Battery pack and battery system thereof

Abstract

To provide a battery pack utilizing a pipe assembly to be coupled to battery modules along a first side portion, a back portion, and a second side portion of a casing sequentially and a battery system thereof.SOLUTION: A battery system includes a battery pack 12 including a casing 18, a pipe assembly, and first to third battery modules 20 to 24 disposed within the casing. The pipe assembly includes an input pipe 40, an output pipe set 50 to be coupled to the second battery modules and the third battery modules, a communication pipe set 48 to be coupled to the first battery module and coupled in parallel to the second and third battery modules, a first pipe set 42 disposed at a first side portion of the casing to be coupled to the input pipe and coupled to the first battery modules, and second and third pipe sets disposed at a second side portion of the casing to be coupled to the second and third battery modules, respectively.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a battery pack and its battery system, and more specifically, to a battery pack using a pipe assembly connected to battery modules along the first side, rear, and second side of a casing in sequence, and its battery system.

Background Art

[0002] The development of electric vehicles is progressing rapidly. To enhance the high-speed charging and low-speed discharging capabilities, it is important to manage the heat generated during the charging and discharging processes of the battery pack.

[0003] Currently, there are two types of conventional cooling battery packs (modular cooling battery packs and non-modular cooling battery packs). The non-modular cooling battery pack may enclose multiple cell assemblies in one large fluid tank, and the whole pack may be bulky and heavy. Therefore, it is difficult to adopt the non-modular cooling battery pack for vehicle platforms of various sizes. The modular cooling battery pack can solve the aforementioned problems of the non-modular cooling battery pack by modularizing the fluid tank (for example, by enclosing each cell assembly in an independent fluid container to form one battery module). However, the modular cooling battery pack requires more connectors (such as cables, busbars, and fluid pipes) between the battery modules, which may cause a messy and exposed cable / busbar / pipe arrangement. Furthermore, in the prior art, since the fluid pipes for heat dissipation of the battery modules are usually connected in series, non-uniform heat dissipation occurs due to excessive flow resistance or non-uniform flow rate of the fluid in the fluid pipes. On the other hand, if the prior art adopts a design of connecting the fluid pipes in parallel, it may result in a complex, time-consuming, and laborious parallel pipeline arrangement.

Summary of the Invention

[0004] The present disclosure provides a battery pack including a casing, a plurality of first battery modules, a plurality of second battery modules, a plurality of third battery modules, and a pipe assembly. The casing has a first frame, a second frame, and at least one third frame arranged in order from top to bottom. The casing further has a front cover that detachably covers the front portion of the casing, and the front cover has a fluid inlet and a fluid outlet. The plurality of first battery modules are arranged in the first frame. The plurality of second battery modules are arranged in the second frame. The plurality of third battery modules are arranged in at least one third frame. The pipe assembly includes an input pipe, a first pipe set, a second pipe set, a third pipe set, an output pipe, and a communication pipe set. The input pipe is connected to the fluid inlet. The first pipe set is arranged on a first side of the casing. The first pipe set is connected to the input pipe and is connected in series to the plurality of first battery modules in the first frame. The second pipe set is arranged on a second side of the casing and is connected in series to the plurality of second battery modules in the second frame. The second side is opposite to the first side. The third pipe set is arranged on the second side of the casing and is connected in series to the plurality of third battery modules in the third frame. The output pipe set is connected to the second battery module, the third battery module, and the fluid outlet. The communication pipe set is arranged at the rear of the casing, is connected to the first battery module, and is connected in parallel to the second battery module and the third battery module.

[0005] The present disclosure further provides a battery system including a battery pack, a pump, and a thermal management module. The battery pack includes a casing, a plurality of first battery modules, a plurality of second battery modules, a plurality of third battery modules, and a pipe assembly. The casing has a first frame, a second frame, and at least one third frame arranged in order from top to bottom. The casing further has a front cover that removably covers the front portion of the casing, and the front cover has a fluid inlet and a fluid outlet. The plurality of first battery modules are arranged within the first frame. The plurality of second battery modules are arranged within the second frame. The plurality of third battery modules are arranged within at least one third frame. The pipe assembly includes an input pipe, a first pipe set, a second pipe set, a third pipe set, an output pipe, and a communication pipe set. The input pipe is connected to the fluid inlet. The first pipe set is arranged on a first side portion of the casing. The first pipe set is connected to the input pipe and is connected in series to the plurality of first battery modules within the first frame. The second pipe set is arranged on a second side portion of the casing and is connected in series to the plurality of second battery modules within the second frame. The second side portion is opposite to the first side portion. The third pipe set is arranged on the second side portion of the casing and is connected in series to the plurality of third battery modules within the third frame. The output pipe set is connected to the second battery module, the third battery module, and the fluid outlet. The communication pipe set is arranged at the rear portion of the casing, is connected to the first battery module, and is connected in parallel to the second battery module and the third battery module. The pump is connected to the fluid inlet and the fluid outlet. The thermal management module is connected to the pump for thermal management of the battery pack in an immersion cooling method by controlling the pump to pump fluid to the battery pack.

[0006] These and other objects of the present invention will become apparent to those skilled in the art after reading the following detailed description of the preferred embodiments shown in the various drawings.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Best Mode for Carrying Out the Invention

[0008] The following disclosure includes specific information regarding exemplary embodiments of the present disclosure. The drawings and the detailed disclosure accompanying them in the present disclosure are for the purpose of exemplary embodiments only. However, the present disclosure is not limited to merely these exemplary embodiments. Those skilled in the art will envision other variations and embodiments of the present disclosure. Unless otherwise indicated, similar or corresponding elements in the drawings may be denoted by similar or corresponding reference numerals. Furthermore, the drawings and examples in the present disclosure are generally not to scale and are not intended to correspond to actual relative dimensions.

[0009] Please refer to FIGS. 1 and 2. FIG. 1 is a diagram of a battery system 10 according to an embodiment of the present disclosure. FIG. 2 is a diagram of the battery pack 12 of FIG. 1 from another viewing angle. As shown in FIGS. 1 and 2, the battery system 10 is preferably applied to an electric vehicle (not shown) to supply power for driving the electric vehicle, and includes a battery pack 12, a pump 14 (simply shown in FIG. 1), and a thermal management module 16 (represented by functional blocks for simplicity). In order to clearly show the internal components of the battery pack 12, in FIG. 2, all covers of the casing 18 and some frame components are omitted.

[0010] The battery pack 12 includes a casing 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 casing 18 has a first frame 28, a second frame 30, and at least one third frame 32 arranged in order from top to bottom (although only one is shown in FIG. 2, it is not limited thereto, meaning that the number of layers of frames depends on the actual assembly application of the battery pack 12). Further, as shown in FIGS. 1 to 2, at least one of the first frame 28, the second frame 30, and the third frame 32 of the casing 18 can have at least one outer protrusion 19. For example, in this embodiment, the second frame 30 and the third frame 32 can each have four outer protrusions 19 (however, it is not limited thereto, meaning that the number of outer protrusions 19 depends on the modularization requirements of the battery system 10). The outer protrusion 19 can be connected (e.g., by a screw-lock method) to at least one other battery pack 12 to form a larger battery pack assembly so as to enhance the convenience of assembling the battery system 10.

[0011] Furthermore, the casing 18 further has a front cover 34 that removably covers the front portion F of the casing 18, and the front cover 34 has a fluid inlet 36 and a fluid outlet 38 disposed thereon. The pump 14 is connected to the fluid inlet 36 and the fluid outlet 38, and the thermal management module 16 can include electronic components (such as, but not limited to, a management circuit board, a flow meter, and a temperature sensor) applied to the thermal management of the battery pack to collect heat dissipation information of the fluid in the battery cell and the battery module. Thus, the thermal management module 16 can be connected to the pump 14 for the thermal management of the battery pack 12 in an immersion cooling method by controlling the pump 14 to pump the fluid to the battery pack 12. The fluid is preferably an inert dielectric fluid and can provide a fire extinguishing ability (however, it is not limited thereto, and the present disclosure means that other thermal management fluids such as mineral oil, silicone oil, ester-based oil, or processing fluid can be adopted). Regarding the thermal management design of the thermal management module 16 and the fluid cooling process of the battery system 10, related descriptions are commonly found in the prior art and are omitted herein for brevity.

[0012] A more detailed description of the pipe connection design of the pipe assembly 26 is provided below. Refer to FIGS. 1-5. FIG. 3 is a view of the battery pack 12 of FIG. 2 from another viewing angle. FIG. 4 is a view of the battery pack 12 of FIG. 3 from another viewing angle. FIG. 5 is a view of the battery pack 12 of FIG. 4 from another viewing angle. To clearly show the internal components of the battery pack 12, some frame components of the casing 18 are omitted in FIGS. 3-5. In this embodiment, preferably, two first battery modules 20 (for example, arranged side by side, but not limited thereto) arranged in the first frame 28, three second battery modules 22 (for example, arranged side by side, but not limited thereto) arranged in the second frame 30, and three third battery modules 24 (for example, arranged side by side, but not limited thereto) arranged in the third frame 32 can exist, and the present disclosure is not limited thereto. The number of the first battery module 20, the second battery module 22, and the third battery module 24 actually attached depends on the power requirements of the battery pack 12, which means that the number of pipes of the pipe assembly 26 changes accordingly.

[0013] As shown in FIGS. 1 to 5, the pipe assembly 26 includes an input pipe 40, a first pipe set 42, a second pipe set 44, a third pipe set 46, a communication pipe set 48, and an output pipe set 50. The input pipe 40 is connected to the fluid inlet 36. The first pipe set 42 is disposed on the first side S1 of the casing 18 and is connected in series to a plurality of first battery modules 20 within the first frame 28 (as shown in FIG. 2) to direct fluid flowing from the input pipe 40 to the plurality of first battery modules 20. The second pipe set 44 is disposed on the second side S2 of the casing 18 and is connected in series to a plurality of second battery modules 22 within the second frame 30 (as shown in FIG. 4) to direct fluid flowing to the plurality of second battery modules 22, and the second side S2 is opposite to the first side S1. The third pipe set 46 is disposed on the second side S2 of the casing 18 and is connected in series to a plurality of third battery modules 24 within the third frame 32 (as shown in FIG. 4) to direct fluid flowing to the plurality of third battery modules 24.

[0014] In this embodiment, the first pipe set 42 can include one first pipe 43 for connecting to two first battery modules 20 together with the input pipe 40 and the communication pipe set 48 to allow fluid to flow continuously through two first battery modules (as shown in FIG. 2). The second pipe set 44 can include two second pipes 45 for connecting to three second battery modules 22 together with the communication pipe set 48 and the output pipe set 50 to allow fluid to flow continuously through three second battery modules (as shown in FIG. 4). The third pipe set 46 can include two third pipes 47 for connecting to three third battery modules 24 together with the communication pipe set 48 and the output pipe set 50 to allow fluid to flow continuously through three third battery modules 22 (as shown in FIG. 4).

[0015] Furthermore, the communication pipe set 48 is disposed at the rear portion B of the casing 18, connected to the first battery module 20, and connected in parallel to the second battery module 22 and the third battery module 24. More specifically, in this embodiment, the communication pipe set 48 includes a first communication pipe 52, a second communication pipe 54, a third communication pipe 56, and a three-way valve 58. As shown in FIGS. 3 to 4, 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 connected to the first communication pipe 52, the second communication pipe 54, and the third communication pipe 56, respectively. In this way, in order to make the fluid flow at a constant flow rate within the second battery module 22 and the third battery module 24 to achieve a uniform heat dissipation effect, the communication pipe set 48 can guide the fluid from the first communication pipe 52 to the second communication pipe 54 and the third communication pipe 56 connected in parallel via the three-way valve 58.

[0016] In actual applications, in order to achieve a flow resistance adjustment effect to ensure that the fluid in the second communication pipe 54 and the third communication pipe 56 can flow into the second battery module 22 and the third battery module 24 at the same flow rate, the number of curves (although 3 curves are shown in FIG. 4, it is not limited thereto) of the shorter second communication pipe 54 may preferably be more than the number of curves (although 2 curves are shown in FIG. 4, it is not limited thereto) of the longer third communication pipe 56. Furthermore, in this embodiment, as shown in FIGS. 3 to 4, in order to solve the problem of the prior art of messy and exposed pipes and save the space of the pipe path within the casing 18 to achieve a pipe management effect, the third communication pipe 56 penetrates through the cross beam 31 of the second frame 30 connected to the third battery module 24. The above-mentioned pipe passing design can also be applied to other pipes within the battery pack 12, and the related description can be inferred by analogy according to FIGS. 3 to 4, and is omitted herein.

[0017] Regarding the output configuration of the output pipe set 50, refer to FIGS. 4 to 5. As shown in FIGS. 4 to 5, the output pipe set 50 is connected to the second battery module 22, the third battery module 24, and the fluid outlet 38 in order to guide the fluid flowing out from the fluid outlet 38. More specifically, in this embodiment, the output pipe set 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. Therefore, the output pipe set 50 can guide the fluid from the second output pipe 62 and the third output pipe 64 to the first output pipe 60 via the three-way valve 66 for fluid output.

[0018] In order to further ensure that the fluid flows at a constant flow rate within the second battery module 22 and the third battery module 24, the sum of the pipe lengths of the second pipe set 44 and the second output pipe 62 can preferably be made equal to the sum of the pipe lengths of the third pipe set 46 and the third output pipe 64. Note that in this way, the fluid flows at a constant flow rate within the second pipe set 44, the third pipe set 46, and the output pipe set 50, and a uniform heat dissipation effect can be achieved. Furthermore, the above-mentioned curve design and pipe passing design can also be applied to the output pipe set 50, and the related explanations can be inferred by analogy with FIGS. 3 to 4 and are omitted in this specification for the sake of brevity.

[0019] In summary, with the above-described design in which the pipe assembly is connected to the first battery module, the second battery module, and the third battery module in sequence along the first side, the rear, and the second side within the casing without stacking the pipes on the same side of the casing, the present disclosure can efficiently solve the problem of the messy and exposed pipe arrangement of the modular cooling battery pack described above in the prior art so as to greatly save the space of the pipe path of the battery pack.

[0020] Furthermore, the present disclosure adopts a design in which the first pipe set is connected in series to the first battery module, and the second pipe set and the third pipe set are connected in parallel to the first pipe set, so as to solve the prior art problems of excessive flow resistance or non-constant fluid flow rate in the complicated, time-consuming, and bone-breaking pipeline arrangement caused by all of the fluid pipes in series connection or the fluid pipes connected in parallel. In this way, the present disclosure not only improves the heat dissipation efficiency of the battery pack and maintains the temperature uniformity among the battery cells in the battery pack, but also simplifies the pipe configuration within the battery pack.

[0021] It should be noted that the above route design can also be applied to the electrical connection between the battery modules of the battery pack. For example, as shown in FIGS. 1 to 5, the battery pack 12 further includes a bus bar connection assembly 68, and the front cover 34 further has a positive terminal 70 and a negative terminal 72. In this embodiment, the bus bar connection assembly 68 can include a positive bus bar 74, a first bus bar set 76, a second bus bar set 78, a third bus bar set 80, a negative bus bar 82, and a cable set 84. The positive bus bar 74 is electrically connected to the positive terminal 70. The first bus bar set 76 is disposed on the first side portion S1 and is electrically connected in series to the positive bus bar 74 and the first battery module 20. The second bus bar set 78 is disposed on the second side portion S2 and is electrically connected in series to the second battery module 22. The third bus bar set 80 is disposed on the second side portion S2 and is electrically connected in series to the third battery module 24. The negative bus bar 82 is electrically connected to the negative terminal 72.

[0022] In this embodiment, in order to establish a series connection of two first battery modules 20, three second battery modules 22, and three third battery modules that cooperate with the positive electrode bus bar 74, the cable set 84, and the negative electrode bus bar 82, the first bus bar set 76 can include two first bus bars 77, the second bus bar set 78 can include five bus bars 79, and the third bus bar set 80 can include five third bus bars 81. As shown in FIGS. 3 and 5, the first bus bar 77 at the upper position is connected to the negative electrode of the first battery module 20 located at the front position of the first frame 28 and the positive electrode of the first battery module 20 located at the rear position of the first frame 28, respectively, and the first bus bar 77 at the lower position is connected to the positive electrode of the first battery module 20 located at the front position of the first frame 28 and the negative electrode of the first battery module 20 located at the rear position of the first frame 28, respectively. Regarding the series connection of the second bus bar set 78 and the three second battery modules 22 and the series connection of the third bus bar set 80 and the three third battery modules 24, the related description can be inferred by analogy with FIGS. 3 and 5 and is omitted herein for the sake of brevity.

[0023] Furthermore, the cable set 84 is disposed at the rear portion B of the casing 18. More specifically, as shown in FIGS. 3 to 4, the cable set 84 includes a first cable unit 86, a second cable unit 88, and a third cable unit 90. The first cable unit 86 (preferably, but not limited to, being composed of a cable and two busbars) 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 cable unit 88 (preferably, but not limited to, being composed of a cable and two busbars) 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 cable unit 90 (preferably, but not limited to, being composed of a cable and two busbars) 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.

[0024] Accordingly, the cable set 84 can establish each of a series connection between the first busbar set 76 and the second busbar set 78, a series connection between the second busbar set 78 and the third busbar set 80, and a series connection between the third busbar set 80 and the first busbar set 76. Further, in this embodiment, as shown in FIGS. 3 to 4, in order to achieve a cable management effect, the second cable unit 88 penetrates the cross beam 31 so as to be electrically connected to the third battery module 24, and the third cable unit 90 penetrates the cross beam 31 so as to be electrically connected to the first battery module 20. The above-described cable passing design can also be applied to other cables in the battery pack 12, and related descriptions can be inferred by analogy with FIGS. 3 to 4 and are omitted herein for simplicity.

[0025] In summary, with the above-described design in which the bus bar connection assembly is connected in series to the first battery module, the second battery module, and the third battery module around the casing without overlapping the bus bar and the cable on the same side of the casing, the present disclosure can efficiently solve the problem of the messy and exposed cable / bus bar arrangement of the modular cooling battery pack described above in the prior art so as to significantly save the space of the cable / bus bar path of the battery pack.

[0026] Those skilled in the art will readily understand that many modifications and changes can be made to the apparatus and methods while maintaining the teachings of the present invention. Accordingly, the above disclosure should be construed as being limited only by the boundaries and scope of the appended claims.

Claims

1. A casing having a first frame, a second frame, and at least one third frame arranged in order from top to bottom, the casing further having a front cover that removably covers the front portion of the casing, the front cover having a fluid inlet and a fluid outlet, the casing, A plurality of first battery modules arranged in the first frame, A plurality of second battery modules arranged in the second frame, A plurality of third battery modules arranged in the at least one third frame, A pipe assembly, An input pipe connected to the fluid inlet, A first pipe set arranged on a first side portion of the casing, connected to the input pipe, and connected in series to the plurality of first battery modules in the first frame, the first pipe set, A second pipe set arranged on a second side portion of the casing opposite to the first side portion, and connected in series to the plurality of second battery modules in the second frame, A third pipe set arranged on the second side portion of the casing, and connected in series to the plurality of third battery modules in the third frame, The second battery module, the third battery module, and an output pipe set connected to the fluid outlet, A communication pipe set arranged at the rear portion of the casing, connected to the first battery module, and connected in parallel to the second battery module and the third battery module A pipe assembly comprising A battery pack comprising

2. The communication pipe set is 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, A three-way valve connected to the first communication pipe, the second communication pipe, and the third communication pipe The battery pack according to claim 1, comprising

3. The battery pack according to claim 2, wherein the number of curves of the second communication pipe is greater than the number of curves of the third communication pipe.

4. The battery pack according to claim 2, wherein the third communication pipe penetrates a cross beam of the second frame so as to be connected to the third battery module.

5. The output pipe set 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 connected to the first output pipe, the second output pipe, and the third output pipe The battery pack according to claim 1.

6. The battery pack according to claim 5, wherein the total pipe length of the second pipe set and the second output pipe is equal to the total pipe length of the third pipe set and the third output pipe.

7. The battery pack according to claim 5, wherein the number of curves of the second output pipe is greater than the number of curves of the third output pipe.

8. The battery pack further includes a bus bar connection assembly, the front cover further has a positive terminal and a negative terminal, and the bus bar connection assembly includes a positive bus bar electrically connected to the positive terminal, a first bus bar set disposed on the first side portion and electrically connected in series to the positive bus bar and the plurality of first battery modules, a second bus bar set disposed on the second side portion and electrically connected in series to the plurality of second battery modules, a third bus bar set disposed on the second side portion and electrically connected in series to the plurality of third battery modules, a negative bus bar electrically connected to the negative terminal, and a cable set disposed at the rear portion to establish series connections between the first bus bar set and the second bus bar set, between the second bus bar set and the third bus bar set, and between the third bus bar set and the first bus bar set, respectively The battery pack according to claim 1.

9. The cable set includes a first cable unit electrically connected to the first battery module and the second battery module, a second cable unit electrically connected to the second battery module and the third battery module, a third cable unit electrically connected to the third battery module and the first battery module comprising the battery pack according to claim 8, wherein the second cable unit penetrates a cross beam so as to be electrically connected to the third battery module, and the third cable unit penetrates a cross beam so as to be electrically connected to the first bus bar set

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 outer protrusion connected to at least one other battery pack so as to form a battery pack assembly

11. A battery pack, a casing having a first frame, a second frame, and at least one third frame arranged in order from top to bottom, the casing further having a front cover that removably covers the front portion of the casing, the front cover having a fluid inlet and a fluid outlet, a casing, a plurality of first battery modules arranged in the first frame, a plurality of second battery modules arranged in the second frame, a plurality of third battery modules arranged in the at least one third frame, a pipe assembly, an input pipe connected to the fluid inlet, a first pipe set arranged on a first side portion of the casing, connected to the input pipe, and connected in series to the plurality of first battery modules in the first frame, a first pipe set, a second pipe set arranged on a second side portion of the casing opposite to the first side portion, and connected in series to the plurality of second battery modules in the second frame, a third pipe set arranged on the second side portion of the casing, and connected in series to the plurality of third battery modules in the third frame, an output pipe set connected to the second battery module, the third battery module, and the fluid outlet, a communication pipe set arranged at the rear portion of the casing, connected to the first battery module, and connected in parallel to the second battery module and the third battery module a pipe assembly comprising A battery pack, and A pump connected to the fluid inlet and the fluid outlet, and A thermal management module connected to the pump for thermal management of the battery pack by controlling the pump to pump fluid to the battery pack in an immersion cooling method A battery system comprising the same. **Claim 12** The communication pipe set includes 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 connected to the first communication pipe, the second communication pipe, and the third communication pipe The battery system according to claim 11, comprising the same. **Claim 13** The battery system according to claim 12, wherein the number of curves of the second communication pipe is greater than the number of curves of the third communication pipe. **Claim 14** The battery system according to claim 12, wherein the third communication pipe penetrates through the cross beam of the second frame so as to be connected to the third battery module. **Claim 15** The output pipe set 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 connected to the first output pipe, the second output pipe, and the third output pipe The battery system according to claim 11, comprising the same. **Claim 16** The battery system according to claim 15, wherein the sum of the pipe lengths of the second pipe set and the second output pipe is equal to the sum of the pipe lengths of the third pipe set and the third output pipe. **Claim 17** The battery system according to claim 15, wherein the number of curves of the second output pipe is greater than the number of curves of the third output pipe. **Claim 18** The battery pack further includes a bus bar connection assembly, the front cover further has a positive terminal and a negative terminal, and the bus bar connection assembly includes A positive bus bar electrically connected to the positive terminal, A first bus bar set disposed on the first side portion and electrically connected in series to the positive bus bar and the plurality of first battery modules, A second bus bar set disposed on the second side portion and electrically connected in series to the plurality of second battery modules A third bus bar set disposed on the second side portion and electrically connected in series to the plurality of third battery modules; A negative electrode bus bar electrically connected to the negative electrode terminal; A cable set disposed at the rear portion to establish a series connection between the first bus bar set and the second bus bar set, a series connection between the second bus bar set and the third bus bar set, and a series connection between the third bus bar set and the first bus bar set respectively; The battery system according to claim 11, comprising:

19. The cable set is: A first cable unit electrically connected to the first battery module and the second battery module; A second cable unit electrically connected to the second battery module and the third battery module; A third cable unit electrically connected to the third battery module and the first battery module; Comprising: The second cable unit penetrates a cross beam so as to be electrically connected to the third battery module, and the third cable unit penetrates a cross beam so as to be electrically connected to the first bus bar set. The battery system according to claim 18.

20. At least one of the first frame, the second frame, and the at least one third frame has at least one outer protrusion connected to at least one other battery pack so as to form a battery pack assembly. The battery system according to claim 11.

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