Square battery with straight pipe heat dissipation structure

Abstract

The utility model discloses a square battery with straight pipe heat dissipation structure, including the shell, the shell top is equipped with the end cover, the shell inside is equipped with two battery roll core, the symmetry is equipped with two pole post on the end cover, every pole post is through rivet and extends to the shell inside and contacts with battery roll core, and the rivet on same pole post is all equipped with the busbar between with battery roll core, every pole post with end cover between is equipped with insulating part 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 straight 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 straight-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 straight-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 this utility model, a square battery with a straight tube heat dissipation structure is provided, including a housing, an end cap on the top of the housing, two battery cores inside the housing, the two battery cores being arranged horizontally in sequence with a gap between them, and a gap between the two battery cores and the left and right inner sidewalls of the housing, two terminals symmetrically provided on the end cap, each terminal extending into the housing and contacting the battery core via a rivet, and a busbar being provided between multiple rivets on the same terminal and the battery core, an insulating element one between each terminal and the end cap, and an insulating element two between the rivets and the busbar and the end cap, and a cooling assembly inside the housing for cooling down individual battery cores.

[0007] Preferably, the cooling assembly includes multiple heat exchange tubes disposed between each gap, a liquid exchange unit is provided outside the outer shell, and two manifolds are provided inside the outer shell, which are symmetrically arranged in the left and right end gaps between the battery core and the inner sidewall of the outer shell. The front and rear ends of the multiple heat exchange tubes in the gap are respectively connected to the corresponding manifolds. Each manifold extends upward to the outside of the end cap, and the multiple manifolds are all connected to the liquid exchange unit. Each manifold has a baffle plate at its bottom, and the baffle plate is located between the manifold and the inner wall of the outer shell.

[0008] Preferably, the cross-sectional shape of each heat exchange tube is a flat, straight groove.

[0009] Preferably, the number of heat exchange tubes in the gap is at least three, and the multiple heat exchange tubes are arranged vertically in sequence.

[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 straight pipe 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 schematic diagram of the internal structure of this utility model; Figure 3 This is a utility model Figure 2 Top view; Figure 4 This is a cross-sectional view of the internal structure of this utility model; Figure 5 This is a utility model Figure 4 Enlarged view of point A; In the attached diagram: 1. Outer shell; 2. End cap; 3. Battery winding core; 4. Gap; 5. Spacing; 6. Terminal post; 7. Rivet; 8. Heat exchange tube; 9. Current collector; 10. Insulator component one; 11. Explosion-proof valve; 12. Resistor; 13. Insulator component two; 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 5 This utility model provides a square battery with a straight tube heat dissipation structure, the technical solution of which is as follows: The device includes an outer casing 1, with an end cap 2 on the top. Inside the outer casing 1 are two battery cores 3 arranged horizontally in sequence, with a gap 4 between them. There are also gaps 5 between the two battery cores 3 and the left and right inner sidewalls of the outer casing 1. The end cap 2 has two symmetrically arranged terminals 6, each of which extends into the outer casing 1 and contacts the battery core 3 via rivets 7. Multiple rivets 7 on the same terminal 6 are connected to the battery core 3 via busbars 14. Each terminal 6 is connected to the end cap 5 via an insulating component 10, and the rivets 7 and busbars 14 are connected to the end cap 2 via an insulating component 13. The outer casing 1 contains a cooling assembly for cooling individual battery cores 3. The end cap 2 has an explosion-proof valve 11.

[0015] By setting up a cooling component, individual battery cores 3 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 3 can be quickly removed, effectively avoiding the formation of local hot spots. The precise cooling method can keep each battery core 3 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 3 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 2 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 2 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] Under abnormal conditions such as overcharging, short circuit, and high temperature, the prismatic battery will undergo violent chemical reactions inside, producing a large amount of flammable gases such as hydrogen and carbon monoxide, causing the internal pressure of the battery to rise sharply. The explosion-proof valve 11 has a precise preset explosion pressure value. When the internal pressure of the battery reaches this threshold, the explosion-proof valve 11 will open rapidly (such as diaphragm rupture or valve popping open), quickly expelling the high-pressure gas and part of the electrolyte 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 11 to bulge, crack, or even explode, thus blocking the further development of thermal runaway from the source.

[0018] The cooling assembly includes multiple heat exchange tubes 8 disposed between each gap 4. A liquid exchange unit is provided outside the outer shell 1. Two manifolds 9 are provided inside the outer shell 1, and the two manifolds 9 are symmetrically arranged in the left and right end gaps 5 between the battery core 3 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 4 are respectively connected to the corresponding manifolds 9. Each manifold 9 extends upward to the outside of the end cap 2, and the multiple manifolds 9 are all connected to the liquid exchange unit. Each manifold 9 has a baffle 12 at its bottom, and the baffle 12 is located between the manifold 9 and the inner wall of the outer shell 1. The liquid exchange unit is a coolant supply device and a pressure pump. Both manifolds 9 are connected to the coolant supply device, and circulation is achieved through the cooperation of the pressure pump.

[0019] Multiple heat exchange tubes 8 are positioned in the gaps 4 between the battery cores 3, allowing direct heat exchange with the battery cores 3. Combined with the manifold 9 and the coolant exchange unit, this enables rapid circulation of the coolant, efficiently removing the heat generated by the battery cores 3, significantly improving heat dissipation efficiency and preventing overheating from affecting battery performance and lifespan. The coolant flow rate and temperature can be flexibly adjusted via the coolant exchange unit. Combined with the distribution of the manifold 9, precise temperature control can be achieved for battery cores 3 at different locations within the battery pack, reducing temperature differences within the pack and allowing each battery core 3 to operate in a more balanced temperature environment, thus improving the overall performance of the battery pack. The baffle 12 at the bottom of the manifold 9, located between the manifold 9 and the inner wall of the outer casing 1, acts as a seal and barrier, effectively preventing coolant leakage from the gap 4 between the manifold 9 and the inner wall of the outer casing 1. This ensures the sealing and reliability of the cooling system, preventing safety issues or impacts on cooling performance caused by leakage.

[0020] Each heat exchange tube 8 has a flat, straight groove cross-section. Compared to a circular cross-section, the flat, straight groove structure significantly increases the contact area with the battery core 3 within the same space, thereby improving the efficiency of heat exchange and allowing heat to be transferred more quickly from the battery core 3 to the coolant inside the heat exchange tube 8. This shape is also more conducive to heat conduction within the heat exchange tube 8, reducing thermal resistance during heat transfer and allowing the heat generated by the battery to be carried away by the coolant more efficiently, further enhancing the heat dissipation effect and ensuring that the battery operates at a suitable temperature.

[0021] The number of heat exchange tubes 8 within the gap 4 is at least three, and the multiple heat exchange tubes 8 are arranged vertically in sequence. The vertical arrangement of multiple heat exchange tubes 8 can form a denser heat dissipation structure in the gap 4 between the battery cores 3, significantly increasing the heat exchange area with the battery cores 3. More heat exchange tubes 8 can simultaneously transfer heat with the battery cores 3, accelerating the transfer of heat from the battery cores 3 to the coolant in the heat exchange tubes 8, significantly improving heat dissipation efficiency, more effectively controlling the battery temperature, and avoiding problems such as performance degradation or thermal runaway caused by overheating.

[0022] 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 straight-tube heat dissipation structure, characterized in that, include: The outer shell (1) has an end cap (2) on its top. The outer shell (1) has two battery cores (3) inside. The two battery cores (3) are arranged horizontally in sequence, and there is a gap (4) between the two battery cores (3). There is a gap (5) between the two battery cores (3) and the left and right inner walls of the outer shell (1). The end cap (2) has two pole posts (6) symmetrically arranged. Each pole post (6) extends into the outer shell (1) through a rivet (7) and contacts the battery core (3). Multiple rivets (7) on the same pole post (6) are provided with busbars (14) between them and the battery core (3). Each pole post (6) is provided with an insulating component one (10) between it and the end cap (2). The rivets (7) and busbars (14) are provided with an insulating component two (13) between them and the end cap (2). The outer shell (1) has a cooling assembly for cooling down a single battery core (3).

2. The square battery with a straight-tube heat dissipation structure according to claim 1, characterized in that: The cooling assembly includes multiple heat exchange tubes (8) disposed between each gap (4). A liquid exchange unit is provided outside the outer shell (1). Two manifolds (9) are provided inside the outer shell (1). The two manifolds (9) are symmetrically disposed in the left and right end gaps (5) between the battery core (3) 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 (4) are respectively connected to the corresponding manifolds (9). Each manifold (9) extends upward to the outside of the end cap (2). The multiple manifolds (9) are connected to the liquid exchange unit. Each manifold (9) has a baffle (12) at the bottom. The baffle (12) is located between the manifold (9) and the inner wall of the outer shell (1).

3. The square battery with a straight-tube heat dissipation structure according to claim 2, characterized in that: Each of the heat exchange tubes (8) has a flat, straight groove shape in cross-section.

4. The square battery with a straight-tube heat dissipation structure according to claim 2, characterized in that: The number of heat exchange tubes (8) in the gap (4) is at least three, and the multiple heat exchange tubes (8) are arranged vertically in sequence.

5. The square battery with a straight-tube heat dissipation structure according to claim 1, characterized in that: An explosion-proof valve (11) is provided on the end cap (2).

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