Battery module and energy storage device

Abstract

Provided are a battery module and an energy storage device. The battery module comprises: at least two battery cells (10), wherein the battery cells (10) are provided with top covers (11); at least one busbar (20), the busbar (20) being arranged above the top cover (11), and the busbar (20) being electrically connected to the poles (12) provided on the two adjacent top covers (11); and a liquid cooling pipe (30), wherein the liquid cooling pipe (30) is arranged on all the top covers (11) and is in heat transfer fit with all the busbars (20). Therefore, the high-temperature heat of the busbar (20) can be quickly absorbed and taken away by a cooling medium, thereby achieving the effect of cooling the busbar (20) by the liquid cooling pipe (30), and improving the overcurrent capability of the busbar (20); the problem of excessively high heat of the busbar (20) in a high overcurrent scene is well solved, and excessive installation space is not occupied, so that the problems of high processing costs and high difficulty are avoided.

Description

Battery modules and energy storage devices

[0001] This disclosure claims priority to Chinese patent application number 202310718976.1, filed on June 16, 2023, entitled “Battery Module and Energy Storage Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to a battery module and an energy storage device. Background Art

[0003] Currently, to meet the demands of high current and long battery life, secondary batteries are increasingly being packaged in the form of battery modules. These modules typically consist of several battery cells connected in series, with adjacent cells electrically connected via a busbar to channel the current from these cells into one output. However, the busbar carries a certain amount of current, which can lead to heating issues.

[0004] At present, the busbar generally adopts natural cooling to dissipate heat. However, with the continuous improvement of battery fast charging rate and the continuous increase of battery capacity, the charging current will inevitably increase. This also directly leads to the exponential growth of the heat generated by the busbar. Therefore, the existing natural cooling method can no longer meet the heat dissipation needs of the busbar. To this end, the relevant technology attempts to increase the width and thickness of the busbar or replace the material with a higher overcurrent coefficient to improve the overcurrent capacity of the busbar and reduce the heat generation. However, increasing the width and thickness of the busbar will cause the installation space occupied by the busbar to increase, and when the current increases to a certain value, the width and thickness of the busbar cannot continue to increase, so there is still a problem of not being able to meet the overcurrent capacity; and using materials with higher overcurrent capacity to manufacture the busbar will lead to a significant increase in processing costs and difficulty.

[0005] Summary of the Invention

[0006] The purpose of the present disclosure is to provide a battery module and an energy storage device to solve the problems of high processing cost and difficulty.

[0007] According to one aspect of the present disclosure, there is provided a battery module, comprising:

[0008] at least two battery cells, each having a top cover;

[0009] at least one busbar, the busbar being disposed above the top cover and electrically connected to poles disposed on two adjacent top covers; and

[0010] A liquid cooling pipe is provided above all the top covers and cooperates with all the bus bars for heat transfer.

[0011] In the battery module of the above scheme, by adding a liquid cooling tube between the top cover of the battery cell and the bus, when the high-rate, large-capacity battery module is charged and discharged at a large current, the current flowing through the bus increases, resulting in a significant increase in the heat generation of the bus. The liquid cooling tube is connected to an external cooling medium supply device, and the cooling medium supply device inputs cooling medium into the liquid cooling tube, and then the cooling medium can achieve heat exchange with the bus through the tube wall of the liquid cooling tube. In this way, the high-temperature heat of the bus can be quickly absorbed and carried away by the cooling medium, achieving the effect of cooling the bus by the liquid cooling tube, and effectively solving the problem of excessive heat generation of the bus in a higher overcurrent scenario, and improving the overcurrent capacity of the bus. Moreover, this scheme not only does not require increasing the width and thickness of the bus, but also does not occupy too much installation space, and will not limit the overcurrent capacity of the bus due to size. At the same time, it also does not require the bus to use materials with better overcurrent capacity, avoiding the problems of high processing cost and difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

[0013] FIG1 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure.

[0014] FIG2 is a partially enlarged structural diagram of point A in FIG1 .

[0015] FIG3 is a side structural diagram of the battery module in FIG1 .

[0016] FIG4 is a cross-sectional structural diagram taken along line BB in FIG3 .

[0017] FIG5 is a partial enlarged structural diagram of point C in FIG4 .

[0018] FIG6 is a top view of the battery module in FIG1 .

[0019] FIG7 is a cross-sectional structural diagram taken along line DD in FIG6 .

[0020] FIG8 is a partial enlarged structural diagram of point E in FIG7 .

[0021] FIG9 is a partial enlarged structural diagram of point F in FIG6 .

[0022] FIG10 is a schematic structural diagram of the first end plate.

[0023] FIG11 is a partially enlarged structural diagram of point G in FIG10 .

[0024] FIG12 is a top view of the first end plate in FIG10 .

[0025] FIG13 is a partially enlarged structural diagram of point H in FIG12 .

[0026] FIG14 is a schematic structural diagram of a liquid cooling tube according to an embodiment of the present disclosure.

[0027] Description of reference numerals: 100, battery module; 10, battery cell; 11, top cover; 12, terminal; 20, bus bar; 30, liquid cooling tube; 31. Liquid-cooling tube body; 311. First liquid-cooling tube section; 311a. First bending section; 311b. First end; 311c. Second end; 312. Second liquid-cooling tube section; 312a. Second bending section; 312b. First end; 312c. Second end; 313. Connecting tube section; 313a. First end; 313b. Second end; 32. Thermal insulation layer; 33. Liquid inlet joint; 34. Liquid inlet manifold; 35. Liquid outlet joint; 36. Liquid outlet manifold; 40. Box body; 41. First end plate; 411. First side surface; 412. Second side surface; 42. Second end plate; 43. First side plate; 44. Second side plate; 45. Position limiting mounting portion; 451. First position limiting portion; 452. Second position limiting portion; 453. Expanding portion; 50. Lead-out electrode base; 60. Lead-out electrode. DETAILED DESCRIPTION

[0028] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustrations to another component, these terms are used in this specification only for convenience, such as the orientation of the examples depicted in the accompanying drawings. It will be understood that if the illustrated device is flipped so that it is upside down, the component described as being "upper" will become the component "lower". Other relative terms such as "top" and "bottom" are also used to have similar meanings. When a structure is "on" another structure, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0029] The terms "a", "an", "the" and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second", etc. are used only as labels and do not limit the quantity of their objects.

[0030] Referring to Figures 1, 3, 4, and 6, a battery module 100 according to one embodiment of the present disclosure is shown. The battery module 100 includes at least two battery cells 10, at least one busbar 20, and a liquid cooling tube 30. Specifically, Figure 1 shows a battery module 100 containing twelve battery cells 10. The battery cells 10 are prismatic cells, and the twelve battery cells 10 are arranged side by side in the same direction, with their large surfaces (side surfaces) mating (e.g., touching or maintaining a predetermined gap).

[0031] Of course, in other embodiments, the battery cell 10 may also be a cylindrical battery, etc.

[0032] In addition, Figure 1 also shows that there are twelve busbars 20. Six of the busbars 20 are arranged in a row at one end of the battery module 100 in the longitudinal direction, with each busbar 20 electrically connected to the positive electrode posts 12 of two adjacent battery cells 10. The remaining six busbars 20 are arranged in a row at the other end of the battery module 100 in the longitudinal direction, with each busbar 20 electrically connected to the negative electrode posts of two adjacent battery cells 10.

[0033] Optionally, the busbar 20 may be electrically connected to the positive electrode column and the negative electrode column by welding or other methods.

[0034] Continuing to refer to FIG. 7 and FIG. 8 , the battery cell 10 has a top cover 11 ; a bus bar 20 is disposed on one side of the top cover 11 along the height direction of the battery module 100 , i.e., the bus bar 20 is located above the top cover 11 , and the bus bar 20 is electrically connected to the poles 12 disposed on two adjacent top covers 11 ; a liquid cooling pipe 30 is disposed on all the top covers 11 and cooperates with all the bus bars 20 for heat transfer.

[0035] In summary, the implementation of the technical solution of this embodiment will have the following beneficial effects: in the battery module 100 of the above solution, by adding a liquid cooling tube 30 between the top cover 11 of the battery cell 10 and the bus 20, when the high-rate, large-capacity battery module 100 is charged and discharged at a large current, the current flowing through the bus 20 increases, resulting in a significant increase in the heat generated by the bus 20. The liquid cooling tube 30 is connected to an external cooling medium supply device, and the cooling medium supply device will input cooling medium into the liquid cooling tube 30, and then the cooling medium can be connected to the bus through the tube wall of the liquid cooling tube 30. 20 heat exchange, in this way, the high-temperature heat of the bus 20 can be quickly absorbed and taken away by the cooling medium, achieving the effect of cooling the bus 20 by the liquid cooling tube 30, and well solving the problem of excessive heat generation of the bus 20 in a high flow scenario, thereby improving the flow capacity of the bus 20. Moreover, this solution not only does not need to increase the width and thickness of the bus 20, but also does not occupy too much installation space, and does not limit the flow capacity of the bus 20 due to its size, but also does not require the bus 20 to use materials with better flow capacity, thus avoiding the problems of high processing cost and difficulty.

[0036] In actual work, in the high overcurrent scenario of large-rate, large-capacity batteries, the liquid cooling tube 30 can actually dissipate heat and cool down hot spots such as the bus 20, the welding parts between the poles 12 and the bus 20, the welding parts between the poles 12 and the tabs inside the battery, and the welding parts between the tabs inside the battery and the winding core.

[0037] Continuing to refer to Figures 1, 2, 5, and 14, in some embodiments, the liquid cooling tube 30 includes a liquid cooling tube body 31 and a thermally conductive insulating layer 32. The thermally conductive insulating layer 32 is mounted on the exterior of the liquid cooling tube body 31 and abuts against the busbar 20. A flow channel is formed within the liquid cooling tube body 31, through which the cooling medium can flow, thereby enabling heat transfer between the tube wall of the liquid cooling tube body 31 and the busbar 20, thereby cooling and dissipating heat from the busbar 20.

[0038] According to actual needs, the cooling medium can be but not limited to water, oil, etc., or a mixture of two or more.

[0039] The heat-conducting insulating layer 32 installed on the outside of the liquid-cooling tube body 31 is made of a compressible material with high thermal conductivity and good insulation effect. For example, heat-conducting silicone is used in this embodiment. In addition to completing the rapid heat conduction from the bus 20 to the liquid-cooling tube body 31, it can also ensure insulation protection between the bus 20 and the liquid-cooling tube body 31.

[0040] During actual manufacturing, under the pressure of the tooling, busbar 20 forms surface contact with the positive and negative electrode posts, and then the electrical connection is completed through laser welding. Simultaneously, the heat-conducting insulating layer 32 is subjected to pressure from busbar 20, allowing the liquid cooling tube 30 to form thermally conductive contact with the busbar 20. This connection method is quick and simple, which helps improve production efficiency.

[0041] In the present disclosure, the heat dissipation of the bus 20 is assisted by the liquid cooling tube 30. The core lies in the design of the heat exchange contact area between the liquid cooling tube 30 and the bus 20. In some embodiments, the width of the liquid cooling tube body 31 is in the range of 15mm to 48mm. If the width of the liquid cooling tube body 31 is too small, the heat exchange contact area with the bus 20 is too small, which will affect the cooling and heat dissipation efficiency of the liquid cooling tube 30 on the bus 20; and if the width of the liquid cooling tube body 31 is too large, part of the width of the liquid cooling tube body 31 will not be able to contact the bus 20, that is, it will not be able to participate in the heat transfer work at all, resulting in the liquid cooling tube body 31 having excess width, excessive weight, and increased consumables leading to increased costs. By controlling the width range of the liquid cooling tube body 31 within the range of 15mm to 48mm, the above problems can be avoided, while meeting the use requirements of buses 20 of different specifications and sizes.

[0042] Furthermore, the liquid cooling tube body 31 is a flat tube having a first wide surface and a second wide surface facing each other. The first wide surface abuts the top cover 11, and the second wide surface abuts the busbar 20. After installation, this helps reduce the overall height of the battery module 100, minimizing installation space and facilitating a miniaturized design of the battery module 100.

[0043] Optionally, the cross-section of the flat tube may be any one of rectangular, elliptical, etc.

[0044] Continuing with Figures 1 and 14 , in some embodiments, the liquid-cooling pipe body 31 includes a first liquid-cooling pipe segment 311, a second liquid-cooling pipe segment 312, and a connecting pipe segment 313. The first end 313a of the connecting pipe segment 313 is in communication with the first end 311b of the first liquid-cooling pipe segment 311, and the second end 313b of the connecting pipe segment 313 is in communication with the first end 312b of the second liquid-cooling pipe segment 312. For example, in this embodiment, the first liquid-cooling pipe segment 311, the connecting pipe segment 313, and the second liquid-cooling pipe segment 312 cooperate to form a U-shaped or C-shaped structure.

[0045] The first liquid cooling pipe section 311 is arranged close to the pole 12 at one end of the battery cell 10 , the second liquid cooling pipe section 312 is arranged close to the pole 12 at the other end of the battery cell 10 , and the connecting pipe section 313 is arranged close to the edge of the battery module 100 .

[0046] The U- or C-shaped design of the liquid cooling tube body 31 not only prevents the first liquid cooling tube section 311, the second liquid cooling tube section 312, and the connecting tube section 313 from obstructing components such as the explosion-proof valve in the middle of the battery cell 10, but also shortens the length of the liquid cooling tube body 31, reducing consumables and manufacturing costs. Furthermore, the first and second liquid cooling tube sections 311, 312 are positioned closer to the poles 12 at the longitudinal ends of the battery cell 10, making it easier to establish reliable heat transfer contact with the busbar 20, thereby reducing the size of the busbar 20.

[0047] It can be understood that when multiple battery cells 10 are arranged side by side, the row of multiple poles 12 corresponding to the first liquid cooling pipe section 311 and the row of multiple poles 12 corresponding to the second liquid cooling pipe section 312 both adopt an alternating positive and negative arrangement method to achieve series connection of each battery cell 10.

[0048] Continuing to refer to Figures 1 to 5 and 14, based on the above embodiment, the liquid cooling pipe 30 further includes a liquid inlet connector 33, a liquid inlet manifold 34, a liquid outlet connector 35, and a liquid outlet manifold 36. The second end 311c of the first liquid cooling pipe section 311 is connected to the liquid inlet manifold 34, and the liquid inlet connector 33 is connected to the liquid inlet manifold 34. The second end 312c of the second liquid cooling pipe section 312 is connected to the liquid outlet manifold 36, and the liquid outlet manifold 36 is connected to the liquid outlet connector 35. In this manner, the cooling medium can be easily connected from the liquid inlet connector 33 and then flow into the liquid cooling pipe body 31 through the liquid inlet manifold 34. After the cooling medium completes heat transfer with the bus 20, it further flows through the liquid outlet manifold 36 to the liquid outlet connector 35, and is finally discharged from the liquid outlet connector 35 and returned to the cooling medium supply device, thus realizing the recycling of the cooling medium.

[0049] Please continue to refer to Figures 1, 3, 6 and 10. In addition, in some other embodiments, the battery module 100 also includes a box body 40, which includes a first end plate 41, a second end plate 42, a first side plate 43 and a second side plate 44. The first end plate 41, the first side plate 43, the second end plate 42 and the second side plate 44 are connected end to end and form an installation cavity, and all battery cells 10 are installed in the installation cavity. Furthermore, the box body 40 can also include a bottom plate (not shown in the figure), which serves as a loading support for the first end plate 41, the second end plate 42, the first side plate 43 and the second side plate 44, so that the first end plate 41, the second end plate 42, the first side plate 43 and the second side plate 44 can be erected on the bottom plate and connected end to end. When all battery cells 10 are inserted into the installation cavity, they will be pre-tightened by the first end plate 41, the second end plate 42, the first side plate 43 and the second side plate 44 to form a stable installation, ensuring that the battery cells 10 are not easily loosened and fallen.

[0050] After installation, the positive and negative poles of the battery cell 10 , the top cover 11 , and the busbar 20 are all located at the upper open side of the box body 40 , facilitating connection operations.

[0051] Optionally, the first end plate 41 , the second end plate 42 , the first side plate 43 and the second side plate 44 may be assembled and fixed by welding, screw connection, snap connection or any other method, and a flexible selection may be made according to actual needs.

[0052] Please continue to refer to Figures 2, 3, 5, 9 to 13. Furthermore, the first end plate 41 or the second end plate 42 is recessed to form two limiting mounting portions 45, and the second end 311c of the first liquid-cooling pipe section 311 is formed with a first bent section 311a bent toward a corresponding limiting mounting portion 45, and the liquid inlet collecting pipe 34 is installed at an extension portion of the first bent section 311a toward a corresponding limiting mounting portion 45 and is limitedly matched with the limiting mounting portion 45; the second end 312c of the second liquid-cooling pipe section 312 is formed with a second bent section 312a bent toward another corresponding limiting mounting portion 45, and the liquid outlet collecting pipe 36 is installed at an extension portion of the second bent section 312a toward a corresponding limiting mounting portion 45 and is limitedly matched with the limiting mounting portion 45. Therefore, after installation, the limiting installation portion 45 can effectively constrain the freedom of the liquid inlet manifold 34 and the liquid outlet manifold 36, thereby achieving the effect of limiting the loosening or even falling of the liquid cooling tube 30, and improving the installation reliability of the liquid cooling tube 30.

[0053] Specifically, as shown in Figures 9 and 11-13, in some embodiments, the limiting mounting portion 45 includes a first limiting portion 451, which is adapted to fit the contours of a portion of the outer tube walls of the liquid inlet manifold 34 and the liquid outlet manifold 36.

[0054] For example, taking the installation structure of the first end plate 41, the liquid inlet manifold 34 and the liquid inlet connector 33 as an example, the upper end surface of the first end plate 41 is concave inward to form a groove, and at least one side wall of the groove is provided with a first limiting portion 451. After the liquid inlet manifold 34 and the liquid inlet connector 33 are inserted into the groove from top to bottom, the left and right side walls of the liquid inlet manifold 34 are exactly engaged with the two first limiting portions 451, so that the horizontal movement freedom of the liquid inlet manifold 34 and the liquid inlet connector 33 is constrained, so that when the opponent (i.e., the plug of the coolant supply device) is horizontally plugged into the liquid inlet connector 33, the liquid cooling tube 30 can be fixed in place, thereby avoiding damage to the liquid inlet connector 33 and preventing deformation of the liquid cooling tube 30.

[0055] For example, in this embodiment, the first limiting portion 451 is designed as a semicircular groove, and the liquid inlet manifold 34 adopts a flat tube with an elliptical cross-section. The arc-shaped small surface of the liquid inlet manifold 34 can just fit into the semicircular groove, thereby effectively limiting the front and back and left and right movement freedom of the liquid inlet manifold 34.

[0056] Furthermore, the position-limiting mounting portion 45 also includes a second position-limiting portion 452, which abuts against the end walls of the liquid inlet manifold 34 and the liquid outlet manifold 36. For example, the second position-limiting portion 452 is a stepped structure formed on at least one side of the groove wall. When the liquid inlet manifold 34 is installed in the groove, its lower end wall coincides with the stepped structure. This stepped structure then imposes a position limit on the liquid inlet manifold 34 in the -Z-axis direction (the Z-axis direction is the height direction of the battery module 100). Simultaneously, the busbar 20, after being installed and secured, is crimped against the upper surface of the liquid cooling tube 30, simultaneously imposing a position limit on the liquid cooling tube 30 in the +Z-axis direction. This completely restricts the degree of freedom of the liquid cooling tube 30 in the Z-axis direction, ensuring a secure installation of the liquid cooling tube 30 and preventing deformation of the liquid cooling tube 30 due to battery expansion or subsequent stress during maintenance.

[0057] Furthermore, the position-limiting mounting portion 45 also includes a flared portion 453. The first end plate 41 or the second end plate 42 has a first side surface 411 and a second side surface 412 that oppose each other in the thickness direction. The width of the flared portion 453 gradually increases from the first side surface 411 to the second side surface 412. The liquid inlet connector 33 and the liquid outlet connector 35 extend from the corresponding flared portion 453. During actual installation, if the counterpart (i.e., the plug of the coolant supply device) is compact, the flared portion 453 can appropriately increase the space for movement and operation when inserting the counterpart, thereby facilitating installation.

[0058] In other embodiments, the battery module 100 further includes at least two lead-out bases 50 and at least two lead-out electrodes 60 (as shown in FIG1 ). The lead-out bases 50 are mounted on the housing 40, and the lead-out electrodes 60 are mounted one-to-one on the lead-out bases 50. The lead-out electrodes 60 are electrically connected to all the busbars 20. The busbars 20 of a single battery module 100 are electrically connected to the lead-out electrodes 60 to achieve current convergence. On this basis, the lead-out electrodes 60 can also achieve electrical connection between different battery modules 100.

[0059] In addition to the above, the present disclosure further provides an energy storage device, which includes the battery module 100 as described in any of the above embodiments.

[0060] It should be understood that the present disclosure is not limited in its application to the detailed structure and arrangement of the components set forth in this specification. The present disclosure is capable of other embodiments and can be implemented and carried out in a variety of ways. The aforementioned variations and modifications fall within the scope of the present disclosure. It should be understood that the present disclosure disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or evident in the text and / or the drawings. All of these different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best known ways to implement the present disclosure and will enable those skilled in the art to utilize the present disclosure.

Claims

1. A battery module, characterized in that: include: at least two battery cells, each having a top cover; at least one bus bar, the bus bar being arranged above the top cover and the bus bar being electrically connected to poles arranged on two adjacent top covers; and A liquid cooling pipe is arranged above all the top covers and cooperates with all the bus bars for heat transfer.

2. The battery module according to claim 1, characterized in that: The liquid cooling tube comprises a liquid cooling tube body and a heat conductive insulating layer. The heat conductive insulating layer is installed outside the liquid cooling tube body, and the heat conductive insulating layer is in contact with the bus bar.

3. The battery module according to claim 2, characterized in that: The width of the liquid cooling tube body ranges from 15 mm to 48 mm.

4. The battery module according to claim 2, characterized in that: The liquid cooling tube body is a flat tube having a first wide surface and a second wide surface opposite to each other. The first wide surface abuts against the top cover, and the second wide surface abuts against the bus bar.

5. The battery module according to claim 2, characterized in that: The liquid cooling pipe body includes a first liquid cooling pipe section, a second liquid cooling pipe section and a connecting pipe section, the first end of the connecting pipe section is connected to the first end of the first liquid cooling pipe section, the second end of the connecting pipe section is connected to the first end of the second liquid cooling pipe section, the first liquid cooling pipe section is arranged close to the pole at one end of the battery cell, the second liquid cooling pipe section is arranged close to the pole at the other end of the battery cell, and the connecting pipe section is arranged close to the edge of the battery module.

6. The battery module according to claim 5, characterized in that: The liquid cooling pipe also includes a liquid inlet joint, a liquid inlet collecting pipe, a liquid outlet joint and a liquid outlet collecting pipe. The second end of the first liquid cooling pipe section is connected to the liquid inlet collecting pipe, the liquid inlet joint is connected to the liquid inlet collecting pipe, the second end of the second liquid cooling pipe section is connected to the liquid outlet collecting pipe, and the liquid outlet collecting pipe is connected to the liquid outlet joint.

7. The battery module according to claim 6, characterized in that: The battery module further includes a box body, the box body includes a first end plate, a second end plate, a first side plate and a second side plate, the first end plate, the first side plate, the second end plate and the second side plate are connected end to end and surround an installation cavity, and all the battery cells are installed in the installation cavity; The first end plate or the second end plate is concavely formed with two limit installation parts, the second end of the first liquid cooling pipe section is formed with a first bending section bent toward a corresponding one of the limit installation parts, the liquid inlet manifold is installed at the extension part of the first bending section toward the corresponding one of the limit installation parts and is limitedly matched with the limit installation part; The second end of the second liquid cooling pipe section is formed with a second bent section bent toward another corresponding limiting mounting portion, and the liquid outlet collecting pipe is installed at an extension portion of the second bent section toward a corresponding limiting mounting portion and is limitedly matched with the limiting mounting portion.

8. The battery module according to claim 7, characterized in that: The position-limiting installation portion includes a first position-limiting portion, and the first position-limiting portion is adapted to fit with the contours of a portion of the outer tube walls of the liquid inlet header and the liquid outlet header.

9. The battery module according to claim 7, characterized in that: The position-limiting installation portion further includes a second position-limiting portion, and the second position-limiting portion abuts against the tube end walls of the liquid inlet manifold and the liquid outlet manifold.

10. The battery module according to claim 7, characterized in that: The position-limiting mounting portion further includes a flared portion, the first end plate or the second end plate has a first side surface and a second side surface opposite to each other in the thickness direction, and the width of the flared portion is gradually increased in the direction from the first side surface to the second side surface; The liquid inlet joint and the liquid outlet joint extend from the corresponding flared portions respectively.

11. An energy storage device, characterized in that: Comprising the battery module according to any one of claims 1 to 10.

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