Battery pack

Abstract

The utility model relates to power battery technical field especially, and it is a kind of battery pack, battery pack includes lower box and installs the top cover of lower box;Electricity core stack, including the multiple rows of cylindrical cell groups being arranged in accommodating cavity along first direction, and each row of cylindrical cell group includes multiple cylindrical cell arranged along second direction;Liquid cooling plate is set between two adjacent rows of cylindrical cell groups;Hang mounting crossbeam is set in accommodating cavity along first direction, and hang mounting crossbeam includes beam body part and multiple mounting parts, the bottom of beam body part is connected with the bottom plate of lower box, the both ends of beam body part are connected with the two side plates of lower box, multiple mounting parts are arranged in beam body part along first direction, and the clearance is formed between adjacent mounting parts, liquid cooling plate passes through hang mounting crossbeam from clearance, and the top end of each mounting part is connected with top cover.The utility model can simplify liquid cooling plate structure, save pipeline space, improve the volume utilization of battery pack, reduce cost, increase the overall rigidity of battery pack.

Description

Technical Field

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

[0002] Cylindrical battery packs are typically composed of a large number of cylindrical cells connected in series and parallel. The arrangement of the cylindrical cells inside the pack includes array and staggered arrangements. To ensure thermal management efficiency, liquid cooling water pipes (such as S-shaped aluminum pipes or flat pipes) are usually embedded in the gaps between the cells. The circulation of the coolant is used to achieve efficient heat dissipation, thereby maintaining the battery pack in a safe temperature range.

[0003] To enhance structural rigidity and impact resistance, most cylindrical battery packs currently incorporate transverse or longitudinal reinforcing beams for fixing and strengthening. However, while this design improves the overall stability of the battery pack, it also complicates the layout of the liquid cooling water pipe system. The liquid cooling water pipes must be routed around the reinforcing beams, which not only increases the pipe length and the number of joints but also significantly occupies the effective space inside the battery pack, ultimately reducing the volume utilization rate of the battery pack. Utility Model Content

[0004] This utility model provides a battery pack to solve the technical problem that the liquid cooling water pipe structure is complex, occupies a large space, and affects the volume utilization rate due to the setting of horizontal or vertical reinforcing beams in the battery pack.

[0005] This utility model provides a battery pack, the battery pack comprising: The lower housing has a receiving cavity and an opening at the top of the lower housing; A top cover is installed on the lower housing and seals the opening; The cell stack includes multiple rows of cylindrical cell groups arranged in the receiving cavity along a first direction, and each row of cylindrical cell groups includes multiple cylindrical cells arranged along a second direction. A liquid cooling plate is disposed between two adjacent rows of cylindrical battery cells; A mounting beam is disposed within the receiving cavity along a first direction. The mounting beam includes a beam body and multiple mounting parts. The bottom of the beam body is connected to the bottom plate of the lower housing. The two ends of the beam body along the first direction are respectively connected to the two side plates of the lower housing. The multiple mounting parts are arranged along the first direction on the side of the beam body facing the top cover. A clearance groove is formed between adjacent mounting parts along a second direction. The liquid cooling plate passes through the mounting beam through the clearance groove. The top of each mounting part is connected to the top cover.

[0006] In one embodiment of the present invention, there is one mounting beam located in the middle of the receiving cavity along the second direction; or there are multiple mounting beams arranged in parallel along the second direction.

[0007] In one embodiment of the present invention, the portion of the liquid cooling plate corresponding to the cylindrical battery cell is an arc-shaped portion, the portion of the liquid cooling plate located within the clearance groove is a straight portion, and the groove wall of the clearance groove is a plane corresponding to the straight portion.

[0008] In one embodiment of the present invention, the portion of the liquid cooling plate corresponding to the cylindrical battery cell is an arc-shaped portion, and two adjacent liquid cooling plates are cross-connected in the same clearance groove through a cross portion.

[0009] In one embodiment of the present invention, a connecting hole is provided on the top surface of the mounting part, and the mounting part is connected to the top cover by a fastener passing through the connecting hole, and the fastener presses the top cover tightly against the mounting part.

[0010] In one embodiment of this utility model, the mounting portion includes a first mounting portion and a second mounting portion. The first mounting portion is connected to the top cover via a first fastener, and a first sealing element is provided between the first mounting portion and the top cover. A second sealing element is provided between the first fastener and the top cover. The first mounting portion has a first through hole along the height direction, penetrating the beam portion and the first mounting portion. The first fastener has a second through hole corresponding to the first through hole. The first through hole and the second through hole are connected to form a mounting hole. The second mounting portion is connected to the top cover via a second fastener.

[0011] In one embodiment of the present invention, the first fastener is a nut with external threads, including a screw portion and a nut portion connected to the screw portion, the second through hole axially penetrating the screw portion and the nut portion, the screw portion threadedly engaging with the connecting hole of the first mounting portion, the nut portion pressing the seal against the top cover, and the second fastener is a bolt.

[0012] In one embodiment of this utility model, the bottom surface of the mounting beam is provided with a countersunk hole coaxially arranged with the mounting hole.

[0013] In one embodiment of the present invention, the mounting part includes a cylindrical section and a boss section connected vertically, and the connecting hole is opened on the top surface of the cylindrical section; the boss section has weight-reducing grooves on both sides along the second direction.

[0014] In one embodiment of the present invention, a top beam corresponding to the mounting beam is provided on the side of the top cover facing the battery cell stack, and both the top cover and the top beam are connected to the top of each mounting part by fasteners.

[0015] The beneficial effects of this utility model are as follows: The battery pack proposed in this utility model has a mounting beam in the lower casing. Multiple mounting parts are formed on the beam body of the mounting beam, and clearance grooves are formed between adjacent mounting parts. This allows the liquid cooling plate to pass through the mounting beam through the clearance grooves without the need for additional bending design, simplifying the water pipe structure, saving pipe space, reducing the number of water pipes, and improving the volume utilization rate of the battery pack. Furthermore, the multiple mounting parts of the mounting beam are connected to the top cover, enhancing the connection strength between the lower casing and the top cover, thereby increasing the overall rigidity of the battery pack and reducing its weight and cost. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of a battery pack provided in an embodiment of the present invention; Figure 2 A partial structural diagram of a battery pack provided in an embodiment of this utility model (excluding the top cover). Figure 3 This is a partial structural diagram of a battery pack provided in an embodiment of the present invention (excluding the top cover and the cell stack). Figure 4 for Figure 3 Enlarged view of A in the middle; Figure 5 This is a partial top view of the battery pack provided in an embodiment of the present invention; Figure 6 for Figure 5 Enlarged view of B in the middle; Figure 7 This is a top view of the lower housing provided in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of the mounting beam in the lower box according to an embodiment of this utility model. Figure 1 ; Figure 9 A schematic diagram of the structure of the mounting beam in the lower box according to an embodiment of this utility model. Figure 2 ; Figure 10 for Figure 9 Enlarged view of C; Figure 11This is a schematic diagram of the structure of the mounting beam provided in one embodiment of the present utility model; Figure 12 A cross-sectional view of the mounting beam provided in one embodiment of this utility model; Figure 13 A top view of a battery pack provided according to an embodiment of the present invention; Figure 14 for Figure 13 Sectional view of DD; Figure 15 for Figure 14 Enlarged view of E in the middle; Figure 16 for Figure 14 Enlarged view of F in the middle; Figure 17 This is a partial structural schematic diagram of a liquid cooling plate provided in an embodiment of the present invention; Figure 18 This is a partial top view of the liquid cooling plate provided in an embodiment of the present invention; Figure 19 This is a partial top view of the liquid cooling plate provided in another embodiment of the present invention.

[0018] The attached figures are labeled as follows: 10-Lower housing; 11-Bottom plate; 12-Side plate; 13-End plate; 101-Receiving cavity; 102-Weld bead; 20-Top cover; 30-Cell stack; 40 - Liquid cooling plate; 41 - Support plate; 42 - Connecting end; 401 - Curved part; 402 - Straight part; 403 - Intersection part; 50-Mounting beam; 51-Beam body; 52-Mounting part; 52a-Boss section; 52b-Cylindrical section; 521-First mounting part; 522-Second mounting part; 53-Allowing groove; 54-First connecting hole; 55-Second connecting hole; 56-First through hole; 57-Counterhead; 58-First seal; 61-First fastener; 601-Second through hole; 611-Screw part; 612-Nut part; 62-Second seal; 63-Second fastener. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0022] Please see Figures 1 to 8 This utility model provides a battery pack in one embodiment, the battery pack including: a lower housing 10, a top cover 20, a cell stack 30, a liquid cooling plate 40, and a mounting beam 50, see reference. Figure 1 and Figure 2 The lower housing 10 has an opening at its top and a receiving cavity 101. A top cover 20 is installed on the lower housing 10 and seals the opening. The cell stack 30 includes multiple rows of cylindrical cell groups arranged along a first direction within the receiving cavity 101, and each row of cylindrical cell groups includes multiple cylindrical cells arranged along a second direction. (See reference...) Figure 3 and Figure 4 The liquid cooling plate 40 is disposed between two adjacent rows of cylindrical battery cells; the mounting beam 50 is disposed in the receiving cavity 101 along the first direction. The mounting beam 50 includes a beam body 51 and multiple mounting parts 52. The bottom of the beam body 51 is connected to the bottom plate 11 of the lower housing 10. The two ends of the beam body 51 along the first direction are respectively connected to the two side plates 12 of the lower housing 10. Multiple mounting parts 52 are arranged along the first direction on the side of the beam body 51 facing the top cover 20. A clearance groove 53 is formed between adjacent mounting parts 52 and runs through the second direction. The liquid cooling plate 40 passes through the mounting beam 50 through the clearance groove 53. The top of each mounting part 52 is connected to the top cover 20.

[0023] Specifically, the first direction is Figure 2 The X direction in the middle, the second direction is Figure 2 The Y-direction and the height direction are... Figure 2 The Z-direction in the middle. See also Figure 2 and Figure 8The lower housing 10 includes a base plate 11, two side plates 12, and two end plates 13. The side plates 12 are located on opposite sides of the base plate 11, and the end plates 13 are located on the other two sides of the base plate 11. The base plate 11, side plates 12, and end plates 13 are sequentially and fixedly connected to form a receiving cavity 101. The base plate 11, side plates 12, and end plates 13 can be fixedly connected by welding or snap-fitting. In this embodiment, the base plate 11 and the two side plates 12 are an integral structure, that is, the base plate 11 and the two side plates 12 are integrated into an integral U-shaped frame structure. A top cover 20 is installed at the top of the lower housing 10 to close the lower housing 10.

[0024] See Figure 2 The cell stack 30 includes multiple rows of cylindrical cell groups arranged along a first direction. Each row of cylindrical cell groups includes multiple cylindrical cells arranged along a second direction, and the cylindrical cells in adjacent rows of cylindrical cell groups are staggered. An electrical connector is provided on the side of the cylindrical cell facing the top cover 20, and the electrical connector is connected to the terminals of each cylindrical cell.

[0025] See Figure 2 and Figure 3 The liquid cooling plate 40 is disposed between two adjacent rows of cylindrical cells. In this example, the liquid cooling plate 40 adopts a serpentine cooling plate. The liquid cooling plate 40 dissipates heat from the cylindrical cells to keep them at the required operating temperature, ensuring that the battery pack can operate stably under various operating conditions.

[0026] See Figure 3 and Figure 4 The mounting beam 50 is positioned within the receiving cavity 101 along the first direction, see reference. Figure 11 and Figure 12 The mounting beam 50 includes a beam body 51 and multiple mounting parts 52. The bottom of the beam body 51 is connected to the base plate 11 by welding. Figure 7 The diagram shows the weld 102 on the lower housing 10 used for welding the mounting beam 50, and the two ends of the beam 51 along the first direction are connected to the two side plates 12 by welding (e.g., Figure 9 and Figure 10 As shown in the diagram, this ensures a reliable connection between the mounting beam 50 and the lower housing 10. By installing the mounting beam 50 within the receiving cavity 101, the stress can be distributed, and the overall rigidity and stability of the battery pack can be enhanced.

[0027] See Figure 3 and Figure 4Multiple mounting parts 52 are arranged along the first direction on the side of the beam 51 facing the top cover 20, and the top of each mounting part 52 is connected to the top cover 20, thereby strengthening the connection between the top cover 20 and the lower box 10 through the mounting beam 50, ensuring that the top cover 20 remains stable during the operation of the battery pack and will not loosen due to internal pressure changes or external vibrations, and also increasing the overall rigidity of the battery pack.

[0028] See Figures 3 to 6 A clearance groove 53 extending along the second direction is formed between adjacent mounting sections 52, allowing the liquid cooling plate 40 to pass through the mounting beam 50 via the clearance groove 53. This eliminates the need for bending the liquid cooling plate 40, simplifies the water pipe structure, saves pipe space, reduces the number of water pipes, lowers the cost of the liquid cooling plate 40, and resolves the spatial conflict between the mounting beam 50 and the liquid cooling plate 40, thereby improving the volume utilization rate of the battery pack. This design ensures that the mounting beam 50 can function properly as a structural support without affecting the installation and heat dissipation function of the liquid cooling plate 40, resulting in a more compact and rational internal structure of the battery pack and improved space utilization.

[0029] In some embodiments, the mounting beam 50 is a single beam located in the middle of the receiving cavity 101 along the second direction (e.g., Figure 2 (As shown). By setting a mounting beam 50 in the middle of the receiving cavity 101 along the second direction, it can be ensured that the force on both sides of the lower box 10 is basically the same, and the deformation of the lower box 10 due to excessive force on one side can be avoided.

[0030] Alternatively, in other embodiments, there are multiple mounting beams 50 arranged parallel to each other along the second direction. By employing multiple mounting beams 50 arranged parallel to each other along the second direction, the overall rigidity of the battery pack can be enhanced, the risk of damage to internal components of the battery pack can be reduced, and the impact resistance of the battery pack can be improved.

[0031] See Figures 2 to 6 As shown, a liquid cooling plate 40 is disposed between two rows of cylindrical battery cells. The liquid cooling plate 40 is attached to a portion of the outer circumferential surface of the cylindrical battery cells to achieve heat dissipation. In this embodiment, see reference... Figure 17 The liquid cooling plate 40 includes multiple spaced support plates 41, each support plate 41 having a connecting end 42. The connecting end 42 of each support plate 41 is connected to a connector, and the connecting end 42 is located between the cell stack 30 and one of the end plates 13. The multiple support plates 41 are connected on the same side, and each support plate 41 is located between two adjacent rows of cylindrical cells. Each support plate 41 is provided with a cooling channel. For example, one support plate 41 can be set every one, two, or other rows, that is, the number of support plates 41 can be adjusted according to the number of cylindrical cells to improve its applicability.

[0032] See Figure 5 and Figure 6 Each support plate 41 of each liquid cooling plate 40 passes through the mounting beam 50 through the clearance groove 53. In this example, each clearance groove 53 allows at least one support plate 41 to pass through, for example, one support plate 41, two support plates 41 or more support plates 41 can pass through.

[0033] See Figure 12 At least some of the clearance grooves 53 have unequal groove widths along the first direction. In this example, different groove widths can be set for different numbers of support plates 41.

[0034] See Figure 6 and Figure 18 In some embodiments, the portion of the liquid cooling plate 40 corresponding to the cylindrical battery cell is an arc-shaped portion 401, and the portion of the liquid cooling plate 40 located within the clearance groove 53 is a straight portion 402. The groove wall of the clearance groove 53 is a plane corresponding to the straight portion 402. Specifically, the arc-shaped portions 401 provided by each support plate 41 of the liquid cooling plate 40 can fit against the outer circumferential surface of the cylindrical battery cell, greatly increasing the contact area between the liquid cooling plate 40 and the battery cell, thereby improving the heat dissipation efficiency of the cylindrical battery cell. By making the portion of the liquid cooling plate 40 located within the clearance groove 53 a straight portion 402, the liquid cooling plate 40 can be inserted more smoothly into the clearance groove 53 of the mounting beam 50 during installation. The straight portion 402 can more easily cooperate with the groove wall of the clearance groove 53, improving assembly efficiency. Furthermore, this adaptability allows the liquid cooling plate 40 to maintain a fixed position and posture within the clearance groove 53, making it less prone to shaking or displacement. The liquid cooling plate 40 does not require a bending design, avoiding the bending of the internal flow channel. The liquid cooling plate 40 can pass through the clearance groove 53 through the straight part 402, saving pipeline space and realizing the compact layout of the liquid cooling plate 40 in a limited space.

[0035] See Figure 19 In other embodiments, the portion of the liquid cooling plate 40 corresponding to the cylindrical battery cell is an arc-shaped portion 401, and two adjacent liquid cooling plates 40 are cross-connected in the same clearance groove 53 through a cross portion 403. Specifically, the arc-shaped portions 401 provided by each support plate 41 of the liquid cooling plate 40 can fit against the outer peripheral surface of the cylindrical battery cell, greatly increasing the contact area between the liquid cooling plate 40 and the battery cell, thereby improving the heat dissipation efficiency of the cylindrical battery cell. Adjacent liquid cooling plates 40 are cross-connected in the same clearance groove 53 via a cross portion 403. The cross portion 403 is located in the clearance groove 53, and the two opposite side walls of the cross portion 403 cooperate with the groove wall of the clearance groove 53, which facilitates the positioning and installation of the cross portion 403 in the clearance groove 53, improves the assembly efficiency of the liquid cooling plate 40, and also ensures the installation stability of the liquid cooling plate 40. The liquid cooling plate 40 does not need to be bent, avoiding the bending of the internal flow channel. The liquid cooling plate 40 can pass through the clearance groove 53 through the cross portion 403, saving pipeline space and realizing a compact layout of the liquid cooling plate 40 in a limited space.

[0036] See Figure 11 and Figure 12 It should be noted that the top surface of the mounting part 52 is provided with a connecting hole. The mounting part 52 is connected to the top cover 20 by fasteners passing through the connecting holes, and the fasteners press the top cover 20 tightly against the mounting part 52. Specifically, by providing connecting holes on the top surface of each mounting part 52... Figure 11 The first connecting hole 54 and the second connecting hole 55 in the mounting part 52 facilitate the connection between the mounting part 52 and the top cover 20 via fasteners, ensuring that the top cover 20 will not shift or wobble after installation, and guaranteeing the stability of the relative position between the top cover 20 and the mounting part 52. In this example, the connecting hole is a threaded hole with internal threads, and the fastener has external threads adapted to the internal threads. The fastener and the connecting hole are connected by a threaded engagement, pressing the top cover 20 tightly against the top of the mounting part 52.

[0037] Continue reading Figures 11 to 16 In the above embodiment, the mounting part 52 includes a first mounting part 521 and a second mounting part 522. The first mounting part 521 is connected to the top cover 20 through a first fastener 61, and a first sealing member 58 is provided between the first mounting part 521 and the top cover 20. A second sealing member 62 is provided between the first fastener 61 and the top cover 20. The first mounting part 521 has a first through hole 56 that penetrates the beam body part 51 and the first mounting part 521 along the height direction. The first fastener 61 has a second through hole 601 corresponding to the first through hole 56. The first through hole 56 and the second through hole 601 are connected to form a mounting hole.

[0038] In this example, two first mounting parts 521 and multiple second mounting parts 522 are provided. The two first mounting parts 521 are evenly distributed along the first direction on the beam part 51. The battery pack is connected to the whole vehicle through the first mounting parts 521. The evenly distributed two first mounting parts 521 help to ensure the installation stability of the battery pack. The multiple spaced second mounting parts 522 ensure the connection stability between the mounting beam 50 on the lower box 10 and the top cover 20.

[0039] See Figures 12 to 16 The first mounting part 521 has a first connecting hole 54 on its top surface. A first through hole 56 is coaxially arranged with the first connecting hole 54, and the diameter of the first connecting hole 54 is larger than the diameter of the first through hole 56. The first connecting hole 54 is located above the first through hole 56. The first mounting part 521 is connected to the top cover 20 via a first fastener 61 passing through the first connecting hole 54. The first fastener 61 presses the top cover 20 tightly against the top of the first mounting part 521, and the sealing between the first fastener 61 and the top cover 20 is improved by a first sealing member 58 and a second sealing member 62. The first sealing member 58 and the second sealing member 62 can be sealing rings.

[0040] Furthermore, the bottom surface of the mounting beam 50 is provided with a countersunk hole 57 coaxially arranged with the mounting hole. The diameter of the countersunk hole 57 is larger than the diameter of the first through hole 56. This facilitates the connection between the lower housing 10, the mounting beam 50 and the whole vehicle through fasteners.

[0041] See Figures 14 to 16 In the above embodiment, the first fastener 61 is a nut with external threads, including a screw portion 611 and a nut portion 612 connected to the screw portion 611. A second through hole 601 axially penetrates the screw portion 611 and the nut portion 612. The screw portion 611 is threadedly engaged with the connecting hole of the first mounting portion 521, and the nut portion 612 presses the seal against the top cover 20. The screw portion 611 has external threads and is threadedly engaged with the first connecting hole 54, ensuring the reliability of the connection between the first fastener 61 and the first mounting portion 521. The nut portion 612 presses the seal against the top cover 20, improving the sealing performance and connection strength between the first fastener 61 and the top cover 20.

[0042] In the above embodiment, the second mounting part 522 is connected to the top cover 20 via a second fastener 63, which is a bolt. The top surface of the second mounting part 522 has a second connecting hole 55. The second mounting part 522 is connected to the top cover 20 via the second fastener 63 passing through the second connecting hole 55, and the second fastener 63 presses the top cover 20 tightly against the top of the second mounting part 522.

[0043] See Figure 11 It is worth mentioning that the mounting part 52 includes a cylindrical section 52b and a boss section 52a connected vertically, with a connecting hole on the top surface of the cylindrical section 52b; the boss section 52a has weight-reducing grooves on both sides along the second direction. Specifically, the first mounting part 521 and the second mounting part 522 are set at the same height, and both the first mounting part 521 and the second mounting part 522 include a cylindrical section 52b and a boss section 52a. The cylindrical section 52b is located on top of the boss section 52a. The boss section 52a is cuboid in shape, and the cylindrical section 52b is cylindrical. The outer diameter of the cylindrical section 52b of the second mounting part 522 is smaller than the outer diameter of the cylindrical section 52b of the first mounting part 521. Furthermore, the boss section 52a has weight-reducing grooves on both sides along the second direction to reduce the weight of the overall mounting beam 50 while ensuring connection strength.

[0044] In some embodiments, a top beam corresponding to the mounting beam 50 is provided on the side of the top cover 20 facing the cell stack 30. Both the top cover 20 and the top beam are connected to the top of each mounting part 52 by fasteners. Specifically, the top beam is provided on the inner side of the top cover 20 along the first direction, and the top beam is corresponding to the mounting beam 50, that is, the position and number of the top beams correspond to the mounting beam 50. Furthermore, multiple top beam holes are arranged on the top beam along the first direction, each top beam hole corresponding to each mounting part 52. By providing a top beam on the side of the top cover 20 facing the cell stack 30, the connection strength between the top cover 20 and each mounting part 52 of the mounting beam 50 can be enhanced, further improving the connection reliability between the top cover 20 and the lower housing 10.

[0045] In summary, the battery pack proposed by this utility model, by setting a mounting beam 50 in the lower housing 10, and by forming multiple mounting parts 52 on the beam body 51 of the mounting beam 50, and forming a clearance groove 53 between adjacent mounting parts 52, allows the liquid cooling plate 40 to pass through the mounting beam 50 through the clearance groove 53 without the need for additional bending design, simplifying the water pipe structure, saving pipe space, reducing the number of water pipes, and improving the volume utilization rate of the battery pack; furthermore, by connecting the multiple mounting parts 52 of the mounting beam 50 to the top cover 20, the connection strength between the lower housing 10 and the top cover 20 is enhanced, thereby increasing the overall rigidity of the battery pack and reducing the weight and cost of the battery pack.

[0046] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: The lower housing has a receiving cavity and an opening at the top of the lower housing; A top cover is installed on the lower housing and seals the opening; The cell stack includes multiple rows of cylindrical cell groups arranged in the receiving cavity along a first direction, and each row of cylindrical cell groups includes multiple cylindrical cells arranged along a second direction. A liquid cooling plate is disposed between two adjacent rows of cylindrical battery cells; A mounting beam is disposed within the receiving cavity along a first direction. The mounting beam includes a beam body and multiple mounting parts. The bottom of the beam body is connected to the bottom plate of the lower housing. The two ends of the beam body along the first direction are respectively connected to the two side plates of the lower housing. The multiple mounting parts are arranged along the first direction on the side of the beam body facing the top cover. A clearance groove is formed between adjacent mounting parts along a second direction. The liquid cooling plate passes through the mounting beam through the clearance groove. The top of each mounting part is connected to the top cover.

2. The battery pack according to claim 1, characterized in that, The mounting beam is one and located in the middle of the receiving cavity along the second direction; or the mounting beam is multiple and arranged in parallel along the second direction.

3. The battery pack according to claim 1, characterized in that, The portion of the liquid cooling plate corresponding to the cylindrical battery cell is an arc-shaped portion, and the portion of the liquid cooling plate located within the clearance groove is a straight portion. The groove wall of the clearance groove is a plane corresponding to the straight portion.

4. The battery pack according to claim 1, characterized in that, The portion of the liquid cooling plate corresponding to the cylindrical battery cell is arc-shaped, and two adjacent liquid cooling plates are cross-connected in the same clearance groove through a cross section.

5. The battery pack according to claim 1, characterized in that, The top surface of the mounting part is provided with a connection hole, and the mounting part is connected to the top cover by a fastener passing through the connection hole. The fastener presses the top cover tightly against the mounting part.

6. The battery pack according to claim 5, characterized in that, The mounting portion includes a first mounting portion and a second mounting portion. The first mounting portion is connected to the top cover via a first fastener, and a first sealing element is provided between the first mounting portion and the top cover. A second sealing element is provided between the first fastener and the top cover. The first mounting portion has a first through hole along the height direction, penetrating the beam portion and the first mounting portion. The first fastener has a second through hole corresponding to the first through hole. The first through hole and the second through hole are connected to form a mounting hole. The second mounting portion is connected to the top cover via a second fastener.

7. The battery pack according to claim 6, characterized in that, The first fastener is a nut with external threads, including a screw portion and a nut portion connected to the screw portion. The second through hole extends axially through the screw portion and the nut portion. The screw portion is threadedly engaged with the connecting hole of the first mounting portion. The nut portion presses the seal against the top cover. The second fastener is a bolt.

8. The battery pack according to claim 6, characterized in that, The bottom surface of the mounting beam has a countersunk hole that is coaxial with the mounting hole.

9. The battery pack according to claim 5, characterized in that, The mounting part includes a cylindrical section and a boss section connected vertically, and the connecting hole is opened on the top surface of the cylindrical section; the boss section has weight reduction grooves on both sides along the second direction.

10. The battery pack according to claim 1, characterized in that, The top cover has a top beam corresponding to the mounting beam on the side facing the battery cell stack. Both the top cover and the top beam are connected to the top of each mounting part by fasteners.

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