Battery pack

Abstract

The utility model discloses a battery pack which comprises a box body provided with a weakening structure; the battery pack is arranged in the box body and comprises a plurality of battery cells which are arranged in parallel, and anti-explosion valves are arranged on the battery cells; and the guide structure is conducted between the anti-explosion valve and the weakening structure and is used for guiding the flue gas to the weakening structure when the battery cell is subjected to thermal runaway, so that the flue gas bursts through the weakening structure to be discharged from the box body when the pressure of the flue gas is greater than the bearing pressure of the weakening structure. According to the battery pack disclosed by the utility model, the weakening structure is arranged on the upper cover, and the guide structure is arranged in the box body, so that when the battery is subjected to thermal runaway, smoke sprayed from the explosion-proof valve can be guided to the weakening structure through the guide structure, and the high-temperature smoke can break through the weakening structure and is discharged from the upper cover; and the safety of the battery in the use process is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] As the power source of new energy vehicles, power batteries are one of the core components of new energy vehicles. Therefore, the safety performance of power batteries during use has become the focus of people's attention. To ensure the safe use of the battery pack, an explosion-proof valve assembly is usually provided on the upper cover to open the explosion-proof valve assembly with flue gas when the battery undergoes thermal runaway, thereby achieving pressure relief. However, setting the explosion-proof valve assembly on the upper cover will increase the installation cost of the battery pack. Summary of the Utility Model

[0003] To solve at least one of the problems existing in the above-mentioned prior art, according to one aspect of the present utility model, a battery pack is provided, including: a box body provided with a weakening structure; a battery pack disposed in the box body, including a plurality of parallel-connected battery cells, and an explosion-proof valve is provided on the battery cell; a guiding structure is communicated between the explosion-proof valve and the weakening structure, and is used to guide the flue gas to the weakening structure when the battery cell undergoes thermal runaway, so that when the pressure of the flue gas is greater than the bearing pressure of the weakening structure 121, the weakening structure is opened to discharge from the box body.

[0004] In some embodiments, the battery pack further includes a CCS bracket, and a discharge hole is provided in the area of the CCS bracket corresponding to the explosion-proof valve, and the guiding structure is communicated between the discharge hole and the weakening structure.

[0005] In some embodiments, the guiding structure includes a detachable guiding part and a docking part, the guiding part is connected to the CCS bracket, and the docking part is connected to the box body.

[0006] In some embodiments, the guiding part includes a plurality of independently arranged guiding cylinders, one guiding cylinder is provided corresponding to one explosion-proof valve, and the docking part is provided with a plurality of export channels, and one export channel is communicated with the guiding channel of one guiding cylinder.

[0007] In some embodiments, the docking part and the guiding part are connected by plugging.

[0008] In some embodiments, the docking part is sleeved outside a part of the guiding structure.

[0009] In some embodiments, the guiding part and the CCS bracket are integrally provided.

[0010] In some embodiments, the docking part and the box body are integrally provided.

[0011] In some embodiments, the opening area of the docking portion on the side facing the weakening structure is larger than the opening area of the weakening structure.

[0012] In some embodiments, the battery pack includes a plurality of the battery groups and a plurality of the guiding structures. A plurality of weakening structures are provided on the box body. The plurality of battery groups are arranged in parallel and are electrically connected in sequence. An explosion-proof valve of one battery group, one guiding structure, and one weakening structure are arranged in one-to-one correspondence.

[0013] In some embodiments, the weakening structure is a notch formed on the box body.

[0014] In some embodiments, the box body includes an installation box and an upper cover, and the upper cover is provided with the weakening structure.

[0015] In some embodiments, the thickness range of the upper cover is 2.0 mm - 2.5 mm, and the thickness range of the area of the upper cover where the notch is provided is 0.3 mm - 0.5 mm.

[0016] In summary, the battery pack provided by the present utility model has the following technical effects:

[0017] By providing a weakening structure on the upper cover and providing a guiding structure in the box body, when a thermal runaway occurs in the battery cell, the flue gas ejected from the explosion-proof valve can be guided to the weakening structure through the guiding structure. Thus, when the pressure of the high-temperature flue gas is greater than the bearing pressure of the weakening structure, the weakening structure can be broken through and discharged from the upper cover, ensuring the safety of the battery during use. Since no hole is opened on the upper cover and no explosion-proof valve assembly is installed, and the weakening structure is directly formed on the upper cover for pressure relief, the assembly cost of the battery pack is reduced. Description of the Drawings

[0018] Figure 1 is a three-dimensional schematic diagram of the battery pack according to an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 the exploded schematic diagram of the battery pack in

[0020] Figure 3 is Figure 2 the partial cross-sectional schematic diagram of the battery pack in

[0021] Figure 4 is Figure 2 the structural schematic diagram of the installation box and the battery group in

[0022] Figure 5 is Figure 2 the cross-sectional schematic diagram of the upper cover in

[0023] Figure 6 is Figure 1 a schematic structural view of the battery pack after hiding the upper cover in

[0024] Accompanying drawings: 100 - battery pack, 10 - box body, 11 - installation box, 12 - upper cover, 121 - weakening structure, 122 - blocking block, 20 - battery pack, 21 - battery cell, 30 - CCS bracket, 40 - guiding structure, 41 - guiding part, 411 - guiding cylinder, 412 - guiding channel, 42 - docking part, 421 - export channel. Specific embodiments

[0025] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Please refer to Figures 1 to 6 , which is a battery pack 100 provided by an embodiment of the present invention, including a box body 10, a battery pack 20, a CCS bracket 30, and a guiding structure 40.

[0030] Among them, a weakening structure 121 is provided on the box body 10; the battery pack 20 is arranged in the box body 10 and includes a plurality of battery cells 21 arranged in parallel, and an explosion-proof valve is provided on the battery cell 21; the guiding structure 40 is conducted between the explosion-proof valve and the weakening structure 121 and is used to guide the flue gas to the weakening structure 121 when the battery cell 21 undergoes thermal runaway, so that when the pressure of the flue gas is greater than the bearing pressure of the weakening structure 121, the weakening structure 121 is opened to discharge from the box body 10.

[0031] Among them, the box body 10 in this embodiment includes an installation box 11 and an upper cover 12. The upper cover 12 is provided with a weakening structure 121. Since the upper cover 121 corresponds to the end where the explosion-proof valve of the battery pack 20 is located, by setting the weakening structure 121 on the upper cover 121, it is convenient for the guiding structure 40 to be directly docked between the explosion-proof valve and the weakening structure to achieve the conduction between the two.

[0032] For the above battery pack 100, by setting the weakening structure 121 on the upper cover 12 and by setting the guiding structure 40 in the box body 10, when a thermal runaway occurs in the battery cell 21, the flue gas ejected from the explosion-proof valve can be guided to the weakening structure 121 through the guiding structure 40. Thus, when the pressure of the high-temperature flue gas is greater than the bearing pressure of the weakening structure 121, it can break through the weakening structure 121 and be discharged from the upper cover 12, ensuring the safety of the battery during use; since no hole is opened on the upper cover 12 to install the explosion-proof valve assembly and the weakening structure is directly formed on the upper cover 12 for pressure relief, the assembly cost of the battery pack is reduced.

[0033] Further, for example, please refer to Figure 4 , the battery pack of this embodiment further includes a CCS bracket 30. The CCS bracket 30 is arranged on the side of the battery pack 20 facing the upper cover 12, and a discharge hole is provided in the area corresponding to the explosion-proof valve. The guiding structure 40 is conducted between the discharge hole and the weakening structure (121). Thus, when the CCS bracket 30 is arranged on one side of the explosion-proof valve of the battery pack, the guiding structure 40 is conducted between the CCS bracket 30 and the weakening structure. In other embodiments, the CCS bracket 30 can also be arranged on other sides of the battery pack 20.

[0034] Specifically, please refer to Figures 2 to 5 , when the guiding structure 40 is arranged, it includes a detachable guiding part 41 and a docking part 42. The guiding part 41 is connected to the CCS bracket 30, and the docking part 42 is connected to the upper cover 12. In this way, by setting the guiding structure 40 into two parts, it can be respectively connected to the CCS bracket 30 and the upper cover 12, and at the same time, the two are detachably connected to ensure the sealing property when the air flow is guided to the upper cover 12.

[0035] Among them, the guiding part 41 of this embodiment includes a plurality of independently arranged guiding cylinders 411. One guiding cylinder 411 corresponds to one explosion-proof valve. The docking part 42 is provided with a plurality of export channels 421. One export channel 421 communicates with the guiding channel 412 of one guiding cylinder 411. That is, the guiding part 41 includes a plurality of guiding cylinders 411, and the docking part 42 is an integral body. A plurality of export channels 421 are arranged in this integral body. One export channel 421 communicates with one guiding cylinder 411, so as to realize that the flue gas exported by the guiding cylinder 411 enters the export channel 421 of the docking part 42, and then breaks through the weakening structure 121 and flows out from the upper cover 12. In other embodiments, the guiding structure 40 can also be set as an integral structure. A plurality of channels are provided in this integral structure, and the way that one channel corresponds to one explosion-proof valve can also realize the discharge of the flue gas.

[0036] Further, when the guiding part 41 and the docking part 42 are detachably connected, the docking part 42 and the guiding part 41 are inserted and connected. That is, the docking part 42 and the guiding part 41 have overlapping parts. A part of the docking part 42 is located inside the guiding part 41, or a part of the guiding part 41 is located inside the inserted part, so as to ensure the airtightness when the flue gas flows.

[0037] Specifically, when the docking part 42 and the guiding part 41 of this embodiment are in plug-in fit, the docking part 42 is sleeved outside a part of the guiding structure 40. Since the upper cover 12 has greater structural strength relative to the CCS bracket 30, a docking part 42 with greater structural strength and thickness relative to the guiding part 41 can be formed on the upper cover 12. In this way, sleeving the docking part 42 outside the guiding part 41 can facilitate the connection between the docking part 42 and the CCS bracket 30 and ensure the structural strength after the two are inserted.

[0038] Among them, the guiding part 41 of this embodiment and the CCS bracket 30 are integrally arranged, and the docking part 42 and the upper cover 12 are integrally arranged, so as to facilitate the molding of the CCS bracket 30 and the upper cover 12. That is, when the CCS bracket 30 is molded, the guiding part 41 can be molded, and when the upper cover 12 is molded, the docking part 42 can be molded, which is convenient for the rapid assembly of the entire battery pack 100.

[0039] Further, in order to ensure the structural strength of the upper cover 12 after the weakening structure 121 is provided, the opening area of the side of the docking part 42 facing the weakening structure 121 is larger than the opening area of the weakening structure 121, so that not only can the flue gas be discharged to the position where the weakening structure 121 is located, but also the structural strength of the upper cover 12 after the weakening structure 121 is opened can be ensured.

[0040] Please refer to Figure 5, the weakening structure 121 of this embodiment is a notch formed on the upper cover 12, that is, the thickness of the position on the upper cover 12 where the notch is formed is thinner, so that it can be broken relative to the upper cover 12 under the pressure of the flue gas, so as to form an exhaust port on the upper cover 12 to realize the discharge of the flue gas.

[0041] Specifically, the notch of this embodiment is circular, that is, when the notch position is broken, a blocking block 122 is punched out on the upper cover 12, and a discharge port is formed at the position of the blocking block 122, and the flue gas is discharged from the discharge port.

[0042] Among them, the thickness range of the upper cover 12 is 2.0 mm - 2.5 mm, and the thickness range of the area of the upper cover 12 provided with the notch is 0.3 mm - 0.5 mm. In this way, through the notch position set with this thickness, it is avoided that the weakening structure 121 is easily broken relative to the upper cover 12 under the action of external force, and it can be ensured that it can be quickly broken relative to the upper cover 12 under the action of the flue gas, so as to ensure the use safety of the battery pack 100.

[0043] Among them, the thickness of the area of the upper cover 12 provided with the notch can be set to values such as 0.3 mm, 0.4 mm or 0.5 mm, which is not limited here.

[0044] Please refer to Figure 6 , in an embodiment of the present invention, when the battery pack 100 includes a plurality of battery groups 20, the battery pack 100 includes a plurality of guiding structures 40, and a plurality of weakening structures 121 are provided on the upper cover 12. The plurality of battery groups 20 are arranged in parallel and are electrically connected in sequence. The explosion-proof valve of one battery group 20, one guiding structure 40 and one weakening structure 121 are arranged in one-to-one correspondence. Thus, when there are a plurality of battery groups 20 in the battery pack 100, the flue gas of the explosion-proof valve of one battery group 20 can be directly guided to the corresponding guiding structure 20, and the flue gas in the corresponding guiding structure 40 can have sufficient air pressure to quickly break the weakening structure 121, realizing rapid discharge through the weakening structure 121, so as to ensure the use safety of the battery pack 100. In other embodiments, in order to facilitate the formation of the weakening structure 121 on the upper cover 12, it can also be that a plurality of guiding structures 20 are arranged corresponding to one weakening structure 121, and the discharge of the flue gas can also be realized.

[0045] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches are also regarded as the protection scope of the present invention.

Claims

1. Battery pack (100), characterized in that Comprising: A box body (10), the box body (10) is provided with a weakening structure (121); A battery pack (20), arranged in the box body (10), including a plurality of juxtaposed battery cells (21), and an explosion-proof valve is provided on the battery cells (21); A guiding structure (40), communicating between the explosion-proof valve and the weakening structure (121), and is used for guiding the flue gas to the weakening structure (121) when the battery cell (21) has a thermal runaway, so that when the pressure of the flue gas is greater than the bearing pressure of the weakening structure (121), the weakening structure (121) is opened to discharge from the box body (10).

2. The battery pack (100) according to claim 1, characterized in that, The battery pack (100) further includes a CCS bracket (30), and a discharge hole is provided in the area of the CCS bracket (30) corresponding to the explosion-proof valve, and the guiding structure (40) communicates between the discharge hole and the weakening structure (121).

3. The battery pack (100) according to claim 2, characterized in that, The guiding structure (40) includes a detachable guiding part (41) and a docking part (42), the guiding part (41) is connected to the CCS bracket (30), and the docking part (42) is connected to the box body (10).

4. The battery pack (100) according to claim 3, characterized in that, The guiding part (41) includes a plurality of independently arranged guiding cylinders (411), one guiding cylinder (411) corresponds to one explosion-proof valve, and the docking part (42) is provided with a plurality of guiding channels (421), and one guiding channel (421) communicates with the guiding channel (412) of one guiding cylinder (411).

5. The battery pack (100) according to claim 3, wherein, The docking part (42) and the guiding part (41) are connected by plugging.

6. The battery pack (100) according to claim 5, characterized in that, The docking part (42) is sleeved outside a part of the guiding part (41).

7. The battery pack (100) according to any one of claims 2-6, characterized in that, The guiding part (41) and the CCS bracket (30) are integrally arranged.

8. The battery pack (100) according to any one of claims 3-6, characterized in that, The docking part (42) and the box body (10) are integrally arranged.

9. The battery pack (100) according to any one of claims 3-6, characterized in that, The opening area of the side of the docking part (42) facing the weakening structure (121) is larger than the opening area of the weakening structure (121).

10. The battery pack (100) according to any one of claims 1-6, characterized in that, The battery pack (100) includes a plurality of the battery packs (20) and a plurality of the guiding structures (40), a plurality of the weakening structures (121) are provided on the box body (10), the plurality of battery packs (20) are juxtaposed and electrically connected in sequence, and an explosion-proof valve of one battery pack (20), one guiding structure (40) and one weakening structure (121) are arranged in one-to-one correspondence.

11. The battery pack (100) according to any one of claims 1-5, characterized in that, The weakening structure (121) is a notch formed on the box body (10).

12. The battery pack (100) according to claim 11, wherein, The box body (10) includes an installation box (11) and an upper cover (12), and the upper cover (12) is provided with the weakening structure (121).

13. The battery pack (100) according to claim 12, characterized in that, The thickness range of the upper cover (12) is 2.0 mm - 2.5 mm, and the thickness range of the area of the upper cover (12) provided with the notch is 0.3 mm - 0.5 mm.

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