CTP battery PACK lower box body with busbar welded on side surface

Abstract

The utility model discloses a CTP battery PACK lower box body with a side surface welded with busbars, which comprises a front frame, a rear frame, a left frame, a right frame and a bottom composite plate, the front frame, the rear frame, the left frame and the right frame are connected to the periphery of the bottom composite plate to form a box body frame, a plurality of internal end plates are connected in the box body frame, and the internal end plates are connected with the busbars. The inner end plate is parallel to the front frame and divides the inside of the box body frame into a plurality of cell stacking areas, the left frame and the right frame are provided with windows corresponding to the cell stacking areas, the left frame and the right frame are connected with frame cover plates for sealing the windows, and the left frame and the right frame are vertically provided with a plurality of vertically through round holes on the outer sides of the frame cover plates. According to the utility model, the side welding of the busbar and the sampling circuit can be carried out after the battery cell enters the box, and the contradiction between the battery PACK production process and the mechanical property is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery PACK, and in particular relates to a CTP battery PACK lower box body with a side-welded busbar. Background Art

[0002] Currently, CTP (module-free battery pack) has become the mainstream of power batteries. Because the battery cell tabs have two types of top and end surfaces, the busbars of the battery cells in the battery pack are either top-welded or side-welded.

[0003] In the prior art, the box body mainly comprises a pentahedral box body and a box cover, such as Figure 1 The box disclosed in utility model 202321414843.7 is characterized by high strength, good protection for the battery cells, and support for top welding. However, it cannot be used for side welding of module busbars. Modules welded from the side must be welded before being placed in the box, which is a difficult process.

[0004] Figure 2 The figure shows a tray-type lower box design with side welding. This box can support the welding of the busbar after the battery cells are placed in the box. The design feature is that the structural strength is concentrated on the tray, which is conducive to lightweighting. However, the PACK shell has weak protection on the sides, and the overall mechanical strength of the box is not enough to meet application scenarios with more demanding working conditions. Utility Model Content

[0005] The purpose of the utility model is to provide a CTP battery PACK lower box with a side-welded busbar, which can perform side welding of the busbar and the sampling circuit after the battery cells are placed in the box, thereby resolving the contradiction between the battery PACK production process and mechanical performance.

[0006] To achieve the above-mentioned purpose, the lower box body of the CTP battery PACK with a side-welded busbar of the present invention includes a front frame, a rear frame, a left frame, a right frame and a bottom composite plate. The front frame, the rear frame, the left frame and the right frame are connected to the periphery of the bottom composite plate to form a box frame. Several internal end plates are connected to the box frame. The internal end plates are parallel to the front frame and divide the box frame into several battery cell stacking areas. Windows are provided on the left and right frames corresponding to the battery cell stacking areas. The left and right frames are connected to a frame cover plate that seals the window. The left and right frames are vertically provided with several circular holes that pass through from top to bottom on the outside of the frame cover plate.

[0007] As a further solution of the present invention: the bottom composite plate includes a bottom guard plate and a liquid cooling plate, the liquid cooling plate is located above the bottom guard plate, and the liquid cooling plate and the bottom guard plate are bonded by adhesive.

[0008] As a further solution of the present invention: the liquid cooling plate is connected to the left frame and the right frame by welding.

[0009] As a further solution of the present invention: the outermost inner end plates in the box frame are respectively fitted with the front frame and the rear frame, and the inner end plates are welded or screwed to the left frame and the right frame.

[0010] As a further solution of the present invention: a sealing ring for sealing the window is provided on the frame cover.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] The window design on the left and right frames allows for side welding of the battery cells after they are placed in the box, enabling production on ordinary mass production lines, reducing investment and costs.

[0013] The front frame, rear frame, left frame, and right frame cooperate with the bottom composite board to form the box frame. Combined with the internal end plates, they can improve the overall structural strength and solve the contradiction between the battery pack production process and mechanical performance.

[0014] In addition, the side-welded PACK is also convenient for fault inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the box disclosed in utility model 202321414843.7.

[0016] Figure 2 It is a tray-type lower box design with side welding.

[0017] Figure 3 It is a structural schematic diagram of the lower box of a CTP battery pack with a side-welded busbar according to the present invention.

[0018] Figure 4 It is a partial structural diagram of the lower box of the CTP battery PACK with side-welded busbars of the present invention.

[0019] In the figure: 1, front frame, 2, CTP battery, 3, left frame, 4, round hole, 5, window, 6, bottom composite plate, 7, rear frame, 8, frame cover, 9, inner end plate, 10, sealing ring, 11, right frame;

[0020] 6.1. Bottom guard plate, 6.2. Liquid cooling plate. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figure 3As shown, the lower box of the CTP battery PACK with a side-welded busbar includes a front frame 1, a rear frame 7, a left frame 3, a right frame 11 and a bottom composite plate 6. The front frame 1, the rear frame 7, the left frame 3 and the right frame 11 are connected to the periphery of the bottom composite plate 6 to form a box frame. A number of internal end plates 9 are connected to the box frame. The internal end plates 9 are parallel to the front frame 1 and divide the box frame into a number of battery cell stacking areas. Windows 5 are provided on the left frame 3 and the right frame 11 corresponding to the battery cell stacking areas. A frame cover 8 that seals the window 5 is connected to the left frame 3 and the right frame 11. A number of circular holes 4 that pass through the left frame 3 and the right frame 11 are vertically provided on the outside of the frame cover 8.

[0023] The front frame 1, rear frame 7, left frame 3, and right frame 11 can be made of high-strength aluminum profiles or high-strength steel sheet metal stampings, and square steel can also be used to ensure structural strength while maintaining a hollow structure, which can reduce the overall weight of the structure; using the circular holes 4 set on the left frame 3 and the right frame 11, when installing the battery pack, use bolts to penetrate from top to bottom, and then screw in the nuts set on the vehicle to fix it.

[0024] Further, such as Figure 3 and Figure 4 As shown, the bottom composite plate 6 includes a bottom guard plate 6.1 and a liquid cooling plate 6.2. The liquid cooling plate 6.2 is located above the bottom guard plate 6.1 and is bonded to the bottom guard plate 6.1 by adhesive. The liquid cooling plate 6.2 is made of aluminum profile plate or stamping plate to ensure the overall support strength of the bottom composite plate 6.

[0025] Furthermore, the liquid cooling plate 6.2 is connected to the left frame 3 and the right frame 11 by welding, so that the box frame forms a stable overall structure.

[0026] In order to make the internal structure of the box frame more stable, the outermost internal end plates 9 in the box frame are respectively attached to the front frame 1 and the rear frame 7, and the internal end plates 9 are welded or screwed to the left frame 3 and the right frame 11, which can improve the structural strength of the front frame 1 and the rear frame 7. At the same time, the connection between the internal end plates 9 and the left frame 3 and the right frame 11 can make them form a whole with the box frame.

[0027] After the side welding of the busbars of the CPT battery cells is completed, they are encapsulated by a frame cover 8. To ensure the sealing effect, the frame cover 8 is further provided with a sealing ring 10 to seal the window 5. The frame cover 8 is made of aluminum plate or stamped steel plate and is fixed by bolts.

[0028] In actual use, the number of battery cells placed in the box frame is different, and the internal height of the box frame exceeds the height of the battery cells, so multiple layers of battery cells can be stacked as needed.

Claims

1. A CTP battery pack lower box with a side-welded busbar, comprising a front frame (1), a rear frame (7), a left frame (3), a right frame (11) and a bottom composite plate (6), wherein the front frame (1), the rear frame (7), the left frame (3) and the right frame (11) are connected to the periphery of the bottom composite plate (6) to form a box frame, characterized in that: A plurality of internal end plates (9) are connected to the box frame, and the internal end plates (9) are parallel to the front frame (1) and divide the box frame into a plurality of battery cell stacking areas. Windows (5) are provided on the left frame (3) and the right frame (11) corresponding to the battery cell stacking areas. A frame cover (8) sealing the window (5) is connected to the left frame (3) and the right frame (11). A plurality of vertically extending circular holes (4) are provided on the left frame (3) and the right frame (11) on the outer side of the frame cover (8).

2. The CTP battery PACK lower box with side-welded busbars according to claim 1, characterized in that: The bottom composite plate (6) comprises a bottom guard plate (6.1) and a liquid cooling plate (6.2); the liquid cooling plate (6.2) is located above the bottom guard plate (6.1); and the liquid cooling plate (6.2) and the bottom guard plate (6.1) are bonded together by adhesive.

3. The CTP battery PACK lower box with side-welded busbars according to claim 2, characterized in that: The liquid cooling plate (6.2) is connected to the left frame (3) and the right frame (11) by welding.

4. The CTP battery PACK lower box with side-welded busbars according to claim 1 or 2, characterized in that: The outermost inner end plate (9) in the box frame is respectively fitted with the front frame (1) and the rear frame (7), and the inner end plate (9) is welded or screwed to the left frame (3) and the right frame (11).

5. The CTP battery PACK lower box with side-welded busbars according to claim 1 or 2, characterized in that: The frame cover plate (8) is provided with a sealing ring (10) for sealing the window (5).

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