Thermoelectrically separated CTB cell structure

Abstract

The utility model provides a kind of CTB battery structure of thermoelectric separation belongs to new energy battery field.The structure includes box, battery module, upper cover and heat insulating plate, battery module is set in box, upper cover is covered in box, battery module includes multiple electric core, multiple electric core is arranged side by side, first explosion-proof valve is provided on electric core, heat insulating plate is arranged on battery module along the length direction of battery module, heat insulating plate is provided with two, interval arrangement is arranged in the two sides of first explosion-proof valve, two heat insulating plates and upper cover form exhaust passage between.The utility model embodiment provided can solve the problem of lower safety performance in prior art by a kind of CTB battery structure of thermoelectric separation.

Description

Technical Field

[0001] This utility model relates to the field of new energy batteries, and in particular to a CTB battery structure with thermoelectric separation. Background Technology

[0002] CTB (Cell To Body) technology integrates the battery pack with the chassis, making the battery pack a direct part of the vehicle's structure. This reduces the weight of the battery components while increasing the overall strength of the vehicle. However, due to the reduction in battery components, the requirements for thermal runaway safety of the battery pack need to be further enhanced.

[0003] In existing technologies, battery structures typically employ an open venting scheme. When a cell experiences thermal runaway, the cell's explosion-proof valve bursts open, and the ejected high-temperature gas carries conductive materials from both the positive and negative electrodes. When these conductive materials, along with the high-temperature gas, come into contact with the positive and negative electrodes of multiple cells, it can easily cause short circuits between the cells, leading to secondary safety accidents.

[0004] The existing battery structure uses an open venting scheme, which makes it easy for secondary safety accidents to occur when the cell thermally runs away, resulting in low safety performance. Utility Model Content

[0005] This utility model provides a thermoelectrically separated CTB battery structure, which can solve the problem of low safety performance in the prior art. The technical solution is as follows: A thermoelectrically separated CTB battery structure includes: a housing, a battery module, a top cover, and a heat insulation plate. The battery module is disposed inside the housing, and the top cover is disposed on the housing. The battery module includes multiple battery cells arranged side by side. Each battery cell is provided with a first explosion-proof valve. The heat insulation plate is arranged on the battery module along the length direction of the battery module. There are two heat insulation plates, which are spaced apart on both sides of the first explosion-proof valve. An exhaust channel is formed between the two heat insulation plates and the top cover.

[0006] Optionally, a second explosion-proof valve is provided on the enclosure, and the exhaust channel is connected to the second explosion-proof valve.

[0007] Optionally, the heat insulation board is a silicone foam component, and the top of the heat insulation board abuts against the bottom of the upper cover.

[0008] Optionally, the upper cover is provided with an upwardly protruding reinforcing rib, which is arranged along the length of the battery module.

[0009] Optionally, the reinforcing rib is located directly above the exhaust channel.

[0010] Optionally, a mica sheet is provided at the bottom of the reinforcing rib.

[0011] Optionally, a crossbeam is provided on the top cover, and the crossbeam is perpendicular to the length direction of the battery module.

[0012] Optionally, a sealing ring is provided between the housing and the top cover.

[0013] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following: This utility model provides a thermoelectric separation CTB battery structure. When the battery cell experiences thermal runaway, heat insulation plates are installed on both sides of the first explosion-proof valve, allowing the high-temperature gas generated by the first explosion-proof valve to be discharged through the exhaust channel. This prevents the high-temperature gas from carrying conductive materials and falling onto the positive and negative electrodes on both sides of the first explosion-proof valve, thereby preventing short circuits between battery cells and even secondary safety accidents. This effectively solves the problem of low safety performance in the prior art. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the overall structure after removing the top cover, provided in an embodiment of this utility model; Figure 3 This is provided by the embodiment of the present utility model. Figure 2 A magnified structural diagram at point A; Figure 4 This is a schematic diagram of the fit between the top cover and the battery cell provided in this embodiment of the utility model.

[0016] In the diagram: 1-box body; 11-second explosion-proof valve; 2-battery module; 21-battery cell; 211-first explosion-proof valve; 3-top cover; 31-reinforcing rib; 32-crossbeam; 4-heat insulation board; 5-mica sheet; 6-sealing ring. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model; Figure 2This is a schematic diagram of the overall structure after removing the top cover, provided in an embodiment of this utility model; Figure 3 This is provided by the embodiment of the present utility model. Figure 2 A magnified structural diagram at point A; Figure 4 This is a schematic diagram showing the fit between the top cover and the battery cell according to an embodiment of this utility model. Figures 1 to 4 The CTB battery structure shown includes: a housing 1, a battery module 2, a top cover 3, and a heat insulation plate 4. The battery module 2 is disposed inside the housing 1, and the top cover 3 is disposed on the housing 1. The battery module 2 includes multiple battery cells 21 arranged in parallel. A first explosion-proof valve 211 is disposed on the battery cell 21. The heat insulation plate 4 is arranged on the battery module 2 along the length direction of the battery module 2. Two heat insulation plates 4 are provided and are arranged at intervals on both sides of the first explosion-proof valve 211. An exhaust channel is formed between the two heat insulation plates 4 and the top cover 3.

[0019] Exemplarily, in this embodiment of the present invention, the battery structure adopts a CTB structure, with the upper cover 3 serving as the vehicle floor, formed by hot-formed high-strength steel stamping. The housing 1 and the upper cover 3 are connected by bolts. The first explosion-proof valve 211 is located on top of the battery cell 21, and the cells 21 are filled with aerogel. Multiple battery modules 2 can be arranged side by side inside the housing 1 to increase the total battery capacity of the battery structure. Multiple battery cells 21 are arranged side by side, and the first explosion-proof valves 211 of multiple battery cells 21 are located on the same straight line. By setting heat insulation plates 4 on both sides of the first explosion-proof valve 211, it can be prevented that the conductive substances carried in the high-temperature gas generated by the first explosion-proof valve 211 will short-circuit multiple battery cells 21 in the event of thermal runaway. Short circuits between multiple battery cells 21 may cause secondary explosions of battery cells 21 and other safety accidents. The formed exhaust channel can also prevent the high-temperature gas generated by thermal runaway from causing destructive damage to the surrounding palladium plates, aluminum busbars, copper busbars, and wiring harnesses. On the other hand, the thermal protection of aluminum busbars, copper busbars, and wiring harnesses can be eliminated, reducing production costs.

[0020] This utility model provides a thermoelectric separation CTB battery structure. When the cell 21 experiences thermal runaway, heat insulation plates 4 are installed on both sides of the first explosion-proof valve 211, allowing the high-temperature gas generated by the first explosion-proof valve 211 to be discharged from the exhaust channel. This prevents the high-temperature gas from carrying conductive materials and falling onto the positive and negative electrodes on both sides of the first explosion-proof valve 211, thereby preventing short circuits between the cells 21 and even secondary safety accidents. This effectively solves the problem of low safety performance in the prior art.

[0021] Optionally, a second explosion-proof valve 11 is provided on the housing 1, and the exhaust channel is connected to the second explosion-proof valve 11.

[0022] For example, in this embodiment of the present invention, by setting the second explosion-proof valve 11 to be connected to the exhaust channel, the high-temperature gas generated by the multiple first explosion-proof valves 211 can be guided to be discharged from the battery pack, thereby reducing the temperature inside the housing 1 and preventing secondary safety accidents caused by excessive temperature inside the housing 1. By setting this structure, the safety performance of this battery structure is further improved.

[0023] Optionally, the heat insulation plate 4 is a silicone foam component, and the top of the heat insulation plate 4 abuts against the bottom of the upper cover 3.

[0024] For example, in this embodiment of the invention, the silicone foam has a low density (0.16-0.20 g / cm³). 3 It features high vertical flame retardancy (reaching UL94-V0) and high temperature resistance (-50℃ to 200℃), and its good flame retardant performance can delay the spread of fire when thermal runaway occurs in cell 21. An interference fit can be used between the heat insulation plate 4 and the top cover 3. After the top cover 3 is installed, the foam can be compressed to form a sealing surface, thus making the exhaust channel a sealed channel, preventing high-temperature gas from leaking out from the gap between the heat insulation plate 4 and the top cover 3, thereby further improving the safety performance of this battery structure.

[0025] Optionally, the top cover 3 is provided with an upwardly protruding reinforcing rib 31, which is arranged along the length of the battery module 2.

[0026] For example, in this embodiment of the present invention, the structural strength of the upper cover 3 can be improved by setting the reinforcing rib 31, thereby improving the structural strength of the battery structure.

[0027] Optionally, the reinforcing rib 31 is located directly above the exhaust channel.

[0028] For example, in this embodiment of the present invention, by placing the reinforcing rib 31 directly above the exhaust channel, the reinforcing rib 31 increases the space of the exhaust channel, thereby allowing high-temperature gas to be discharged more smoothly along the exhaust channel, significantly reducing exhaust resistance, and preventing the upper cover 3 from deforming and failing due to excessive instantaneous high-temperature gas produced by the first explosion-proof valve 211 caused by the small space of the exhaust channel. By setting the structure, the safety performance of this battery structure is further improved.

[0029] Optionally, a mica sheet 5 is provided at the bottom of the reinforcing rib 31.

[0030] For example, in this embodiment of the invention, the mica sheet 5 has excellent insulation properties, which can prevent short circuits or leakage. Furthermore, the mica sheet 5 is heat-resistant (up to 600°C or higher), which can block heat transfer between battery cells, preventing the top cover 3 from deforming due to excessive temperature, and avoiding the risk of igniting the passenger compartment floor mat in the event of thermal runaway. By incorporating the mica sheet 5, the risk of thermal runaway can be reduced, thereby further improving the safety performance of this battery structure.

[0031] Optionally, a crossbeam 32 is provided on the top cover 3, and the crossbeam 32 is perpendicular to the length direction of the battery module 2.

[0032] For example, in this embodiment of the present invention, by setting the crossbeam 32, the structural strength of the upper cover 3 can be further improved. At the same time, the crossbeam 32 can also serve as a base for connecting other components inside the vehicle body, such as mounting the vehicle seat or other structures on the crossbeam 32.

[0033] Optionally, a sealing ring 6 is provided between the housing 1 and the top cover 3.

[0034] For example, in this embodiment of the present invention, by providing a sealing ring 6, the sealing performance between the housing 1 and the top cover 3 can be improved, thereby improving the sealing performance of the battery structure.

[0035] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thermoelectrically separated CTB battery structure, characterized in that, include: Box body (1), battery module (2), top cover (3) and heat insulation plate (4). The battery module (2) is installed inside the housing (1), and the top cover (3) is installed on the housing (1). The battery module (2) includes multiple battery cells (21), which are arranged side by side. A first explosion-proof valve (211) is provided on each battery cell (21). The heat insulation plate (4) is arranged on the battery module (2) along the length direction of the battery module (2). There are two heat insulation plates (4), which are arranged at intervals on both sides of the first explosion-proof valve (211). An exhaust channel is formed between the two heat insulation plates (4) and the top cover (3).

2. The thermoelectrically separated CTB battery structure according to claim 1, characterized in that, The housing (1) is provided with a second explosion-proof valve (11), and the exhaust channel is connected to the second explosion-proof valve (11).

3. The thermoelectrically separated CTB battery structure according to claim 1, characterized in that, The heat insulation plate (4) is a silicone foam component, and the top of the heat insulation plate (4) abuts against the bottom of the upper cover (3).

4. The thermoelectrically separated CTB battery structure according to claim 1, characterized in that, The upper cover (3) is provided with an upwardly protruding reinforcing rib (31), which is arranged along the length of the battery module (2).

5. The thermoelectrically separated CTB battery structure according to claim 4, characterized in that, The reinforcing rib (31) is located directly above the exhaust channel.

6. The thermoelectrically separated CTB battery structure according to claim 5, characterized in that, The bottom of the reinforcing rib (31) is provided with a mica sheet (5).

7. The thermoelectrically separated CTB battery structure according to claim 1, characterized in that, A crossbeam (32) is provided on the top cover (3), and the crossbeam (32) is perpendicular to the length direction of the battery module (2).

8. The thermoelectrically separated CTB battery structure according to claim 1, characterized in that, A sealing ring (6) is provided between the box body (1) and the top cover (3).

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