Square battery with bent pipe heat dissipation structure

Abstract

The utility model discloses a square battery with elbow heat dissipation structure, including the shell, a plurality of battery roll cores are equipped in the shell, the shell top is equipped with the end cover, two pole posts are equipped with on the end cover symmetry, every pole post is through rivet and extends to the shell and contacts with battery roll core, and a plurality of rivets on same pole post are all equipped with the busbar between with battery roll core, the insulating piece no.

Description

Technical Field

[0001] This utility model relates to the field of battery heat dissipation technology, and in particular to a square battery with a bent tube heat dissipation structure. Background Technology

[0002] In the current context of rapid development in the new energy industry, prismatic batteries are widely used in electric vehicles, energy storage power stations, portable electronic devices and other fields due to their stable structure, high energy density and excellent space utilization. As end products continue to increase their requirements for range and power output, the energy density of prismatic batteries continues to rise, and the heat generated during charging and discharging also increases significantly.

[0003] Battery operating temperature is a key factor affecting its performance and lifespan. Related research shows that when prismatic batteries operate at high temperatures (typically exceeding 40°C), the internal chemical reaction rate accelerates abnormally, easily leading to electrolyte decomposition, damage to the active material structure, and potential safety hazards such as thermal runaway. Simultaneously, excessively high temperatures significantly reduce battery cycle life, shortening its service life. Furthermore, differences in charge-discharge consistency among individual cells within the battery pack further exacerbate localized heat accumulation, forming "hot spots." These "hot spots," in turn, worsen the battery pack's consistency, creating a vicious cycle that severely impacts the reliability and safety of the entire battery system.

[0004] To address battery heat dissipation issues, existing technologies often employ centralized cooling solutions for the entire battery pack. However, since heat must be conducted from inside the battery to the outside of the pack before it can be exchanged with the cooling medium, the heat transfer path is long and the thermal resistance is high, resulting in generally low cooling and heat dissipation efficiency. Furthermore, for "hot spots" generated within the battery pack, the overall cooling method cannot achieve precise cooling, and heat tends to accumulate locally. This not only affects the performance of the battery in that area but also accelerates its aging process, thereby shortening the lifespan of the entire battery pack.

[0005] To address this issue, a square battery with a bent tube heat dissipation structure is proposed to solve the problems existing in the prior art. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems by providing a square battery with a bent-tube heat dissipation structure. This invention, through the inclusion of a cooling component, enables direct cooling of individual battery cores. Compared to the centralized cooling of the entire battery pack in existing technologies, this shortens the heat transfer path, reduces thermal resistance, and significantly improves cooling and heat dissipation efficiency. It can quickly remove the heat generated by the battery cores, effectively preventing the formation of localized hot spots. To achieve the aforementioned objectives, the technical solution adopted by this invention is as follows: According to one aspect of the present invention, a square battery with a bent tube heat dissipation structure is provided, including a housing, wherein multiple battery cores are arranged horizontally inside the housing, and a gap is provided between adjacent battery cores. A gap is provided between the multiple battery cores and the left and right inner sidewalls of the housing. An end cap is provided on the top of the housing, and two terminals are symmetrically arranged on the end cap. Each terminal extends into the housing and contacts a battery core via a rivet. A busbar is provided between multiple rivets on the same terminal and the battery core. An insulating element is provided between each terminal and the end cap, and a second insulating element is provided between the rivets and the busbar and the end cap. A cooling assembly is provided inside the housing for cooling individual battery cores.

[0007] Preferably, the cooling assembly includes a plurality of heat exchange tubes disposed between each gap, and the plurality of heat exchange tubes are wound around the gaps between the plurality of battery cores. The outer casing is provided with a liquid exchange unit, and the plurality of heat exchange tubes are all connected to the liquid exchange unit.

[0008] Preferably, the outer casing has two manifolds inside, and the two manifolds are respectively located in the left and right end gaps between the battery core and the inner side wall of the outer casing. The front and rear ends of multiple heat exchange tubes in the gaps are respectively connected to the corresponding manifolds. Each manifold extends upward to the outside of the end cap, and multiple manifolds are connected to the liquid exchange unit.

[0009] Preferably, each of the current collectors is provided with a baffle plate at the bottom, and the baffle plate is located between the current collector and the inner wall of the outer casing.

[0010] Preferably, the end cap is provided with an explosion-proof valve.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: The square battery with a bent tube heat dissipation structure described in this utility model can directly cool a single battery core by setting a cooling component. Compared with the centralized cooling of the entire battery pack in the prior art, it shortens the heat transfer path, reduces thermal resistance, and greatly improves cooling efficiency and heat dissipation efficiency. It can quickly remove the heat generated by the battery core and effectively avoid the formation of local hot spots. Attached Figure Description

[0012] Figure 1 This is a perspective view of the present invention; Figure 2 This is a partial cross-sectional perspective view of the internal structure of this utility model; Figure 3 This is a utility model Figure 2 Enlarged view of point A; Figure 4 This is a top view of the internal structure of this utility model; In the attached diagram: 1. Outer shell; 2. Battery winding core; 3. Gap; 4. Spacing; 5. End cap; 6. Terminal post; 7. Rivet; 8. Heat exchange tube; 9. Current collector; 10. Sheet; 11. Insulator 1; 12. Explosion-proof valve; 13. Insulator 2; 14. Busbar. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the utility model, and these aspects can be achieved even without these specific details.

[0014] Please see Figures 1 to 4 This utility model provides a square battery with a bent tube heat dissipation structure, the technical solution of which is as follows: The outer casing 1 contains multiple battery cores 2 arranged horizontally in sequence, with a gap 3 between adjacent battery cores 2. A gap 4 is provided between the multiple battery cores 2 and the left and right inner sidewalls of the outer casing 1. An end cap 5 is provided at the top of the outer casing 1, and two terminals 6 are symmetrically arranged on the end cap 5. Each terminal 6 extends into the outer casing 1 through a rivet 7 and contacts the battery core 2. A busbar 14 is provided between the multiple rivets 7 on the same terminal 6 and the battery core 2. An insulating component 11 is provided between each terminal 6 and the end cap 5, and an insulating component 13 is provided between the rivets 7 and the busbar 14 and the end cap 5. A cooling assembly is provided inside the outer casing 1 for cooling individual battery cores 2.

[0015] By setting up a cooling component, individual battery cores 2 can be directly cooled. Compared with the centralized cooling of the entire battery pack in the prior art, the heat transfer path is shortened, the thermal resistance is reduced, and the cooling efficiency and heat dissipation efficiency are greatly improved. The heat generated by the battery cores 2 can be quickly removed, effectively avoiding the formation of local hot spots. The precise cooling method can keep each battery core 2 within a suitable operating temperature range, reducing problems such as electrolyte decomposition and active material structure damage caused by high temperature, reducing the risk of thermal runaway, and significantly extending the cycle life and overall service life of the battery.

[0016] The terminal post 6, as the current collection and output component of the battery pack, is connected to the tab of the battery core 2 through the rivet 7 and the busbar 14, and carries the large current during the charging and discharging process of the battery. The end cap 5 and the outer shell 1, as structural support components of the battery, are mostly made of metal and have good conductivity. The first insulating component 11 and the second insulating component 13, through their own high insulation characteristics, form a physical isolation layer between the end cap 5 and the terminal post 6, the rivet 7 and the busbar 14, which can completely block the current path between structural components, effectively avoid short circuit problems, fundamentally ensure the electrical safety of the battery, and reduce the probability of triggering serious accidents such as thermal runaway.

[0017] The cooling assembly includes multiple heat exchange tubes 8 disposed between each gap 3, and the multiple heat exchange tubes 8 are wound around the gaps 3 between multiple battery cores 2. A fluid exchange unit is provided outside the outer shell 1, and the multiple heat exchange tubes 8 are all connected to the fluid exchange unit. The fluid exchange unit is a coolant supply device and a pump. Two manifolds 9 are both connected to the coolant supply device, and circulation is achieved through the pump. Two manifolds 9 are provided inside the outer shell 1, and the two manifolds 9 are respectively disposed in the left and right end gaps 4 between the battery core 2 and the inner side wall of the outer shell 1. The front and rear ends of the multiple heat exchange tubes 8 in the gaps 3 are respectively connected to the corresponding manifolds 9. Each manifold 9 extends upward to the outside of the end cap 5, and the multiple manifolds 9 are all connected to the fluid exchange unit.

[0018] The heat exchange tube 8 is wound within the gap 3 between the battery cores 2, allowing it to contact each individual battery core 2 in close proximity and directly cool it. This significantly shortens the heat transfer path, greatly improves cooling efficiency, and quickly dissipates the heat generated by the battery cores 2, effectively preventing localized overheating. The heat exchange tube 8 is connected to the manifold 9 and the liquid exchange unit to form a complete cooling circulation system. The manifold 9 collects and distributes the cooling medium, while the liquid exchange unit continuously provides the cooling medium, ensuring a stable cooling process. This guarantees that the battery maintains good heat dissipation even during long-term operation, further extending battery life and improving the overall reliability of the battery pack.

[0019] Each of the aforementioned manifolds 9 is provided with a baffle plate 10 at its bottom, and the baffle plate 10 is located between the manifold 9 and the inner wall of the outer shell 1. The baffle plate 10, located between the manifold 9 and the inner wall of the outer shell 1, can guide and restrict the flow of coolant between the manifold 9 and the outer shell 1, so that the coolant enters the heat exchange tube 8 or flows in the manifold 9 in a more orderly manner, avoiding disordered flow or short circuit of coolant, improving the flow efficiency of coolant in the cooling system, and thus enhancing the cooling effect.

[0020] The end cap 5 is equipped with an explosion-proof valve 12. Under abnormal conditions such as overcharging, short circuit, and high temperature, the prismatic battery will undergo a violent chemical reaction inside, producing a large amount of flammable gases such as hydrogen and carbon monoxide, which will cause the internal pressure of the battery to rise sharply. The explosion-proof valve 12 has a precise preset burst pressure value. When the internal pressure of the battery reaches this threshold, the explosion-proof valve 12 will open rapidly (such as the diaphragm ruptures or the valve pops open), quickly expelling the high-pressure gas and part of the electrolyte inside to the outside of the battery, thereby instantly reducing the internal pressure of the battery and preventing the continuous accumulation of pressure from causing the battery casing 1 to bulge, crack, or even explode, thus blocking the further development of thermal runaway from the source.

[0021] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A square battery with a bent pipe heat dissipation structure, characterized by, include: The outer shell (1) has multiple battery cores (2) inside. The multiple battery cores (2) are arranged horizontally in sequence, and there is a gap (3) between two adjacent battery cores (2). There is a gap (4) between the multiple battery cores (2) and the left and right inner walls of the outer shell (1). The top of the outer shell (1) has an end cap (5). Two pole posts (6) are symmetrically arranged on the end cap (5). Each pole post (6) extends into the outer shell (1) through a rivet (7) and contacts the battery core (2). There is a busbar (14) between the multiple rivets (7) on the same pole post (6) and the battery core (2). There is an insulating component one (11) between each pole post (6) and the end cap (5). There is an insulating component two (13) between the rivet (7) and the busbar (14) and the end cap (5). The outer shell (1) has a cooling component for cooling down a single battery core (2).

2. The square battery with a bent pipe heat dissipation structure according to claim 1, characterized in that: The cooling assembly includes a plurality of heat exchange tubes (8) disposed between each gap (3), and the plurality of heat exchange tubes (8) are wound around the gaps (3) between a plurality of battery cores (2). The outer shell (1) is provided with a liquid exchange unit, and the plurality of heat exchange tubes (8) are all connected to the liquid exchange unit.

3. The square battery with a bent tube heat dissipation structure according to claim 2, characterized in that: The outer shell (1) is provided with two manifolds (9), and the two manifolds (9) are respectively located in the left and right end gaps (4) between the battery core (2) and the inner side wall of the outer shell (1). The front and rear ends of the multiple heat exchange tubes (8) in the gap (3) are respectively connected to the corresponding manifolds (9). Each manifold (9) extends upward to the outside of the end cap (5), and the multiple manifolds (9) are connected to the liquid exchange unit.

4. The square battery with the bent pipe heat dissipation structure according to claim 3, characterized in that: Each of the manifolds (9) has a baffle plate (10) at its bottom, and the baffle plate (10) is located between the manifold (9) and the inner wall of the outer casing (1).

5. The square battery with a bent pipe heat dissipation structure according to claim 1, characterized in that: An explosion-proof valve (12) is provided on the end cap (5).

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