Battery pack

Abstract

The present application provides a battery pack, comprising at least two layers of battery cell modules and a liquid cooling assembly. A liquid cooling assembly is arranged between every two adjacent layers of battery cell modules; the liquid cooling assembly comprises a first plate, a second plate and a third plate, the second plate being located between the first plate and the third plate, a first cooling flow channel being formed between the first plate and the second plate, a second cooling flow channel being formed between the second plate and the third plate, and the first cooling flow channel and the second cooling flow channel are communicated or not communicated.

Description

Battery pack

[0001] This application is requested to be filed with the Chinese Patent Office on May 9, 2024, application number 2024210025292.

[0002] The priority of the above Chinese patent applications is hereby granted, and the entire contents of the above applications are incorporated herein by reference. Technical Field

[0003] This application relates to the field of energy storage product technology, specifically to a battery pack. Background Technology

[0004] To increase the capacity of a battery pack, multiple cell modules are typically arranged within it. These modules can be layered to make efficient use of the internal space. For multi-layered cell modules, brackets are usually used to separate the modules, and a cold plate is placed at the bottom for each layer. However, this arrangement increases the thickness of the battery pack, resulting in low space utilization.

[0005] The related technology discloses an integrated battery assembly with a double-layer module, in which multiple cell modules are distributed in two layers, and a water-cooling plate assembly is set between the two layers of cell modules. The water-cooling plate assembly cools down the two layers of cell modules, which can reduce the thickness of the battery pack and improve the space utilization of the battery pack. Invention Overview

[0006] However, the above solution has the following drawbacks: one flow channel inside the water-cooled plate assembly cools both the upper and lower cell modules at the same time, resulting in poor cooling effect. After long-term operation, the cell modules may experience thermal runaway due to slow cooling speed, which will shorten the service life of the battery pack.

[0007] Therefore, there is an urgent need for a new battery pack to solve the aforementioned problems in the existing technology.

[0008] This application provides a battery pack, the battery pack comprising:

[0009] At least two layers of battery cell modules;

[0010] A liquid cooling assembly is provided between two adjacent layers of the battery cell module. The liquid cooling assembly includes a first plate, a second plate, and a third plate. The second plate is located between the first plate and the third plate. A first cooling channel is formed between the first plate and the second plate, and a second cooling channel is formed between the second plate and the third plate.

[0011] The first cooling channel and the second cooling channel may be connected or not connected. Beneficial effects

[0012] This application provides a battery pack comprising at least two layers of cell modules. A liquid cooling assembly is disposed between adjacent cell modules, which simultaneously dissipates heat and cools the adjacent cell modules, eliminating the need for supports between adjacent modules. This reduces the thickness dimension of the battery pack and improves space utilization. A first cooling channel is defined between the first and second plates of the liquid cooling assembly, and a second cooling channel is defined between the second and third plates. Coolant is circulated through the first and second cooling channels to specifically cool and dissipate heat from the adjacent cell modules. Compared to cooling two adjacent cell modules simultaneously through a single cooling channel, this method effectively improves the cooling effect of multi-layer cell modules, prevents thermal runaway and other hazards due to slow cooling, and extends the battery pack's lifespan. Attached Figure Description

[0013] Figure 1 is a first exploded view of the battery pack provided in a specific embodiment of this application.

[0014] Figure 2 is a second exploded view of the battery pack provided in a specific embodiment of this application.

[0015] Figure 3 is a cross-sectional view of the liquid cooling assembly provided in a specific embodiment of this application.

[0016] Figure 4 is a partial view of Figure 3.

[0017] Figure 5 is a first exploded view of the liquid cooling assembly provided in a specific embodiment of this application.

[0018] Figure 6 is a second exploded view of the liquid cooling assembly provided in a specific embodiment of this application.

[0019] Figure 7 is a first view of the second plate of the liquid cooling assembly provided in a specific embodiment of this application.

[0020] Figure 8 is a second view of the second plate of the liquid cooling assembly provided in a specific embodiment of this application.

[0021] Figure 9 is a first exploded view of the main housing and battery cell module provided in a specific embodiment of this application.

[0022] Figure 10 is a second exploded view of the main housing and battery cell module provided in a specific embodiment of this application.

[0023] Figure 11 is a magnified view of part A in Figure 2.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Battery cell module; 2. Liquid cooling assembly; 3. First thermally conductive structural adhesive; 4. Second thermally conductive structural adhesive; 5. Frame assembly; 6. Pressure strip; 7. First adhesive layer; 8. Second adhesive layer;

[0026] 11. Battery cell; 111. Casing; 112. Terminal;

[0027] 21. First plate; 22. Second plate; 23. Third plate; 24. First cooling channel; 25. Second cooling channel

[0028] But the flow channel;

[0029] 221. First flow channel groove; 222. Second flow channel groove; 223. First convex hull; 224. Second convex hull;

[0030] 51. Main shell; 52. Separating beam; 53. Cover;

[0031] 510. Module chamber;

[0032] 61. Material reduction chamber. Embodiments of the present invention

[0033] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, where the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, where the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for distinction in description and have no special meaning.

[0036] This embodiment provides a battery pack, as shown in Figures 1 and 2, which are exploded views of the battery pack. This battery pack reduces the thickness dimension, improving space utilization, while also enhancing the cooling effect of the multi-layer cell module 1. This prevents thermal runaway and other hazards caused by slow cooling of the cell module 1, thus extending the battery pack's lifespan.

[0037] The battery pack includes at least two layers of cell modules 1, such as two-layer, three-layer, four-layer, or more layers of cell modules 1. Each layer of cell modules 1 includes one or more cell modules 1. Specifically, in Figures 1 and 2, each layer of cell modules 1 includes four cell modules 1 distributed in a 2×2 matrix, and each cell module 1 includes multiple cells 11. In other embodiments, the distribution of each layer of cell modules 1 can be selected according to design requirements and is not limited to a 2×2 matrix distribution, such as a 2×3 or 3×3 matrix distribution.

[0038] A liquid cooling component 2 is provided between each pair of adjacent cell modules 1. This liquid cooling component 2 can simultaneously dissipate heat and cool the two adjacent cell modules 1, eliminating the need for a support bracket between adjacent modules, thus reducing the thickness dimension of the battery pack and improving the space utilization of the battery pack.

[0039] Referring to Figures 3, 4, and 5, the liquid cooling assembly 2 includes a first plate 21, a second plate 22, and a third plate 23 stacked sequentially. The second plate 22 is located between the first plate 21 and the third plate 23, and the first plate 21, the second plate 22, and the third plate 23 are connected as a single unit. A first cooling channel 24 is formed between the first plate 21 and the second plate 22, and a second cooling channel 25 is formed between the second plate 22 and the third plate 23. Coolant is continuously circulated within the first cooling channel 24 and the second cooling channel 25 to achieve cooling and temperature reduction.

[0040] In the liquid cooling assembly 2 between the two layers of battery cell modules 1, a first cooling channel 24 is defined between the first plate 21 and the second plate 22, and a second cooling channel 25 is defined between the second plate 22 and the third plate 23. The first cooling channel 24 and the second cooling channel 25 are respectively used to cool and dissipate heat for the two adjacent layers of battery cell modules 1. Compared with the method of cooling and dissipating heat for the two adjacent layers of battery cell modules 1 at the same time through a single cooling channel, the cooling and dissipation effect of the multi-layer battery cell module 1 can be effectively improved, so that the battery cells 11 in the battery cell module 1 can work in a suitable temperature environment, prevent the battery cell module 1 from thermal runaway and other dangers due to slow cooling, and extend the service life of the battery pack.

[0041] For example, the first plate 21 and the second plate 22, as well as the second plate 22 and the third plate 23, are welded together, which can improve the stability and sealing of the connection.

[0042] In some embodiments, the first cooling channel 24 and the second cooling channel 25 are connected, and the coolant inlet is fixedly disposed on the first plate 21 to directly communicate with the first cooling channel 24; alternatively, the coolant inlet is fixedly disposed on the third plate 23 to directly communicate with the second cooling channel 25. A connecting port is provided between the first cooling channel 24 and the second cooling channel 25, which is disposed on the second plate 22. The coolant input through this inlet can flow through the first cooling channel 24 and the second cooling channel 25, thereby achieving cooling for the two adjacent layers of battery cell modules 1 while saving on the number of components, reducing space occupation, and lowering costs.

[0043] In other embodiments, the first cooling channel 24 and the second cooling channel 25 may not be connected. In this case, an inlet for introducing coolant and an outlet for discharging coolant need to be provided separately on the first plate 21 and the third plate 23, respectively. The first cooling channel 24 and the second cooling channel 25 are independent of each other, and the internal coolants are not connected.

[0044] In some embodiments, the side of the first plate 21 facing away from the second plate 22 is a plane, which is configured to contact one layer of cell module 1; the side of the third plate 23 facing away from the second plate 22 is also a plane, which is configured to contact another layer of cell module 1. Setting the side of the liquid cooling assembly 2 that contacts the cell module 1 as a plane can improve the relative stability between the cell module 1 and the liquid cooling assembly 2 inside the battery pack, while also ensuring sufficient contact area between the liquid cooling assembly 2 and the cell module 1 to improve heat dissipation.

[0045] Specifically, in Figures 5 and 6 of this embodiment, both the first plate 21 and the third plate 23 are flat plates. Referring to Figures 7 and 8, the second plate 22 has a first flow channel 221 and a second flow channel 222 on its two sides, respectively. The inner wall of the first flow channel 221 and the first plate 21 form a first cooling channel 24, and the second flow channel 222 and the third plate 23 form a second cooling channel 25. Since both the first plate 21 and the third plate 23 are flat plates, both sides are planar, facilitating contact with the battery cell module 1. Furthermore, in this liquid cooling assembly 2, only one second plate 22 needs to have the first flow channel 221 and the second flow channel 222 respectively provided; the other two plates (the first plate 21 and the third plate 23) are both planar, thus defining the first cooling channel 24 and the second cooling channel 25, simplifying the processing steps and improving processing efficiency.

[0046] Referring to Figures 7 and 8, a first convex bulge 223 and a second convex bulge 224 are respectively provided on both sides of the second plate 22. The first convex bulge 223 and the second flow channel groove 222 are located on the same side of the second plate 22, and the second convex bulge 224 and the first flow channel groove 221 are also located on the same side of the second plate 22. The first flow channel groove 221 is formed on the side of the first convex bulge 223 facing away from the second flow channel groove 222, and the second flow channel groove 222 is formed on the side of the second convex bulge 224 facing away from the first flow channel groove 221. That is, while the first convex bulge 223 is formed on the second plate 22, a groove is formed on the back of the first convex bulge 223, which is the first flow channel groove 221. Similarly, while the second convex bulge 224 is formed on the second plate 22, a groove is formed on the back of the second convex bulge 224, which is the second flow channel groove 222. Specifically, in this embodiment, the second plate 22 is integrally stamped. The stamping die is adapted to the shape and size of the first flow channel 221 and the second flow channel 222. The first flow channel 221, the second flow channel 222, the first convex 223 and the second convex 224 can be formed by stamping in one step, which is simple.

[0047] It is understood that the first convex 223 and the first flow channel 221 have the same shape, and the second convex 224 and the second flow channel 222 have the same shape. When the second convex 224 is formed, the second flow channel 222 can be formed on its back side, and when the first convex 223 is formed, the first flow channel 221 can be formed on its back side.

[0048] In this embodiment, at least one of the first cooling channel 24 and the second cooling channel 25 is a serpentine channel, which can increase the flow time of the coolant in it, so that the coolant can fully contact the battery cell module 1 and improve the cooling effect.

[0049] Specifically, as shown in Figures 7 and 8, the first flow channel 221 extends in a serpentine shape, and correspondingly, the first convex hull 223 also extends in a serpentine shape. The second convex hull 224 surrounds the outside of the first flow channel 221, and the second flow channel 222 surrounds the outside of the first convex hull 223.

[0050] Referring to Figures 4, 5, and 6, the first convex 223 is in sealed contact with the third plate 23, and the second convex 224 is in sealed contact with the first plate 21, so that the coolant in the first cooling channel 24 and the second cooling channel 25 flows along a defined path.

[0051] In another optional embodiment, flow channels may be provided on the first plate 21 and the third plate 23. Specifically, the side of the first plate 21 facing the cell module 1 is flat, and a third flow channel groove is provided on the side of the first plate 21 facing the second plate 22. The inner wall of the third flow channel groove and the second plate 22 form a first cooling flow channel 24. The side of the third plate 23 facing the cell module 1 is flat, and a fourth flow channel groove is provided on the side of the third plate 23 facing the second plate 22. The inner wall of the fourth flow channel groove and the second plate 22 form a second cooling flow channel 25. In some embodiments, the second plate 22 may be a flat plate, and the two sides of the flat plate define the first cooling flow channel 24 and the second cooling flow channel 25 with the first plate 21 and the third plate 23, respectively. Alternatively, the second plate 22 can also be a flow channel plate, with a fifth flow channel groove and a sixth flow channel groove respectively provided on both sides. The inner wall of the third flow channel groove on the first plate 21 and the inner wall of the fifth flow channel groove on the second plate 22 together form the first cooling flow channel 24, and the fourth flow channel groove on the third plate 23 and the sixth flow channel groove on the second plate 22 together form the second cooling flow channel 25.

[0052] Referring to Figures 9 and 10, the battery cell 11 includes a housing 111 and terminals 112, with the terminals 112 disposed on the housing 111. In this embodiment, the battery cell module 1 has two layers, and the two layers of the battery cell module 1 are arranged mirror-symmetrically relative to the liquid cooling component 2. The terminals 112 are located on the side of the housing 111 facing away from the liquid cooling component 2. Therefore, the side of the housing 111 without the terminals 112 is in direct planar contact with the liquid cooling component 2, increasing the contact area, improving heat dissipation, and helping to maintain the temperature consistency of multiple battery cells 11.

[0053] For example, two battery cell modules 1 are arranged vertically, with the upper battery cell module 1 having the terminal 112 facing upwards and the lower battery cell module 1 having the terminal 112 facing downwards. This makes the outer shell 111 of the battery cell 11 in the upper battery cell module 1 in planar contact with the first plate 21, and the outer shell 111 of the battery cell 11 in the lower battery cell module 1 in planar contact with the third plate 23.

[0054] In some embodiments, a first thermally conductive structural adhesive 3 is provided between the first plate 21 and the upper battery cell module 1. Specifically, the first plate 21 is bonded and fixed to the outer shell 111 of the upper battery cell 11 using the first thermally conductive structural adhesive 3. A second thermally conductive structural adhesive 4 is provided between the second plate 22 and the battery cell module 1. Specifically, the third plate 23 is bonded to the outer shell 111 of the lower battery cell 11 using the second thermally conductive structural adhesive 4. On the one hand, the first thermally conductive structural adhesive 3 and the second thermally conductive structural adhesive 4 can quickly and firmly fix the liquid cooling component 2 to the upper and lower battery cell modules 1. On the other hand, the first thermally conductive structural adhesive 3 and the second thermally conductive structural adhesive 4 have good thermal conductivity, which can improve the heat exchange efficiency between the liquid cooling component 2 and the upper and lower battery cell modules 1, and improve the cooling effect.

[0055] Exemplarily, both the first heat-conducting structural adhesive 3 and the second heat-conducting structural adhesive 4 are two-component polyurethane heat-conducting structural adhesives, which have high strength, high bonding firmness, and excellent heat-conducting performance.

[0056] Referring to FIGS. 1, FIG. 2, FIG. 9 and FIG. 10, the battery pack further includes a housing frame assembly 5, and the housing frame assembly 5 includes a main housing 51 and a partition beam 52. The main housing 51 has a cavity, and the liquid cooling component 2 is connected to the inner wall of the main housing 51. Specifically, the liquid cooling component 2 can be fixedly connected to the main housing 51 by means of welding, riveting or bolt connection. The liquid cooling component 2 divides the cavity into upper and lower accommodation chambers, and one layer of battery cell modules 1 is placed in each accommodation chamber. That is, the upper and lower layers of battery cell modules 1 are correspondingly placed in the upper and lower accommodation chambers. In some embodiments, one or more partition beams 52 are provided in each accommodation chamber, and the partition beams 52 divide the accommodation chamber into a plurality of module chambers 510. The single-layer battery cell module 1 includes a plurality of battery cell modules 1, and the plurality of battery cell modules 1 are correspondingly placed in the plurality of module chambers 510. The arrangement of the partition beams 52 can separate the battery cell modules 1 from each other, prevent short circuit between two battery cell modules 1, and, when one of the battery cell modules 1 is out of control due to heat, can play a good isolation role to prevent spreading to other battery cell modules 1. In addition, the partition beams 52 can limit the positions of the battery cell modules 1 to ensure the stability and safety of the battery cells 11 in the battery pack.

[0057] In this embodiment, the partition beam 52 is an expansion beam in the battery field. The expansion beam is fixed to the main housing 51 by means of welding, riveting or bolt connection.

[0058] Exemplarily, referring to FIGS. 9 and FIG., four partition beams 52 are provided in each accommodation chamber, and the four partition beams 52 are arranged in a king shape to divide into four module chambers 510. Each layer of battery cell modules 1 includes four battery cell modules 1, and the four battery cell modules 1 are correspondingly placed in the four module chambers 510.

[0059] Correspondingly, four first heat-conducting structural adhesives 3 are provided in the upper layer, and each battery cell module 1 in the upper layer is bonded in the corresponding module chamber 510 by one first heat-conducting structural adhesive 3; four second heat-conducting structural adhesives 4 are provided in the lower layer, and each battery cell module 1 in the lower layer is bonded in the corresponding module chamber 510 by one second heat-conducting structural adhesive...

[0060] Referring to FIGS. 1 and FIG. 2, the housing frame assembly further includes two cover bodies 53, and the two cover bodies 53 are respectively detachably buckled to the openings of the two accommodation chambers. When the two layers of battery modules are distributed up and down, the two cover bodies 53 are respectively an upper cover and a bottom plate.

[0061] Referring again to Figures 1 and 2, the battery pack also includes a pressure strip 6, which presses and secures the battery cell 11 within the module chamber 510. Specifically, both ends of the pressure strip 6 are connected to the main housing 51, and the pressure strip 6 presses against the side of the outer shell 111 of the battery cell 11 facing away from the bottom wall of the module chamber 510. After the battery cell module 1 is placed inside the module chamber 510, the two ends of the pressure strip 6 are connected to the main housing 51, thereby pressing the battery cell module 1 firmly within the module chamber 510 and preventing the battery cell module 1 from shifting within the main housing. The pressure strip 6 is higher than the terminal post 112 provided on the outer shell 111. After the cover 53 is fastened to the main housing 51, it presses against the pressure strip 6 without pressing against the terminal post 112, which improves the stability of the pressure strip 6, thereby improving the stability and safety of the battery cell 11 within the battery pack.

[0062] In some embodiments, the two ends of the pressure strip 6 are connected to the main housing 51 by welding, riveting, or threading, as long as a stable connection between the pressure strip 6 and the main housing 51 can be achieved.

[0063] In some embodiments, the two ends of the pressure strip 6 can be connected to the partition beam 52 provided inside the main housing 51, or the two ends of the pressure strip 6 can also be connected to the inner wall of the main housing 51.

[0064] Referring to Figure 11, both ends of the outer casing of the battery cell 11 are pressed and fixed by the pressure strip 6, so that the battery cell 11 is subjected to balanced force and ensures the stability and safety of the battery cell 11 in the battery pack.

[0065] In some embodiments, the cover 53 and the main housing 51 can be connected by fasteners such as screws or bolts to ensure a secure connection between the cover 53 and the main housing 51 without loosening. Moreover, when a fault occurs inside the battery pack, it is convenient to disassemble the cover 53 for repair.

[0066] In some embodiments, referring to FIG11, the pressure strip 6 is provided with a material reduction cavity 61, which can reduce the amount of material used and reduce costs while ensuring strength and rigidity.

[0067] For example, each battery cell module 1 includes two rows of battery cells 11. Referring to Figure 11, three pressure strips 6 are provided corresponding to the two rows of battery cells 11, including two side pressure strips and one middle pressure strip. Each of the two rows of battery cells 11 has a side pressure strip on its shoulder away from each other, and the middle pressure strip presses against the shoulders of the two rows of battery cells 11 close to each other. The side pressure strip has a material reduction cavity 61. The width of the middle pressure strip is greater than the width of the side pressure strip, and it has two material reduction cavities 61. The two material reduction cavities 61 are separated by a spacer.

[0068] In some embodiments, a first adhesive layer 7 is sandwiched between the pressure strip 6 and the outer casing 111; a second adhesive layer 8 is sandwiched between the pressure strip 6 and the cover 53. The first adhesive layer 7 and the second adhesive layer 8 achieve bonding between the pressure strip 6 and the cover 53 and the outer casing 111 of the cell 11, resulting in faster assembly efficiency and improved battery pack production speed.

[0069] The first adhesive layer 7 and the second adhesive layer 8 are exemplarily polyurethane structural adhesives.

[0070] For example, the pressure strip 6 can be made of an insulating material, such as plastic, which has good insulation properties. Alternatively, the pressure strip 6 can include a metal strip and insulating films disposed on both sides of the metal strip, which can provide insulation while having high strength.

[0071] In this embodiment, the cover 53, pressure strip 6, cell module 1, and liquid cooling component 2 are sequentially bonded and connected to form a whole battery pack, resulting in high assembly efficiency and high overall rigidity. Furthermore, by eliminating the support bracket for the cell module 1, and using a single liquid cooling component 2 to simultaneously cool both the upper and lower cell modules 1, the overall pack structure is simplified, space utilization is improved, and the overall battery capacity can be increased, thus extending the driving range.

Claims

1. Battery pack, including: At least two layers of cell modules (1); Liquid cooling assembly (2) is provided between two adjacent layers of the battery cell module (1). The liquid cooling assembly (2) includes a first plate (21), a second plate (22) and a third plate (23). The second plate (22) is located between the first plate (21) and the third plate (23). A first cooling channel (24) is formed between the first plate (21) and the second plate (22), and a second cooling channel (25) is formed between the second plate (22) and the third plate (23). The first cooling channel (24) and the second cooling channel (25) are connected or not connected.

2. The battery pack according to claim 1, wherein, The side of the first plate (21) facing away from the second plate (22) is a plane; And / or, the side of the third plate (23) facing away from the second plate (22) is a plane.

3. The battery pack according to claim 2, wherein, The first plate (21) and the third plate (23) are both flat plates. The second plate (22) has a first flow channel groove (221) and a second flow channel groove (222) on both sides. The inner wall of the first flow channel groove (221) and the first plate (21) form the first cooling flow channel (24). The second flow channel groove (222) and the third plate (23) form the second cooling flow channel (25).

4. The battery pack according to claim 3, wherein, The second plate (22) has a first protrusion (223) and a second protrusion (224) protruding on both sides respectively. The first protrusion (223) and the second flow channel groove (222) are located on the same side of the second plate (22), and the second protrusion (224) and the first flow channel groove (221) are located on the same side of the second plate (22). The first convex hull (223) is arranged to form the first flow channel (221) on the side opposite to the second flow channel (222), and the second convex hull (224) is arranged to form the second flow channel (222) on the side opposite to the first flow channel (221).

5. The battery pack according to claim 4, wherein, The first convex bulge (223) is in sealed contact with the third plate (23), and the second convex bulge 224 is in sealed contact with the first plate 21.

6. The battery pack according to claim 2, wherein, A third flow channel groove is provided on the side of the first plate (21) facing the second plate (22), and the inner wall of the third flow channel groove and the second plate (22) form the first cooling flow channel (24). And / or, the third plate (23) is provided with a fourth flow channel groove on the side facing the second plate (22), and the inner wall of the fourth flow channel groove and the second plate (22) form the second cooling flow channel (25).

7. The battery pack according to claim 1, wherein, At least one of the first cooling channel (24) and the second cooling channel (25) is a serpentine channel.

8. The battery pack according to any one of claims 1-7, wherein, A first thermally conductive structural adhesive (3) is provided between the first plate (21) and the battery cell module (1); and / or, a second thermally conductive structural adhesive (4) is provided between the second plate (22) and the battery cell module (1).

9. The battery pack according to claim 8, wherein, Both the first thermally conductive structural adhesive (3) and the second thermally conductive structural adhesive (4) include a two-component polyurethane thermally conductive structural adhesive.

10. The battery pack according to any one of claims 1-7, wherein, The battery cell module (1) has two layers, and the two layers of the battery cell module (1) are arranged in a mirror symmetrical manner relative to the liquid cooling assembly (2). The battery cell module (1) includes multiple battery cells (11). Each battery cell (11) includes a shell (111) and a terminal (112). The terminal (112) is located on the side of the shell (111) facing away from the liquid cooling assembly (2).

11. The battery pack according to claim 10, the battery pack further comprising a frame assembly (5), the frame assembly (5) comprising a main housing (51) and a partition beam (52). The main housing (51) has a cavity, the liquid cooling assembly (2) is connected to the inner wall of the main housing (51), and the liquid cooling assembly (2) divides the cavity into two receiving chambers, each of which holds a layer of the battery cell module (1). Each of the accommodating chambers is provided with one or more partition beams (52), which divide the accommodating chamber into multiple module chambers (510). A single-layer battery cell module (1) includes multiple battery cell modules (1), and the multiple battery cell modules (1) are placed in the multiple module chambers (510) in a one-to-one correspondence.

12. The battery pack according to claim 11, wherein the frame assembly (5) further comprises two covers (53), the two covers (53) being detachably fastened to the openings of the two receiving chambers respectively; The battery pack also includes a pressure strip (6), the two ends of which are connected to the main housing (51), and the pressure strip (6) is pressed against the side of the outer shell (111) facing away from the bottom wall of the module chamber (510). The pressure strip (6) is higher than the pole post (112), and the cover (53) is pressed against the pressure strip (6).

13. The battery pack according to claim 12, wherein, The pressure bar (6) is provided with a material reduction cavity (61).

14. The battery pack according to claim 12, wherein, A first adhesive layer (7) is sandwiched between the pressure strip (6) and the outer shell (111); and / or, a second adhesive layer (8) is sandwiched between the pressure strip (6) and the cover (53).

15. The battery pack according to claim 12, wherein, The cover (53), pressure strip (6), battery cell module (1), and liquid cooling component (2) are sequentially bonded together.

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