Battery module and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module and a battery pack. The battery module comprises a battery cell group, wherein the battery cell group comprises a plurality of battery cells which are stacked side by side along a first direction; the end plate is arranged on one side, in the first direction, of the battery cell group, a first cooling channel is formed in the end plate, and a fluid opening communicated with the first cooling channel is formed in the end plate; the cooling plates are arranged on the two sides of the battery cell group at intervals in the second direction, second cooling channels are formed in the cooling plates, and the second direction is perpendicular to the first direction; and one end of the connecting pipe is detachably connected with the first cooling channel, and the other end of the connecting pipe is detachably connected with the second cooling channel, so that the first cooling channel is communicated with the second cooling channel. According to the battery module, the pipeline structure of the battery module can be simplified, and the detachable connecting pipe can be conveniently replaced when the detachable connecting pipe breaks down or is damaged, so that the whole cooling system does not need to be subjected to large-scale maintenance or replacement, and the maintenance cost is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery module and battery pack. Background Technology

[0002] During use, batteries frequently operate under high-power discharge conditions, generating a significant amount of heat. To ensure long-term, stable operation, a cooling system is necessary within the battery to dissipate heat.

[0003] The relevant technology cools the battery by connecting external cooling pipes to the cooling plate, but this cooling structure has a large number of pipes and is relatively complex. Utility Model Content

[0004] This application discloses a battery module and battery pack, which can simplify the pipeline structure of the battery module.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application disclose a battery module, comprising:

[0006] A battery cell assembly, the battery cell assembly comprising a plurality of battery cells stacked side by side along a first direction;

[0007] An end plate is provided on one side of the battery cell assembly along the first direction. The end plate has a first cooling channel and a fluid port connected to the first cooling channel. Cooling medium flows into or out of the end plate through the fluid port.

[0008] A cooling plate is provided on both sides of the battery cell assembly at intervals along a second direction, and a second cooling channel is provided in the cooling plate, wherein the second direction is perpendicular to the first direction.

[0009] A connecting pipe, one end of which is detachably connected to the first cooling channel and the other end of which is detachably connected to the second cooling channel, so that the first cooling channel and the second cooling channel are connected.

[0010] In one alternative embodiment, the first cooling channel extends through the surface of the end plate in a second direction to form a first communication port, the cooling plate has a second communication port formed on the surface of the first communication port, the second cooling channel extends in a first direction to connect to the second communication port, and the first communication port and the second communication port are connected by the connecting pipe.

[0011] In one optional embodiment, a sealing structure is provided between the connecting pipe and the first cooling channel, as well as between the connecting pipe and the second cooling channel.

[0012] In one optional embodiment, the sealing structure includes a sleeve and a plurality of annular protrusions distributed along the axial direction of the sleeve, the sleeve being fitted onto the end of the connecting pipe, and the plurality of annular protrusions being distributed on the outer peripheral surface of the sleeve.

[0013] In one optional embodiment, one end of the connecting pipe is inserted into the first cooling channel, and the other end is inserted into the second cooling channel;

[0014] The height of the plurality of annular protrusions in each of the sealing structures gradually decreases from the direction in which the connecting pipe is inserted into the first cooling channel or the second cooling channel.

[0015] In one alternative embodiment, the height of the plurality of annular protrusions of each sealing structure gradually increases from both ends of the sleeve towards the middle of the sleeve.

[0016] In an optional embodiment, the first cooling channel extends through the surface of the end plate in a second direction to form a first communication port, the cooling plate has a second communication port formed on the surface of the first communication port, the second cooling channel extends in a first direction to connect to the second communication port, and the first communication port and the second communication port are connected by the connecting pipe.

[0017] The first end of the connecting pipe is inserted into the first cooling channel, and the end of the first cooling channel near the first communication port forms a first stepped surface, which is used to limit the insertion depth of the connecting pipe into the first cooling channel; and / or, the second end of the connecting pipe is inserted into the second cooling channel, and the end of the second cooling channel near the second communication port forms a second stepped surface, which is used to limit the insertion depth of the connecting pipe into the second cooling channel.

[0018] In one optional embodiment, the first connection port and the second connection port are disposed opposite each other in a second direction, and the distance between the first step surface and the second step surface is greater than the length of the connecting pipe.

[0019] In one optional embodiment, the number of battery cell groups is multiple, and each battery cell group has an end plate corresponding to one side along the first direction; the first cooling channel in each end plate and the second cooling channel in the two cooling plates adjacent to the end plate are connected by the connecting pipe.

[0020] In one optional embodiment, the battery module includes a water inlet connector and a water outlet connector, the water inlet connector and the water outlet connector being respectively located at the fluid ports of two different end plates.

[0021] In one alternative embodiment, the inlet connector and the outlet connector are offset in a second direction.

[0022] In one alternative embodiment, the battery module further includes an insulating pad disposed between the end plate and the cell assembly.

[0023] Secondly, this application provides a battery pack including the battery module described in any of the above embodiments.

[0024] Compared with related technologies, the beneficial effects of this application are:

[0025] In this application, a first cooling channel is provided inside the end plate, and a second cooling channel is provided inside the cooling plate. The first cooling channel and the second cooling channel are connected by a connecting pipe. In this way, the cooling medium can circulate directly between the end plate and the cooling plate through the first cooling channel inside the end plate, eliminating the need to lay a large number of external pipelines to transport the cooling medium, thereby greatly reducing the number of external pipelines used and simplifying the pipeline structure of the battery module.

[0026] In addition, one end of the connecting pipe of this application is detachably connected to the first cooling channel, and the other end of the connecting pipe is detachably connected to the second cooling channel. The detachable connecting pipe can be easily replaced when it malfunctions or is damaged, without the need for large-scale repair or replacement of the entire cooling system, thereby reducing maintenance costs and downtime. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the battery module structure disclosed in the embodiments of this application;

[0029] Figure 2 This is a partial structural schematic diagram of the battery module disclosed in the embodiments of this application;

[0030] Figure 3 This is a cross-sectional view of a portion of the battery module structure disclosed in an embodiment of this application;

[0031] Figure 4 This is a cross-sectional view of the end plate disclosed in an embodiment of this application;

[0032] Figure 5 This is an assembly drawing of the connecting pipe and sealing structure disclosed in the embodiments of this application;

[0033] Figure 6 This is a flow path diagram of the cooling medium disclosed in the embodiments of this application;

[0034] Figure 7 This is a diagram showing the positional relationship between the end plate and the cooling plate disclosed in an embodiment of this application;

[0035] Figure 8 This is a diagram showing the positional relationship between the end plate and the cooling plate as disclosed in another embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 100. Battery cell assembly; 110. Battery cell; 200. End plate; 201. First end plate; 202. Second end plate; 210. First cooling channel; 211. First water inlet channel; 212. First water return channel; 220. First stepped surface; 230. Weight reduction hole; 300. Cooling plate; 301. First cooling plate; 302. Second cooling plate; 303. Third cooling plate; 310. Second stepped surface; 320. Second cooling channel; 400. Connecting pipe; 500. Sealing structure; 510. Sleeve; 520. Annular protrusion; 600. Water inlet connector; 700. Water outlet connector. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0040] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0041] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0042] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0043] The battery module and battery pack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0044] like Figures 1 to 8 As shown in the figure, this application discloses a battery module, including:

[0045] Battery cell assembly 100, battery cell assembly 100 includes cells along a first direction ( Figure 1 Multiple battery cells 110 are stacked side by side (in the direction indicated by the arrow y in the middle). For example, the first direction can be the thickness direction of the battery cell 110, that is, the arrangement direction of the two large surfaces of the battery cell 110.

[0046] An end plate 200 is disposed on one side of the cell assembly 100 along a first direction. The end plate 200 has a first cooling channel 210 and a fluid port communicating with the first cooling channel 210. Cooling medium flows into or out of the end plate 200 through the fluid port; the cooling medium can be a cooling liquid or a cooling gas. For example, a weight-reduction hole 230 may be provided in the end plate 200, which is separated from the first cooling channel 210. The weight-reduction hole 230 can reduce the weight and manufacturing cost of the end plate 200.

[0047] For example, the end plate 200 may include a front plate and a rear plate, which are respectively disposed on both sides of the cell assembly 100 along the first direction. The front plate and the rear plate can be used to clamp the cell assembly 100. The first cooling channel 210 may be disposed on at least one of the front plate and the rear plate. For example, both the front plate and the rear plate are provided with the first cooling channel 210; or one of the front plate and the rear plate is provided with the first cooling channel 210, while the other is not provided with the first cooling channel 210.

[0048] Cooling plate 300, cooling plate 300 along the second direction ( Figure 1 The cells are spaced apart on both sides of the battery pack 100 (in the direction indicated by the x-arrow line), and a second cooling channel 320 is provided inside the cooling plate 300.

[0049] A connecting pipe 400 is provided, one end of which is detachably connected to the first cooling channel 210 and the other end of which is detachably connected to the second cooling channel 320, so that the first cooling channel 210 and the second cooling channel 320 are connected.

[0050] In this application, the end plate 200 is provided with a first cooling channel 210, and the cooling plate 300 is provided with a second cooling channel 320. The first cooling channel 210 and the second cooling channel 320 are connected by a connecting pipe 400. In this way, the cooling medium can circulate directly between the end plate 200 and the cooling plate 300 through the first cooling channel 210 inside the end plate 200, eliminating the need to lay a large number of external pipelines to transport the cooling medium, thereby greatly reducing the number of external pipelines used and simplifying the pipeline structure of the battery module.

[0051] In addition, one end of the connecting pipe 400 is detachably connected to the first cooling channel 210, and the other end of the connecting pipe 400 is detachably connected to the second cooling channel 320. The detachable connecting pipe 400 can be easily replaced when it malfunctions or is damaged, without the need for large-scale repair or replacement of the entire cooling system, thereby reducing maintenance costs and downtime.

[0052] In one alternative embodiment, please refer to Figure 7 and Figure 8 A first cooling channel 210 extends through the surface of the end plate 200 along a second direction to form a first connecting port. A second connecting port is formed on the surface of the cooling plate 300 relative to the first connecting port. That is, the first connecting port and the second connecting port are arranged opposite to each other in the second direction. A second cooling channel 320 extends along a first direction to connect to the second connecting port. The first connecting port and the second connecting port are connected by a connecting pipe 400. In other words, the first connecting port is formed on the surface of the end plate 200 distributed along the second direction, and the second connecting port is formed on the surface of the cooling plate 300 distributed along the second direction.

[0053] In this embodiment, one end of the connecting pipe 400 is connected to the first connecting port, and the other end is connected to the second connecting port. The first connecting port and the second connecting port are arranged opposite to each other in the second direction. This allows the connecting pipe 400 to extend along the second direction, that is, the connecting pipe 400 is a straight pipe without any bent or twisted parts. The straight connecting pipe 400 has a simple shape, making it easier to align and fix during installation, reducing the complexity and error rate during the installation process. At the same time, the straight connecting pipe 400 is also easier to disassemble and reinstall during maintenance and replacement, facilitating the inspection and maintenance of the cooling system.

[0054] Furthermore, since the straight connecting pipe 400 has no bends, there is no stress concentration inside the connecting pipe 400, resulting in a more stable structure. This effectively reduces the probability of leaks and other malfunctions, improving the reliability and safety of the cooling system.

[0055] It should be noted that, in this embodiment, when combined with the technical solutions described below, the first cooling channel 210 includes a first water inlet channel 211 and a first water return channel 212, and the second cooling channel 320 includes a second water inlet channel and a second water return channel, the number of the first connecting port and the number of the second connecting port are both two. That is, the first water inlet channel 211 and the first water return channel 212 respectively penetrate the surface of the end plate 200 along the second direction to form two first connecting ports, and one of the second water inlet channel and the second water return channel is connected to one of the second connecting ports, and the other is connected to the other second connecting port.

[0056] In one alternative embodiment, please refer to Figure 3 and Figure 5 A sealing structure 500 is provided between the connecting pipe 400 and the first cooling channel 210, as well as between the connecting pipe 400 and the second cooling channel 320. This can prevent the cooling medium from leaking between the connecting pipe 400 and the first cooling channel 210 or between the connecting pipe 400 and the second cooling channel 320, thus ensuring the stability of the cooling system operation.

[0057] In one alternative embodiment, please refer to Figure 5 The sealing structure 500 includes a sleeve 510 and a plurality of annular protrusions 520 distributed along the axial direction of the sleeve 510. The sleeve 510 is sleeved on the end of the connecting pipe 400, and the plurality of annular protrusions 520 are distributed on the outer circumferential surface of the sleeve 510.

[0058] In this embodiment, the sealing structure 500 includes a sleeve 510 and multiple annular protrusions 520. These annular protrusions 520 provide multiple lines of sealing protection; even if one seal fails, the others can still function, improving the reliability of the entire sealing system. Furthermore, the multiple annular protrusions 520 are located on the outer circumferential surface of the sleeve 510. The sleeve 510 can be directly fitted onto the end of the connecting pipe 400 to complete the installation of the sealing structure 500, requiring no complex tools or operations, making installation simple. Of course, the sealing structure 500 may also include sealing rings, etc. This application does not limit the specific structure of the sealing structure 500.

[0059] In one alternative embodiment, please continue to refer to Figure 5One end of the connecting pipe 400 is inserted into the first cooling channel 210, and the other end is inserted into the second cooling channel 320. The protrusion height of the plurality of annular protrusions 520 of each sealing structure 500 gradually decreases from the direction in which the connecting pipe 400 is inserted into the first cooling channel 210 or the second cooling channel 320. It should be noted that the protrusion height of the plurality of annular protrusions 520 of the sealing structure 500 located between the connecting pipe 400 and the first cooling channel 210 gradually decreases from the direction in which the connecting pipe 400 is inserted into the first cooling channel 210, and the protrusion height of the plurality of annular protrusions 520 of the sealing structure 500 located between the connecting pipe 400 and the second cooling channel 320 gradually decreases from the direction in which the connecting pipe 400 is inserted into the second cooling channel 320.

[0060] In this embodiment, the multiple annular protrusions 520 of each sealing structure 500 can all seal with the first cooling channel 210. The protrusion height of the annular protrusions 520 gradually decreases from the direction in which the connecting pipe 400 is inserted into the first cooling channel 210 or the second cooling channel 320. This can create a gradually increasing sealing pressure between the connecting pipe 400 and the first cooling channel 210 or the second cooling channel 320, so as to better prevent the leakage of the cooling medium and improve the sealing performance. Furthermore, by adopting the gradual protrusion height design of the annular protrusions 520, when the connecting pipe 400 is inserted into the first cooling channel 210 or the second cooling channel 320, the annular protrusions 520 with smaller protrusion heights will enter the first cooling channel 210 or the second cooling channel 320 first, and the annular protrusions 520 with larger protrusion heights will enter the first cooling channel 210 or the second cooling channel 320 later. In this way, during the assembly process of the connecting pipe 400, the connecting pipe 400 can enter the first cooling channel 210 or the second cooling channel 320 more smoothly, reducing the assembly difficulty. Of course, the height of each annular protrusion 520 can also be equal, and this application does not impose any restrictions on this.

[0061] In one alternative embodiment, please continue to refer to Figure 5 The height of the multiple annular protrusions 520 of each sealing structure 500 gradually increases from both ends of the sleeve 510 toward the middle of the sleeve 510.

[0062] In this embodiment, the height of the multiple annular protrusions 520 of each sealing structure 500 gradually increases from both ends of the sleeve 510 toward the middle. When the connecting pipe 400 is inserted into the first cooling channel 210 or the second cooling channel 320, the annular protrusions 520 with smaller protrusion height will enter the first cooling channel 210 or the second cooling channel 320 first, so as to reduce the assembly difficulty. And when the connecting pipe 400 is pulled out of the first cooling channel 210 or the second cooling channel 320, the annular protrusions 520 with smaller protrusion height will exit the first cooling channel 210 or the second cooling channel 320 first. In this way, the connecting pipe 400 can be more smoothly withdrawn from the first cooling channel 210 or the second cooling channel 320 during the disassembly process, reducing the disassembly difficulty.

[0063] In one alternative embodiment, please refer to Figure 3 and Figure 4 The first cooling channel 210 extends through the surface of the end plate 200 in the second direction to form a first connecting port. The cooling plate 300 has a second connecting port on the surface of the first connecting port. That is, the first connecting port and the second connecting port are arranged opposite to each other in the second direction. The second cooling channel 320 extends in the first direction to connect to the second connecting port. The first connecting port and the second connecting port are connected by a connecting pipe 400.

[0064] The first end of the connecting pipe 400 is inserted into the first cooling channel 210. A first stepped surface 220 is formed at the end of the first cooling channel 210 near the first connecting opening. The first stepped surface 220 is used to limit the insertion depth of the connecting pipe into the first cooling channel. In this embodiment, during the insertion of the connecting pipe 400 into the first cooling channel 210, the first stepped surface 220 can stop the connecting pipe 400. This stop and limiting design provides clear positioning for the installation of the connecting pipe 400, making installation more convenient. Furthermore, the stop and limiting design can effectively prevent the connecting pipe 400 from axially moving relative to the first cooling channel 210, ensuring a more stable and reliable connection between the connecting pipe 400 and the end plate 200.

[0065] And / or, the second end of the connecting pipe 400 is inserted into the second cooling channel 320. A second stepped surface 310 is formed at the end of the second cooling channel 320 near the second connecting opening. The second stepped surface 310 is used to limit the insertion depth of the connecting pipe into the second cooling channel. In this embodiment, during the insertion of the connecting pipe 400 into the second cooling channel 320, the second stepped surface can stop the connecting pipe 400. This stop and limiting design provides clear positioning for the installation of the connecting pipe 400, making installation more convenient. Furthermore, the stop and limiting design can effectively prevent the connecting pipe 400 from axially moving relative to the second cooling channel 320, ensuring a more stable and reliable connection between the connecting pipe 400 and the cooling plate 300.

[0066] In one alternative embodiment, please refer to Figure 3 The first connecting port and the second connecting port are arranged opposite each other in the second direction, and the distance between the first step surface 220 and the second step surface 310 is greater than the length of the connecting pipe 400.

[0067] In this embodiment, the distance between the first step surface 220 and the second step surface 310 is greater than the length of the connecting pipe 400. Thus, after the connecting pipe 400 is installed into the first cooling channel 210 and the second cooling channel 320, at least one of the end face of the first end of the connecting pipe 400 and the first step surface 220 and the end face of the second end of the connecting pipe 400 and the second step surface 310 has a gap. The gap can absorb the axial displacement of the connecting pipe 400 and avoid the hard stop between the connecting pipe 400 and the first step surface 220 and / or the second step surface 310, thereby reducing the risk of damage to the connecting pipe 400.

[0068] In one alternative embodiment, please refer to Figure 1 There are multiple battery cell groups 100, and each battery cell group 100 has an end plate 200 on one side along the first direction. It should be noted that each end plate 200 may include a front end plate and a rear end plate, which are located on both sides of the corresponding battery cell group 100 along the first direction.

[0069] The first cooling channel 210 in each end plate 200 and the second cooling channel 320 in the two cooling plates 300 adjacent to the end plate 200 are all connected by a connecting pipe 400.

[0070] In this embodiment, each cell pack 100 has an independent end plate 200 on one side. If one of the end plates 200 is damaged, the end plate 200 can be replaced individually, instead of replacing the whole end plate 200 as in the case of an integrated end plate 200. This can reduce the maintenance cost of the battery module.

[0071] For example, at least three cooling plates 300 include a first cooling plate 301, a second cooling plate 302, and a third cooling plate 303 spaced apart along a second direction. A receiving space is formed between the first cooling plate 301 and the second cooling plate 302, and a receiving space is formed between the second cooling plate 302 and the third cooling plate 303. Each end plate 200 includes a first end plate 201 and a second end plate 202. The first end plate 201 is correspondingly disposed with the battery module between the first cooling plate 301 and the second cooling plate 302, and the second end plate 202 is correspondingly disposed with the battery module between the second cooling plate 302 and the third cooling plate 303.

[0072] In one alternative embodiment, please refer to Figure 1 and Figure 2The battery module includes a water inlet connector 600 and a water outlet connector 700, which are respectively located on the fluid ports of two different end plates 200. That is, the water inlet connector 600 is located on the fluid port of one of the multiple end plates 200, and the water outlet connector 700 is located on the fluid port of another of the multiple end plates 200. For example, the water inlet connector 600 can be located on the fluid port of the second end plate 202, and the water outlet connector 700 can be located on the fluid port of the first end plate 201.

[0073] When installing the inlet and return water pipes, the inlet water pipe needs to be connected to the inlet connector 600, and the return water pipe needs to be connected to the outlet connector 700. That is, the inlet and return water pipes have specific installation positions. Therefore, in this embodiment, the inlet connector 600 and the outlet connector 700 are respectively located on two different end plates 200. This can remind the installers to assemble the inlet and return water pipes in sequence to achieve the purpose of preventing mistakes.

[0074] In some embodiments, please refer to Figure 2 The first cooling channel 210 includes a first water inlet channel 211 and a first water return channel 212, and the second cooling channel 320 includes a second water inlet channel and a second water return channel. The first water inlet channel 211, the second water inlet channel, the second water return channel, and the first water return channel 212 are connected in sequence. The first water inlet channel 211 is connected to the water inlet connector 600. This allows for the circulation of the cooling medium and improves heat exchange efficiency. A detailed flow diagram of the cooling medium can be found in [reference needed]. Figure 6 .

[0075] In one alternative embodiment, please refer to Figure 1 and Figure 2 The inlet connector 600 and the outlet connector 700 are offset in the second direction.

[0076] When installing the inlet and return water pipes, the inlet water pipe needs to be connected to the inlet connector 600, and the return water pipe needs to be connected to the outlet connector 700. That is, the inlet and return water pipes have specific installation positions. Therefore, in this embodiment, the inlet connector 600 and the outlet connector 700 are staggered. This can remind the installers to assemble the inlet and return water pipes in sequence to achieve the purpose of preventing mistakes.

[0077] In one alternative embodiment, the battery module further includes an insulating pad disposed between the end plate 200 and the cell assembly 100. Exemplarily, the insulating pad may be made of materials such as plastic or PVC.

[0078] In this embodiment, the insulating pad placed between the end plate 200 and the cell assembly 100 can increase the creepage distance between the terminals of the end plate 200 and the cell 110, providing better insulation protection; and the insulating pad can block heat transfer between the end plate 200 and the cell 110, preventing the temperature of the cell 110 closest to the end plate 200 from dropping too low, causing an excessive temperature difference between the cells 110, thereby improving the service life of the battery module.

[0079] This application also discloses a battery pack, including the battery module described in any of the above embodiments, so that the battery pack has the beneficial effects of the aforementioned battery module, which will not be repeated here.

[0080] The foregoing embodiments of this application focus on describing the differences between various embodiments. As long as the different optimization features between embodiments are not contradictory, they can be combined to form better embodiments. For the sake of brevity, these differences will not be elaborated upon here. The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of this application, can make many modifications without departing from the spirit and scope of the claims, all of which fall within the protection scope of this application.

Claims

1. A battery module, characterized by, include: A battery cell assembly (100) comprising a plurality of battery cells (110) stacked side by side along a first direction; An end plate (200) is provided on one side of the battery cell assembly (100) along the first direction. A first cooling channel (210) is provided in the end plate (200). A fluid port connected to the first cooling channel (210) is provided on the end plate (200). Cooling medium flows into or out of the end plate (200) through the fluid port. A cooling plate (300) is provided on both sides of the battery cell assembly (100) along a second direction. The cooling plate (300) is provided with a second cooling channel (320). The second direction is perpendicular to the first direction. A connecting pipe (400) is provided, one end of which is detachably connected to the first cooling channel (210) and the other end of which is detachably connected to the second cooling channel (320) so that the first cooling channel (210) and the second cooling channel (320) are connected.

2. The battery module of claim 1, wherein, The first cooling channel (210) extends through the surface of the end plate (200) in a second direction to form a first communication port. The cooling plate (300) has a second communication port formed on the surface of the first communication port. The second cooling channel (320) extends in a first direction to connect to the second communication port. The first communication port and the second communication port are connected by the connecting pipe (400).

3. The battery module of claim 1, wherein, A sealing structure (500) is provided between the connecting pipe (400) and the first cooling channel (210) and between the connecting pipe (400) and the second cooling channel (320).

4. The battery module of claim 3, wherein, The sealing structure (500) includes a sleeve (510) and a plurality of annular protrusions (520) distributed along the axial direction of the sleeve (510). The sleeve (510) is fitted onto the end of the connecting pipe (400), and the plurality of annular protrusions (520) are distributed on the outer circumferential surface of the sleeve (510).

5. The battery module of claim 4, wherein, One end of the connecting pipe (400) is inserted into the first cooling channel (210), and the other end is inserted into the second cooling channel (320); The height of the plurality of annular protrusions (520) of each of the sealing structures (500) gradually decreases from the direction in which the connecting pipe (400) is inserted into the first cooling channel (210) or the second cooling channel (320).

6. The battery module of claim 5, wherein, The protrusion height of the plurality of annular protrusions (520) of each of the sealing structures (500) gradually increases from both ends of the sleeve (510) toward the middle of the sleeve (510).

7. The battery module of claim 1, wherein, The first cooling channel (210) extends through the surface of the end plate (200) in the second direction to form a first communication port. The cooling plate (300) has a second communication port formed on the surface of the first communication port. The second cooling channel (320) extends in the first direction to connect to the second communication port. The first communication port and the second communication port are connected by the connecting pipe (400). The first end of the connecting pipe (400) is inserted into the first cooling channel (210), and a first stepped surface (220) is formed at the end of the first cooling channel (210) near the first communication port. The first stepped surface (220) is used to limit the insertion depth of the connecting pipe into the first cooling channel; and / or, the second end of the connecting pipe (400) is inserted into the second cooling channel (320), and a second stepped surface (310) is formed at the end of the second cooling channel (320) near the second communication port. The second stepped surface (310) is used to limit the insertion depth of the connecting pipe into the second cooling channel.

8. The battery module of claim 7, wherein, The first connecting port and the second connecting port are arranged opposite each other in the second direction, and the distance between the first step surface (220) and the second step surface (310) is greater than the length of the connecting pipe (400).

9. The battery module of claim 1, wherein, The number of battery cell groups (100) is multiple, and each battery cell group (100) is provided with an end plate (200) on one side along the first direction; the first cooling channel (210) in each end plate (200) and the second cooling channel (320) in the two cooling plates (300) adjacent to the end plate (200) are connected by the connecting pipe (400).

10. The battery module of claim 9, wherein, The battery module includes a water inlet connector (600) and a water outlet connector (700), which are respectively located at the fluid ports of two different end plates (200).

11. The battery module of claim 10, wherein, The inlet connector (600) and the outlet connector (700) are offset in the second direction.

12. The battery module of claim 1, wherein, The battery module also includes an insulating pad, which is disposed between the end plate (200) and the cell assembly (100).

13. A battery pack, characterized by Includes the battery module as described in any one of claims 1 to 12.

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