Immersed battery box

Abstract

The invention discloses an immersed battery box which comprises a plurality of module cells mounted on a tray at the bottom of the battery box, a battery box insulating upper cover is arranged above the module cells, and a cell connecting row is arranged between the upper ends of the module cells and the battery box insulating upper cover; the module cells at the head and tail ends of the battery box are respectively connected with a strong current module lead-out connecting bar and a weak current module lead-out connecting bar; a second flow channel arranged on the battery box insulating upper cover, a third flow channel arranged between adjacent module cells and a first flow channel arranged on the battery box bottom tray are communicated in sequence; a new cooling mode, namely a cooling medium full-contact cooling mode, is adopted, the battery cell is mounted on the tray at the bottom of the battery box, and the cooling medium is in full contact with each surface of the battery cell by designing runners at the bottom of the battery box, at the top of the battery box and among the modules, so that the runner design is optimized, and the cooling efficiency is improved. Cooling media between the upper layer and the lower layer of the battery box circulate more smoothly, and the cooling effect is better.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery box structures, and in particular relates to an immersion battery box. Background Art

[0002] A liquid-cooled battery box is a core component of an energy storage / power device that uses a liquid medium (such as coolant, immersion oil, etc.) to circulate, directly or indirectly remove heat from the battery cells, and achieve battery thermal management.

[0003] Traditional liquid-cooled battery boxes have a liquid cooling tube plate at the bottom of the battery cell. The coolant flows indirectly to remove the heat from the battery cell for heat dissipation and temperature control. The heat of the entire battery cell needs to be transferred from the bottom of the battery cell to the liquid cooling tube plate, and then removed by the coolant. The heat conduction efficiency and heat dissipation rate are relatively poor. The cooling medium cannot fully contact every surface of the battery cell, and the heat dissipation efficiency of each surface of the battery cell is inconsistent, which cannot solve the problem of temperature uniformity of the battery cell system. In addition, the strong and weak currents of traditional liquid-cooled battery boxes are on the same side of the battery box, and the weak current is easily interfered with, reducing the stability of communication collection; and the strong and weak currents are located on the same side, which increases the risk of incorrect connection during human operation. Summary of the Invention

[0004] The object of the present invention is to provide an immersion type battery box to overcome the technical problem of poor heat dissipation rate of existing battery boxes.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions: An immersion battery box comprises a battery box bottom tray, a plurality of module cells are mounted on the battery box bottom tray, a battery box insulating upper cover is provided above the plurality of module cells, and an inter-cell connecting row is provided between the plurality of module cells and the battery box insulating upper cover; A strong current module lead-out connection bar is led out from one end of the submerged battery box, and a weak current module lead-out connection bar is led out from the other end of the submerged battery box. The strong current module lead-out connection bar and the weak current module lead-out connection bar are respectively connected to the inter-cell connection bar; A third flow channel is provided between a plurality of adjacent module cells, a first flow channel is provided on the bottom tray of the battery box, and a second flow channel is provided on the insulating upper cover of the battery box. The first flow channel, the second flow channel and the third flow channel are connected in sequence.

[0006] Furthermore, a bakelite support block is provided between the plurality of module cells and the insulating upper cover of the battery box.

[0007] Furthermore, mica sheets are provided between a plurality of adjacent module cells.

[0008] Furthermore, a bottom insulating sheet is provided between the bottom tray of the battery box and the module battery cells.

[0009] Furthermore, a battery box hanging piece is installed on the bottom tray of the battery box.

[0010] Furthermore, reinforcing ribs are installed on the bottom tray of the battery box.

[0011] Furthermore, a battery box handle is installed on one end surface of the bottom tray of the battery box.

[0012] Furthermore, module end plates are respectively provided at the head and tail ends of the plurality of module cells, and the module end plates are mounted on the bottom tray of the battery box; A strong current installation support plate or a weak current installation support plate fixed on the bottom tray of the battery box is provided on the outer side of the module end plate.

[0013] Furthermore, an insulating sheet is provided between the module end plate and the module cell at the end.

[0014] Furthermore, module ties are wrapped around the exterior of the plurality of module cells.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides an immersion battery box, comprising a plurality of module cells mounted on a bottom tray of the battery box, an insulating upper cover of the battery box is arranged above the module cells, and an inter-cell connecting row is arranged between the upper end of the module cells and the insulating upper cover of the battery box; a high-voltage module lead-out connecting row and a low-voltage module lead-out connecting row are respectively connected to the module cells at the head and tail ends of the battery box; a second flow channel opened on the insulating upper cover of the battery box, a third flow channel set between adjacent module cells and a first flow channel opened on the bottom tray of the battery box are connected in sequence; the present invention adopts a new cooling method - a full-contact cooling method of a cooling medium, and the battery cells are mounted on the bottom tray of the battery box, and the first flow channel of the bottom tray of the battery box, the second flow channel of the insulating upper cover of the battery box, and the third flow channel between the module cells are connected to each other, so that the cooling medium is fully in contact with each surface of the battery cell, the flow channel design is optimized, the cooling effect is better, and the heat conduction efficiency and the heat dissipation rate are improved.

[0016] The battery box of the present invention is rationally combined and arranged so that the strong current and weak current of the battery box are respectively located on the front and rear sides of the battery box, which optimizes the traditional battery pack's strong and weak current arrangement on the same side, making the communication signal transmission more stable. Since the high voltage and low voltage are arranged separately, the convenience and safety of personnel operation are optimized.

[0017] Preferably, the module cells and the bottom tray of the battery box are separated by a bottom insulating sheet, an insulating sheet is also provided between the module end plate and the module cells, and a mica sheet is provided between adjacent module cells, thereby improving the electrical safety and reliability of the battery box.

[0018] Preferably, a mounting support plate is provided at the end of the battery box and a module tie is wrapped around it, thereby improving the stability of the overall structure of the battery box.

[0019] Preferably, reinforcing ribs are welded on the bottom tray of the battery box to increase the strength of the bottom tray of the battery box.

[0020] Preferably, battery box lifting parts are welded at the four corners of the battery box bottom tray, and battery box handles are installed on the sides of the battery box bottom tray, so that the battery box lifting and transportation process is more convenient and work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of an immersion battery box in an embodiment of the present invention; Figure 2 This is a schematic diagram of the flow channel of the tray at the bottom of the battery box; Figure 3 This is a schematic diagram of the flow channel of the battery box insulation cover; Figure 4 Schematic diagram of the flow path between module cells.

[0022] Among them, 1. Battery box bottom tray; 2. Battery box lifting parts; 3. Bottom insulation sheet; 4. Module battery cells; 5. Mica sheet; 6. Reinforcement ribs; 7. Battery box handle; 8. Module tie; 9. Module end plate; 10. High-voltage installation support plate; 11. High-voltage module lead-out connection bar; 12. Battery box insulation cover; 13. Inter-cell connection bar; 14. Bakelite support block; 15. Low-voltage installation support plate; 16. First flow channel; 17. Second flow channel; 18. Third flow channel. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] The traditional liquid-cooled battery box is a battery box structure that achieves heat dissipation through liquid media, but only a liquid cooling tube plate is set at the bottom of the battery cell. The coolant indirectly contacts the battery cell through the liquid cooling tube plate. The heat of the entire battery cell needs to be transferred to the cooling tube plate through the bottom of the battery cell and then carried away by the coolant. The heat conduction path is long, the efficiency is low, the heat dissipation rate is slow, and the cooling medium cannot cover the side, top and other areas of the battery cell, resulting in large differences in heat dissipation efficiency on different surfaces of the battery cell. In addition, the traditional liquid-cooled battery box also has the problem of weak electricity being easily interfered with due to the concentration of strong and weak electricity on one side.

[0029] An immersion battery box, such as Figure 1 As shown, it includes a battery box bottom tray 1, module cells 4, strong current module lead-out connection bars 11, weak current module lead-out connection bars, a battery box insulating upper cover 12 and an inter-cell connection bar 13. There are multiple module cells 4, all of which are placed on the battery box bottom tray 1. The battery box insulating upper cover 12 is provided above the module cells 4. The inter-cell connection bar 13 is provided between the upper end of the module cell 4 and the battery box insulating upper cover 12 to achieve electrical connection between adjacent module cells 4. The submerged battery box includes multiple groups of module cells 4, which are arranged in sequence on a tray 1 at the bottom of the battery box. A strong current module lead-out connection bar 11 is connected to one end of the module cell 4 sequence, and correspondingly, a weak current module lead-out connection bar is connected to the other end of the module cell 4 sequence. The strong current module lead-out connection bar 11 and the weak current module lead-out connection bar are electrically connected to the inter-cell connection bar 13, respectively. By optimizing the module arrangement, the strong current of the battery module is gathered on one side of the battery box, and the weak current is gathered on the other side of the strong current. A line outlet method in which strong current and weak current are distributed to both sides of the battery box reduces the weak current easily interfered with by the strong current and weak current of the traditional battery box on the same side, and solves the problem of stability of communication collection. In order to facilitate the heat dissipation of the battery box, Figure 3 As shown, a second flow channel 17 is opened on the battery box insulating cover 12; Figure 2 As shown, a first flow channel 16 is opened on the bottom tray 1 of the battery box; Figure 4 As shown, a third flow channel 18 is provided between adjacent module battery cells 4, wherein the second flow channel 17, the third flow channel 18 and the first flow channel 16 are connected at one time; the present invention designs flow channels at the bottom of the battery box, the top of the battery box and between modules, so that the cooling medium is in full contact with each surface of the battery cell, the flow channel design is optimized, the cooling medium between the upper and lower layers of the battery box flows more smoothly, and the cooling effect is better.

[0030] In an optional embodiment, in order to ensure the insulation of the battery box, a bottom insulating sheet 3 is used to separate the bottom surfaces of the multiple module cells 4 and the bottom tray 1 of the battery box to increase the safety of the module cells 4; in addition, module end plates 9 are respectively provided at the head and tail ends of the multiple module cells 4 arranged in sequence, that is, module end plates 9 are respectively provided on both sides of the battery box, and insulating sheets are also provided between the module end plates 9 and the module cells 4 at the head and tail ends of the battery box; mica sheets 5 are provided between adjacent module cells 4. The mica sheets 5 have excellent insulation properties and high temperature resistance. They are installed between adjacent cells to avoid direct contact between the cell casings and cause short circuits, thereby improving the electrical safety and reliability of the battery box. At the same time, during the operation or transportation of the battery box, the mica sheets 5 can reduce friction and collision between the cells, and avoid safety hazards caused by contact between metal parts.

[0031] In this embodiment, an immersion battery box is provided, including a plurality of module cells 4 mounted on a bottom tray 1 of the battery box, an insulating upper cover 12 of the battery box is provided above the module cells 4, and an inter-cell connecting row 13 is provided between the upper end of the module cells 4 and the insulating upper cover 12 of the battery box, the inter-cell connecting row 13 is provided between adjacent cells to electrically connect the module cells 4, and optionally, the inter-cell connecting row 13 is made of aluminum; the present invention adopts a new cooling method - a full-contact cooling method of the cooling medium, and the module cells 4 are mounted on the bottom tray 1 of the battery box, and the flow channels are designed at the bottom of the battery box, the top of the battery box, and the module cells 4, so that the cooling medium is in full contact with each surface of the cell, and the flow channel design is optimized to make the battery box cooling effect better.

[0032] The module cells 4 at both ends of the battery box are respectively connected with the strong current module lead-out connection row 11 and the weak current module lead-out connection row. The strong current module lead-out connection row 11 and the weak current module lead-out connection row are arranged on opposite sides of the battery box. The strong current module lead-out connection row 11 is fixed to the strong current mounting support plate 10 by bolts, and the strong current mounting support plate 10 is fixed to the bottom tray 1 of the battery box by bolts. Correspondingly, the weak current module lead-out connection row is fixed to the weak current mounting support plate 15 by bolts, and the weak current mounting support plate 15 is fixed to the bottom tray 1 of the battery box by bolts. On the top, the module lead-out connection row is electrically connected to the inter-cell connection row 13 in the module battery cell 4 to form an electrical path inside the module. The other end of the module lead-out connection row is connected to the external component of the battery pack to lead out the electric energy in the battery box and realize energy transmission. The battery box of the present invention is reasonably combined and arranged so that the strong current and weak current of the battery box are respectively located on the front and rear sides of the battery box, which optimizes the traditional battery pack's strong current and weak current arrangement on the same side, making the communication signal transmission more stable. Since the high voltage and low voltage are arranged separately, the convenience and safety of personnel operation are optimized.

[0033] Specifically, a bakelite support block 14 is provided between the upper end of the module battery cell 4 and the insulating upper cover 12 of the battery box. The bakelite support block 14 is installed above the module battery cell 4 to ensure that the insulating upper cover 12 of the battery box is stably covered on the surface of the battery cell module through physical support, thereby avoiding displacement of the insulating upper cover 12 of the battery box due to vibration or external force, and ensuring the integrity of the battery box structure; the bakelite support block 14 can increase the electrical gap between the battery cell and the upper cover, and between the wiring harness and other components, thereby reducing the risk of short circuit.

[0034] Optionally, module end plates 9 are respectively provided at the head and tail ends of the plurality of module cells 4, and the module end plates 9 are mounted on the bottom tray 1 of the battery box by bolts, so as to stably mount the module cells 4 on the bottom tray 1 of the battery box; On the outside of the module end plate 9 are provided a high-current mounting support plate 10 and a low-current mounting support plate 15 fixed to the battery box bottom tray 1. The high-current mounting support plate 10 or the low-current mounting support plate 15 is located at the end of the battery box, adjacent to the module end plate 9, and together constitutes the mechanical fixing structure of the module battery cell 4. The module end plate 9 is connected to the battery box bottom tray 1 by bolts, while the high-current mounting support plate 10 or the low-current mounting support plate 15 provides additional support points for the inter-cell connecting bar 13 to prevent the connecting bar from loosening due to external shaking.

[0035] Optionally, module ties 8 are wrapped around the outside of multiple module cells 4 to tightly fix the cells, connecting bars and other components in the module cells 4 by bundling, to prevent the structure from becoming loose due to shaking during transportation or use, and to ensure the overall stability of the module.

[0036] The present invention provides an immersion battery box, which is assembled by a battery box bottom tray 1, module cells 4, insulating sheets, a battery box insulating cover 12, aluminum busbars, a slave control system, a collection harness, etc. The battery box bottom tray 1 has a reinforcing rib 6 welded at each module cell 4 storage location to increase the strength of the battery box bottom tray 1; An immersion oil flow channel is opened at each module cell channel corresponding to the bottom of the tray 1 at the bottom of the battery box, so that the immersion oil and the cell are in more complete contact, the timeliness of the contact between the oil and the module cell 4 is optimized, and the circulation of the immersion oil is more convenient, so that the heat generated by the cell is more easily exchanged and carried away by the immersion oil, the heat dissipation of the cell will be more timely and the cell temperature will be more balanced; The battery box hoisting parts 2 are welded at the four corners of the tray 1 at the bottom of the battery box for transporting and hoisting the battery box. The four hoisting columns make the hoisting and transporting process of the battery box more convenient, improve the work efficiency of workers, and reduce the labor cost of the enterprise; A bottom insulating sheet 3 is used to separate the module cells 4 from the sheet metal on the surface of the bottom tray 1 of the battery box to avoid direct contact between the sheet metal and the module cells 4 and increase the safety of the module cells 4.

[0037] Each module battery cell 4 is fixed with a module end plate 9, bolts and the bottom tray 1 of the battery box, which is convenient and reliable to operate. The module battery cell 4 is separated from the module end plate 9 by an insulating sheet to improve safety and reliability. The module battery cells 4 are connected by aluminum busbars, and the module battery cells 4 are supported and fixed by bakelite support blocks 14 to the insulating upper cover 12 of the battery box. At the same time, the bakelite support blocks 14 also play the role of fixing the collection harness and simultaneously increasing the electrical safety gap. The production material cost of the product is optimized by adopting a one-material-for-multiple-purpose approach.

[0038] Optionally, the insulating upper cover 12 of the battery box adopts a waist-shaped hole flow channel, and the immersion oil contacts the module battery core 4 more smoothly and conveniently through the flow channel, thereby improving the performance of the product.

[0039] In an optional embodiment, an immersion battery box is provided, including a plurality of module cells 4 mounted on a bottom tray 1 of the battery box, an insulating upper cover 12 of the battery box is provided above the module cells 4, and an inter-cell connecting row 13 is provided between the upper end of the module cells 4 and the insulating upper cover 12 of the battery box, the inter-cell connecting row 13 is provided between adjacent cells to electrically connect the module cells 4, and optionally, the inter-cell connecting row 13 is made of aluminum; the present invention adopts a new cooling method - a full-contact cooling method of the cooling medium, and the module cells 4 are mounted on the bottom tray 1 of the battery box, and the flow channels are designed at the bottom of the battery box, the top of the battery box, and the module cells 4, so that the cooling medium is in full contact with each surface of the cell, and the flow channel design is optimized to make the battery box cooling effect better.

[0040] The module cells 4 at the head and tail ends of the battery box are respectively connected with a strong-electric module lead-out connection row 11 and a weak-electric module lead-out connection row, and the strong-electric module lead-out connection row 11 and the weak-electric module lead-out connection row are arranged on opposite sides of the battery box. The strong-electric module lead-out connection row 11 is fixed to the strong-electric mounting support plate 10 by bolts, and the strong-electric mounting support plate 10 is fixed to the bottom tray 1 of the battery box by bolts. Correspondingly, the weak-electric module lead-out connection row is fixed to the weak-electric mounting support plate 15 by bolts, and the weak-electric mounting support plate 15 is fixed to the bottom tray 1 of the battery box by bolts. The module lead-out connection row is electrically connected to the inter-cell connection row 13 in the module cell 4 to form an electrical path inside the module. The other end of the module lead-out connection row is connected to the external components of the battery pack to lead out the electric energy in the battery box and realize energy transmission; The second flow channel 17 opened on the insulating upper cover 12 of the battery box, the third flow channel 18 provided between adjacent module cells 4 and the first flow channel 16 opened on the bottom tray 1 of the battery box are connected in sequence.

[0041] Optionally, in order to improve the strength of the battery box bottom tray 1, reinforcing ribs 6 are installed on the battery box bottom tray 1; battery box lifting parts 2 are installed at the four corners of the battery box bottom tray 1 for battery box transportation and lifting to improve work efficiency; a battery box handle 7 is also provided at the end of the battery box bottom tray 1 to facilitate the transportation of the battery box.

[0042] The present invention adopts a new cooling method: a cooling medium full-contact cooling method. The module battery cell 4 is installed on the tray 1 at the bottom of the battery box. By designing flow channels at the bottom of the battery box, the top of the battery box, and between the modules, the cooling medium is in full contact with each surface of the battery cell. The flow channel design is optimized, so that the cooling medium between the upper and lower layers of the battery box flows more smoothly and the cooling effect is better.

[0043] Through a rational combination and layout, the high-voltage and low-voltage components of the battery box are located at the front and rear of the box, respectively. This optimizes the traditional arrangement of high-voltage and low-voltage components on the same side of the battery box, making communication signal transmission more stable. The separate arrangement of high-voltage and low-voltage components improves the convenience and safety of personnel operation.

[0044] The battery box of the present invention optimizes the assembly method of the traditional battery box. The sheet metal materials packaged around the battery box are eliminated, which saves material costs and is more conducive to the heat dissipation of the battery cells. The module and the battery box bottom tray 1, the battery box insulating cover 12, and the 4 gaps between the module cells are combined into an immersion oil channel, so that each surface of the battery cell is in more complete contact with the immersion oil, thereby improving the temperature uniformity of each surface of the battery cell.

[0045] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. An immersion battery box, characterized in that: The battery box comprises a bottom tray (1), a plurality of module cells (4) are mounted on the bottom tray (1), a battery box insulating upper cover (12) is provided above the plurality of module cells (4), and an inter-cell connecting row (13) is provided between the plurality of module cells (4) and the battery box insulating upper cover (12); One end of the submerged battery box is connected to a strong current module lead-out connection bar (11), and the other end of the submerged battery box is connected to a weak current module lead-out connection bar, and the strong current module lead-out connection bar (11) and the weak current module lead-out connection bar are respectively connected to the inter-cell connection bar (13); A third flow channel (18) is provided between a plurality of adjacent module cells (4), a first flow channel (16) is provided on the bottom tray (1) of the battery box, and a second flow channel (17) is provided on the insulating upper cover (12) of the battery box, and the second flow channel (17), the third flow channel (18) and the first flow channel (16) are sequentially connected.

2. The submerged battery box according to claim 1, characterized in that: A bakelite support block (14) is also provided between the module battery core (4) and the battery box insulating upper cover (12).

3. The submerged battery box according to claim 2, characterized in that: Mica sheets (5) are provided between adjacent module battery cells (4).

4. The submerged battery box according to claim 1, characterized in that: A bottom insulating sheet (3) is provided between the battery box bottom tray (1) and the module battery core (4).

5. The submerged battery box according to claim 1 or 4, characterized in that: A battery box hanging component (2) is installed on the battery box bottom tray (1).

6. The submerged battery box according to claim 1 or 4, characterized in that: Reinforcing ribs (6) are installed on the bottom tray (1) of the battery box.

7. The submerged battery box according to claim 6, characterized in that: A battery box handle (7) is mounted on one end surface of the battery box bottom tray (1).

8. The submerged battery box according to claim 1, characterized in that: Module end plates (9) are respectively provided at the head and tail ends of the plurality of module cells (4), and the module end plates (9) are mounted on the bottom tray (1) of the battery box; The module end plate (9) is provided with a strong current installation support plate (10) or a weak current installation support plate (15) fixed on the bottom tray (1) of the battery box on the outside.

9. The submerged battery box according to claim 8, characterized in that: An insulating sheet is provided between the module end plate (9) and the module battery core (4) at the end.

10. The submerged battery box according to claim 1, characterized in that: The exterior of the plurality of module battery cells (4) is wrapped with module tie bands (8).

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