Battery pack box and battery pack

Abstract

The utility model discloses a kind of battery pack box and battery pack, including frame and anti-expansion beam, the frame includes first end plate and two second end plates, two The second end plate is oppositely arranged, and the first end plate is connected between two The second end plate. The anti-expansion beam is arranged between two The second end plate, and the anti-expansion beam is detachably connected to The second end plate, and accommodating cavity is formed between The anti-expansion beam, The first end plate and The second end plate, and the accommodating cavity is used to accommodate electric core group, and The anti-expansion beam and The first end plate are used to clamp opposite sides of The electric core group. The present application aims to solve the technical problem of how to improve the space utilization of battery pack.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicle technology, the battery system, as a core component of the vehicle, has a significant impact on the energy density, lightweight level, and manufacturing cost of the entire vehicle through its structural design and integration method. Currently, in common battery structure designs, individual components such as cells and end plates are typically assembled into modules, and multiple modules are then installed into the battery pack to form the complete battery pack structure. This "modular" design approach offers a certain degree of versatility and ease of maintenance, but it has significant shortcomings in terms of overall pack space utilization, structural complexity, and weight control.

[0003] Specifically, in a modular structure, the modules and the battery pack housing need to be positioned and fixed by several structural components, which increases the number of auxiliary parts such as connectors and buffers, and reduces the utilization rate of the effective space inside the housing.

[0004] Therefore, the existing modular structure is difficult to meet the development trend of electric vehicles that emphasize both high energy density and lightweight structure. There is an urgent need to propose a battery pack integration solution with a more compact structure and higher space utilization. Utility Model Content

[0005] One objective of this invention is to provide a battery pack housing and a battery pack, which aims to solve the technical problem of how to improve the space utilization rate of the battery pack.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a solution as follows: a battery pack housing, comprising: a frame, the frame including a first end plate and two second end plates, the two second end plates being disposed opposite to each other, and the first end plate being connected between the two second end plates;

[0007] An anti-expansion beam is disposed between two second end plates and is detachably connected to the second end plates. A receiving cavity is formed between the anti-expansion beam, the first end plate, and the second end plates. The receiving cavity is used to accommodate the battery cell assembly. The anti-expansion beam and the first end plate are used to clamp the opposite sides of the battery cell assembly.

[0008] Optionally, the frame includes a connecting part disposed in the receiving cavity and connected to the second end plate. The connecting part has a stress groove, and at least part of the anti-expansion beam is limited and matched with the stress groove. The anti-expansion beam is detachably connected to the second end plate through the connecting part.

[0009] Optionally, the inner wall of the stress groove includes a plurality of first walls and a plurality of second walls, the first walls and the second walls are arranged at an angle, the first walls and the second walls are alternately arranged and adjacent to each other, and the first walls and the second walls abut against the anti-expansion beam.

[0010] Optionally, the battery pack housing includes bolts, the anti-expansion beam has a first hole, the connecting part has a second hole, the second hole communicates with the stress groove, the bolt head is located on the side of the first hole away from the connecting part, and the bolt shank passes through the first hole and the second hole in sequence and is connected to the connecting part.

[0011] Optionally, the expansion beam has a mounting groove that communicates with the first hole, and the bolt head is located inside the mounting groove.

[0012] Optionally, the frame includes a reinforcing part disposed on the side of the connecting part away from the receiving cavity, the reinforcing part and the connecting part are connected, and are also connected to the second end plate.

[0013] Optionally, the reinforcement includes an adjacent third wall and a fourth wall. The third wall is attached to and connected to the anti-expansion beam and the second end plate, respectively. The fourth wall is arc-shaped, with one end tangent to the side wall of the connection and the other end tangent to the side wall of the second end plate.

[0014] Optionally, the reinforcement protrudes from the connection and abuts against the expansion beam.

[0015] Optionally, the battery pack housing includes a liquid cooling plate, which includes a flow guide and a cooling section. The flow guide has an inlet and an outlet, and the cooling section has a flow channel inside, which is connected to the inlet and outlet respectively. The cooling section is connected to the frame and closes the opening on one side of the receiving cavity. The anti-expansion beam has a relief groove, and the flow guide is inserted into the relief groove.

[0016] Secondly, this application provides a battery pack, including a cell assembly and a battery pack housing. The cell assembly includes a plurality of cells and a first pretensioner. The first pretensioner is disposed between the plurality of cells and is elastic. An anti-expansion beam and a first end plate are clamped on opposite sides of the cell assembly. The first pretensioner is in a deformed state.

[0017] Optionally, the battery cell assembly includes an insulating sheet and a second pre-tightening member. The insulating sheet is disposed between the first end plate and the adjacent battery cell or between the anti-expansion beam and the adjacent battery cell, and the second pre-tightening member is disposed between the insulating sheet and the adjacent battery cell.

[0018] The beneficial effects of this utility model are as follows: The battery pack housing and battery pack include a frame and an anti-expansion beam. The frame includes a first end plate and two second end plates, which are arranged opposite to each other. The first end plate is connected between the two second end plates. The anti-expansion beam is disposed between the two second end plates and is detachably connected to the second end plates. A receiving cavity is formed between the anti-expansion beam, the first end plate, and the second end plates. The receiving cavity is used to accommodate the battery cell assembly. The anti-expansion beam and the first end plate are used to clamp the opposite sides of the battery cell assembly.

[0019] In practical applications, the battery cell assembly can be directly clamped and fixed within the housing frame by the anti-expansion beam and the first end plate, thus eliminating the need for end plates, cable ties, and other structures in the module, improving the compactness of the system structure. At the same time, the anti-expansion beam provides axial limiting and anti-expansion support for the battery cell assembly, effectively alleviating the internal stress accumulation caused by the expansion and deformation of the battery cell, improving structural stability and deformation resistance. The anti-expansion beam replaces the reinforcing structure in the traditional battery pack and the end plates, cable ties, and other structures in the module, thereby improving the compactness of the battery pack structure and increasing space utilization. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present invention; Figure 2 This is a structural schematic diagram of the battery pack housing provided in an embodiment of the present invention; Figure 3 This is provided by the embodiment of the present utility model. Figure 2 A magnified view of a portion of region A in the middle; Figure 4 This is a cross-sectional structural diagram of the first hole and the second hole provided in an embodiment of the present invention; Figure 5 This is provided by the embodiment of the present utility model. Figure 4 A magnified view of a portion of region B in the middle; Figure 6 This is a partial structural schematic diagram of a liquid cooling plate provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the battery pack provided in an embodiment of the present invention; Figure 8 This is provided by the embodiment of the present utility model. Figure 7 A magnified view of a portion of region C.

[0022] Explanation of icon numbers: 20. Frame; 21. First end plate; 22. Second end plate; 23. Connecting part; 231. Stress groove; 2311. First wall; 2312. Second wall; 232. Second hole; 24. Reinforcing part; 241. Third wall; 242. Fourth wall; 30. Anti-expansion beam; 31. First hole; 32. Mounting groove; 33. Leaving groove; 40. Receiving cavity; 50. Bolt; 60. Liquid cooling plate; 61. Flow guide; 611. Liquid inlet; 612. Liquid outlet; 62. Cooling part; 70. Cell assembly; 71. Cell; 72. First pre-tightening member; 73. Second pre-tightening member; 74. Insulating sheet. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Before introducing the embodiments of this application, the background technology involved in this application will be introduced first.

[0025] The traditional module includes a cell assembly 70 and end plates clamped on both sides of the cell assembly 70. The two end plates are fixed by cable ties or other structures. The end plates are fixed to the inside of the battery pack housing by bolts 50 or other structures. The inside of the battery pack housing is also equipped with a reinforcing structure to improve the strength and rigidity of the battery pack.

[0026] However, traditional modules are difficult to meet the development trend of electric vehicles that emphasize both high energy density and lightweight structure. There is an urgent need to propose a battery pack integration solution with a more compact structure, higher space utilization, and simpler assembly process.

[0027] Please see Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the battery pack housing provided in an embodiment of this utility model.

[0028] In a first aspect, this utility model provides a battery pack housing, including a frame 20 and an anti-expansion beam 30. The frame 20 includes a first end plate 21 and two second end plates 22, which are disposed opposite to each other. The first end plate 21 is connected between the two second end plates 22. The anti-expansion beam 30 is disposed between the two second end plates 22 and is detachably connected to the second end plates 22. A receiving cavity 40 is formed between the anti-expansion beam 30, the first end plate 21, and the second end plates 22. The receiving cavity 40 is used to accommodate a battery cell assembly 70, and the anti-expansion beam 30 and the first end plate 21 are used to clamp the opposite sides of the battery cell assembly 70.

[0029] In practical applications, the cell assembly 70 can be directly clamped and fixed within the housing frame 20 by the anti-expansion beam 30 and the first end plate 21, thus eliminating the need for end plates, cable ties, and other structures in the module, thereby improving the compactness of the system structure. At the same time, the anti-expansion beam 30 can provide axial limiting and anti-expansion support for the cell assembly 70, effectively alleviating the internal stress accumulation caused by the expansion deformation of the cell 71, improving structural stability and deformation resistance. The anti-expansion beam 30 replaces the reinforcing structure in the traditional battery pack and the end plates, cable ties, and other structures in the module, thereby improving the compactness of the battery pack structure and increasing space utilization.

[0030] Therefore, this technical solution effectively solves the problems of complex structure, low space utilization and large system weight of existing battery pack modular design, and achieves the technical effects of lightweight, compact layout and high energy density of battery pack.

[0031] In one embodiment, see Figure 3 The frame 20 includes a connecting part 23, which is disposed in the receiving cavity 40 and connected to the second end plate 22. The connecting part 23 has a stress groove 231. At least part of the anti-expansion beam 30 is limited and matched with the stress groove 231. The anti-expansion beam 30 is detachably connected to the second end plate 22 through the connecting part 23.

[0032] In practical applications, this application provides a connecting part 23 in the frame 20, which is located in the receiving cavity 40 and connected to the second end plate 22. This structurally achieves a stable assembly relationship between the anti-expansion beam 30 and the second end plate 22, further improving the module's fixing strength and reliability. Simultaneously, a stress groove 231 is provided on the connecting part 23, allowing the anti-expansion beam 30 to be at least partially inserted and limited by the stress groove 231. When the module expands due to heat or vibrates during operation, the anti-expansion beam 30 moves restricted within the stress groove 231, providing dual limiting and stress buffering effects, thereby effectively absorbing structural stress transmission and mitigating impact concentration. Furthermore, the anti-expansion beam 30 is detachably connected to the second end plate 22 via the connecting part 23, improving the convenience of module assembly and maintenance, and overcoming the problems of complex assembly and low disassembly efficiency caused by traditional module end plates being fixed with cable ties or bolts 50. The overall structure ensures reliable connection while also considering flexible limiting and structural buffering, thus achieving multiple technical effects of module connection stability, buffering, and ease of maintenance.

[0033] In this embodiment, the stress groove 231 extends through both sides of the connecting portion 23 along its thickness direction and through the side of the connecting portion 23 facing the anti-expansion beam 30 along its height direction. In other embodiments, the stress groove 231 may only extend through the side of the connecting portion 23 facing the anti-expansion beam 30, such that after at least a portion of the anti-expansion beam 30 is inserted into the stress groove 231, the inner wall of the stress groove 231 covers the anti-expansion beam 30.

[0034] Optionally, see Figure 3 and Figure 5 The inner wall of the stress groove 231 includes a plurality of first walls 2311 and a plurality of second walls 2312. The first walls 2311 and the second walls 2312 are arranged at an angle. The first walls 2311 and the second walls 2312 are alternately arranged and adjacent to each other. The first walls 2311 and the second walls 2312 abut against the anti-expansion beam 30.

[0035] In practical applications, multiple first walls 2311 and multiple second walls 2312 are arranged at an angle and alternately, and together they abut against the anti-expansion beam 30. This structure, by giving the inner wall of the stress groove 231 a stepped, sawtooth, or zigzag geometric shape, provides a larger effective contact area when the cell 71 expands and generates lateral compressive force, compared to a flat wall design. This effectively disperses and transmits the compressive force to the anti-expansion beam 30. Furthermore, since there is an angle between the first wall 2311 and the second wall 2312, this change in deformation path can guide the expansion stress to be released in different directions, thereby reducing the formation of localized stress concentration and preventing localized deformation or failure of the structure due to expansion. Therefore, by employing a structure with alternating angled first walls 2311 and second walls 2312, this application enables the stress groove 231 to have better deformation coordination and stress distribution capabilities, thereby improving the structural strength and anti-expansion stability of the battery pack under extreme conditions such as high-rate charging and discharging.

[0036] Optionally, see Figure 4 and Figure 5 The battery pack housing includes bolts 50, an anti-expansion beam 30 with a first hole 31, a connecting part 23 with a second hole 232, the second hole 232 and the stress groove 231 are connected, the bolt head of the bolt 50 is located on the side of the first hole 31 away from the connecting part 23, and the bolt shank of the bolt 50 passes through the first hole 31 and the second hole 232 in sequence and is connected to the connecting part 23.

[0037] In practical applications, the anti-expansion beam 30 connects to the second hole 232 on the connecting part 23 via the first hole 31, and is connected by bolts 50, achieving a detachable fixed connection between the anti-expansion beam 30, the connecting part 23, and the second end plate 22. This structural design allows the bolt 50 to pass sequentially through the anti-expansion beam 30 and the connecting part 23, with the bolt head positioned on the side of the anti-expansion beam 30 away from the connecting part 23, ensuring convenient installation and a stable connection. The limiting fit between the stress groove 231 and the anti-expansion beam 30 effectively alleviates localized stress concentration caused by preload and internal / external loads during use, reducing the risk of fatigue damage to the connecting part 23. Furthermore, this structure allows the battery pack housing to buffer some stress through slight displacement when subjected to the expansion of the battery cell 71, avoiding cracks and failures caused by rigid connections, thereby improving overall anti-expansion performance and structural stability. Therefore, this technical solution effectively solves the problems of insufficient stability in the anti-expansion beam connection and easy damage due to stress concentration in existing technologies, achieving a more reliable structural connection and a longer service life for the battery pack.

[0038] Further, see Figure 3 and Figure 5The expansion beam 30 has an installation groove 32, which is connected to the first hole 31, and the bolt head of the bolt 50 is located inside the installation groove 32.

[0039] In practical applications, the anti-expansion beam 30 is provided with a mounting groove 32, which communicates with the first hole 31, and the bolt head of the bolt 50 is located inside the mounting groove 32. This design allows the mounting groove 32 to accommodate the bolt head, avoiding interference or collision problems caused by the bolt head protruding outside the anti-expansion beam 30, and reducing potential impact on the cell assembly 70 and other internal structures of the enclosure. Furthermore, the mounting groove 32 facilitates the insertion of the bolt 50 into the first hole 31 and the second hole 232 by operators. This structure not only facilitates the installation and maintenance of the bolt 50 but also reduces space occupation, contributing to the compact design of the battery pack enclosure structure. Therefore, this technical solution effectively solves the interference and space waste problems caused by the exposed bolt head in traditional connection methods, achieving a safe, reliable, and space-saving connection structure.

[0040] Furthermore, if the stress groove 231 is stepped and no mounting groove 32 is provided, the first hole 31 needs to penetrate the anti-expansion beam 30. Since the thickness of the anti-expansion beam 30 varies at different locations, the depth of the first hole 31 will differ, leading to variations in the length of the bolts 50 at different locations, increasing the complexity of the bolt specifications and the difficulty of assembly. By creating a mounting groove 32 on the anti-expansion beam 30, and ensuring that the wall thickness of the mounting groove 32 near the connecting part 23 remains consistent, the first hole 31 penetrates the sidewall of the mounting groove 32 near the connecting part 23, thus connecting the mounting groove 32 to the second hole 232 through the first hole 31. This unifies the depth of the first hole 31 at different locations, ensuring consistent bolt lengths at different locations, simplifying the bolt specifications, and improving assembly efficiency. In addition, the mounting groove 32 can also cover the bolt head, reducing spatial interference caused by exposed bolt heads, further improving the compactness and safety of the structure. This design effectively solves the problems of inconsistent bolt lengths and low space utilization in traditional designs.

[0041] Optionally, refer to Figure 3 The frame 20 includes a reinforcing part 24, which is disposed on the side of the connecting part 23 away from the receiving cavity 40. The reinforcing part 24 is connected to the connecting part 23 and to the second end plate 22.

[0042] In practical applications, a reinforcing part 24 is provided and connected to the side of the connecting part 23 away from the receiving cavity 40, and connected to the second end plate 22. This allows the reinforcing part 24 to provide effective counter-support to the connecting part 23 structurally when the battery cell 71 in the receiving cavity 40 expands due to heat during use and transmits compressive force to the connecting part 23 through the anti-expansion beam. This enhances the structural stability of the connecting part 23 when subjected to thrust from the receiving cavity 40 and prevents the connecting part 23 from deforming or being damaged due to local stress concentration.

[0043] Furthermore, referring to Figure 3 and Figure 5 The reinforcing part 24 includes an adjacent third wall 241 and a fourth wall 242. The third wall 241 is attached to and connected to the connecting part 23 and the second end plate 22 respectively. The fourth wall 242 is arc-shaped, with one end tangent to the side wall of the connecting part 23 and the other end tangent to the side wall of the second end plate 22.

[0044] In practical applications, the fourth wall 242 is designed as an arc-shaped structure, with one end tangent to the side wall of the connecting part 23 and the other end tangent to the side wall of the second end plate 22. This allows the local stress caused by the cell 71 pushing the anti-expansion beam 30 away from the receiving cavity 40 during the thermal expansion of the cell 71 to gradually transition along the arc path to other connecting walls of the reinforcing part 24, thereby avoiding stress concentration problems caused by sharp corner structures. The arc structure can distribute the local concentrated load to a larger wall area, effectively reducing stress concentration at the junction of the connecting part 23, the second end plate 22, and the anti-expansion beam 30, improving the fatigue resistance and structural reliability of this structural area, and is especially suitable for battery system environments subjected to cyclic expansion loads. This structural design helps to optimize the stress distribution path while ensuring strength and rigidity, improving the stability of the overall box structure under the action of lateral forces caused by thermal expansion.

[0045] In other embodiments of this application, the reinforcing part 24 may protrude from the connecting part 23 and abut against the anti-expansion beam 30, so that part of the reinforcing part 24 and the anti-expansion beam 30 are in contact, so that the stress of the anti-expansion beam 30 is dispersed in the reinforcing part 24, thereby further reducing the stress concentration phenomenon of the anti-expansion beam 30.

[0046] In one embodiment, reference is made to Figure 4 and Figure 6 The battery pack housing includes a liquid cooling plate 60, which includes a flow guide 61 and a cooling section 62. The flow guide 61 has a liquid inlet 611 and a liquid outlet 612. The cooling section 62 has flow channels inside, which are connected to the liquid inlet 611 and the liquid outlet 612 respectively. The cooling section 62 is connected to the frame 20 and closes the opening on one side of the receiving cavity 40. The anti-expansion beam 30 has a relief groove 33, and the flow guide 61 passes through the relief groove 33.

[0047] In practical applications, by opening a relief groove 33 on the anti-expansion beam 30 and allowing the flow guide 61 to pass through the relief groove 33 without exceeding the opening of the relief groove 33 along the height direction of the battery pack box, the spatial coordination between the flow guide 61 and the anti-expansion beam 30 is ensured, structural interference is avoided, and the liquid cooling plate 60 can be smoothly arranged in the frame 20 structure, ensuring the stability of system installation.

[0048] In addition, the liquid cooling plate 60 integrates cooling and structural sealing functions, which helps to reduce the number of parts and assembly difficulty, and improve the overall compactness and system integration of the battery pack.

[0049] Secondly, this utility model provides a battery pack, referring to... Figure 7 and Figure 8 The battery pack includes a battery cell assembly 70 and a battery pack housing. The battery cell assembly 70 includes multiple battery cells 71 and a first pretensioner 72. The first pretensioner 72 is disposed between the multiple battery cells 71 and is elastic. An anti-expansion beam 30 and a first end plate 21 are sandwiched on opposite sides of the battery cell assembly 70, and the first pretensioner 72 is in a deformed state.

[0050] In practical applications, by clamping the anti-expansion beam 30 and the first end plate 21 to opposite sides of the cell assembly 70, and by placing an elastic first pre-tightening member 72 between multiple cells 71 in a deformed state, the cell assembly 70 is in a state of overall compression after assembly. Specifically, the first pre-tightening member 72 provides continuous pre-pressure under initial deformation, which can counteract the dimensional changes caused by the expansion of the cells 71 during subsequent charging and discharging, preventing the cell assembly 70 from loosening and improving assembly stability. At the same time, the clamping structure of the anti-expansion beam 30 and the first end plate 21 forms a stable boundary limiting frame 20, which can limit the radial or lateral dimensional expansion of the cell assembly 70, further enhancing structural strength and anti-expansion capability. In addition, by placing the first pre-tightening member 72 between the cells 71 rather than on both sides, a more uniform distribution of clamping force can be achieved, which helps to avoid insufficient or excessive pressure on individual cells 71, improving the lifespan consistency and safety of the entire cell assembly 71.

[0051] In this embodiment, the first pre-tightening member 72 is foam, and there are multiple of them. A first pre-tightening member 72 is provided between every two adjacent battery cells 71.

[0052] In one embodiment, reference is made to Figure 7 and Figure 8 The battery cell assembly 70 includes an insulating sheet 74 and a second pre-tightening member 73. The insulating sheet 74 is disposed between the first end plate 21 and the adjacent battery cell 71 or between the anti-expansion beam 30 and the adjacent battery cell 71. The second pre-tightening member 73 is disposed between the insulating sheet 74 and the adjacent battery cell 71.

[0053] In practical applications, placing the insulating sheet 74 between the first end plate 21 and the adjacent cell 71, or between the anti-expansion beam 30 and the adjacent cell 71, can prevent electrical breakdown or creepage between the high-voltage cell 71 and the metal structural components, while isolating potential local thermal stress or mechanical interference, thus enhancing the electrical safety and structural stability of the system. Furthermore, adding a second pre-tightening member 73 between the insulating sheet 74 and the cell 71 helps apply uniform and stable pressure to the surface of the cell 71, making the insulating sheet 74 fit more tightly and preventing displacement or warping under vibration or thermal expansion and contraction conditions that could affect insulation performance. This maintains good electrical isolation while also buffering and stabilizing the cell assembly 70, improving the overall reliability and safety of the battery pack in various scenarios.

[0054] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0055] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0056] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0057] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery pack housing, characterized in that, include: A frame, the frame including a first end plate and two second end plates, the two second end plates being disposed opposite to each other, and the first end plate being connected between the two second end plates; An anti-expansion beam is disposed between two second end plates and is detachably connected to the second end plates. A receiving cavity is formed between the anti-expansion beam, the first end plate, and the second end plates. The receiving cavity is used to accommodate the battery cell assembly. The anti-expansion beam and the first end plate are used to clamp the opposite sides of the battery cell assembly.

2. The battery pack housing according to claim 1, characterized in that, The frame includes a connecting part disposed in the receiving cavity and connected to the second end plate. The connecting part has a stress groove, and at least a portion of the anti-expansion beam is limited and engaged with the stress groove. The anti-expansion beam is detachably connected to the second end plate through the connecting part.

3. The battery pack housing according to claim 2, characterized in that, The inner wall of the stress groove includes a plurality of first walls and a plurality of second walls. The first walls and second walls are arranged at an angle, and the first walls and second walls are alternately arranged and adjacent to each other. The first walls and second walls abut against the anti-expansion beam.

4. The battery pack housing according to claim 2, characterized in that, The battery pack housing includes bolts, the anti-expansion beam has a first hole, the connecting part has a second hole, the second hole is connected to the stress groove, and the bolts are sequentially inserted through the first hole and the second hole and connected to the connecting part.

5. The battery pack housing according to claim 4, characterized in that, The anti-expansion beam has an installation groove, which is connected to the first hole, and the bolt head is located inside the installation groove.

6. The battery pack housing according to claim 2, characterized in that, The frame includes a reinforcing part disposed on the side of the connecting part away from the receiving cavity. The reinforcing part is connected to the connecting part and to the second end plate.

7. The battery pack housing according to claim 6, characterized in that, The reinforcing part includes an adjacent third wall and a fourth wall. The third wall is attached to and connected to the connecting part and the second end plate, respectively. The fourth wall is arc-shaped, with one end tangent to the side wall of the connecting part and the other end tangent to the side wall of the second end plate.

8. The battery pack housing according to claim 6, characterized in that, The reinforcing part protrudes from the connecting part and abuts against the anti-expansion beam.

9. The battery pack housing according to any one of claims 1-8, characterized in that, The battery pack housing includes a liquid cooling plate, which includes a flow guiding section and a cooling section. The flow guiding section has a liquid inlet and a liquid outlet. The cooling section has a flow channel inside, which is connected to the liquid inlet and the liquid outlet respectively. The cooling section is connected to the frame and closes the opening on one side of the receiving cavity. The anti-expansion beam has a relief groove, and the flow guide is inserted into the relief groove.

10. A battery pack, characterized in that, include: The cell assembly and the battery pack housing as described in any one of claims 1-8, wherein the cell assembly includes a plurality of cells and a first pretensioner, the first pretensioner being disposed between the plurality of cells, the first pretensioner being elastic, the anti-expansion beam and the first end plate being clamped on opposite sides of the cell assembly, and the first pretensioner being in a deformed state.

11. The battery pack according to claim 10, characterized in that, The battery cell assembly includes an insulating sheet, which is disposed between the first end plate and the adjacent battery cell and / or between the anti-expansion beam and the adjacent battery cell; The cell assembly also includes a second pre-tightening member disposed between the insulating sheet and the adjacent cell.

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