A battery pack housing

Abstract

This invention provides a battery pack housing, comprising a base plate, a surrounding plate, a cover plate, and a buffer plate. The inner wall of the base plate is connected to several raised limiting strips, which are arranged parallel to each other. At least some adjacent limiting strips form mounting slots, and the upper side of each limiting strip has several connecting screw holes. Several raised support strips connected to the inner side of the base plate are also provided within the mounting slots, with the upper side of each support strip forming a support surface. At least two support strips are spaced apart within each mounting slot. The buffer plate overlaps the support strips and mates with the support surface, with its end abutting against the limiting surface. In use, the battery cell assembly can be fixedly connected to the limiting strips via the connecting screw holes, achieving a high-strength connection between the battery cell assembly and the housing. Furthermore, a buffer space is formed between the buffer plate and the base plate, reducing deformation and compression of the battery cell assembly and improving its impact resistance.

Description

Technical Field

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

[0002] Because of the complex working environment, the design of power batteries needs to consider many factors such as vibration, impact, collision, and thermal management. Various extreme working conditions can affect the normal use of power batteries. At best, the power battery will malfunction; at worst, it will explode or burn, endangering life and property. The battery pack enclosure used to encapsulate the battery cells plays a crucial role in ensuring the safety of the power battery.

[0003] In existing technologies, battery cell assemblies are generally fixed to the base plate of the battery pack housing using adhesive materials. For example, patent application CN201910748287.9 ​​discloses a battery pack housing comprising the housing and multiple batteries housed within it, wherein the batteries and the inner wall of the housing are bonded together using adhesive. In the above technical solutions, the strength of the adhesive structure between the battery cell assembly and the battery pack housing is limited, and the high temperatures generated during battery operation can easily affect the lifespan of the adhesive structure. Some existing technologies use bolts and screws to fix the battery cell assembly to the battery pack housing. In this approach, when the battery is subjected to impact, the battery cell assembly experiences direct stress, making it prone to failure under extreme conditions. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a battery pack housing that offers high stability for the battery cell assembly and reduces the failure rate of the battery cell assembly when the housing is subjected to impact.

[0005] The present invention adopts the following technical solution:

[0006] A battery pack housing includes a base plate, an annular surrounding plate connected to the four edges of the base plate, a cover plate detachably connected to the upper end of the surrounding plate, and a buffer plate disposed on the inner side of the base plate. The inner wall of the base plate is connected to a plurality of protruding limiting strips, which are arranged parallel to each other. At least a portion of adjacent limiting strips form mounting slots. The side of each limiting strip facing the mounting slot forms a limiting surface, and the upper side of each limiting strip has a plurality of connecting screw holes. The mounting slot also contains a plurality of protruding support strips connected to the inner surface of the base plate. The protrusion height of each support strip is less than that of the limiting strips, and the upper side of each support strip forms a support surface parallel to the inner surface of the base plate. Each mounting slot contains at least two support strips spaced apart. The buffer plate overlaps the support strips and mates with the support surface, with the end of the buffer plate abutting against the limiting surface.

[0007] Furthermore, each of the buffer plates overlaps above at least two of the support bars.

[0008] Furthermore, the length direction of the support strip is perpendicular to the length direction of the limiting strip.

[0009] Furthermore, the side of the limiting strip facing the mounting slot forms a notch that is recessed relative to the limiting surface.

[0010] Furthermore, the enclosure includes two protective side plates and two protective end plates arranged opposite to each other, the edges of the protective side plates are perpendicularly connected to the edges of the protective end plates, at least one of the end plates is provided with a wiring hole, and the outer surface of the protective side plates is connected with a mounting lug.

[0011] Furthermore, the length direction of the limiting strip is perpendicular to the protective side plate, and both ends of the limiting strip are connected to the inner wall of the protective side plate; in the width direction of the limiting strip, there is a gap between the limiting strip located at the edge and the adjacent protective end plate.

[0012] Furthermore, the base plate includes an upper plate layer, a lower plate layer, and a frame. The upper and lower sides of the frame are respectively sealed to the upper plate layer and the lower plate layer. An inner cavity is formed between the upper plate layer and the lower plate layer, which is constrained by the frame. The frame is provided with a coolant inlet and a coolant outlet communicating with the inner cavity.

[0013] Furthermore, the base plate also includes a first flow guide baffle, the upper and lower sides of which are connected to the upper plate layer and the lower plate layer, respectively; the frame includes a front end wall and a rear end wall disposed opposite to each other, and a first flow channel is formed between the first end of the first flow guide baffle and the second end of the first flow guide baffle and the rear end wall.

[0014] Furthermore, the base plate also includes a second flow guide baffle parallel to the first flow guide baffle, the upper side and the lower side of the second flow guide baffle being connected to the upper plate layer and the lower plate layer respectively; a second flow guide port is formed between the first end of the second flow guide baffle and the front end wall, and the second end is connected to the rear end wall; the first flow guide baffle and the second flow guide baffle are alternately arranged.

[0015] Furthermore, the base plate also includes several diversion baffles parallel to the first flow guide baffle. The upper and lower sides of the diversion baffles are connected to the upper plate layer and the lower plate layer, respectively. A gap is left between both ends of the diversion baffles and the front end wall and the rear end wall.

[0016] The following beneficial effects can be achieved by applying this utility model:

[0017] 1. In use, the battery cell assembly can be positioned through the mounting slots between the limiting clips and fixedly connected to the limiting clips through the connecting screw holes, thereby achieving a high-strength connection between the battery cell assembly and the housing. Furthermore, the positioning slots are equipped with support strips and buffer plates, and a buffer space is formed between the buffer plate and the bottom plate. When the battery pack housing is impacted, this buffer space can withstand a certain deformation, reducing the deformation and compression of the battery cell assembly and improving the impact resistance of the power battery.

[0018] 2. In some embodiments of this utility model, the base plate includes an upper plate layer located on the inner side and a lower plate layer located on the outer side. When the base plate is impacted, the inner cavity between the upper plate layer and the lower plate layer can withstand a certain impact deformation, reducing the impact on the battery cell assembly. At the same time, the inner cavity can also be used as a coolant flow channel to reduce the battery temperature.

[0019] 3. In some embodiments of this utility model, a flow guide baffle and a flow divider are provided between the upper plate layer and the lower plate layer. The flow guide baffle and the flow divider serve to improve the cooling efficiency on the one hand, and support the upper plate layer and the lower plate layer on the other hand, and improve the structural strength of the bottom plate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the transverse cross-section of the base plate;

[0022] Figure 3 This is a schematic diagram of the vertical cross-section of the base plate;

[0023] In the diagram, 1-bottom plate, 11-upper plate, 12-lower plate, 13-frame, 131-front end wall, 132-rear end wall, 14-inner cavity, 15-coolant inlet, 16-coolant outlet, 17-first flow guide baffle, 171-first flow channel opening, 18-second flow guide baffle, 181-second flow channel opening, 19-diverter baffle, 2-enclosing plate, 21-protective side plate, 22-protective end plate, 23-mounting lug, 3-cover plate, 4-buffer plate, 41-support surface, 5-limiting clip, 51-connecting screw hole, 52-limiting surface, 53-notch, 6-support strip. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example

[0025] Reference Figures 1-3 One embodiment of this utility model provides a battery pack housing, which includes a base plate 1, a surrounding plate 2, a cover plate 3, several buffer plates 4, several limiting strips 5, and several support strips 6. Specifically:

[0026] The base plate 1 includes an upper plate layer 11 near the inner side of the housing, a lower plate layer 12 near the outer side of the housing, and a frame 13. The upper and lower sides of the frame 13 are respectively sealed to the edges of the upper plate layer 11 and the lower plate layer 12, forming an inner cavity 14 constrained by the frame 13 between the upper plate layer 11 and the lower plate layer 12. The frame 13 has an approximately rectangular structure, with its two short sides forming a front wall 131 and a rear wall 132, respectively. A coolant inlet 15 and a coolant outlet 16 are provided on the front wall, through which coolant flows to the lower plate layer 12. The introduction and extraction of coolant into the inner cavity 14 can achieve a cooling effect on the base plate. In a further embodiment, the base plate 1 also includes a first flow guide baffle 17, a second flow guide baffle 18, and a flow splitter baffle 19. The length direction of the first flow guide baffle 17 is perpendicular to the front end wall 131 and the rear end wall 132. The upper and lower sides of the first flow guide baffle 17 are connected to the upper plate layer 11 and the lower plate layer 12, respectively. The first end of the first flow guide baffle 17 is connected to the front end wall 131, and the second end is connected to the rear end wall 132 to form a first flow guide. The coolant flows in opposite directions through the outlet 171 and the first guide baffle 17. A second guide baffle 18 is arranged parallel to the first guide baffle 17. The upper and lower sides of the second guide baffle 18 are connected to the upper plate layer 11 and the lower plate layer 12, respectively. A second guide port 182 is formed between the first end of the second guide baffle 18 and the front end wall 131, and the second end is connected to the rear end wall 132. The coolant flows in opposite directions through the second guide baffle 18. The first guide baffle 17 and the second guide baffle 18 are spaced apart to allow the coolant to flow in opposite directions. The extended flow path of the coolant within the inner cavity enhances heat exchange. Typically, the number of first guide plates 17 is one more than the number of second guide plates 18, placing the coolant inlet 15 and coolant outlet 16 on the same side for easy coolant access. Furthermore, several flow dividers 19 can be installed between the first guide plate 17 and the frame 13, and between the first guide plate 17 and the second guide plate 18. These flow dividers 19 divide a general flow channel into several parallel branch channels, thereby reducing coolant backflow and eddy currents. In addition to improving cooling and heat exchange, the aforementioned first guide plate 17, second guide plate 18, and flow dividers 19 also support the upper plate layer 11 and the lower plate layer 12, increasing the structural strength of the base plate 1.

[0027] The enclosure 2 is roughly a rectangular frame structure. The enclosure 2 includes two protective side plates 21 and two protective end plates 22 arranged opposite to each other. The protective side plates 21 are perpendicularly connected to the long side of the base plate 1, and the protective end plates 22 are perpendicularly connected to the short side of the base plate 1. Mounting lugs 23 are connected to the outside of the protective side plates. The mounting lugs 23 are used to fix the battery box to other structures. One of the protective end plates 22 is provided with a wiring hole.

[0028] The cover plate 3 and the upper edge of the enclosure 2 are detachably connected. For example, the cover plate 3 can be connected to the enclosure 2 by screws or bolts. In some embodiments, the edge of the cover plate 3 can also be hinged to the enclosure to form a flip-top structure.

[0029] The limiting strip 5 is fixedly connected to the upper plate layer 11 of the base plate 1. The length direction of the limiting strip 5 is perpendicular to the long side of the base plate 1, and the two ends of the limiting strip 5 abut against the inner side surfaces of the two protective side plates 21 of the surrounding plate 2, thereby improving the structural strength of the protective side plates. Several limiting strips 5 are spaced apart, with each pair of limiting strips 5 forming a group. Between the two limiting strips 5 in each group, an installation groove is formed that matches the bottom of the battery cell assembly. A connecting screw hole 51 is provided on the upper side of the limiting strip 5. A limiting surface 52 and a recess 53 that are recessed relative to the limiting surface 52 are provided on the side of the limiting strip facing the installation groove. A gap is left between the limiting strip 5 located at the edge and the adjacent protective end plate 22.

[0030] The support strip 6 is set in the mounting slot and is perpendicular to the limiting strip 5. The support strip 6 is fixedly connected to the upper plate layer 11. The protrusion height of the support strip 6 relative to the upper plate layer 11 is less than that of the limiting strip 6. At least two limiting strips 6 are provided in each mounting slot, and the upper side of the limiting strip forms a support surface.

[0031] The buffer plate 4 is set in the mounting slot and overlaps the support surface of the support bar 6. Each buffer plate 4 is supported by at least two support bars 6. The support bars 6 are preferably set near the edge of the buffer plate 4. Under the support of the support bars 6, a buffer space that can withstand a certain deformation is formed between the buffer plate 4 and the base plate 1. Each end of the buffer plate 4 abuts against the limiting surface 51 of a limiting strip 5. The notch 53 provides a control point for the installation and removal of the buffer plate 4.

[0032] In this embodiment, the battery cell assembly can be positioned through the mounting slots between the limiting clips 5 and fixedly connected to the limiting clips 5 through the connecting screw holes 51, achieving a high-strength connection between the battery cell assembly and the housing. Furthermore, the positioning slots are equipped with support bars 6 and buffer plates 4, forming a buffer space between the buffer plate 4 and the bottom plate 1. When the battery pack housing is impacted, this buffer space can withstand a certain amount of deformation, reducing the deformation and compression of the battery cell assembly and improving the impact resistance of the power battery. In addition, the bottom plate 1 has a double-layer structure. When the lower plate layer 12 is impacted, the upper plate layer 11 experiences less deformation, which is beneficial for protecting the battery cell assembly.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery pack housing, characterized in that: The system includes a base plate (1), an annular surrounding plate (2) connected to the four edges of the base plate (1), a cover plate (3) detachably connected to the upper end of the surrounding plate (2), and a buffer plate (4) disposed on the inner side of the base plate (1). The inner wall of the base plate (1) is connected to several protruding limiting strips (5), which are arranged parallel to each other. At least some adjacent limiting strips (5) form mounting slots. The side of the limiting strip (5) facing the mounting slot forms a limiting surface (52). The upper side of the limiting strip is provided with several... Dry connection screw hole (51); the mounting slot is also provided with a number of raised support strips (6) connected to the inner side of the base plate (1), the protrusion height of the support strip (6) is less than the limiting strip (5), the upper side of the support strip (6) forms a support surface parallel to the inner side of the base plate (1), and at least two support strips (6) are provided in each mounting slot at intervals; the buffer plate (4) overlaps the support strip (6) and cooperates with the support surface (61), and the end of the buffer plate (4) abuts against the limiting surface (52).

2. The battery pack enclosure of claim 1, wherein: Each of the buffer plates (4) overlaps above at least two of the support bars (6).

3. The battery pack enclosure of claim 1, wherein: The length direction of the support bar (6) is perpendicular to the length direction of the limiting strip (5).

4. The battery pack enclosure of claim 1, wherein: The limiting strip (5) has a notch (53) formed on the side facing the mounting slot, which is recessed relative to the limiting surface.

5. The battery pack enclosure of claim 1, wherein: The enclosure (2) includes two protective side plates (21) and two protective end plates (22) arranged opposite to each other. The edges of the protective side plates are perpendicularly connected to the edges of the protective end plates. At least one of the end plates is provided with a wiring hole. The outer side of the protective side plate is connected with a mounting lug (23).

6. The battery pack enclosure of claim 5, wherein: The length direction of the limiting strip (5) is perpendicular to the protective side plate (21), and both ends of the limiting strip (5) are connected to the inner wall of the protective side plate (21); in the width direction of the limiting strip, there is a gap between the limiting strip (5) located at the edge and the adjacent protective end plate (22).

7. The battery pack enclosure of claim 1, wherein: The base plate (1) includes an upper plate layer (11), a lower plate layer (12) and a frame (13). The upper and lower sides of the frame are respectively sealed to the upper plate layer and the lower plate layer. An inner cavity (14) is formed between the upper plate layer and the lower plate layer, which is restricted by the frame. The frame is provided with a coolant inlet (15) and a coolant outlet (16) communicating with the inner cavity.

8. The battery pack enclosure of claim 7, wherein: The base plate also includes a first flow guide baffle (17), the upper side and the lower side of the first flow guide baffle are connected to the upper plate layer (11) and the lower plate layer (12) respectively; the frame (13) includes a front end wall (131) and a rear end wall (132) arranged opposite to each other, the first end of the first flow guide baffle (17) is connected to the front end wall (131), and the second end forms a first flow channel (171) between it and the rear end wall (132).

9. The battery pack enclosure of claim 8, wherein: The base plate also includes a second flow guide baffle (18) parallel to the first flow guide baffle (17). The upper and lower sides of the second flow guide baffle are connected to the upper plate layer (11) and the lower plate layer (12) respectively. A second flow guide port (181) is formed between the first end of the second flow guide baffle (18) and the front end wall (131), and the second end is connected to the rear end wall (132). The first flow guide baffle (17) and the second flow guide baffle (18) are alternately arranged.

10. The battery pack enclosure of claim 8, wherein: The base plate also includes several diversion baffles (19) parallel to the first flow guide baffle (17). The upper and lower sides of the diversion baffles are connected to the upper plate layer (11) and the lower plate layer (12) respectively. There is a gap between the two ends of the diversion baffles and the front end wall (131) and the rear end wall (132).

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