Battery pack

Abstract

Disclosed in the present application is a battery pack, comprising: a case, the case being provided with a weakening structure; a battery module disposed in the case and comprising a plurality of battery cells arranged in parallel, wherein each battery cell is provided with an explosion-proof valve; and a guiding structure conducting between each explosion-proof valve and the weakening structure, wherein the guiding structure is configured to guide flue gas to the weakening structure when thermal runaway occurs in a battery cell, such that when the pressure of the flue gas exceeds the bearing capacity of the weakening structure, the weakening structure is burst open to discharge the flue gas from the case.

Description

Battery pack

[0001] This application claims priority to the Chinese patent application No. 202421826027.1 filed on July 29, 2024 with the Chinese Patent Office, the whole content of the above application is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a battery pack. BACKGROUND

[0003] The power battery as the power source of the new energy vehicle is one of the core devices of the new energy vehicle, therefore, the safety performance of the power battery in the use process becomes the focus of people. In order to ensure the use safety of the battery pack, the explosion-proof valve assembly is usually arranged on the upper cover, so that the smoke will flush away the explosion-proof valve assembly when the battery is in thermal runaway, thereby realizing pressure relief. TECHNICAL PROBLEM

[0004] Arranging the explosion-proof valve assembly on the upper cover will increase the installation cost of the battery pack. TECHNICAL SOLUTION

[0005] The present application provides a battery pack, comprising: a box body provided with a weakened structure; a battery pack provided in the box body, comprising a plurality of parallel arranged battery cells, the battery cell is provided with an explosion-proof valve; a guide structure communicated between the explosion-proof valve and the weakened structure, used for guiding the smoke to the weakened structure when the battery cell is in thermal runaway, so that when the pressure of the smoke is greater than the bearing pressure of the weakened structure 121, the weakened structure is flushed away to discharge from the box body. ADVANTAGEOUS EFFECTS

[0006] By arranging the weakened structure on the upper cover, and by arranging the guide structure in the box body, the smoke sprayed from the explosion-proof valve can be guided to the weakened structure through the guide structure when the battery cell is in thermal runaway, so that when the pressure of the high-temperature smoke is greater than the bearing pressure of the weakened structure, the weakened structure can be broken through, and the smoke can be discharged from the upper cover, thereby ensuring the safety of the battery in the use process. Since the hole is not opened on the upper cover and the explosion-proof valve assembly is not installed, the weakened structure is directly formed on the upper cover to relieve pressure, thereby reducing the assembly cost of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0007] Fig. 1 is a perspective view of the battery pack of the present application;

[0008] Fig. 2 is an exploded view of the battery pack in Fig. 1;

[0009] Fig. 3 is another exploded view of the battery pack in Fig. 1;

[0010] Fig. 4 is a partial cross-sectional view of the battery pack in Fig. 1;

[0011] Fig. 5 is a structural view of the mounting box, battery pack and CCS support in Fig. 2;

[0012] Fig. 6 is a cross-sectional view of the upper cover in Fig. 2;

[0013] Fig. 7 is a structural view of the mounting box and battery pack in Fig. 2.

[0014] Fig. 4 is a partial cross-sectional view of the battery pack in Fig. 1; Embodiments of the present application

[0015] The present application will be further described in detail below with reference to the accompanying drawings.

[0016] Referring to Figs. 1-7, the battery pack 100 provided by the embodiments of the present application includes a box body 10, a battery pack 20, a CCS support 30 and a guide structure 40.

[0017] The box body 10 is provided with a weakened structure 121. The battery pack 20 is arranged in the box body 10 and includes a plurality of electric cells 21 arranged side by side. The electric cells 21 are provided with explosion-proof valves 211. The guide structure 40 is connected between the explosion-proof valves 211 and the weakened structure 121. When the electric cells 21 are in thermal runaway, the guide structure 40 guides the smoke to the weakened structure 121. When the pressure of the smoke is greater than the pressure that the weakened structure 121 can withstand, the weakened structure 121 is broken to discharge the smoke from the box body 10.

[0018] In the embodiments, the box body 10 includes a mounting box 11 and an upper cover 12. The upper cover 12 is provided with the weakened structure 121. Since the upper cover 121 corresponds to one end of the battery pack 20 where the explosion-proof valves 211 are located, the weakened structure 121 is arranged on the upper cover 121. In this way, the guide structure 40 can be directly connected between the explosion-proof valves 211 and the weakened structure 121 to realize the connection therebetween.

[0019] The battery pack 100, by setting the weakening structure 121 on the upper cover 12, and by setting the guide structure 40 in the box body 10, when the battery cell 21 is in thermal runaway, the smoke emitted from the explosion-proof valve 211 can be guided by the guide structure 40 to the weakening structure 121, so that when the pressure of the high-temperature smoke is greater than the bearing pressure of the weakening structure 121, the weakening structure 121 can be broken and discharged from the upper cover 12, ensuring the safety of the battery during use; Since the hole is not opened on the upper cover 12 and the explosion-proof valve 211 assembly is installed, the weakening structure is directly formed on the upper cover 12 to release pressure, thereby reducing the assembly cost of the battery pack.

[0020] In some embodiments, for example, see FIGS. 2-5, the battery pack of the present embodiment further comprises a CCS bracket 30, which is arranged on the side of the battery pack 20 facing the upper cover 12, and the area corresponding to the explosion-proof valve 211 is provided with an exhaust hole 31, and the guide structure 40 is communicated between the exhaust hole 31 and the weakening structure 121, so that when the CCS bracket 30 is arranged on the side of the explosion-proof valve 211 of the battery pack, the guide structure 40 is communicated between the CCS bracket 30 and the weakening structure. In other embodiments, the CCS bracket 30 can also be arranged on the other side of the battery pack 20.

[0021] In some embodiments, referring to FIGS. 2-7, the guide structure 40 is arranged to include a detachable guide portion 41 and a docking portion 42, the guide portion 41 is connected to the CCS bracket 30, and the docking portion 42 is connected to the upper cover 12. In this way, by arranging the guide structure 40 in two parts, it can be connected to the CCS bracket 30 and the upper cover 12 respectively, and the two are detachably connected, which ensures the sealing performance when the gas flow is guided to the upper cover 12 after connection.

[0022] In some embodiments, the guide portion 41 of the present embodiment includes a plurality of independently arranged guide cylinders 411, one guide cylinder 411 corresponding to one explosion-proof valve 211, and the docking portion 42 is provided with a plurality of guide channels 421, one guide channel 421 and one guide channel 412 of the guide cylinder 411 are communicated, that is, the guide portion 41 includes a plurality of guide cylinders 411, and the docking portion 42 is an integral whole, and a plurality of guide channels 421 are arranged in the integral whole, one guide channel 421 and one guide cylinder 411 are communicated, so that the smoke guided by the guide cylinder 411 enters the guide channel 421 of the docking portion 42, and then flows out from the upper cover 12 after breaking the weakening structure 121. In other embodiments, the guide structure 40 can also be arranged as an integral structure, and a plurality of channels are arranged in the integral structure, one channel corresponding to one explosion-proof valve 211, which can also achieve the discharge of smoke.

[0023] In some embodiments, the guiding portion 41 and the docking portion 42 are connected by inserting the docking portion 42 into the guiding portion 41, i.e., the docking portion 42 and the guiding portion 41 have a part in common, a part of the docking portion 42 is inserted into the guiding portion 41, or a part of the guiding portion 41 is inserted into the docking portion 42, to ensure the airtightness of the flue gas flow.

[0024] In some embodiments, the docking portion 42 and the guiding portion 41 of the present embodiment are connected by inserting the docking portion 42 into the guiding portion 41, i.e., the docking portion 42 and the guiding portion 41 have a part in common, a part of the docking portion 42 is inserted into the guiding portion 41, or a part of the guiding portion 41 is inserted into the docking portion 42, to ensure the airtightness of the flue gas flow.

[0025] In some embodiments, the guiding portion 41 and the CCS bracket 30 are integrally arranged, and the docking portion 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, i.e., the guiding portion 41 is molded when the CCS bracket 30 is molded, and the docking portion 42 is molded when the upper cover 12 is molded, facilitating the rapid assembly of the entire battery pack 100.

[0026] In some embodiments, in order to ensure the structural strength of the upper cover 12 after the weakening structure 121 is arranged, the opening area of the side of the docking portion 42 facing the weakening structure 121 is greater than the opening area of the weakening structure 121, so as to not only realize the discharge of flue gas to the position of the weakening structure 121, but also ensure the structural strength of the upper cover 12 after the weakening structure 121 is arranged.

[0027] Please refer to FIG. 6, the weakening structure 121 of the present embodiment is a notch formed on the upper cover 12, i.e., the position of the notch on the upper cover 12 is thinner, so as to be broken under the pressure of the flue gas relative to the upper cover 12, to form an exhaust port on the upper cover 12, realizing the discharge of flue gas.

[0028] In some embodiments, the notch of the present embodiment is circular, i.e., when the notch position is broken, a blocking block 122 is punched out on the upper cover 12, the position of the blocking block 122 forms an exhaust port, and the flue gas is discharged from the exhaust port.

[0029] In some embodiments, the thickness of the upper cover 12 is in the range of 2.0-2.5 mm, and the thickness of the area provided with the score line is in the range of 0.3-0.5 mm. In this way, the position of the score line provided by the thickness avoids the weakening structure 121 from being easily broken relative to the upper cover 12 under external force, and also ensures that the weakening structure 121 can be quickly broken relative to the upper cover 12 under the action of the smoke, thereby ensuring the safety of the battery pack 100.

[0030] In some embodiments, the thickness of the area provided with the score line on the upper cover 12 can be set to 0.3 mm, 0.4 mm, or 0.5 mm, etc., and is not limited herein.

[0031] Referring to FIG. 7, in an embodiment of the present application, when the battery pack 100 includes a plurality of battery groups 20, the battery pack 100 includes a plurality of guide structures 40, the upper cover 12 is provided with a plurality of weakening structures 121, the plurality of battery groups 20 are arranged side by side and are sequentially electrically connected, the explosion-proof valve 211 of one battery group 20, one guide structure 40, and one weakening structure 121 are arranged one by one in correspondence, so that when the battery pack 100 is provided with a plurality of battery groups 20, the smoke of the explosion-proof valve 211 of one battery group 20 can be directly guided to the corresponding guide structure 20, and the smoke in the corresponding guide structure 40 can have sufficient air pressure to quickly break the weakening structure 121, thereby achieving rapid discharge through the weakening structure 121, and ensuring the 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, the plurality of guide structures 20 can also be arranged in correspondence with one weakening structure 121, and the discharge of the smoke can also be achieved.

Claims

1. Battery pack (100), including: The housing (10) is provided with a weakening structure (121); A battery pack (20) is located in the housing (10) and includes a plurality of cells (21) arranged in parallel. Each cell (21) is provided with an explosion-proof valve (211). A guide structure (40) is connected between the explosion-proof valve (211) and the weakening structure (121) to guide the flue gas to the weakening structure (121) when the cell (21) experiences thermal runaway, so that when the pressure of the flue gas is greater than the pressure that the weakening structure (121) can withstand, the weakening structure (121) will be opened and discharged from the housing (10).

2. The battery pack (100) according to claim 1, wherein, The battery pack (100) also includes a CCS bracket (30), which has a discharge hole (31) in the area corresponding to the explosion-proof valve, and the guide structure (40) is connected between the discharge hole (31) and the weakening structure (121).

3. The battery pack (100) according to claim 2, wherein, The guide structure (40) includes a detachably connected guide portion (41) and a docking portion (42), the guide portion (41) being connected to the CCS bracket (30) and the docking portion (42) being connected to the housing (10).

4. The battery pack (100) according to claim 3, wherein, The guiding part (41) includes multiple independently arranged guide cylinders (411), one guide cylinder (411) is arranged corresponding to one explosion-proof valve (211), and the docking part (42) is provided with multiple outlet channels (421), one outlet channel (421) is connected to the guide channel (412) of one guide cylinder (411).

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

6. The battery pack (100) according to claim 5, wherein, The docking portion (42) is fitted over part of the guide portion (40).

7. The battery pack (100) according to any one of claims 2-6, wherein, The guide portion (41) and the CCS bracket (30) are integrally formed.

8. The battery pack (100) according to any one of claims 2-6, wherein, The docking part (42) and the box body (10) are integrally formed.

9. The battery pack (100) according to any one of claims 3-6, wherein, The opening area of ​​the docking portion (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, wherein, The battery pack (100) includes multiple battery groups (20) and multiple guide structures (40). The housing (10) is provided with multiple weakening structures (121). The multiple battery groups (20) are arranged in parallel and electrically connected in sequence. The explosion-proof valve (21), the guide structure (40) and the weakening structure (121) of one battery group (20) are arranged in a one-to-one correspondence.

11. The battery pack (100) according to any one of claims 1-5, wherein, The weakening structure (121) is a groove formed on the housing (10).

12. The battery pack (100) according to claim 11, wherein, The housing (10) includes a mounting box (11) and a top cover (12), the top cover (12) being provided with the weakening structure (121).

13. The battery pack (100) according to claim 12, wherein, The thickness of the top cover (12) ranges from 2.0mm to 2.5mm, and the thickness of the area on the top cover (12) with the engraving ranges from 0.3mm to 0.5mm.

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