Leakage-proof lithium iron phosphate battery pack

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a leakage-proof lithium iron phosphate battery pack which comprises a battery shell and a shell upper cover, an opening is formed in the top of the battery shell, a plurality of lithium iron phosphate batteries are mounted in the battery shell, a rectangular sealing groove is formed in the top of the battery shell around the opening, and a plurality of lithium iron phosphate batteries are mounted in the rectangular sealing groove. An elastic sealing gasket is fixed at the bottom of the shell upper cover, the shape of the elastic sealing gasket is matched with that of the rectangular sealing groove, and when the shell upper cover is connected with the battery shell, the elastic sealing gasket is in interference fit with the interior of the rectangular sealing groove. A gap between the battery shell and the shell upper cover is eliminated through interference fit of the elastic sealing gasket and the rectangular sealing groove, so that the sealing strength is improved, liquid generated by damage of the lithium iron phosphate battery is prevented from overflowing from the battery shell, and meanwhile, water in the external environment is prevented from entering the battery shell to influence the lithium iron phosphate battery; therefore, the sealing performance of the lithium iron phosphate battery pack is improved, and the problem of liquid leakage is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly relates to a leak-proof lithium iron phosphate battery pack. Background Art

[0002] Lithium iron phosphate batteries use lithium iron phosphate as the positive electrode material and carbon as the negative electrode. Lithium iron phosphate batteries have the advantages of high working voltage, large energy density, long cycle life, good safety performance, small self-discharge rate, and no memory effect. During the charging process, some lithium ions in the lithium iron phosphate escape, are transmitted through the electrolyte to the negative electrode, and are embedded in the negative electrode carbon material; at the same time, electrons are released from the positive electrode and reach the negative electrode through the external circuit to maintain the balance of the chemical reaction. At present, the sealing performance of lithium iron phosphate battery packs is poor. When the lithium iron phosphate battery is damaged, there will be a problem of liquid leakage, and the battery liquid will directly leak out from the battery case, polluting the environment and being highly dangerous. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a leak-proof lithium iron phosphate battery pack to solve the problem of poor sealing performance of existing lithium iron phosphate batteries.

[0004] The purpose of the utility model is achieved by the following technical solutions: A leak-proof lithium iron phosphate battery pack includes a battery case and a case upper cover. The top of the battery case is open. A plurality of lithium iron phosphate batteries are installed in the battery case. A rectangular sealing groove is provided around the opening at the top of the battery case. An elastic sealing pad is fixed to the bottom of the case upper cover. The shape of the elastic sealing pad matches the shape of the rectangular sealing groove. When the case upper cover is connected to the battery case, the elastic sealing pad is in interference fit in the rectangular sealing groove.

[0005] Further, the thickness of the elastic sealing pad in the horizontal direction is less than the width of the rectangular sealing groove in the horizontal direction, and the height of the elastic sealing pad is greater than the depth of the rectangular sealing groove.

[0006] Further, the case upper cover is connected to the battery case by screws, and the screws are located outside the elastic sealing pad.

[0007] Further, a plurality of first mounting side plates are fixed to the side wall of the battery case, and a plurality of second mounting side plates are fixed to the side wall of the case upper cover. The plurality of second mounting side plates correspond to the plurality of first mounting side plates one by one. A threaded hole is provided on the top surface of the first mounting side plate, and a through hole is provided through the second mounting side plate. The tail of the screw passes through the through hole and is fitted in the threaded hole.

[0008] Further, small holes are penetrated through the upper cover of the housing, and the electrical connection protrusions of the lithium iron phosphate battery pass through the small holes. A sealing ring is arranged between the small holes and the electrical connection protrusions.

[0009] Further, the inner hole of the sealing ring is conical, and the inner diameter gradually decreases in the direction away from the battery housing. The maximum inner diameter of the sealing ring is larger than the diameter of the electrical connection protrusion, and the minimum inner diameter of the sealing ring is smaller than the diameter of the electrical connection protrusion.

[0010] Further, viewing windows are penetrated through the bottom of the battery housing directly below each lithium iron phosphate battery. A transparent sealing plate is fixed in the viewing windows, and the top surface of the transparent sealing plate is lower than the inner bottom surface of the battery housing.

[0011] Further, a plurality of transverse grooves and a plurality of longitudinal grooves are formed in the inner bottom surface of the battery housing, and both the transverse grooves and the longitudinal grooves communicate with the viewing windows.

[0012] The beneficial effects of the present utility model are as follows:

[0013] Through the interference fit between the elastic sealing gasket and the rectangular sealing groove, the gap between the battery housing and the upper cover of the housing is eliminated, the sealing strength is improved, the liquid generated by the damage of the lithium iron phosphate battery is prevented from overflowing from the battery housing, and at the same time, the water in the external environment is also prevented from entering the battery housing to affect the lithium iron phosphate battery, thereby improving the sealing performance of the lithium iron phosphate battery pack and effectively solving the problem of liquid leakage. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of a leak-proof lithium iron phosphate battery pack of the present utility model;

[0015] Figure 2 is Figure 1 the enlarged view at A in

[0016] Figure 3 is Figure 1 the enlarged view at B in

[0017] Figure 4 is a top view of the battery housing in the structure of a leak-proof lithium iron phosphate battery pack of the present utility model;

[0018] In the figure, 1 - battery housing, 2 - upper cover of the housing, 3 - lithium iron phosphate battery, 4 - rectangular sealing groove, 5 - screw, 6 - first installation side plate, 7 - second installation side plate, 8 - threaded hole, 9 - through hole, 10 - small hole, 11 - electrical connection protrusion, 12 - sealing ring, 13 - viewing window, 14 - transparent sealing plate, 15 - transverse groove, 16 - longitudinal groove, 17 - elastic sealing gasket. Detailed Embodiments

[0019] The technical solution of the present utility model will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present utility model is not limited to the following description.

[0020] As Figures 1 to 4 shown, a leak-proof lithium iron phosphate battery pack includes a battery housing 1 and a housing upper cover 2. The top of the battery housing 1 is open. A plurality of lithium iron phosphate batteries 3 are installed in the battery housing 1. A rectangular sealing groove 4 is provided around the opening at the top of the battery housing 1. An elastic sealing pad 17 is fixed to the bottom of the housing upper cover 2. The shape of the elastic sealing pad 17 matches the shape of the rectangular sealing groove 4. When the housing upper cover 2 is connected to the battery housing 1, the elastic sealing pad 17 is press-fitted in the rectangular sealing groove 4. When installing the housing upper cover 2, the elastic sealing pad 17 is aligned with the rectangular sealing groove 4, and the elastic sealing pad 17 is inserted into the rectangular sealing groove 4. The elastic sealing pad 17 is deformed by extrusion in the rectangular sealing groove 4 to be press-fitted in the rectangular sealing groove 4. The gap between the battery housing 1 and the housing upper cover 2 is eliminated by the interference fit between the elastic sealing pad 17 and the rectangular sealing groove 4, improving the sealing strength and preventing the liquid generated by the damage of the lithium iron phosphate battery 3 from overflowing from the battery housing 1. At the same time, it also prevents the water in the external environment from entering the battery housing 1 and affecting the lithium iron phosphate battery, thereby improving the sealing performance of the lithium iron phosphate battery pack and effectively solving the problem of liquid leakage.

[0021] Furthermore, as Figure 1 and Figure 2 shown, the thickness of the elastic sealing pad 17 in the horizontal direction is less than the width of the rectangular sealing groove 4 in the horizontal direction, so that the elastic sealing pad 17 can be easily inserted into the rectangular sealing groove 4. The height of the elastic sealing pad 17 is greater than the depth of the rectangular sealing groove 4. When the housing upper cover 2 is attached to the battery housing 1 for connection, the elastic sealing pad 17 will be compressed and deformed. The height of the elastic sealing pad 17 decreases, while the thickness of the elastic sealing pad 17 increases to fill the rectangular sealing groove 4, so that the elastic sealing pad 17 is press-fitted in the rectangular sealing groove 4 to form a high-strength sealing surface. While improving the sealing performance, it does not affect the connection and installation between the housing upper cover 2 and the battery housing 1.

[0022] Furthermore, as Figure 1As shown, the upper shell cover 2 is connected to the battery shell 1 by screws 5. The screws 5 are located outside the elastic sealing gasket 17, so that the screws 5 will not damage the sealing performance of the elastic sealing gasket 17. A plurality of first mounting side plates 6 are fixed on the side wall of the battery shell 1, and a plurality of second mounting side plates 7 are fixed on the side wall of the upper shell cover 2. The plurality of second mounting side plates 7 correspond to the plurality of first mounting side plates 6 one by one. A threaded hole 8 is provided on the top surface of the first mounting side plate 6, and a through hole 9 is provided through the second mounting side plate 7. The tail of the screw 5 passes through the through hole 9 and is fitted in the threaded hole 8. Since a rectangular sealing groove 4 is provided on the top surface of the battery shell 1, the remaining space is not sufficient to install the screw 5. Therefore, through the arrangement of the first mounting side plate 6 and the second mounting side plate 7, the connection position is set on the side wall of the battery shell 1, and there is enough space to connect the battery shell 1 and the upper shell cover 2 together.

[0023] Further, as Figure 1 and Figure 3 shown, a small hole 10 is provided through the upper shell cover 2. The electrical connection protrusion 11 of the lithium iron phosphate battery 3 passes out of the small hole 10. A sealing ring 12 is provided between the small hole 10 and the electrical connection protrusion 11. The inner hole shape of the sealing ring 12 is conical, and the inner diameter gradually decreases in the direction away from the battery shell 1. The maximum inner diameter of the sealing ring 12 is larger than the diameter of the electrical connection protrusion 11, and the minimum inner diameter of the sealing ring 12 is smaller than the diameter of the electrical connection protrusion 11. The gap between the electrical connection protrusion 11 and the small hole 10 is eliminated through the sealing ring 12, and the sealing performance at the position of the electrical connection protrusion 11 is improved, thereby comprehensively improving the sealing performance of the lithium iron phosphate battery pack; when the upper shell cover 2 is connected to the battery shell 1, the electrical connection protrusion 11 first penetrates from the maximum inner diameter of the sealing ring 12, so that the electrical connection protrusion 11 can be easily inserted into the sealing ring 12. During the installation process, the electrical connection protrusion 11 will squeeze the inner wall of the sealing ring 12. Under the guidance of the conical inner hole of the sealing ring 12, the electrical connection protrusion 11 squeezes the sealing ring 12 to deform, so that the electrical connection protrusion 11 can smoothly pass through the sealing ring 12, and the sealing ring 12 and the electrical connection protrusion 11 are in interference fit, having strong sealing performance.

[0024] Further, as Figure 1 and Figure 4As shown, a visual window 13 is penetrated and opened at the bottom of the battery housing 1 directly below each lithium iron phosphate battery 3. A transparent sealing plate 14 is fixed in the visual window 13. The top surface of the transparent sealing plate 14 is lower than the inner bottom surface of the battery housing 1. Since the lithium iron phosphate battery pack has strong sealing performance and the battery liquid cannot overflow, it is impossible to judge the quality of the lithium iron phosphate battery 3 in the battery housing 1. Therefore, the visual window 13 is provided, and the transparent sealing plate 14 blocks the visual window 13 to prevent liquid leakage. The situation inside the battery housing 1 can be observed through the transparent sealing plate 14, thereby judging whether the lithium iron phosphate battery 3 is damaged and leaking liquid; the top surface of the transparent sealing plate 14 is lower than the inner bottom surface of the battery housing 1, so that the transparent sealing plate 14 can store liquid, thus enabling a more intuitive judgment of whether the lithium iron phosphate battery 3 is damaged and leaking liquid.

[0025] Furthermore, as Figure 4 shown, a plurality of transverse grooves 15 and a plurality of longitudinal grooves 16 are formed on the inner bottom surface of the battery housing 1. Both the transverse grooves 15 and the longitudinal grooves 16 communicate with the visual window 13. Both the transverse grooves 15 and the longitudinal grooves 16 are inclined. The low ends of the transverse grooves 15 and the low ends of the longitudinal grooves 16 both communicate with the visual window 13, so that the liquid leaked from the damaged lithium iron phosphate battery 3 can flow into the visual window 13 through the transverse grooves 15 and the longitudinal grooves 16, facilitating an intuitive judgment of whether the lithium iron phosphate battery 3 is damaged and leaking liquid.

Claims

1. A leak-proof lithium iron phosphate battery pack, characterized in that: The invention comprises a battery shell (1) and a shell cover (2), wherein the top of the battery shell (1) is open, a plurality of lithium iron phosphate batteries (3) are installed in the battery shell (1), a rectangular sealing groove (4) is provided around the top of the battery shell (1) and an elastic sealing pad (17) is fixed to the bottom of the shell cover (2), the shape of the elastic sealing pad (17) matches the shape of the rectangular sealing groove (4), and when the shell cover (2) is connected to the battery shell (1), the elastic sealing pad (17) is interference fit in the rectangular sealing groove (4).

2. The leak-proof lithium iron phosphate battery pack according to claim 1, characterized in that: The thickness of the elastic sealing pad (17) in the horizontal direction is smaller than the width of the rectangular sealing groove (4) in the horizontal direction, and the height of the elastic sealing pad (17) is greater than the depth of the rectangular sealing groove (4).

3. The leak-proof lithium iron phosphate battery pack according to claim 1, characterized in that: The housing upper cover (2) is connected to the battery housing (1) via screws (5), and the screws (5) are located outside the elastic sealing pad (17).

4. The leak-proof lithium iron phosphate battery pack according to claim 3, characterized in that: A plurality of first mounting side plates (6) are fixed to the side wall of the battery housing (1), and a plurality of second mounting side plates (7) are fixed to the side wall of the housing upper cover (2), wherein the plurality of second mounting side plates (7) correspond one to one with the plurality of first mounting side plates (6), a threaded hole (8) is provided on the top surface of the first mounting side plate (6), and a through hole (9) is provided through the second mounting side plate (7), and the tail of the screw (5) passes through the through hole (9) and fits into the threaded hole (8).

5. The leak-proof lithium iron phosphate battery pack according to claim 1, characterized in that: The shell upper cover (2) is provided with a small hole (10) through which the electrical connection protrusion (11) of the lithium iron phosphate battery (3) passes out, and a sealing ring (12) is provided between the small hole (10) and the electrical connection protrusion (11).

6. The leak-proof lithium iron phosphate battery pack according to claim 5, characterized in that: The inner hole of the sealing ring (12) is conical in shape, and the inner diameter gradually decreases in the direction away from the battery housing (1); the maximum inner diameter of the sealing ring (12) is greater than the diameter of the electrical connection protrusion (11), and the minimum inner diameter of the sealing ring (12) is less than the diameter of the electrical connection protrusion (11).

7. The leak-proof lithium iron phosphate battery pack according to claim 1, characterized in that: The bottom of the battery housing (1) is provided with a visible window (13) directly below each of the lithium iron phosphate batteries (3), a transparent sealing plate (14) is fixed in the visible window (13), and the top surface of the transparent sealing plate (14) is lower than the inner bottom surface of the battery housing (1).

8. The leak-proof lithium iron phosphate battery pack according to claim 7, characterized in that: The inner bottom surface of the battery housing (1) is provided with a plurality of transverse grooves (15) and a plurality of longitudinal grooves (16), and the transverse grooves (15) and the longitudinal grooves (16) are both connected to the visible window (13).

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