Multi-module battery pack temperature equalization structure

Abstract

The utility model relates to the technical field of battery modules, in particular to a multi-module battery pack temperature balancing structure which comprises a first box body, a second box body and an upper cover, a first battery module and a second battery module are installed between the first box body and the second box body in a sealing mode, and a third battery module is installed between the second box body and the upper cover in a sealing mode. The first box body is provided with a first power connection head, the first power connection head is electrically connected with the first battery module and the second battery module, the second box body is provided with a second power connection head, the second power connection head is electrically connected with the third battery module, and the first power connection head outside the outer box body is electrically connected with the second power connection head through a wire. According to the device, the temperature is effectively prevented from gathering towards the middle layer module, the problem that the temperature of the second battery module is higher than that of the upper layer and the lower layer in the using process is effectively solved, the problem of temperature alarm caused by large temperature difference is solved, and the service life of the battery module is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery modules, in particular to a temperature equalization structure for a multi-module battery pack. Background Technique

[0002] In order to improve the overall capacity of battery modules, in the prior art, a method of stacking multiple layers of modules as a whole is adopted to improve the overall capacity. However, when multiple layers of battery modules are placed in a battery box, the temperature in the battery box will converge towards the middle layer, resulting in heat accumulation in the middle layer modules and an increase in temperature. The overall temperature difference in the entire battery box is relatively large, the middle layer modules decay quickly, and the service life is shortened. Content of the Utility Model

[0003] The purpose of the utility model is to solve the problems that when multiple layers of battery modules are placed in a battery box, the temperature in the battery box will converge towards the middle layer, the overall temperature difference in the entire battery box is relatively large, the middle layer modules decay quickly, and the service life is shortened, and to propose a temperature equalization structure for a multi-module battery pack.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A temperature equalization structure for a multi-module battery pack, including an outer box body. Inside the outer box body, a first battery module, a second battery module, and a third battery module are stacked in sequence from bottom to top. The outer box body includes a first box body, a second box body, and an upper cover. The first battery module and the second battery module are hermetically installed between the first box body and the second box body, and the third battery module is hermetically installed between the second box body and the upper cover. The first box body is provided with a first power connection head, and the first power connection head is electrically connected to the first battery module and / or the second battery module. The second box body is provided with a second power connection head, and the second power connection head is electrically connected to the third battery module. The first power connection head outside the outer box body is electrically connected to the second power connection head through a wire.

[0006] The first box body has a first battery cavity groove, and the first battery module and the second battery module are located in the first battery cavity groove. The second box body has a second battery cavity groove and an electrical component cavity for placing electrical components, and the third battery module is located in the second battery cavity groove.

[0007] The first box body is provided with a first communication interface, and the first communication interface is electrically connected to the first battery module and the second battery module. The second box body is provided with a second communication interface and a vehicle communication interface. The first communication interface outside the outer box body is electrically connected to the second communication interface through a wire, and the vehicle communication interface inside the outer box body is electrically connected to a circuit board.

[0008] One side of the upper cover close to the second box body has a first outer edge extending outward around the perimeter, and one side of the second box body close to the upper cover has a second outer edge extending outward around the perimeter. The first outer edge abuts against the second outer edge and is fixed by fasteners;

[0009] and / or one side of the second box body close to the first box body has a third outer edge extending outward around the perimeter, and one side of the first box body close to the second box body has a fourth outer edge extending outward around the perimeter. The third outer edge abuts against the fourth outer edge and is fixed by fasteners.

[0010] The perimeter of the first outer edge has a first downward hanging edge extending towards the second box body, and the perimeter of the second outer edge has a second downward hanging edge extending towards the first box body. The first downward hanging edge is sleeved outside the second downward hanging edge;

[0011] and / or the perimeter of the third outer edge has a third downward hanging edge extending towards the first box body, and the perimeter of the fourth outer edge has a fourth downward hanging edge extending towards the bottom of the first box body. The third downward hanging edge is sleeved outside the fourth downward hanging edge.

[0012] The second box body includes a surrounding plate, a first bottom plate, and a second bottom plate. The bottom of the surrounding plate is hermetically fixed or integrally formed with the first bottom plate. The second bottom plate is welded to the bottom of the first bottom plate, and the perimeter of the second bottom plate has the third outer edge.

[0013] The perimeter of the second bottom plate is hermetically welded to the perimeter of the first bottom plate. The second bottom plate is provided with a plurality of through holes, and the second bottom plate is welded to the first bottom plate around the through holes.

[0014] A temperature equalization structure for a multi-module battery pack proposed by the present utility model has the beneficial effects that: the outer box body of the device is divided into two storage chambers. The first battery module and the second battery module are hermetically placed together, and the third battery module is placed separately. The three groups of battery modules are in two different box bodies respectively, and then the two box bodies are combined into one body. The upper and lower two storage chambers are completely separated, effectively preventing the temperature from gathering towards the middle layer module, effectively solving the problem that the temperature of the second battery module is relatively higher than that of the upper and lower layers during use, solving the problem of temperature alarm caused by large temperature difference, and effectively extending the service life of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic exploded view of the present utility model;

[0016] Figure 2 is a schematic exploded view of a half-section of the outer box body of the present utility model;

[0017] Figure 3 is a schematic perspective view of a half-section of the second box body of the present utility model;

[0018] Figure 4 Schematic diagram of the overall combined structure of the present utility model;

[0019] Figure 5 of the present utility model Figure 4 Front view structure schematic diagram.

[0020] In the figure: the first box body 1, the first battery cavity groove 2, the first battery module 3, the second battery module 4, the second box body 5, the second battery cavity groove 6, the electrical component cavity 7, the third battery module 8, the upper cover 9, the first outer edge 10, the first lower hanging edge 11, the second outer edge 12, the second lower hanging edge 13, the third outer edge 14, the third lower hanging edge 15, the fourth outer edge 16, the fourth lower hanging edge 17, the first communication interface 18, the second communication interface 19, the vehicle communication interface 20, the first power connection head 21, the second power connection head 22, the enclosure 51, the first bottom plate 52, the second bottom plate 53, the through hole 54. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying 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 the embodiments.

[0022] Referring to Figures 1-5 , a temperature equalization structure for a multi-module battery pack, including an outer box body. Inside the outer box body, the first battery module 3, the second battery module 4, and the third battery module 8 are stacked in sequence from bottom to top. The outer box body includes the first box body 1, the second box body 5, and the upper cover 9. The first battery module 3 and the second battery module 4 are hermetically installed between the first box body 1 and the second box body 5, and the third battery module 8 is hermetically installed between the second box body 5 and the upper cover 9. The first box body 1 is provided with a first power connection head 21, and the first power connection head 21 is electrically connected to the first battery module 3 and / or the second battery module 4. The second box body 5 is provided with a second power connection head 22, and the second power connection head 22 is electrically connected to the third battery module 8. The first power connection head 21 outside the outer box body is electrically connected to the second power connection head 22 through a wire.

[0023] This device divides the outer box body into two storage chambers. The first battery module 3 and the second battery module 4 are hermetically placed together, and the third battery module 8 is placed separately. The three groups of battery modules are in two different box bodies respectively, and then the two box bodies are combined into one body. The upper and lower two storage chambers are completely separated, effectively preventing the temperature from gathering in the middle layer module, effectively solving the problem that the temperature of the second battery module 4 is relatively higher than that of the upper and lower layers during use, solving the problem of temperature alarm caused by large temperature difference, and effectively extending the service life of the battery module.

[0024] As a series connection scheme, in the first box body 1, the first battery module 3 is connected in series with the second battery module 4. The second battery module 4 is electrically connected to the first power connection head 21. Then, the first power connection head 21 is electrically connected to the second power connection head 22 through a wire. The second power connection head 22 is connected in series with the third battery module 8 in the second box body 5. Finally, the first battery module 3, the second battery module 4, and the third battery module 8 are connected in series.

[0025] The first box body 1 has a first battery cavity 2. The first battery module 3 and the second battery module 4 are located in the first battery cavity 2. The second box body 5 has a second battery cavity 6 and an electrical component cavity 7 for placing electrical components. The third battery module 8 is located in the second battery cavity 6.

[0026] Reference Figure 1 , in this device, an electrical component cavity is provided in the second box body. The electrical components in the entire battery box are centrally placed in the electrical component cavity 7 of the second box body 5, which is convenient for the installation and maintenance of electrical components.

[0027] Reference Figure 5 , the first box body 1 is provided with a first communication interface 18. The first communication interface 18 is electrically connected to the first battery module 3 and the second battery module 4. The second box body 5 is provided with a second communication interface 19 and a vehicle communication interface 20. The first communication interface 18 outside the outer box body is electrically connected to the second communication interface 19 through a wire. The vehicle communication interface 20 located inside the outer box body is electrically connected to the circuit board.

[0028] The circuit between the first battery cavity 2 and the first battery module 3 of this device is connected to the electrical component cavity 7 of the second box body 5 through a wire outside the outer box body. It is connected in an external wiring manner, avoiding the flow of heat between the first battery cavity 2 and the second battery cavity 6, ensuring the heat insulation effect, and using this method, it is convenient to achieve the IP67 battery pack protection level.

[0029] To facilitate the sealing and fixing between the first box body 1, the second box body 5, and the upper cover 9, the first outer edge 10 extending outward is provided around one side of the upper cover 9 close to the second box body 5. The second outer edge 12 extending outward is provided around one side of the second box body 5 close to the upper cover 9. The first outer edge 10 abuts against the second outer edge 12 and is fixed by a fastener. By the way that the first outer edge 10 abuts against the second outer edge 12, the sealing performance can be improved. A sealing gasket can be provided between the first outer edge 10 and the second outer edge 12;

[0030] On the periphery of the side of the second box body 5 close to the first box body 1, there is a third outer edge 14 extending outwards. On the periphery of the side of the first box body 1 close to the second box body 5, there is a fourth outer edge 16 extending outwards. The third outer edge 14 abuts against the fourth outer edge 16 and is fixed by fasteners. By means of the third outer edge 14 and the fourth outer edge 16, the sealing performance can be improved, and a gasket can be arranged between the third outer edge 14 and the fourth outer edge 16.

[0031] To improve the assembly efficiency, sealing performance and installation stability, referring to Figure 2 , Figure 5 , around the first outer edge 10, there is a first hanging edge 11 extending towards the second box body 5. Around the second outer edge 12, there is a second hanging edge 13 extending towards the first box body 1. The first hanging edge 11 is sleeved outside the second hanging edge 13;

[0032] And / or around the third outer edge 14, there is a third hanging edge 15 extending towards the first box body 1. Around the fourth outer edge 16, there is a fourth hanging edge 17 extending towards the bottom of the first box body 1. The third hanging edge 15 is sleeved outside the fourth hanging edge 17.

[0033] By arranging the hanging edges, it is convenient to connect the upper cover 9 with the second box body 5 and connect the second box body 5 with the first box body 1.

[0034] Referring to Figure 3 , the second box body 5 includes a surrounding plate 51, a first bottom plate 52 and a second bottom plate 53. The bottom of the surrounding plate 51 is hermetically fixed or integrally formed with the first bottom plate 52. The second bottom plate 53 is welded to the bottom of the first bottom plate 52. The second bottom plate 53 has a third outer edge 14 around it. By arranging the second bottom plate 53 on the first bottom plate 52 and connecting the second bottom plate 53 with the first box body 1, the manufacturing difficulty and assembly difficulty of the entire outer box body are reduced.

[0035] Referring to Figure 3 , the periphery of the second bottom plate 53 and the periphery of the first bottom plate 52 are hermetically welded. The second bottom plate 53 is provided with a plurality of through holes 54. The second bottom plate 53 is welded to the first bottom plate 52 around the through holes 54. The size of the outer box body of this device is about 1000mm in length * 800mm in width * 600mm in height. Therefore, the length and width dimensions are relatively large. By adopting the method of arranging the through holes 54, the welding surface between the second bottom plate 53 and the first bottom plate 52 is increased, the overall connection strength is improved, and the deformation of the second bottom plate 53 and the first bottom plate 52 is avoided.

[0036] 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, makes equivalent substitutions or changes to obtain technical solutions, concepts, and designs, which should all be covered within the protection scope of the present utility model.

Claims

1. A multi-module battery pack temperature balancing structure, comprising an outer box, wherein a first battery module (3), a second battery module (4), and a third battery module (8) are stacked in sequence from bottom to top in the outer box, characterized in that: The outer box comprises a first box (1), a second box (5), and an upper cover (9); the first battery module (3) and the second battery module (4) are sealed and installed between the first box (1) and the second box (5); the third battery module (8) is sealed and installed between the second box (5) and the upper cover (9); the first box (1) is provided with a first electrical connector (21); the first electrical connector (21) is electrically connected to the first battery module (3) and / or the second battery module (4); the second box (5) is provided with a second electrical connector (22); the second electrical connector (22) is electrically connected to the third battery module (8); the first electrical connector (21) is electrically connected to the second electrical connector (22) via a wire outside the outer box.

2. A multi-module battery pack temperature balancing structure according to claim 1, characterized in that: The first box (1) has a first battery cavity (2), the first battery module (3) and the second battery module (4) are located in the first battery cavity (2), the second box (5) has a second battery cavity (6) and an electrical component cavity (7) for accommodating electrical components, and the third battery module (8) is located in the second battery cavity (6).

3. A multi-module battery pack temperature balancing structure according to claim 1 or 2, characterized in that: The first box (1) is provided with a first communication interface (18), the first communication interface (18) being electrically connected to the first battery module (3) and the second battery module (4); the second box (5) is provided with a second communication interface (19) and a vehicle communication interface (20); the first communication interface (18) is electrically connected to the second communication interface (19) via a wire outside the outer box, and the vehicle communication interface (20) is electrically connected to a circuit board inside the outer box.

4. A multi-module battery pack temperature balancing structure according to claim 1 or 2, characterized in that: The upper cover (9) has a first outer edge (10) extending outwardly around a side close to the second box body (5), and the second box body (5) has a second outer edge (12) extending outwardly around a side close to the upper cover (9), and the first outer edge (10) and the second outer edge (12) are abutted against each other and fixed by fasteners; And / or the second box body (5) has a third outer edge (14) extending outwards around a side close to the first box body (1), and the first box body (1) has a fourth outer edge (16) extending outwards around a side close to the second box body (5), and the third outer edge (14) abuts against the fourth outer edge (16) and is fixed by fasteners.

5. A multi-module battery pack temperature balancing structure according to claim 4, characterized in that: The first outer edge (10) is surrounded by a first lower hanging edge (11) extending toward the second box body (5); the second outer edge (12) is surrounded by a second lower hanging edge (13) extending toward the first box body (1); the first lower hanging edge (11) is sleeved on the outside of the second lower hanging edge (13); And / or the third outer edge (14) is surrounded by a third lower hanging edge (15) extending toward the first box body (1), the fourth outer edge (16) is surrounded by a fourth lower hanging edge (17) extending toward the bottom of the first box body (1), and the third lower hanging edge (15) is sleeved on the outside of the fourth lower hanging edge (17).

6. A multi-module battery pack temperature balancing structure according to claim 4, characterized in that: The second box body (5) comprises a surrounding plate (51), a first bottom plate (52), and a second bottom plate (53); the bottom of the surrounding plate (51) is sealed and fixed to the first bottom plate (52) or is integrally formed; the second bottom plate (53) is welded to the bottom of the first bottom plate (52); and the second bottom plate (53) has the third outer edge (14) around it.

7. A temperature balancing structure for a multi-module battery pack according to claim 6, characterized in that: The second bottom plate (53) is sealed and welded to the first bottom plate (52) at all sides. The second bottom plate (53) is provided with a plurality of through holes (54). The second bottom plate (53) is welded to the first bottom plate (52) at all sides of the through holes (54).

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