Battery pack

Abstract

The utility model provides a battery pack, a box body of the battery pack is provided with a containing cavity, a liquid inlet part and a liquid outlet part, the liquid inlet part and the liquid outlet part are communicated with the containing cavity, and the liquid outlet part is communicated with the liquid inlet part through the containing cavity; the plurality of battery modules are arranged in the accommodating cavity, the plurality of battery modules are arranged at intervals in a preset direction, and a flowing channel is formed between every two adjacent battery modules in a surrounding manner, so that a cooling medium flows; the flow blocking structures make contact with at least parts of the side faces, facing each other, of the two adjacent battery modules or have preset gaps, and one ends of the flow blocking structures make contact with at least parts of the bottom wall of the box body or have preset gaps, so that flowing of the cooling media in the flowing channels is blocked or slowed down; wherein the liquid inlet part is communicated with the liquid outlet part through the flowing channel. According to the utility model, the problem that the utilization rate of the cooling medium of the battery pack in the prior art is low is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery technology, and more specifically, to a battery pack. Background Technology

[0002] Currently, with the widespread application of energy storage battery packs, users have increasingly stringent requirements for the various performance aspects of energy storage battery packs. Energy storage battery packs generate a large amount of heat during charging and discharging. If this heat cannot be dissipated in time, it will lead to poor thermal management of the energy storage battery pack, which will not only affect the user experience of consumers, but may even affect their personal safety in severe cases.

[0003] In existing technologies, to avoid poor thermal management of energy storage battery packs, energy storage battery packs are usually used in conjunction with cooling systems. By immersing the battery cells in an insulating liquid, the thermal conductivity of the liquid is used to effectively control the battery temperature, thereby improving its performance and safety.

[0004] However, due to the anisotropic thermal conductivity of the battery itself, the temperature at the end of the battery pack is lower than that in the middle. When the insulating liquid flows to the end of the battery pack, it does not need to cool the battery end much before flowing out of the battery pack, resulting in low utilization of the insulating liquid. Utility Model Content

[0005] The main objective of this invention is to provide a battery pack that solves the problem of low utilization rate of cooling medium in existing battery packs.

[0006] To achieve the above objectives, this utility model provides a battery pack, comprising: a housing having a receiving cavity and an inlet and an outlet communicating with the receiving cavity, the outlet communicating with the inlet through the receiving cavity; multiple battery modules disposed within the receiving cavity, the multiple battery modules being spaced apart along a predetermined direction, with adjacent battery modules forming a flow channel for the flow of cooling medium; and a flow-blocking structure, the flow-blocking structure being in contact with at least a portion of the sides of two adjacent battery modules facing each other or having a predetermined gap, one end of the flow-blocking structure being in contact with at least a portion of the bottom wall of the housing or having a predetermined gap, to block or slow down the flow of cooling medium in the flow channel; wherein, the inlet communicating with the outlet through the flow channel.

[0007] Furthermore, there are multiple flow-blocking structures, and two flow-blocking structures arranged opposite each other form a flow-blocking assembly. The two flow-blocking structures in each flow-blocking assembly are located at both ends of the flow channel.

[0008] Furthermore, the flow-blocking structure includes: a connecting portion connected to at least one battery module; and a flow-blocking portion disposed on the connecting portion, one end of which contacts at least a portion of the bottom wall of the housing or has a preset gap, and the flow-blocking portion contacts at least a portion of the sides of two adjacent battery modules facing each other or has a preset gap.

[0009] Furthermore, the flow-blocking part is plate-shaped and includes a first plate and a second plate that are connected to each other. The first plate, the second plate, and at least a portion of the connecting part surround each other to form a receiving space. In the process of connecting the connecting part to at least one battery module between two adjacent battery modules, the first plate contacts at least a portion of the end face of one of the battery modules or has a preset gap, and at least a portion of the battery module is located within the receiving space. The side of the second plate away from the battery module contacts at least a portion of the side face of the other battery module or has a preset gap.

[0010] Furthermore, when one end of the flow-blocking part has a preset gap with at least a portion of the bottom wall of the housing, the preset gap C1 between one end of the flow-blocking part and at least a portion of the bottom wall of the housing satisfies: 8mm≤C1≤12mm; when the side of the second plate away from the receiving space has a preset gap with at least a portion of the side of the battery module, the preset gap C2 between the side of the second plate away from the receiving space and at least a portion of the side of the battery module satisfies: 8mm≤C2≤12mm.

[0011] Furthermore, the housing also has an overflow chamber and a buffer chamber, both of which are connected to the receiving chamber. The bottom wall of the buffer chamber has a through hole. The battery pack also includes cables, one end of which is connected to multiple battery modules, and the other end of which extends out of the buffer chamber through the through hole. The liquid outlet is located on the bottom wall of the overflow chamber. The height H1 of the bottom wall of the overflow chamber and the height H2 of the bottom wall of the buffer chamber satisfy the condition: H1 < H2.

[0012] Furthermore, the bottom wall of the buffer cavity is set at an angle A with the horizontal plane, and the angle A satisfies: 1°≤A≤3°.

[0013] Furthermore, multiple battery modules are connected in series, with two through holes spaced apart along a preset direction; there are two cables, along a preset direction, with one end of one cable connected to the first battery module and the other end passing through one of the through holes; one end of the other cable is connected to the last battery module and the other end passes through the other through hole.

[0014] Furthermore, the battery pack also includes fasteners that are sleeved on the cable, with at least a portion of the fasteners located inside the through hole and connected to the hole wall.

[0015] Furthermore, the battery pack also includes a sealing compound, which is disposed between the cable and the wall of the through hole to seal the gap between the cable and the wall of the through hole.

[0016] According to the technical solution of this utility model, the battery pack housing has a receiving cavity and a liquid inlet and a liquid outlet communicating with the receiving cavity. The liquid outlet communicates with the liquid inlet through the receiving cavity. Multiple battery modules are arranged within the receiving cavity, spaced apart along a predetermined direction. Adjacent battery modules form a flow channel to allow the cooling medium to flow. A flow-blocking structure contacts at least a portion of the sides of adjacent battery modules facing each other or has a predetermined gap. One end of the flow-blocking structure contacts at least a portion of the bottom wall of the housing or has a predetermined gap to block or slow down the flow of the cooling medium within the flow channel. The liquid inlet communicates with the liquid outlet through the flow channel. In this way, the cooling medium flows from the bottom of the battery modules and the flow channel to the liquid outlet, achieving cooling and heat dissipation for the battery modules and ensuring the reliability of the battery pack's heat dissipation. Meanwhile, the anisotropy of the battery results in a lower end temperature for the battery module. The aforementioned baffle structure obstructs the flow of the cooling medium as it reaches the baffle, slowing or preventing its further flow to the end of the battery module. This avoids further cooling of the battery module's end by the cooling medium, concentrating it primarily on the heat-generating parts of the battery module, further reducing their temperature. This improves the heat dissipation performance of the battery module, increases the utilization rate of the cooling medium, and enhances its cooling efficiency, thus solving the problem of low cooling medium utilization in existing battery packs. Furthermore, the baffle structure optimizes the flow path of the cooling medium, guiding it and preventing direct collisions between the cooling medium and the side walls of the housing, as well as collisions between cooling media flowing in different directions. This prevents turbulence at the battery module end, ensuring cooling stability and resulting in a more uniform temperature distribution within the battery module. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A perspective view of the overall structure of an embodiment of the battery pack according to the present invention is shown;

[0019] Figure 2 It shows Figure 1 A magnified view of the fasteners for the battery pack being installed in the through holes;

[0020] Figure 3 It shows Figure 1 Side view of the battery pack in the middle;

[0021] Figure 4 It shows Figure 1 A partial structural perspective view of the battery pack in the image;

[0022] Figure 5 It shows Figure 4 A magnified view of a portion of the image;

[0023] Figure 6 It shows Figure 4 A partial structural side view of the battery pack in the image;

[0024] Figure 7 It shows Figure 4 A partial structural cross-sectional view of the battery pack in the image;

[0025] Figure 8 It shows Figure 1 A 3D diagram of the current-blocking structure of the battery pack.

[0026] The above figures include the following reference numerals:

[0027] 10. Housing; 11. Receiving cavity; 12. Overflow cavity; 13. Buffer cavity; 131. Through hole; 14. Liquid outlet;

[0028] 20. Battery module; 21. Flow channel;

[0029] 30. Flow-blocking structure; 31. Connecting part; 32. Flow-blocking part; 321. First plate; 322. Second plate; 33. Accommodation space;

[0030] 40. Cables;

[0031] 50. Fasteners. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] In this utility model, unless otherwise stated, directional terms such as "upper" and "lower" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0035] To address the problem of low utilization rate of cooling medium in existing battery packs, this application provides a battery pack.

[0036] like Figures 1 to 8 As shown, the battery pack includes a housing 10, multiple battery modules 20, and a flow-blocking structure 30. The housing 10 has a receiving cavity 11 and a liquid inlet and a liquid outlet 14 communicating with the receiving cavity 11. The liquid outlet 14 communicates with the liquid inlet through the receiving cavity 11. Multiple battery modules 20 are disposed within the receiving cavity 11, spaced apart along a predetermined direction. A flow channel 21 is formed between adjacent battery modules 20 to allow the flow of cooling medium. The flow-blocking structure 30 contacts at least a portion of the sides of adjacent battery modules 20 facing each other or has a predetermined gap. One end of the flow-blocking structure 30 contacts at least a portion of the bottom wall of the housing 10 or has a predetermined gap to block or slow the flow of cooling medium within the flow channel 21. The liquid inlet communicates with the liquid outlet 14 through the flow channel 21.

[0037] Applying the technical solution of this embodiment, the battery pack housing 10 has a receiving cavity 11 and a liquid inlet and a liquid outlet 14 communicating with the receiving cavity 11. The liquid outlet 14 is connected to the liquid inlet through the receiving cavity 11. Multiple battery modules 20 are disposed within the receiving cavity 11, spaced apart along a predetermined direction. A flow channel 21 is formed between adjacent battery modules 20 to allow the flow of cooling medium. A flow-blocking structure 30 contacts at least a portion of the sides of two adjacent battery modules 20 facing each other or has a predetermined gap. One end of the flow-blocking structure 30 contacts at least a portion of the bottom wall of the housing 10 or has a predetermined gap to block or slow down the flow of cooling medium within the flow channel 21. The liquid inlet is connected to the liquid outlet 14 through the flow channel 21. Thus, the cooling medium flows from the bottom of the battery modules 20 and through the flow channel 21 to the liquid outlet 14, achieving cooling and heat dissipation of the battery modules 20 and ensuring reliable heat dissipation of the battery pack. Meanwhile, the anisotropy of the battery results in a lower end temperature for the battery module 20. The aforementioned design of the flow-blocking structure 30 allows the cooling medium to be blocked when it flows to the end of the battery module 20, slowing or preventing further cooling. This concentrates the cooling medium primarily on the heat-generating parts of the battery module 20, further reducing their temperature and improving its heat dissipation performance. This increases the utilization rate and cooling effect of the cooling medium, thus solving the problem of low cooling medium utilization in existing battery packs. Furthermore, the flow-blocking structure 30 optimizes the flow path of the cooling medium, guiding it and preventing direct collisions with the side walls of the housing 10 or collisions between cooling media in different directions. This prevents turbulence at the end of the battery module 20, ensuring cooling stability and a more uniform temperature distribution within the battery module 20.

[0038] In this embodiment, the cooling medium is an insulating liquid.

[0039] In this embodiment, four battery modules 20 are provided.

[0040] It should be noted that the number of battery modules 20 is not limited to this and can be adjusted according to working conditions and usage requirements. Optionally, the number of battery modules 20 can be three, five, eight, nine, or more.

[0041] In this embodiment, the housing 10 is rectangular, with the preset direction being the width direction of the housing 10, and the four battery modules 20 are spaced apart along the width direction of the housing 10.

[0042] In this embodiment, the liquid inlet is provided on the housing and is located in the middle of the housing. The cooling medium flows from the middle of the battery module 20 to both ends of the battery module 20 through the liquid inlet.

[0043] Specifically, there are multiple flow-blocking structures 30, and two oppositely arranged flow-blocking structures 30 form a flow-blocking assembly. The two flow-blocking structures 30 in each assembly are located at opposite ends of the flow channel 21. In this way, within the battery pack, the flow-blocking structures 30 can obstruct the cooling medium at both ends of the flow channel 21, allowing the cooling medium flowing to both ends of the flow channel 21 to be concentrated on the heat-generating parts of the battery module 20. This improves the heat dissipation reliability of the battery pack, further enhances the utilization rate of the cooling medium, and increases the cooling efficiency of the cooling medium.

[0044] like Figure 5 and Figure 8 As shown, the flow-blocking structure 30 includes a connecting portion 31 and a flow-blocking portion 32. The connecting portion 31 is connected to at least one battery module 20. The flow-blocking portion 32 is disposed on the connecting portion 31, with one end of the flow-blocking portion 32 in contact with at least a portion of the bottom wall of the housing 10 or having a predetermined gap, and the flow-blocking portion 32 in contact with at least a portion of the sides of two adjacent battery modules 20 facing each other or having a predetermined gap. In this way, the flow-blocking structure 30 achieves connection with the battery module 20 through the connecting portion 31, and achieves obstruction or slowing of the flowing medium through the flow-blocking portion 32. At the same time, the above configuration makes the installation and removal of the flow-blocking structure 30 in the battery pack simpler, reduces the installation difficulty for workers, and improves the work efficiency of workers.

[0045] In this embodiment, the connecting part 31 is connected to both adjacent battery modules 20 to ensure the stable installation of the flow blocking structure 30.

[0046] Specifically, the connecting part 31 is plate-shaped, and at least part of the connecting part 31 is inserted into two adjacent battery modules 20 to reduce the installation difficulty for workers.

[0047] like Figure 5 and Figure 8As shown, the flow-blocking portion 32 is plate-shaped and includes a first plate 321 and a second plate 322 connected to each other. The first plate 321, the second plate 322, and at least a portion of the connecting portion 31 surround each other to form a receiving space 33. During the connection process between two adjacent battery modules 20, when the connecting portion 31 connects to at least one battery module 20, the first plate 321 contacts at least a portion of the end face of one of the battery modules 20 or has a predetermined gap, and at least a portion of that battery module 20 is located within the receiving space 33. The side of the second plate 322 away from the battery module 20 contacts at least a portion of the side face of the other battery module 20 or has a predetermined gap. In this way, after the operator inserts the connecting part 31 into two adjacent battery modules 20, the first plate 321 of the flow-blocking part 32 contacts or leaves a preset gap with the end face of one of the battery modules 20. At least a portion of the battery module 20 is located within the receiving space 33. When the cooling medium flows in the flow channel 21, a portion of the cooling medium flows to the first plate 321 and is blocked by the first plate 321, while a portion of the cooling medium is blocked by the second plate 322, ensuring a reduction in the flow velocity of the cooling medium. Simultaneously, the arrangement of the first plate 321 also enables the positioning of the flow-blocking structure 30, ensuring smooth installation and stability of the flow-blocking structure 30. Furthermore, the plate-shaped arrangement of the flow-blocking part 32 simplifies its formation, reduces the processing difficulty for operators, and lowers the processing cost of the flow-blocking structure 30.

[0048] In this embodiment, the flow-blocking part 32 is integrally formed. This design achieves structural strength for the flow-blocking part 32 and ensures its reliable flow-blocking capability.

[0049] In this embodiment, the first plate 321 is in contact with the end face of the battery module 20 to ensure the installation stability of the flow blocking structure 30.

[0050] like Figures 4 to 6As shown, when one end of the baffle 32 has a preset gap with at least a portion of the bottom wall of the housing 10, the preset gap C1 between the one end of the baffle 32 and at least a portion of the bottom wall of the housing 10 satisfies: 8mm ≤ C1 ≤ 12mm. When the side of the second plate 322 away from the receiving space 33 has a preset gap with at least a portion of the side of the battery module 20, the preset gap C2 between the side of the second plate 322 away from the receiving space 33 and at least a portion of the side of the battery module 20 satisfies: 8mm ≤ C2 ≤ 12mm. Thus, the above arrangement ensures that during the process of the cooling medium passing through the baffle structure 30, while the baffle structure 30 blocks the cooling medium, it also ensures that a portion of the cooling medium flows to the end of the battery module 20, guaranteeing the cooling reliability and high utilization rate of the cooling medium, as well as the overall heat dissipation reliability of the battery module 20, achieving temperature uniformity of the battery module 20. Simultaneously, the above arrangement makes the values ​​of the preset gaps C1 and C2 more flexible and diverse, improving the processing flexibility of the operators.

[0051] In this embodiment, one end of the flow-blocking part 32 has a preset gap C1 with at least a portion of the bottom wall of the housing 10, and the value of C1 satisfies: C1 = 10 mm.

[0052] In this embodiment, at least a portion of the side of the second plate 322 away from the accommodating space 33 and the side of the battery module 20 have a preset gap C2, the value of which satisfies: C2 = 10mm.

[0053] In an embodiment not shown in the accompanying drawings, one end of the flow-blocking portion contacts at least a portion of the bottom wall of the housing, and the side of the second plate away from the receiving space has a predetermined gap C2 with at least a portion of the side of the battery module.

[0054] In an embodiment not shown in the accompanying drawings, one end of the baffle is in contact with at least a portion of the bottom wall of the housing, and the side of the second plate away from the receiving space is in contact with at least a portion of the side of the battery module.

[0055] In an embodiment not shown in the accompanying drawings, one end of the flow-blocking portion has a predetermined gap C1 with at least a portion of the bottom wall of the housing, and the side of the second plate away from the receiving space is in contact with at least a portion of the side of the battery module.

[0056] like Figures 1 to 3As shown, the housing 10 also has an overflow chamber 12 and a buffer chamber 13, both of which are connected to the receiving chamber 11. The bottom wall of the buffer chamber 13 has a through hole 131. The battery pack also includes a cable 40, one end of which is connected to multiple battery modules 20, and the other end of which extends out of the buffer chamber 13 through the through hole 131. A liquid outlet 14 is located on the bottom wall of the overflow chamber 12, and the height H1 of the bottom wall of the overflow chamber 12 and the height H2 of the bottom wall of the buffer chamber 13 satisfy the condition: H1 < H2. Thus, the cooling medium flows from the receiving chamber 11 and the flow channel 21 to the overflow chamber 12, and then through the overflow chamber 12 to the liquid outlet 14, and then flows out through the liquid outlet 14. The cable 40 connected to the battery modules 20 is connected to the outside through the through hole 131 to realize the power supply function of the battery pack. The liquid outlet 14 is located on the bottom wall of the overflow chamber 12. The relationship between the height H1 of the bottom wall of the overflow chamber 12 and the height H2 of the bottom wall of the buffer chamber 13 ensures that the through hole 131 is always higher than the cooling medium, preventing the cooling medium from leaking to the outside of the housing 10 through the cable 40. This ensures the sealing reliability of the housing 10, the sealing performance of the battery pack, the operational reliability of the battery pack, and the safety of the battery pack.

[0057] like Figure 2 and Figure 3 As shown, the bottom wall of the buffer chamber 13 is set at an angle A with the horizontal plane, and the angle A satisfies: 1°≤A≤3°. In this way, once the cooling medium flows to the through hole 131 due to external force, the inclined setting of the bottom wall of the buffer chamber 13 can guide the flow of the cooling medium, avoid the accumulation of the cooling medium at the through hole 131, further ensure the sealing of the housing 10, and improve the sealing and operational reliability of the battery pack.

[0058] In this embodiment, the included angle A satisfies the following condition: A = 2°.

[0059] like Figure 1 As shown, multiple battery modules 20 are connected in series, with two through holes 131 spaced apart along a predetermined direction. Two cables 40 are also connected along the predetermined direction. One cable 40 is connected at one end to the first battery module 20, and the other end passes through one of the through holes 131. The other cable 40 is connected at one end to the last battery module 20, and the other end passes through the other through hole 131. In this way, the battery modules 20 are connected in series to form a single unit, requiring only two cables 40 to ensure reliable power supply to the battery pack. This reduces the number of cables 40 used, thereby lowering the risk of cooling medium leakage and improving the sealing reliability and operational safety of the battery pack.

[0060] In this embodiment, each battery module 20 is provided with a PCB board, which is used to collect data from the battery module 20. By connecting the PCBs in series, the battery modules 20 are connected in series.

[0061] like Figure 2 As shown, the battery pack also includes fasteners 50, which are sleeved on the cable 40. At least a portion of the fasteners 50 is located within the through hole 131 and connected to the wall of the through hole 131. Thus, when the operator sleeves the fasteners 50 onto the cable 40 and installs them in the through hole 131, the fasteners 50 connect to the wall of the through hole 131, ensuring a tight connection between the cable 40 and the through hole 131. This further improves the sealing performance of the housing 10, enhancing the sealing and safety of the battery pack. Simultaneously, the fasteners 50 secure the cable 40, ensuring the installation stability and communication reliability of the cable 40.

[0062] In this embodiment, the fastener 50 is a gland head. This means that the fastener 50 is a standard part, eliminating the need for workers to design and manufacture specific fasteners 50 individually, thus reducing the production cost of the battery pack and achieving economic efficiency.

[0063] Specifically, the battery pack casing has an IP68 protection rating.

[0064] Optionally, the battery pack also includes a sealant, which is disposed between the cable 40 and the wall of the through hole 131 to seal the gap between them. This allows operators to seal the gap between the cable 40 and the wall of the through hole 131, ensuring the sealing reliability of the housing 10 and the overall sealing and safety of the battery pack. Simultaneously, the sealant can also secure the cable 40, ensuring reliable communication. Furthermore, the sealant is adaptable to cables 40 of different sizes, improving the battery pack's versatility while maintaining its sealing performance.

[0065] In this embodiment, the sealing adhesive is a waterproof adhesive.

[0066] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0067] The battery pack housing has a receiving cavity and a liquid inlet and a liquid outlet communicating with the receiving cavity. The liquid outlet communicates with the liquid inlet through the receiving cavity. Multiple battery modules are arranged within the receiving cavity, spaced apart along a predetermined direction. Adjacent battery modules form a flow channel to allow cooling medium to flow. A baffle structure contacts or has a predetermined gap with at least a portion of the sides of adjacent battery modules facing each other. One end of the baffle structure contacts or has a predetermined gap with at least a portion of the bottom wall of the housing to block or slow down the flow of cooling medium within the flow channel. The liquid inlet communicates with the liquid outlet through the flow channel. In this way, the cooling medium flows from the bottom of the battery modules and through the flow channel to the liquid outlet, achieving cooling and heat dissipation for the battery modules and ensuring reliable heat dissipation of the battery pack. Meanwhile, the anisotropy of the battery results in a lower end temperature for the battery module. The aforementioned baffle structure obstructs the flow of the cooling medium as it reaches the baffle, slowing or preventing its further flow to the end of the battery module. This avoids further cooling of the battery module's end by the cooling medium, concentrating it primarily on the heat-generating parts of the battery module, further reducing their temperature. This improves the heat dissipation performance of the battery module, increases the utilization rate of the cooling medium, and enhances its cooling efficiency, thus solving the problem of low cooling medium utilization in existing battery packs. Furthermore, the baffle structure optimizes the flow path of the cooling medium, guiding it and preventing direct collisions between the cooling medium and the side walls of the housing, as well as collisions between cooling media flowing in different directions. This prevents turbulence at the battery module end, ensuring cooling stability and resulting in a more uniform temperature distribution within the battery module.

[0068] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0070] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The housing (10) has a receiving cavity (11) and a liquid inlet and a liquid outlet (14) communicating with the receiving cavity (11), wherein the liquid outlet (14) is connected to the liquid inlet through the receiving cavity (11); Multiple battery modules (20) are disposed in the receiving cavity (11). The multiple battery modules (20) are spaced apart along a preset direction. A flow channel (21) is formed between two adjacent battery modules (20) to allow the flow of cooling medium. A flow-blocking structure (30) is provided, wherein the flow-blocking structure (30) is in at least partial contact with or has a preset gap with the sides of two adjacent battery modules (20) facing each other, and one end of the flow-blocking structure (30) is in at least partial contact with or has a preset gap with the bottom wall of the housing (10) to block or slow down the flow of the cooling medium in the flow channel. The liquid inlet is connected to the liquid outlet (14) through the flow channel (21).

2. The battery pack according to claim 1, characterized in that, There are multiple flow-blocking structures (30), and two flow-blocking structures (30) arranged opposite to each other form a flow-blocking assembly. The two flow-blocking structures (30) in each flow-blocking assembly are located at both ends of the flow channel (21).

3. The battery pack according to claim 2, characterized in that, The flow-blocking structure (30) includes: The connecting part (31) is connected to at least one of the battery modules (20); A flow-blocking part (32) is disposed on the connecting part (31). One end of the flow-blocking part (32) is in contact with at least a portion of the bottom wall of the housing (10) or has a preset gap. The flow-blocking part (32) is in contact with at least a portion of the sides of the two adjacent battery modules (20) facing each other or has a preset gap.

4. The battery pack according to claim 3, characterized in that, The flow-blocking part (32) is plate-shaped and includes a first plate (321) and a second plate (322) connected to each other. The first plate (321), the second plate (322) and at least part of the connecting part (31) surround each other to form an accommodating space (33). In the process of connecting the connecting part (31) to at least one of the battery modules (20) between two adjacent battery modules (20), the first plate (321) contacts at least a portion of the end face of one of the battery modules (20) or has a preset gap, at least a portion of the battery module (20) is located in the receiving space (33), and the side of the second plate (322) away from the battery module (20) contacts at least a portion of the side face of the other battery module (20) or has a preset gap.

5. The battery pack according to claim 4, characterized in that, When one end of the flow-blocking part (32) has a preset gap with at least a portion of the bottom wall of the box (10), the preset gap C1 between one end of the flow-blocking part (32) and at least a portion of the bottom wall of the box (10) satisfies: 8mm≤C1≤12mm; When the side of the second plate (322) away from the receiving space (33) has a preset gap with at least a portion of the side of the battery module (20), the preset gap C2 between the side of the second plate (322) away from the receiving space (33) and at least a portion of the side of the battery module (20) satisfies: 8mm≤C2≤12mm.

6. The battery pack according to claim 1, characterized in that, The housing (10) also has an overflow cavity (12) and a buffer cavity (13), both of which are connected to the receiving cavity (11). The bottom wall of the buffer cavity (13) has a through hole (131). The battery pack also includes a cable (40), one end of which is connected to the plurality of battery modules (20), and the other end of which passes through the through hole (131) and extends out of the buffer cavity (13). The liquid outlet (14) is disposed on the bottom wall of the overflow cavity (12), and the height H1 of the bottom wall of the overflow cavity (12) and the height H2 of the bottom wall of the buffer cavity (13) satisfy: H1 < H2.

7. The battery pack according to claim 6, characterized in that, The bottom wall of the buffer cavity (13) is set at an angle A with the horizontal plane, and the angle A satisfies: 1°≤A≤3°.

8. The battery pack according to claim 6, characterized in that, Multiple battery modules (20) are connected in series. There are two through holes (131), and the two through holes (131) are spaced apart along the preset direction; There are two cables (40) along the preset direction. One end of one cable (40) is connected to the first battery module (20), and the other end of the cable (40) passes through one of the through holes (131). One end of another cable (40) is connected to the last battery module (20), and the other end of the cable (40) passes through another of the through holes (131).

9. The battery pack according to claim 7, characterized in that, The battery pack also includes fasteners (50) that are sleeved on the cable (40), and at least a portion of the fasteners (50) are located within the through hole (131) and connected to the wall of the through hole (131).

10. The battery pack according to claim 7, characterized in that, The battery pack also includes a sealing colloid disposed between the cable (40) and the wall of the through hole (131) to seal the gap between the cable (40) and the wall of the through hole (131).

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