cores located within the battery pack, but also simplify the pipeline configuration of the battery pack.

[0009] The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings. Brief Description of the Drawings

[0010] Figure 1 is a schematic diagram of a battery system according to an embodiment of the present invention.

[0011] Figure 2 is Figure 1 a perspective schematic diagram of the battery pack from another perspective.

[0012] Figure 3 is Figure 2 a perspective schematic diagram of the battery pack from another perspective.

[0013] Figure 4 is Figure 3 a perspective schematic diagram of the battery pack from another perspective.

[0014] Figure 5 is Figure 4 a perspective schematic diagram of the battery pack from another perspective.

[0015] Among them, the reference numerals are described as follows:

[0016] 10: Battery system

[0017] 12: Battery pack

[0018] 14: Pump

[0019] 16: Thermal management module

[0020] 18: Housing

[0021] 19: Outer bump

[0022] 20: First battery module

[0023] 22: Second battery module

[0024] 24: Third battery module

[0025] 26: Pipeline assembly

[0026] 28: First frame

[0027] 30: Second frame

[0028] 32: Third frame

[0029] 34: Front cover

[0030] 36: Fluid inlet

[0031] 38: Fluid outlet

[0032] 40: Input pipeline

[0033] 42: First pipeline group

[0034] 43: First pipeline

[0035] 44: Second pipeline group

[0036] 45: Second pipeline

[0037] 46: Third pipeline group

[0038] 47: Third pipeline

[0039] 48: Connecting pipeline group

[0040] 50: Output pipeline group

[0041] 52: First connecting pipeline

[0042] 54: Second connecting pipeline

[0043] 56: Third connecting pipeline

[0044] 58, 66: Three-way valve

[0045] 60: First output pipeline

[0046] 62: Second output pipeline

[0047] 64: Third output pipeline

[0048] 68: Electric connection row assembly

[0049] 70: Positive electrode connector

[0050] 72: Negative electrode connector

[0051] 74: Positive electrode electric connection row

[0052] 76: First electric connection row group

[0053] 77: First electric connection row

[0054] 78: Second electric connection row group

[0055] 79: Second electric connection row

[0056] 80: Third electric connection row group

[0057] 81: Third electric connection row

[0058] 82: Negative electrode electric connection row

[0059] 84: Wire group

[0060] 86: First wire unit

[0061] 88: Second wire unit

[0062] 90: Third wire unit

[0063] F: Front housing part

[0064] S1: First side part

[0065] S2: Second side part

[0066] B: Rear housing part Detailed implementation manners

[0067] The following discloses the specific content of the embodiments of the present invention. The drawings and related descriptions in the present invention are only for exemplary applications. However, the present invention is not limited to these exemplary applications, and other derivative embodiments of the present invention can still be understood by those skilled in the art. Unless otherwise specified, similar or corresponding elements in the drawings can be marked by similar or corresponding symbols. In addition, the drawings and depictions in the present invention may not be presented in proportion and are not intended to correspond to actual sizes.

[0068] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic diagram of a battery system 10 proposed according to an embodiment of the present invention, Figure 2 is Figure 1 a three-dimensional schematic diagram of a battery pack 12 of Figure 1 from another perspective. As Figure 2 and Figure 1 shown, the battery system 10 can preferably be applied to an electric vehicle (not shown) to provide the power required to drive the electric vehicle. The battery system 10 includes a battery pack 12, a pump 14 (presented in a schematic diagram in Figure 2 ), and a thermal management module 16 (simply schematically shown as a functional block diagram). In order to clearly show the internal components of the battery pack 12, the entire outer cover of a housing 18 and the drawing of some frame members are omitted in

[0069] The battery pack 12 includes a housing 18, a plurality of first battery modules 20, a plurality of second battery modules 22, a plurality of third battery modules 24, and a pipe assembly 26. The housing 18 has a first frame 28, a second frame 30, and at least one third frame 32 arranged in sequence from top to bottom (only one is shown in Figure 2 , but not limited thereto, meaning that the number of frame layers depends on the actual assembly application of the battery pack 12). In addition, as Figure 1 and Figure 2As shown, at least one of the first frame 28, the second frame 30, and the third frame 32 of the housing 18 may have at least one external bump 19. For example, in this embodiment, the second frame 30 and the third frame 32 may each have four external bumps 19 (but not limited thereto, meaning the configured number of external bumps 19 may vary according to the modular requirements of the battery system 10). The battery pack 12 may be connected to at least one other battery pack 12 through the external bumps 19 (for example, connected by screwing) to construct a larger battery pack, thereby improving the assembly convenience of the battery system 10.

[0070] In addition, the housing 18 may have a front cover 34, and the front cover 34 detachably covers a front shell portion F of the housing 18. A fluid inlet 36 and a fluid outlet 38 may be provided on the front cover 34. The pump 14 is connected to the fluid inlet 36 and the fluid outlet 38, and the thermal management module 16 may include electronic components (such as a control circuit board, a flow meter, and a temperature sensor, etc., but not limited thereto) for performing battery heat dissipation management, so as to monitor the heat dissipation-related information of the battery cells and the heat dissipation fluid located in the battery module. In this way, the thermal management module 16 may be connected to the pump 14, and by controlling the pump 14 to pump the fluid into the heat dissipation design of the battery pack 12, the thermal management of the battery pack 12 is performed in an immersion cooling manner, and the heat dissipation fluid used may preferably be an inert dielectric fluid (but not limited thereto, meaning other types of heat dissipation fluids may also be used in the present invention, such as mineral oil, silicone oil, ester-based oil, or engineering fluid, etc.) to provide fire extinguishing ability at the same time. As for the thermal management design adopted by the thermal management module 16 and the fluid cooling process of the battery system 10, the related descriptions are common in the prior art. For the sake of simplicity, they will not be elaborated here.

[0071] The pipeline connection design of the pipeline assembly 26 will be described in detail as follows. Please refer to Figures 1 to 5 , Figure 3 For Figure 2 the battery pack 12 is a perspective schematic view from another angle, Figure 4 For Figure 3 the battery pack 12 is a perspective schematic view from another angle, Figure 5 For Figure 4 the battery pack 12 is a perspective schematic view from another angle, where in order to clearly show the internal components of the battery pack 12, Figures 3 to 5The depiction of certain frame assemblies of the housing 18 is omitted herein. In this embodiment, preferably two first battery modules 20 may be disposed within the first frame 28 (e.g., arranged side by side, but not limited thereto), preferably three second battery modules 22 may be disposed within the second frame 30 (e.g., arranged side by side, but not limited thereto), and preferably three third battery modules 24 may be disposed within the third frame 32 (e.g., arranged side by side, but not limited thereto). However, the present invention is not limited to the above quantities, meaning that the actual installation quantities of the first battery modules 20, the second battery modules 22, and the third battery modules 24 depend on the power requirements of the battery pack 12, and the number of pipes of the pipe assembly 26 can be adjusted correspondingly.

[0072] As Figures 1 to 5 shown, the pipe assembly 26 includes an input pipe 40, a first pipe group 42, a second pipe group 44, a third pipe group 46, a communication pipe group 48, and an output pipe group 50. The input pipe 40 is connected to the fluid inlet 36. The first pipe group 42 is disposed on a first side portion S1 of the housing 18 and is connected in series with a plurality of first battery modules 20 within the first frame 28 (as Figure 2 shown) for guiding the fluid to flow from the input pipe 40 into the plurality of first battery modules 20. The second pipe group 44 is disposed on a second side portion S2 of the housing 18 and is connected in series with a plurality of second battery modules 22 within the second frame 30 (as Figure 4 shown) for guiding the fluid to flow into the plurality of second battery modules 22, wherein the second side portion S2 and the first side portion S1 are opposite to each other. The third pipe group 46 is disposed on the second side portion S2 of the housing 18 and is connected in series with a plurality of third battery modules 24 within the third frame 32 (as Figure 4 shown) for guiding the fluid to flow into the plurality of third battery modules 24.

[0073] In this embodiment, the first pipe group 42 may include a first pipe 43 to be connected to two first battery modules 20 together with the input pipe 40 and the communication pipe group 48, such that the fluid flows through the two first battery modules 20 in sequence (as Figure 2 shown). The second pipe group 44 may include two second pipes 45 to be connected to three second battery modules 22 together with the communication pipe group 48 and the output pipe group 50, such that the fluid flows through the three second battery modules 22 in sequence (as Figure 4 shown). The third pipe group 46 may include two third pipes 47 to be connected to three third battery modules 24 together with the communication pipe group 48 and the output pipe group 50, such that the fluid flows through the three third battery modules 24 in sequence (as Figure 4 shown).

[0074] In addition, the communication pipe group 48 is disposed in a rear housing portion B of the housing 18 and connected to the first battery module 20, and is connected in parallel with the second battery module 22 and the third battery module 24. More specifically, in this embodiment, the communication pipe group 48 may include a first communication pipe 52, a second communication pipe 54, a third communication pipe 56, and a three-way valve 58. As Figure 3 and Figure 4 shown, the first communication pipe 52 is connected to the first battery module 20, the second communication pipe 54 is connected to the second battery module 22, the third communication pipe 56 is connected to the third battery module 24, and the three-way valve 58 is respectively connected to the first communication pipe 52, the second communication pipe 54, and the third communication pipe 56. Thereby, the communication pipe group 48 can guide the fluid from the first communication pipe 52 to the second communication pipe 54 and the third communication pipe 56 in parallel through the three-way valve 58, so that the fluid flows at a consistent flow rate in the second battery module 22 and the third battery module 24, achieving the effect of uniform heat dissipation.

[0075] In practical applications, the number of elbows of the second communication pipe 54 with a shorter pipe length (such as Figure 4 shown three elbows, but not limited thereto) can preferably be greater than the number of elbows of the third communication pipe 56 with a longer pipe length (such as Figure 4 shown two elbows, but not limited thereto), to achieve the flow resistance regulation effect, and further ensure that the fluid in the second communication pipe 54 and the third communication pipe 56 can enter the second battery module 22 and the third battery module 24 at the same flow rate. In addition, in this embodiment, as Figure 3 and Figure 4 shown, the third communication pipe 56 can pass through a transverse beam 31 of the second frame 30 to be connected to the third battery module 24, to achieve the effect of pipeline routing, thus solving the problems of overly messy pipeline configuration and exposure in the prior art, and can save the layout space required by the housing 18 for pipeline configuration. The above pipeline penetration design can also be applied to other connection pipelines in the battery pack 12, and the relevant description can be referred to Figure 3 and Figure 4 by analogy, which will not be elaborated here.

[0076] As for the relevant description of the output configuration of the output pipe group 50, it can be referred to Figure 4 and Figure 5 . As Figure 4 and Figure 5As shown, the output pipe group 50 can be connected to the second battery module 22, the third battery module 24, and the fluid outlet 38 for guiding the fluid to flow out from the fluid outlet 38. More specifically, in this embodiment, the output pipe group 50 includes a first output pipe 60, a second output pipe 62, a third output pipe 64, and a three-way valve 66. The first output pipe 60 is connected to the fluid outlet 38, the second output pipe 62 is connected to the second battery module 22, the third output pipe 64 is connected to the third battery module 24, and the three-way valve 66 is connected to the first output pipe 60, the second output pipe 62, and the third output pipe 64. Thereby, the output pipe group 50 can guide the fluid from the second output pipe 62 and the third output pipe 64 to the first output pipe 60 through the three-way valve 66 for fluid output.

[0077] It should be noted that, in order to further ensure that the fluid in the second battery module 22 and the third battery module 24 flows at a consistent flow rate, the total pipe length of the second pipe group 44 and the second output pipe 62 can preferably be equal to the total pipe length of the third pipe group 46 and the third output pipe 64, so that the fluid flows at a consistent flow rate in the second pipe group 44, the third pipe group 46, and the output pipe group 50, achieving a uniform heat dissipation effect. In addition, the above elbow design and pipe penetration design can also be applied to the output pipe group 50, and the relevant descriptions can be referred to Figure 3 and Figure 4 by analogy, which will not be elaborated here.

[0078] In summary, through the above pipe design of connecting the pipe components to the first battery module, the second battery module, and the third battery module in sequence along the first side portion, the rear housing portion, and the second side portion of the housing in a manner that the pipes are not overlapped on the same side portion of the housing, the present invention can effectively solve the problem in the prior art that the modular battery pack cooling design will cause the pipe configuration to be too messy and exposed, thereby greatly saving the pipe wiring space of the battery pack.

[0079] In addition, the present invention adopts a pipe design of connecting the first pipe group in series to the first battery module and connecting the second pipe group and the third pipe group in parallel to the first pipe group to solve the problems in the prior art that the pipe series design will cause too large fluid flow resistance or inconsistent flow rate and the pipe parallel design will cause the pipe configuration to be too complex and time-consuming. Through the above design, the present invention can not only improve the heat dissipation efficiency of the battery pack and maintain the temperature uniformity among the battery cores in the battery pack, but also simplify the pipe configuration of the battery pack.

[0080] It is worth mentioning that the above wiring design can also be applied to the electrical connection between the battery modules in the battery pack. For example, as Figures 1 to 5As shown, the battery pack 12 may further include an electrical connection row assembly 68, and the front cover 34 may be further provided with a positive electrode connector 70 and a negative electrode connector 72. In this embodiment, the electrical connection row assembly 68 may include a positive electrode electrical connection row 74, a first electrical connection row group 76, a second electrical connection row group 78, a third electrical connection row group 80, a negative electrode electrical connection row 82, and a wire group 84. The positive electrode electrical connection row 74 is electrically connected to the positive electrode connector 70, and the first electrical connection row group 76 is disposed on the first side portion S1 and is electrically connected in series with the positive electrode electrical connection row 74 and the first battery module 20. The second electrical connection row group 78 is disposed on the second side portion S2 and is electrically connected in series with the second battery module 22. The third electrical connection row group 80 is disposed on the second side portion S2 and is electrically connected in series with the third battery module 24. The negative electrode electrical connection row 82 is electrically connected to the negative electrode connector 72.

[0081] In this embodiment, the first electrical connection row group 76 may include two first electrical connection rows 77, the second electrical connection row group 78 may include five second electrical connection rows 79, and the third electrical connection row group 80 may include five third electrical connection rows 81, which are used to jointly establish electrical connection in series for two first battery modules 20, three second battery modules 22, and three third battery modules with the positive electrode electrical connection row 74, the wire group 84, and the negative electrode electrical connection row 82. As Figure 3 and Figure 5 shown, the first electrical connection row 77 at the upper position may be respectively connected to the negative electrode of the first battery module 20 at the front position of the first frame 28 and the positive electrode of the first battery module 20 at the rear position of the first frame 28, while the first electrical connection row 77 at the lower position may be respectively connected to the positive electrode of the first battery module 20 at the front position of the first frame 28 and the negative electrode of the first battery module 20 at the rear position of the first frame 28. As for the electrical connection in series between the second electrical connection row group 78 and the three second battery modules 22 and the electrical connection in series between the third electrical connection row group 80 and the three third battery modules 24, the relevant descriptions can be referred to Figure 3 and Figure 5 by analogy and will not be elaborated here.

[0082] In addition, the wire group 84 is disposed in the rear housing portion B of the housing 18. More specifically, as Figure 3 and Figure 4As shown, the wire group 84 may include a first wire unit 86, a second wire unit 88, and a third wire unit 90. The first wire unit 86 (preferably composed of a wire and two electrical connection rows, but not limited thereto) is electrically connected to the first battery module 20 located at the rear position of the first frame 28 and the second battery module 22 located at the rear position of the second frame 30. The second wire unit 88 (preferably composed of a wire and two electrical connection rows, but not limited thereto) is electrically connected to the second battery module 22 located at the rear position of the second frame 30 and the third battery module 24 located at the rear position of the third frame 32. The third wire unit 90 (preferably composed of a wire and two electrical connection rows, but not limited thereto) is electrically connected to the third battery module 24 located at the rear position of the third frame 32 and the first battery module 20 located at the rear position of the first frame 28.

[0083] Through the above design, the wire group 84 can respectively establish a series electrical connection between the first electrical connection row group 76 and the second electrical connection row group 78, a series electrical connection between the second electrical connection row group 78 and the third electrical connection row group 80, and a series electrical connection between the third electrical connection row group 80 and the first electrical connection row group 76. In addition, in this embodiment, as Figure 3 and Figure 4 shown, the second wire unit 88 can pass through the transverse beam 31 to be electrically connected to the third battery module 24, and the third wire unit 90 can pass through the transverse beam 31 to be electrically connected to the first battery module 20 to achieve the effect of wire routing management. The above wire penetration design can also be applied to other wires in the battery pack 12, and the relevant description can be referred to Figure 3 and Figure 4 for analogy and will not be elaborated herein.

[0084] In summary, through the above wire routing design of surrounding the housing with the electrical connection row assembly in a manner that the electrical connection rows and wires are not overlapped and arranged on the same side of the housing and serially electrically connecting to the first battery module, the second battery module, and the third battery module, the present invention can effectively solve the problems mentioned in the prior art that the wire / electrical connection row configuration in the modular battery pack cooling design is too messy and exposed, thereby greatly saving the wire / electrical connection row wiring space of the battery module.

[0085] The above are only the preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A housing having a first frame, a second frame and at least a third frame arranged in sequence from top to bottom, the housing further having a front cover, the front cover detachably covering a front shell portion of the housing, the front cover being provided with a fluid inlet and a fluid outlet; a plurality of first battery modules, which are disposed in the first frame; a plurality of second battery modules disposed in the second frame; a plurality of third battery modules disposed in the at least one third frame; as well as A pipeline assembly comprising: an input pipe connected to the fluid inlet; a first pipe group, which is disposed on a first side portion of the housing, the first pipe group being connected to the input pipe and connected in series with a plurality of the first battery modules in the first frame; a second pipe group, which is disposed on a second side portion of the housing and connected in series with a plurality of the second battery modules in the second frame; a third pipe group, which is arranged on the second side portion of the housing and connected in series with the plurality of third battery modules in the third frame; an output pipe group connected to the second battery module, the third battery module, and the fluid outlet; and A communication pipe group is disposed on a rear shell portion of the housing, wherein the communication pipe group is connected to the first battery module and is connected in parallel with the second battery module and the third battery module.

2. The battery pack according to claim 1, wherein: The communicating pipeline group comprises: a first communication pipe connected to the first battery module; a second communication pipe connected to the second battery module; a third communication pipe connected to the third battery module; and A three-way valve is connected to the first communication pipe, the second communication pipe, and the third communication pipe.

3. The battery pack according to claim 2, characterized in that: The number of bends in the second communicating pipe is greater than the number of bends in the third communicating pipe.

4. The battery pack according to claim 2, characterized in that: The third communication duct passes through a transverse beam of the second frame to be connected to the third battery module.

5. The battery pack according to claim 1, wherein: The output pipeline group includes: a first output pipe connected to the fluid outlet; a second output pipe connected to the second battery module; a third output pipe connected to the third battery module; and A three-way valve is connected to the first output pipeline, the second output pipeline, and the third output pipeline.

6. The battery pack according to claim 5, characterized in that: The total pipe length of the second pipe group and the second output pipe is equal to the total pipe length of the third pipe group and the third output pipe.

7. The battery pack according to claim 5, characterized in that: The number of bends in the second output pipeline is greater than the number of bends in the third output pipeline.

8. The battery pack according to claim 1, wherein: The battery pack further includes an electrical connection row assembly, the front cover further has a positive electrode connector and a negative electrode connector, and the electrical connection row assembly includes: a positive electrode electrical connection row, electrically connected to the positive electrode connector; a first electrical connection bar group, which is disposed on the first side portion and is electrically connected in series with the positive electrode electrical connection bar and a plurality of the first battery modules; a second electrical connection bank, disposed on the second side portion and electrically connected to a plurality of the second battery modules in series; a third electrical connection bank, disposed on the second side portion and electrically connected to a plurality of the third battery modules in series; a negative electrode electrical connection bar electrically connected to the negative electrode terminal; and A wire set is arranged on the rear shell portion to respectively establish electrical connection between the first electrical connection set and the second electrical connection set, between the second electrical connection set and the third electrical connection set, and between the third electrical connection set and the first electrical connection set.

9. The battery pack according to claim 8, characterized in that: The wire set comprises: a first wire unit electrically connected to the first battery module and the second battery module; a second wire unit electrically connected to the second battery module and the third battery module; and a third wire unit electrically connected to the third battery module and the first battery module; The second wire unit passes through the transverse beam to be electrically connected to the third battery module, and the third wire unit passes through the transverse beam to be electrically connected to the first electrical connection array.

10. The battery pack according to claim 1, wherein: At least one of the first frame, the second frame, and the at least one third frame has at least one external protrusion connected to at least one other battery group to form a battery pack.

11. A battery system, characterized in that: include: A battery pack comprising: A housing having a first frame, a second frame and at least a third frame arranged in sequence from top to bottom, the housing further having a front cover, the front cover detachably covering a front shell portion of the housing, the front cover being provided with a fluid inlet and a fluid outlet; a plurality of first battery modules, which are disposed in the first frame; a plurality of second battery modules disposed in the second frame; a plurality of third battery modules disposed in the at least one third frame; and A pipeline assembly comprising: an input pipe connected to the fluid inlet; a first pipe group, which is disposed on a first side portion of the housing, the first pipe group being connected to the input pipe and connected in series with a plurality of the first battery modules in the first frame; a second pipe group, which is disposed on a second side portion of the housing and connected in series with a plurality of the second battery modules in the second frame; a third pipe group, which is arranged on the second side portion of the housing and connected in series with the plurality of third battery modules in the third frame; an output pipe group connected to the second battery module, the third battery module, and the fluid outlet; and a communication pipe group, which is disposed on a rear shell portion of the housing, the communication pipe group is connected to the first battery module and is connected in parallel with the second battery module and the third battery module; a pump connected to the fluid inlet and the fluid outlet; and A thermal management module is connected to the pump and is used to control the pump to pump a fluid into the battery pack to perform thermal management of the battery pack in an immersion cooling manner.

12. The battery system according to claim 11, characterized in that: The communicating pipeline group comprises: a first communication pipe connected to the first battery module; a second communication pipe connected to the second battery module; a third communication pipe connected to the third battery module; and A three-way valve is connected to the first communication pipe, the second communication pipe, and the third communication pipe.

13. The battery system according to claim 12, characterized in that: The number of bends in the second communicating pipe is greater than the number of bends in the third communicating pipe.

14. The battery system according to claim 12, characterized in that: The third communication duct passes through a transverse beam of the second frame to be connected to the third battery module.

15. The battery system according to claim 11, characterized in that: The output pipeline group includes: a first output pipe connected to the fluid outlet; a second output pipe connected to the second battery module; a third output pipe connected to the third battery module; and A three-way valve is connected to the first output pipeline, the second output pipeline, and the third output pipeline.

16. The battery system according to claim 15, characterized in that: The total pipe length of the second pipe group and the second output pipe is equal to the total pipe length of the third pipe group and the third output pipe.

17. The battery system according to claim 15, characterized in that: The number of bends in the second output pipeline is greater than the number of bends in the third output pipeline.

18. The battery system according to claim 11, characterized in that: The battery pack further includes an electrical connection row assembly, the front cover further has a positive electrode connector and a negative electrode connector, and the electrical connection row assembly includes: a positive electrode electrical connection row, electrically connected to the positive electrode connector; a first electrical connection bar group, which is disposed on the first side portion and is electrically connected in series with the positive electrode electrical connection bar and a plurality of the first battery modules; a second electrical connection bank, disposed on the second side portion and electrically connected to a plurality of the second battery modules in series; a third electrical connection bank, disposed on the second side portion and electrically connected to a plurality of the third battery modules in series; a negative electrode electrical connection bar electrically connected to the negative electrode terminal; and A wire set is arranged on the rear shell portion to respectively establish electrical connection between the first electrical connection set and the second electrical connection set, between the second electrical connection set and the third electrical connection set, and between the third electrical connection set and the first electrical connection set.

19. The battery system according to claim 18, characterized in that: The wire set comprises: a first wire unit electrically connected to the first battery module and the second battery module; a second wire unit electrically connected to the second battery module and the third battery module; and a third wire unit electrically connected to the third battery module and the first battery module; The second wire unit passes through the transverse beam to be electrically connected to the third battery module, and the third wire unit passes through the transverse beam to be electrically connected to the first electrical connection array.

20. The battery system according to claim 11, characterized in that: At least one of the first frame, the second frame, and the at least one third frame has at least one external protrusion connected to at least one other battery group to form a battery pack.

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