Safety protection type lithium battery pack

Abstract

The utility model discloses a safety protection type lithium battery pack which comprises a bottom shell and an upper cover, the bottom shell and the upper cover are matched and detachably buckled, lithium battery units are arranged in the bottom shell in a rectangular array mode, a clamping base is arranged at the bottom of the bottom shell, and the lithium battery units are installed on the clamping base in a positioning mode. Supporting frames are arranged on the front side and the rear side of the bottom shell correspondingly, a connecting rod is arranged between the two supporting frames, the connecting rod is arranged in a gap between every two lithium battery units which are adjacent left and right, each lithium battery unit is provided with a deformation triggering assembly, and the deformation triggering assemblies are used for detecting the deformation conditions of the lithium battery units in real time. According to the utility model, the problem that the deformation of the lithium battery unit caused by over-charging or over-discharging cannot be found in time in the prior art is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries, and particularly relates to a safety protection type lithium battery pack. Background Art

[0002] The lithium battery housing provides strong physical protection for the internal electrode materials, electrolytes and other key components, preventing them from being affected by external mechanical impacts, squeezes and abrasions, and can effectively protect the normal use of the lithium battery pack. For some lithium batteries applied to special environments, such as electric vehicles, energy storage systems, etc., the housing needs to have higher strength and impact resistance to cope with more complex working conditions. However, due to the relatively hard structure of the lithium battery housing, when an individual battery in the lithium battery pack is over-discharged or over-charged, the deformation of the battery cannot be directly shown, so the battery failure cannot be detected in time. When the battery is continued to be used, on the one hand, the safety risk is increased, and on the other hand, it is also possible to squeeze and deform other batteries. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a safety protection type lithium battery pack to solve the problem that the lithium battery unit in the prior art is deformed due to overcharging or over-discharging but cannot be detected in time.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: A safety protection type lithium battery pack includes a bottom case and an upper cover. The bottom case and the upper cover are detachably buckled and matched. The lithium battery units are arranged in a rectangular array in the bottom case. A card seat is arranged at the bottom of the bottom case, and the lithium battery units are positioned and installed on the card seat. Support frames are arranged on both the front and rear sides of the bottom case. A connecting rod is arranged between the two support frames. The connecting rod is arranged in the gap between two adjacent lithium battery units on the left and right. A deformation trigger assembly is arranged on the lithium battery unit, and the deformation trigger assembly is used to detect the deformation condition of the lithium battery unit in real time.

[0005] As a further description of the above technical scheme: The deformation trigger assembly includes a trigger plate attached to the side surface of the lithium battery unit. A rotating shaft is arranged at the upper end of the trigger plate. The side surface of the rotating shaft is tangent to the upper surface of the lithium battery unit. Eccentric shafts are arranged at both ends of the rotating shaft. A sliding seat is arranged on the connecting rod. One sliding seat is correspondingly arranged for the two eccentric shafts corresponding to the two trigger plates located between the front and rear gaps of two lithium battery units. The sliding seat is fixedly arranged on the connecting rod, and the eccentric shaft is slidably arranged on the sliding seat.

[0006] As a further description of the above technical solution: A sliding groove is formed in the sliding seat, and two positioning rotating seats are slidably arranged in the sliding groove. The eccentric shafts correspond to the positioning rotating seats one by one, and the eccentric shafts are rotatably arranged in the positioning rotating seats. A spring is arranged between the two positioning rotating seats. When the trigger plate maintains a vertical state, under the action of the spring, the two positioning rotating seats are respectively located at both ends of the sliding groove, and the eccentric shafts press the positioning rotating seats.

[0007] As a further description of the above technical solution: An installation groove communicating with the sliding groove is formed above the sliding seat, and a sliding plate is slidably arranged in the installation groove. The sliding plate is connected with the positioning rotating seat.

[0008] As a further description of the above technical solution: A pressing plate is rotatably arranged between the two sliding seats corresponding to each lithium battery unit. A limiting rotating head is rotatably arranged on the connecting rod. The limiting rotating head corresponds to the pressing plate, and a torsion spring is arranged at the rotating shaft of the pressing plate.

[0009] As a further description of the above technical solution: Conductive bodies are respectively arranged on the two trigger plates located between the gaps of the two lithium battery units. The conductive bodies are copper wires. The conductive bodies are embedded in the opposite side surfaces of the two trigger plates. The upper ends of the two conductive bodies are connected with an alarm. When the two trigger plates are in contact, the conductive bodies cause the alarm to give an alarm. The trigger plates are made of aluminum oxide plates.

[0010] As a further description of the above technical solution: A handle is arranged on the upper surface of the upper cover.

[0011] As a further description of the above technical solution: The card seat is divided into a corner card seat and a middle card seat. The corner card seat is provided with a positioning card slot, and the middle card seat is provided with a card notch.

[0012] As a further description of the above technical solution: The bottom of the support frame is fixedly connected with the bottom shell. Reinforcing ribs are arranged in the middle of the support frame. The support frame is made of stainless steel.

[0013] As a further description of the above technical solution: Both the bottom shell and the upper cover are made of stainless steel.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present utility model are as follows:

[0015] In the present utility model, (1) Through the trigger plates arranged at the gaps between adjacent lithium battery units, when the lithium battery units are deformed and expanded due to overcharging or over-discharging, the trigger plates are lifted and rotated, and the conductive bodies enable the alarm to be conducted and give an alarm. Therefore, the battery failure can be detected in time, which is convenient for timely maintenance and replacement.

[0016] (2) The alumina plate is both an insulator and has good heat dissipation performance. When the battery is working properly, it can dissipate heat better. And under the action of the rotating shaft and the pressing plate, the lithium battery unit can be stably limited on the card seat.

[0017] (3) Each lithium battery unit is separately limited and fixed, so it does not affect the stability of other lithium battery units during maintenance and replacement. Description of the Drawings

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0019] Figure 2 is an exploded view of the upper cover and the bottom shell of the present utility model;

[0020] Figure 3 is a partial cross-sectional view of the bottom shell of the present utility model;

[0021] Figure 4 is an internal exploded view of the bottom shell of the present utility model;

[0022] Figure 5 is a position relationship diagram between the trigger plate and the sliding seat of the present utility model;

[0023] Figure 6 is a side view of the trigger plate and the sliding seat of the present utility model.

[0024] Legend: 1. Lithium battery unit; 2. Upper cover; 3. Handle; 4. Bottom shell; 5. Corner clamping seat; 6. Middle clamping seat; 7. Positioning clamping groove; 8. Clamping notch; 9. Support frame; 10. Connecting rod; 11. Trigger plate; 12. Rotating shaft; 13. Eccentric shaft; 14. Sliding seat; 15. Sliding groove; 16. Positioning rotating seat; 17. Spring; 18. Installation groove; 19. Sliding plate; 20. Limiting turning head; 21. Pressing plate. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Please refer to Figure 1-6 , the present utility model provides a technical solution for a safety protection type lithium battery pack:

[0027] A safety-protected lithium battery pack, comprising a bottom case 4 and an upper cover 2. Both the bottom case 4 and the upper cover 2 are integrally formed of stainless steel. The bottom case 4 and the upper cover 2 are detachably snap-fitted. The lower edge of the upper cover 2 is bent inward to form a plug-in edge, which is adapted to the upper end opening of the bottom case 4. The bottom case 4 and the upper cover 2 are connected by bolts. A handle 3 is provided on the upper surface of the upper cover 2 to facilitate the handling of the lithium battery pack.

[0028] The lithium battery units 1 are arranged in a rectangular array in the bottom case 4, and there are uniform gaps between adjacent lithium battery units 1. A card seat is provided at the bottom of the bottom case 4, and the lithium battery units 1 are positioned and installed on the card seat. The card seat is divided into a corner card seat 5 and a middle card seat 6. The corner card seat 5 is provided with a positioning card slot 7, and the middle card seat 6 is provided with a card notch 8. Each lithium battery unit 1 corresponds to a card notch 8 and two positioning card slots 7. The four corners and the middle of the bottom of the lithium battery unit 1 are supported by the card seat. The card seat is made of aluminum alloy and is fixed to the bottom of the bottom case 4 by bolts. The lithium battery units 1 are supported by the card seat, so that there is a gap between the lithium battery units and the bottom case 4, and thus the lithium battery units 1 can be well cooled.

[0029] Support frames 9 are provided on both the front and rear sides of the bottom case 4. The bottom of the support frame 9 is fixedly connected to the bottom case 4. A reinforcing rib is provided in the middle of the support frame 9. The support frame 9 is made of stainless steel. A connecting rod 10 is provided between the two support frames 9. Connecting heads are provided at both ends of the connecting rod 10, and the connecting heads are fixedly provided on the support frame 9. The connecting rod 10 is arranged in the gap between two adjacent lithium battery units 1 on the left and right. A deformation trigger assembly is provided on the lithium battery unit 1, and the deformation trigger assembly is used to detect the deformation of the lithium battery unit 1 in real time.

[0030] The deformation trigger assembly includes a trigger plate 11 attached to the side of the lithium battery unit 1. The trigger plate 11 is an alumina plate. A rotating shaft 12 is provided at the upper end of the trigger plate 11. The side of the rotating shaft 12 is tangent to the upper surface of the lithium battery unit 1. Eccentric shafts 13 are provided at both ends of the rotating shaft 12. A sliding seat 14 is provided on the connecting rod 10. One sliding seat 14 is provided corresponding to the two eccentric shafts 13 of the two trigger plates 11 located between the front and rear gaps of the two lithium battery units 1. A sliding slot 15 is provided on the sliding seat 14. Two positioning rotating seats 16 are slidably arranged in the sliding slot 15. The eccentric shafts 13 correspond to the positioning rotating seats 16 one by one, and the eccentric shafts 13 are rotatably arranged in the positioning rotating seats 16. A spring 17 is provided between the two positioning rotating seats 16. When the trigger plate 11 is kept vertical, under the action of the spring 17, the two positioning rotating seats 16 are respectively located at both ends of the sliding slot 15, and the eccentric shafts 13 press against the positioning rotating seats 16.

[0031] Above the sliding seat 14, there is an installation groove 18 communicating with the sliding groove 15. A sliding plate 19 is slidably arranged in the installation groove 18. The sliding plate 19 is connected to the positioning rotating seat 16. By moving the sliding plate 19 to compress the spring 17, the positioning rotating seat 16 can be moved and the trigger plate 11 can be driven to move.

[0032] A pressing plate 21 is rotatably arranged between two sliding seats 14 corresponding to each lithium battery unit 1. A limiting rotating head 20 is rotatably arranged on the connecting rod 10. The limiting rotating head 20 corresponds to the pressing plate 21. A torsion spring is arranged at the rotating shaft 12 of the pressing plate 21. Under the action of the limiting rotating head 20, it is pressed tightly on the upper surface of the lithium battery unit 1.

[0033] Conductive bodies (not shown in the figure) are respectively arranged on two trigger plates 11 located between the gaps of two lithium battery units 1. The conductive bodies are copper wires. The conductive bodies are embedded in the opposite side surfaces of the two trigger plates 11. The upper ends of the two conductive bodies are connected to the alarm. When the two trigger plates 11 come into contact, the conductive bodies cause the alarm to sound.

[0034] Working principle: After the lithium battery pack is installed in the bottom case 4, as shown in the figure, each lithium battery unit 1 is fixed separately. At this time, the pressing plate 21 is pressed tightly on the left and right sides of the lithium battery unit 1. At the same time, the rotating shaft 12 of the trigger plate 11 is also pressed tightly on the upper surface of the lithium battery. And under the action of the spring 17, the positioning rotating seat 16 is located at both ends of the sliding groove 15. At this time, under the action of the eccentric shaft 13, the positioning rotating seat 16 abuts tightly in the sliding groove 15.

[0035] When the lithium battery unit 1 deforms and expands, first, the expanded lithium battery unit 1 causes the trigger plate 11 to rotate until the lower edge of the trigger plate 11 abuts against the surface of another trigger plate 11. At this time, the conductive bodies on the two lithium battery units 1 are conducted, causing the alarm to sound. During the further deformation of the lithium battery unit 1 in this process, the rotated trigger plate 11 causes the eccentric shaft 13 to no longer abut tightly against the positioning rotating seat 16. Therefore, the spring 17 is compressed, causing the trigger plate 11 to move away from the expanded lithium battery unit 1 as a whole, so that the rotating shaft 12 is no longer located above it.

[0036] When disassembling and replacing the lithium battery, the deformed lithium battery unit 1 can be determined by observing the position of the sliding plate 19. Then, the limit of the pressing plate 21 by the limiting rotating head 20 is released. Under the action of the torsion spring, the pressing plate 21 does not limit the lithium battery unit 1, so as to quickly remove it. When replacing the lithium battery unit 1, directly put the lithium battery unit 1 into the corresponding position and press it in. Then, under the action of the spring 17, the positioning rotating seat 16 moves to the end of the sliding groove 15 again. At the same time, under the action of the gravity of the trigger plate 11, the trigger plate 11 contacts the side surface of the new lithium battery unit 1.

[0037] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.

Claims

1. A safety-protected lithium battery pack, characterized in that It includes a bottom case (4) and an upper cover (2). The bottom case (4) and the upper cover (2) are adapted for detachable snap-fitting. The lithium battery units (1) are arranged in a rectangular array in the bottom case (4). A card seat is provided at the bottom of the bottom case (4), and the lithium battery units (1) are positioned and installed on the card seat. Support frames (9) are provided on both the front and rear sides of the bottom case (4), and a connecting rod (10) is provided between the two support frames (9). The connecting rod (10) is arranged in the gap between two adjacent lithium battery units (1) on the left and right. A deformation triggering component is provided on the lithium battery unit (1), and the deformation triggering component is used to detect the deformation condition of the lithium battery unit (1) in real time.

2. The safety protection type lithium battery pack according to claim 1, wherein: The deformation triggering component includes a trigger plate (11) attached to the side surface of the lithium battery unit (1). A rotating shaft (12) is provided at the upper end of the trigger plate (11). The side surface of the rotating shaft (12) is tangent to the upper surface of the lithium battery unit (1). Eccentric shafts (13) are provided at both ends of the rotating shaft (12). A sliding seat (14) is provided on the connecting rod (10). One sliding seat (14) is correspondingly provided for the two eccentric shafts (13) corresponding to the two trigger plates (11) located between the front and rear gaps of the two lithium battery units (1). The sliding seat (14) is fixedly provided on the connecting rod (10), and the eccentric shaft (13) is slidably provided on the sliding seat (14).

3. The safety protection type lithium battery pack according to claim 2, wherein: A sliding groove (15) is formed on the sliding seat (14). Two positioning rotating seats (16) are slidably provided in the sliding groove (15). The eccentric shafts (13) correspond to the positioning rotating seats (16) one by one, and the eccentric shafts (13) are rotatably provided in the positioning rotating seats (16). A spring (17) is provided between the two positioning rotating seats (16). When the trigger plate (11) maintains a vertical state, the two positioning rotating seats (16) are respectively located at both ends of the sliding groove (15) under the action of the spring (17), and the eccentric shaft (13) presses the positioning rotating seat (16).

4. The safety protection type lithium battery pack according to claim 3, wherein: An installation groove (18) communicating with the sliding groove (15) is formed above the sliding seat (14). A sliding plate (19) is slidably provided in the installation groove (18), and the sliding plate (19) is connected to the positioning rotating seat (16).

5. The safety-protected lithium battery pack according to claim 3, wherein: A pressing plate (21) is rotatably provided between the two sliding seats (14) corresponding to each lithium battery unit (1). A limiting head (20) is rotatably provided on the connecting rod (10). The limiting head (20) corresponds to the pressing plate (21), and a torsion spring is provided at the rotating shaft (12) of the pressing plate (21).

6. A safety protection type lithium battery pack according to claim 2, characterized in that: Conductive bodies are respectively provided on the two trigger plates (11) located between the gaps of the two lithium battery units (1). The conductive bodies are copper wires, and the conductive bodies are embedded in the opposite side surfaces of the two trigger plates (11). The upper ends of the two conductive bodies are connected to an alarm. When the two trigger plates (11) come into contact, the conductive bodies cause the alarm to sound. The trigger plate (11) is an aluminum oxide plate.

7. A safety-protected lithium battery pack according to claim 1, characterized in that: A handle (3) is provided on the upper surface of the upper cover (2).

8. The safety protection type lithium battery pack according to claim 1, characterized in that: The card holder is divided into a corner clamping seat (5) and a middle clamping seat (6). The corner clamping seat (5) is provided with a positioning clamping groove (7), and the middle clamping seat (6) is provided with a clamping notch (8).

9. A safety-protected lithium battery pack according to claim 1, wherein: The bottom of the support frame (9) is fixedly connected to the bottom shell (4). Reinforcing ribs are arranged in the middle of the support frame (9), and the support frame (9) is made of stainless steel.

10. The safety protection type lithium battery pack according to claim 1, characterized in that: Both the bottom shell (4) and the upper cover (2) are made of stainless steel.

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