Battery Cells, Battery Packs, and Vehicles

Abstract

A battery cell (1), a battery pack (2), and a vehicle (4). The battery cell (1) is a housing (100) having an inner cavity (110) and a first side wall (120) and a second side wall (130), the second side wall (130) being provided with an explosion-proof hole (131), the second side wall (130) supporting a first bottom support (500) and a second bottom support (600), the first bottom support (500) and the second bottom support (600) being supported by a first bottom support (500) and a second bottom support (600). The housing (100) includes a terminal post (200) disposed in a side wall of the housing (100) other than the second side wall (130) and an explosion-proof valve (300) used to cover the explosion-proof hole (131). The first bottom support (500) and the second bottom support (600) together support the electrode core (400) such that the electrode core (400) is disposed at a distance from the explosion-proof hole (131).

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese Patent Application No. 202221130465.5, entitled “BATTERY CELL, BATTERY PACK AND VEHICLE,” filed by BYD on May 12, 2022.

[0002] Technical Field The present disclosure relates to the technical field of vehicles, and more particularly, to a battery cell, a battery pack, and a vehicle. [Background technology]

[0003] In the prior art, the terminal posts of the battery cells and the explosion-proof valves are generally located at the same end. When the battery cells undergo thermal runaway, the high-temperature gas or flames that are emitted can easily burn the terminal posts of the battery cells and the devices connected to the battery cells, causing high-voltage arc discharge or secondary damage.

[0004] In addition, a support plate is disposed inside the housing of the battery cell to support the terminal post of the battery cell. A through hole is often provided in the support plate to communicate the inner cavity of the battery cell with the explosion-proof valve. However, since the cross-sectional area of ​​the through hole of the support plate is small, the gas flow between the through hole and the explosion-proof valve is not smooth enough, and the through hole is easily blocked, so that the gas inside the battery cell cannot flow normally to the outside, resulting in poor explosion prevention and exhaust effect. Summary of the Invention [Means for solving the problem]

[0005] The present disclosure aims to solve at least one of the technical problems in the prior art. To this end, the present disclosure aims to provide a battery cell, which has the advantages of high safety, smooth gas flow, and good explosion-proof effect.

[0006] The present disclosure further provides a battery pack having a battery cell.

[0007] The present disclosure further provides a vehicle having a battery pack.

[0008] According to one embodiment of the first aspect of the present disclosure, a battery cell includes a housing having an inner cavity and a first sidewall and a second sidewall opposed to each other, the second sidewall being provided with an explosion-proof hole, and a first bottom support and a second bottom support, the first bottom support and the second bottom support being disposed within the inner cavity, the second sidewall supporting the first bottom support and the second bottom support being spaced apart from the second bottom support, the first bottom support and the second bottom support defining a first gas channel, and the explosion-proof hole being provided in the housing. The housing includes a first bottom support and a second bottom support, the holes of which communicate with the lumen through the first gas channel; a terminal post, the terminal post being disposed on a side wall of the housing other than the second side wall; an explosion-proof valve, the explosion-proof valve being attached to the second side wall, the explosion-proof valve being configured to cover the explosion-proof hole; and an electrode core, the electrode core being disposed within the lumen and connected to the terminal post, the first bottom support and the second bottom support together supporting the electrode core such that the electrode core is spaced from the explosion-proof hole.

[0009] The battery cell according to the embodiment of the present disclosure has the advantages of high safety, smooth gas flow, and good explosion-proof effect.

[0010] According to some exemplary embodiments of the present disclosure, at least one side of the first bottom support and the second bottom support facing the second sidewall is configured with a second gas channel, the second gas channel being in communication with the first gas channel, and at least one of the first bottom support and the second bottom support is provided with a plurality of exhaust holes, and the second gas channel is in communication with the inner cavity through the plurality of exhaust holes.

[0011] According to some exemplary embodiments of the present disclosure, at least one side of the first bottom support and the second bottom support facing the second sidewall is comprised of a plurality of support ribs, and a second gas channel is defined between two adjacent support ribs.

[0012] According to some exemplary embodiments of the present disclosure, each of the support ribs has a height in the range of 0.5 mm to 3 mm.

[0013] According to some exemplary embodiments of the present disclosure, the first gas channel extends along a direction perpendicular to the second sidewall, and the second gas channel extends along a length of the second sidewall.

[0014] According to some exemplary embodiments of the present disclosure, a dimension of the electrode core in the length direction of the second side wall is L1, and a length of each of the first bottom support and the second bottom support is L2, where L1 and L2 satisfy 0.04≦L2 / L1≦0.45.

[0015] According to some exemplary embodiments of the present disclosure, L1 and L2 further satisfy L1≦500 mm, and L2≧20 mm.

[0016] According to some exemplary embodiments of the present disclosure, the first bottom support includes a first side plate and a first bottom plate connected to each other. The first bottom plate is connected to the second side wall, and the first bottom plate extends along the length of the second side wall. One end of the first side plate is connected to the first bottom plate, and the other end of the first side plate is connected to one end of the first side wall. The second bottom support includes a second side plate and a second bottom plate connected to each other. The second bottom plate is connected to the second side wall, and the second bottom plate extends along the length of the second side wall. One end of the second side plate is connected to the second bottom plate, and the other end of the second side plate is connected to the other end of the first side wall. The first bottom plate is spaced apart from the second bottom plate, and the first bottom plate and the second bottom plate define a first gas channel.

[0017] According to some exemplary embodiments of the present disclosure, a first reinforcing rib is disposed on a side of the first side plate facing the electrode core, the first reinforcing rib extending along a length of the first side plate, and a second reinforcing rib is disposed on a side of the second side plate facing the electrode core, the second reinforcing rib extending along a length of the second side plate.

[0018] According to some exemplary embodiments of the present disclosure, the first side panel is parallel to the second side panel and perpendicular to the second side panel.

[0019] According to some exemplary embodiments of the present disclosure, a first side plate is connected to an end of the first side wall through an insulating spacer ring, and a second side plate is connected to the other end of the first side wall through an insulating spacer ring. A first limiting protrusion and a second limiting protrusion are disposed on a side of the insulating spacer ring facing the inner cavity. The first side plate abuts against a side of the first limiting protrusion opposite the second limiting protrusion. The second side plate abuts against a side of the second limiting protrusion opposite the first limiting protrusion.

[0020] According to some exemplary embodiments of the present disclosure, the explosion-proof hole is located at the center of the electrode core in the thickness direction and / or the explosion-proof hole is located at the center of the electrode core in the length direction of the second side wall.

[0021] According to some exemplary embodiments of the present disclosure, the battery cell further includes an insulating film, the insulating film being disposed on a side of the explosion-proof valve facing the lumen.

[0022] According to some exemplary embodiments of the present disclosure, the terminal post is disposed on the first sidewall.

[0023] According to some exemplary embodiments of the present disclosure, the terminal post includes a positive terminal post and a negative terminal post, the housing is an aluminum housing, the positive terminal post is electrically connected to the housing, and the difference between the voltage of the positive terminal post and the voltage of the housing is greater than or equal to 0V and less than or equal to 2.5V.

[0024] According to some exemplary embodiments of the present disclosure, the terminal post includes a positive terminal post and a negative terminal post, the housing is a steel housing, the negative terminal post is electrically connected to the housing, and the difference between the voltage of the housing and the voltage of the negative terminal post is greater than or equal to 0V and less than or equal to 2.5V.

[0025] According to certain exemplary embodiments of the present disclosure, the housing includes a housing body, where a second side wall and a cavity are formed in the housing body, and where the housing body is provided with an opening facing the second side wall, the opening communicating with the cavity, and a housing cover, where the housing cover is attached to the housing body and covers the cavity, where a first side wall is formed in the housing cover, and where a terminal post is connected to the housing cover.

[0026] According to an embodiment of the second aspect of the present disclosure, a battery pack includes a box and a battery cell according to an embodiment of the first aspect of the present disclosure, wherein the battery cell is mounted within the box with the explosion-proof valve facing a bottom wall of the box.

[0027] The battery pack according to the embodiment of the second aspect of the present disclosure has the advantages of high safety, smooth gas flow, and good explosion-proof effect by using the battery cell according to the embodiment of the first aspect of the present disclosure.

[0028] According to an embodiment of the third aspect of the present disclosure, a vehicle includes a battery cell according to an embodiment of the first aspect of the present disclosure or a battery pack according to an embodiment of the second aspect of the present disclosure, and the first side wall is located above the second side wall.

[0029] A vehicle according to an embodiment of the third aspect of the present disclosure has the advantages of high safety, smooth gas flow, and good explosion-proof effect by using a battery cell according to an embodiment of the first aspect of the present disclosure or a battery pack according to an embodiment of the second aspect of the present disclosure.

[0030] Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

[0031] The above and / or other additional aspects and advantages of the present disclosure will become apparent and understandable from the following description of the embodiments in conjunction with the accompanying drawings. [Brief description of the drawings]

[0032] [Figure 1] FIG. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view of a battery cell according to one embodiment of the present disclosure. [Diagram 3] FIG. 3 is an enlarged view of part A in FIG. 2. [Figure 4] FIG. 2 is a schematic structural diagram of a first bottom support, a second bottom support, and a housing cover according to an embodiment of the present disclosure; [Diagram 5] FIG. 13 is a schematic structural diagram of a first bottom support, a second bottom support, and a housing cover viewed from another perspective according to an embodiment of the present disclosure. [Figure 6] FIG. 2 is a schematic structural diagram of a second bottom support of a battery cell according to an embodiment of the present disclosure. [Figure 7] FIG. 13 is a schematic structural diagram of a second bottom support of a battery cell according to an embodiment of the present disclosure seen from another perspective. [Figure 8] FIG. 1 is a schematic diagram of a battery pack according to one embodiment of the present disclosure. [Figure 9] 1 is a schematic diagram of a vehicle according to one embodiment of the present disclosure. [Figure 10] 2 is a schematic diagram of a vehicle according to another embodiment of the present disclosure. [Explanation of symbols]

[0033] 1 Battery Cell 100 Housing 110 Lumen 120 First side wall 121 First limiting protrusion 122 Second limiting protrusion 130 Second Side Wall 131 Explosion proof hole 140 Housing body 150 housing cover 200 Terminal Post 210 Positive terminal post 220 Negative terminal post 300 Explosion-proof valve 400 Electrode Core 500 First Bottom Support 510 First Gas Channel 520 Second Gas Channel 530 Exhaust Vent 540 Support Rib 550 First side panel 551 First Reinforcing Rib 560 First Base Plate 600 Second Bottom Support 610 Second side panel 611 Second Reinforcing Rib 620 Second base plate 700 Insulating Film 800 Insulating Spacer Ring 2 Battery pack 3. Box 4 Vehicles DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are illustrated in the drawings, in which the same or similar elements, or elements having the same or similar functions, are designated with the same or similar reference numerals throughout the description. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to illustrate the present disclosure, and cannot be construed as limiting the present disclosure.

[0035] In describing this disclosure, it will be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "interior," "exterior," and other terms indicate orientations or positions based on the orientations or positions depicted in the drawings and are provided merely for ease or brevity of describing the disclosure, but do not necessarily mean or imply that the depicted devices or components are provided or constructed or operated in the specified orientation. Thus, such terms should not be construed as limiting the disclosure.

[0036] It is to be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply a relative importance or quantity of the depicted technical features. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include one or more features. Furthermore, in the description of this disclosure, unless otherwise specified, "plurality" means two or more.

[0037] A battery cell 1 according to an embodiment of the present disclosure will now be described with reference to the accompanying drawings.

[0038] As shown in Figures 1 to 7, a battery cell 1 according to an embodiment of the present disclosure includes a housing 100, a first bottom support 500, a second bottom support 600, a terminal post 200, an explosion-proof valve 300, and an electrode core 400.

[0039] The housing 100 has a cavity 110 and a first side wall 120 and a second side wall 130 opposed to each other. The second side wall 130 is provided with an explosion-proof hole 131. The first bottom support 500 and the second bottom support 600 are disposed in the cavity 110. The second side wall 130 supports the first bottom support 500 and the second bottom support 600. The first bottom support 500 is spaced apart from the second bottom support 600, and the first bottom support 500 and the second bottom support 600 define a first gas channel 510. The explosion-proof hole 131 communicates with the cavity 110 through the first gas channel 510. The terminal post 200 is disposed in a side wall of the housing 100 other than the second side wall 130. The explosion-proof valve 300 is attached to the second side wall 130, and the explosion-proof valve 300 is configured to cover the explosion-proof hole 131. The electrode core 400 is disposed within the inner cavity 110 and connected to the terminal post 200. The first bottom support 500 and the second bottom support 600 together support the electrode core 400 such that the electrode core 400 is spaced apart from the explosion-proof hole 131.

[0040] The explosion-proof valve 300 has an explosion value. When the pressure in the cavity 110 of the battery cell 1 is less than the explosion value of the explosion-proof valve 300, the battery is in a normal working state. When the pressure in the cavity 110 is equal to or greater than the explosion value of the explosion-proof valve 300, the explosion-proof valve 300 opens, and gas is rapidly released, rapidly reducing the pressure in the cavity 110, and preventing the explosion of the battery cell 1. At this time, the explosion-proof valve 300 plays the role of explosion prevention.

[0041] In the battery cell 1 according to the embodiment of the present disclosure, the housing 100 is provided with a cavity 110 and a first side wall 120 and a second side wall 130 facing each other, the terminal post 200 is disposed on a side wall of the housing 100 other than the second side wall 130, the second side wall 130 is provided with an explosion-proof hole 131, the explosion-proof valve 300 is attached to the second side wall 130 and configured to cover the explosion-proof hole 131, and the electrode core 400 is disposed in the cavity 110 and connected to the terminal post 200. Since the terminal post 200 and the explosion-proof hole 131 are disposed on different walls of the housing 100, respectively, the terminal post 200 is separated from the explosion-proof hole 131. When the battery cell 1 experiences thermal runaway, the high-temperature gas or flame spewing from the explosion-proof hole 131 does not burn the terminal post 200, thereby avoiding secondary damage and providing high safety performance. In addition, the electrode core 400 is disposed in the housing 100 and is separated from the explosion-proof hole 131. Therefore, the electrode core 400 does not block the explosion-proof hole 131, and the gas in the first gas channel 510 communicates with the outside through the explosion-proof hole 131.

[0042] Also, the first bottom support 500 and the second bottom support 600 are disposed in the cavity 110, and the second side wall 130 supports the first bottom support 500 and the second bottom support 600. That is, in the embodiment of the present disclosure, there is no need to change the previous structure of the housing 100 of the battery cell 1, and the first bottom support 500 and the second bottom support 600 are attached in the cavity 110 of the housing 100 as additional components. Therefore, the structure of the housing 100 remains unchanged, and the processing difficulty of the housing 100 is reduced.

[0043] Furthermore, the first bottom support 500 and the second bottom support 600 can support the electrode core 400 such that the electrode core 400 is separated from the second side wall 130 and the electrode core 400 is separated from the explosion-proof hole 131. As a result, the electrode core 400 does not block the explosion-proof hole 131 of the second side wall 130, and when the explosion-proof valve 300 is opened, the flow of gas through the explosion-proof hole 131 becomes extremely smooth.

[0044] Additionally, the first bottom support 500 and the second bottom support 600 are spaced apart to define a first gas channel 510 through which the explosion-proof hole 131 communicates with the lumen 110 .

[0045] Since the explosion-proof valve 300 is disposed on the second side wall 130 on the side different from the terminal post 200, the space between the electrode core 400 and the second side wall 130 is small, and the gas generated in the electrode core 400 cannot be stored. If the first bottom support 500 and the second bottom support 600 are not disposed to form the first gas channel 510, the gas generated in the electrode core 400 will move to the space between the electrode core 400 and the first side wall 120. Therefore, when the pressure in the cavity 110 reaches the explosion value of the explosion-proof valve 300, the gas in the cavity 110 cannot be quickly exhausted through the explosion-proof hole 131, which is very dangerous.

[0046] In the present disclosure, by arranging the first bottom support 500 and the second bottom support 600 to form a first gas channel 510 for storing the gas generated in the electrode core 400, when the pressure in the inner cavity 110 reaches the explosion value of the explosion-proof valve 300, the explosion-proof valve 300 is opened, and the first gas channel 510 communicates with the outside through the explosion-proof hole 160. This allows the gas in the battery cell 1 to be quickly exhausted through the explosion-proof hole 131, so that the gas flows smoothly and the gas is freely exhausted, and the explosion-proof effect is good.

[0047] Therefore, the battery cell 1 according to the embodiment of the present disclosure has the advantages of high safety, smooth gas flow, and good explosion-proof effect.

[0048] In some specific embodiments of the present disclosure, the terminal post 200 is disposed on the first side wall 120, and the explosion-proof hole 131 is disposed on the second side wall 130. That is, the terminal post 200 and the explosion-proof hole 131 are disposed on two opposite sides of the housing 100. In this way, the terminal post 200 and the explosion-proof hole 131 are sufficiently separated, and the distance between the terminal post 200 and the explosion-proof hole 131 is large. When the battery cell 1 experiences thermal runaway, the high-temperature gas or flame spewing from the explosion-proof hole 131 will not burn the terminal post 200, effectively avoiding secondary damage and providing high safety performance. Furthermore, the electrode core 400 does not block the explosion-proof hole 131, and the gas in the first gas channel 510 communicates with the outside through the explosion-proof hole 131.

[0049] 2-7, at least one side of the first bottom support 500 and the second bottom support 600 facing the second sidewall 130 is configured with a second gas channel 520, which communicates with the first gas channel 510. At least one of the first bottom support 500 and the second bottom support 600 is provided with a plurality of exhaust holes 530, and the second gas channel 520 communicates with the lumen 110 through the plurality of exhaust holes 530.

[0050] The second gas channel 520 can also be configured to store the gas generated in the electrode core 400 and reduce the volume of the first gas channel 510. In this way, the lumen 110 can have a large space to place the electrode core 400 so as to ensure the energy density of the battery cell 1. The first bottom support 500 may be configured with the second gas channel 520 and the exhaust hole 530, and the second bottom support 600 may not be configured with the second gas channel 520 and the exhaust hole 530. Alternatively, the first bottom support 500 may not be configured with the second gas channel 520 and the exhaust hole 530, and the second bottom support 600 may be configured with the second gas channel 520 and the exhaust hole 530. Alternatively, both the first bottom support 500 and the second bottom support 600 are configured with the second gas channel 520 and the exhaust hole 530.

[0051] It can be seen that the electrode core 400 of the battery cell 1 generates gas. In the length direction of the second side wall 130, the gas generated in the part of the electrode core 400 corresponding to the first gas channel 510 can flow directly to the explosion-proof hole 131 through the first gas channel 510, the gas generated in the part of the electrode core 400 abutting the first bottom support 500 can flow to the first gas channel 510 and the explosion-proof hole 131 through a plurality of exhaust holes 530 on the first bottom support 500 and the second gas channel 520, and the gas generated by the part of the electrode core 400 abutting the second bottom support 600 can flow to the first gas channel 510 and the explosion-proof hole 131 through a plurality of exhaust holes 530 on the second bottom support 600 and the second gas channel 520. Therefore, various parts of the electrode core 400 are maintained in communication with the explosion-proof holes 131, which facilitates the flow of gas and further improves the exhaust effect of the battery cell 1, resulting in a good explosion-proof effect.

[0052] In some specific embodiments of the present disclosure, as shown in Figures 6 and 7, at least one side of the first bottom support 500 and the second bottom support 600 facing the second sidewall 130 is comprised of a plurality of support ribs 540, and the second gas channel 520 is defined between two adjacent support ribs 540.

[0053] The multiple support ribs 540 can increase the thickness of the first bottom support 500 and the second bottom support 600, so that the structural strength of the first bottom support 500 and the second bottom support 600 is increased, and the first bottom support 500 and the second bottom support 600 can stably support the electrode core 400. The first bottom support 500 and the second bottom support 600 can stably separate the electrode core 400 from the explosion-proof hole 131, and the space of the first gas channel 510 is wider, and the ventilation effect is better.

[0054] Furthermore, by directly defining the second gas channel 520 by the adjacent support rib 540, the structure of the second gas channel 520 is simplified, which in turn simplifies the structures of the first bottom support 500 and the second bottom support 600. The side of the support rib 540 opposite the electrode core 400 may abut against the second sidewall 130 so that the second gas channel 520 is not blocked and gas can flow smoothly.

[0055] In some specific embodiments of the present disclosure, as shown in Figure 2, each support rib 540 has a height in the range of 0.5 mm to 3 mm. For example, the height of each support rib 540 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm.

[0056] Therefore, on the one hand, the support rib 540 can be made high, so that the space of the second gas channel 520 is wide, the second gas channel 520 is not easily blocked, can hold a lot of gas, and can quickly exhaust the gas generated in the electrode core 400 for explosion prevention, the gas flows smoothly, and the explosion prevention effect is good. On the other hand, the support rib 540 cannot be made too high, so that the space occupied by the first bottom support 500 and the second bottom support 600 in the battery cell 1 is not made too wide, so as to avoid a large loss of capacity of the electrode core 400 and ensure the energy density of the battery cell 1.

[0057] In some specific embodiments of the present disclosure, as shown in FIGS. 2 and 4 , the first gas channel 510 extends along a direction perpendicular to the second sidewall 130, and the second gas channel 520 extends along the length of the second sidewall 130.

[0058] The explosion-proof hole 131 may penetrate the second side wall 130 along the thickness direction of the second side wall 130. The extension direction of the first gas channel 510 is parallel to the extension direction of the explosion-proof hole 131. The extension length of the first gas channel 510 may be short, so that the gas flow can flow quickly through the first gas channel 510 and be discharged to the outside of the battery cell 1 through the explosion-proof hole 131. In addition, the second gas channel 520 occupies a small space in the inner cavity 110 in the direction from the first side wall 120 to the second side wall 130. Therefore, the space occupied by the first bottom support 500 and the second bottom support 600 is reduced while ensuring a high-speed flow of gas, thus further avoiding the loss of capacity of the electrode core 400 and ensuring the energy density of the battery cell 1.

[0059] In some specific embodiments of the present disclosure, as shown in Figure 2, the dimension of the electrode core 400 in the length direction of the second side wall 130 is L1, the length of each of the first bottom support 500 and the second bottom support 600 is L2, and L1 and L2 satisfy 0.04 < L2 / L1 < 0.45. For example, L2 / L1 may be 0.04, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, or 0.45.

[0060] In this way, on the one hand, the dimensions of the first bottom support 500 and the second bottom support 600 in the longitudinal direction of the second side wall 130 are avoided from being excessively small, and the first bottom support 500 and the second bottom support 600 can stably support the electrode core 400, thereby preventing the electrode core 400 from sinking and directly contacting the explosion-proof hole 131, ensuring normal flow through the explosion-proof hole 131, and achieving good explosion-proof effect. On the other hand, the longitudinal dimension of the second side wall 130 of the first bottom support 500 and the second bottom support 600 can be avoided from being excessively large, and the longitudinal dimension of the second side wall 130 of the first gas channel 510 can be increased, the first gas channel 510 has a large space, the first bottom support 500 and the second bottom support 600 do not cover the explosion-proof hole 131, the gas can be freely vented, the material for processing the first bottom support 500 and the second bottom support 600 is reduced, the weight of the first bottom support 500 and the second bottom support 600 is reduced, and thus the cost is saved.

[0061] Furthermore, the dimension L1 of the electrode core 400 in the longitudinal direction of the second side wall 130 is 500 mm or less, and the length L2 of each of the first bottom support 500 and the second bottom support 600 is 20 mm or more.

[0062] Therefore, the length of the electrode core 400 is not excessively large, which prevents the overall length of the battery cell 1 from being excessively large, thereby improving the overall structural strength of the battery cell 1. Also, the length of the first bottom support 500 and the length of the second bottom support 600 are not excessively short. Therefore, the length of the first gas channel 510 is kept sufficiently long, which increases the space of the first gas channel 510, which prevents the first gas channel 510 from being blocked, and allows the gas to be discharged smoothly.

[0063] In some specific embodiments of the present disclosure, as shown in Figure 3, the explosion-proof valve 300 is disposed on the side of the second side wall 130 facing the lumen 110 or on the side of the second side wall 130 opposite the lumen 110. The explosion-proof valve 300 can be welded to the second side wall 130.

[0064] For example, the explosion-proof valve 300 is disposed on the side of the second side wall 130 facing the cavity 110. This prevents the explosion-proof valve 300 from protruding from the housing 100, and the housing 100 can protect the explosion-proof valve 300. Alternatively, the explosion-proof valve 300 is disposed on the side of the second side wall 130 opposite the cavity 110. That is, the explosion-proof valve 300 is disposed outside the housing 100. In this case, the assembly space outside the housing 100 becomes wider, and the assembly of the explosion-proof valve 300 to the housing 100 becomes easier.

[0065] In some specific embodiments of the present disclosure, the battery cell 1 further includes a protective sheet (not shown) that is connected to the housing 100 and is located on the side of the explosion-proof valve 300 opposite the lumen 110.

[0066] The protective sheet can shield the explosion-proof valve 300. Whether the explosion-proof valve 300 is attached to the side of the second side wall 130 facing the cavity 110, or whether the explosion-proof valve 300 is disposed on the side of the second side wall 130 opposite to the cavity 110, the protective sheet can prevent other parts of the vehicle 4 from directly contacting the explosion-proof valve 300. In addition, the protective sheet can protect the explosion-proof valve 300 during transportation of the battery cell 1, avoiding damage to the explosion-proof valve 300 due to impact during transportation, and extending the life of the battery cell 1.

[0067] In some particular embodiments of the present disclosure, as shown in FIGS. 6 and 7 , a first bottom support 500 includes a first side plate 550 and a first bottom plate 560 connected to each other, and a second bottom support 600 includes a second side plate 610 and a second bottom plate 620 connected to each other.

[0068] The first bottom plate 560 is connected to the second side wall 130, and the first bottom plate 560 extends along the length direction of the second side wall 130. One end of the first side plate 550 is connected to the first bottom plate 560, and the other end of the first side plate 550 is connected to one end of the first side wall 120. The second bottom plate 620 is connected to the second side wall 130, and the second bottom plate 620 extends along the length direction of the second side wall 130. One end of the second side plate 610 is connected to the second bottom plate 620, and the other end of the second side plate 610 is connected to the other end of the first side wall 120. The first base plate 560 and the second base plate 620 are spaced apart, and the first base plate 560 and the second base plate 620 define a first gas channel 510 .

[0069] In this way, the contact area between the first bottom support 500 and the second bottom support 600 and the sidewall of the lumen 110 is increased, the connection structure is stable and reliable, and the relative position of the first bottom support 500 and the second bottom support 600 to the housing 100 is prevented from changing. By arranging the first side plate 550 and the second side plate 610, two force transmission paths are added between the first side wall 120 and the second side wall 130, which increases the structural strength of the housing 100.

[0070] It should be understood that the other end of the first side plate 550 may be directly or indirectly connected to the first side wall 120. That is, the other end of the first side plate 550 may be directly connected to one end of the first side wall 120, or the first side plate 550 may be connected to one end of the first side wall 120 through an insulating spacer ring 800. Similarly, the other end of the second side plate 610 may be directly or indirectly connected to the first side wall 120. That is, the other end of the second side plate 610 may be directly connected to the other end of the first side wall 120, or the second side plate 610 may be connected to the other end of the first side wall 120 through an insulating spacer ring 800.

[0071] In some specific embodiments of the present disclosure, as shown in Figures 4-6, a first reinforcing rib 551 is disposed on a side of the first side plate 550 facing the electrode core 400, and the first reinforcing rib 551 extends along the length of the first side plate 550. A second reinforcing rib 611 is disposed on a side of the second side plate 610 facing the electrode core 400, and the second reinforcing rib 611 extends along the length of the second side plate 610.

[0072] By arranging the first reinforcing rib 551, the structural strength of the first side plate 550 is improved, the overall structural strength of the first bottom support 500 is increased, and the connection between the first side plate 550 and the first side wall 120 is ensured. By arranging the second reinforcing rib 611, the structural strength of the second side plate 610 is improved, the overall structural strength of the second bottom support 600 is increased, and the connection between the second side plate 610 and the first side wall 120 is ensured. Therefore, the first bottom support 500 and the second bottom support 600 can increase the structural strength of the housing 100.

[0073] In some particular embodiments of the present disclosure, as shown in FIGS. 2 and 4, the first side panel 550 is parallel to the second side panel 610 and perpendicular to the second side wall 130.

[0074] It can be seen that the side walls of the housing 100 connected to the two ends of the second side wall 130 in the length direction are perpendicular to the second side wall 130. That is, both the first side plate 550 and the second side plate 610 are parallel to the side walls connected to the two ends of the second side wall 130 in the length direction. This allows the first side plate 550 and the second side plate 610 to be attached to the side walls of the cavity 110. This allows the first side plate 550 and the second side plate 610 to occupy less space in the cavity 110, and the first side plate 550 and the second side plate 610 to reduce the loss of capacity of the electrode core 400, thereby ensuring the energy density of the battery cell 1.

[0075] In some particular embodiments of the present disclosure, a side of insulating spacer ring 800 facing lumen 110 may be defined by first limiting protrusion 121 and second limiting protrusion 122. First side plate 550 abuts the side of first limiting protrusion 121 opposite second limiting protrusion 122, and second side plate 610 abuts the side of second limiting protrusion 122 opposite first limiting protrusion 121.

[0076] For example, one end of the first side panel 550 opposite the second side wall 130 may be connected to the first limiting protrusion 121 by, but not limited to, a hot melt connection, a snap fit connection, or a pin hole connection. One end of the second side panel 610 opposite the second side wall 130 may be connected to the second limiting protrusion 122 by, but not limited to, a hot melt connection, a snap fit connection, or a pin hole connection.

[0077] In this way, the first limiting protrusion 121 and the second limiting protrusion 122 can limit the first bottom support 500 and the second bottom support 600 in the longitudinal direction of the first side wall 120 to prevent changes in the relative positions of the first side wall 120, the first bottom support 500, and the second bottom support 600, and so that the first bottom support 500 and the second bottom support 600 can stably support the electrode core 400.

[0078] In some specific embodiments of the present disclosure, as shown in FIG. 1 , the explosion-proof hole 131 is located at the center of the thickness direction of the electrode core 400 and / or the explosion-proof hole 131 is located at the center of the electrode core 400 in the length direction of the second side wall 130.

[0079] For example, the explosion-proof hole 131 can be located at the center of the electrode core 400 in the thickness direction and at the center of the electrode core 400 in the length direction of the second side wall 130. Generally, gas is often generated at the center of the electrode core 400. By locating the explosion-proof hole 131 at the center of the electrode core 400, the explosion-proof valve 300 can effectively detect the gas pressure in the battery cell 1. When the gas pressure in the battery cell 1 is excessively high, the explosion-proof valve 300 can be immediately opened to exhaust the gas in the battery cell 1, thereby further improving the explosion-proof effect of the battery cell 1.

[0080] In addition, such an arrangement makes the structure of the housing 100 symmetrical along the length of the second side wall 130, and the housing 100 has the same structural strength at both ends along the length of the second side wall 130. This is beneficial in maintaining the consistency of the structural strength of the housing 100.

[0081] In some particular embodiments of the present disclosure, the battery cell 1 further includes an insulating film 700, which is disposed on a side of the explosion-proof valve 300 facing the lumen 110. For example, the insulating film 700 may be polypropylene (PP), polyethylene (PE), or other polyester compounds.

[0082] In particular, the insulating film 700 is disposed between the explosion-proof valve 300 and the electrode core 400 in the cavity 110. By disposing the insulating film 700, the explosion-proof valve 300 can be isolated from the electrolyte, preventing the explosion-proof valve 300 from corroding due to long-term immersion in the electrolyte, preventing battery leakage, avoiding increases and decreases in the blowing pressure of the explosion-proof valve 300 due to the influence of the electrolyte, and keeping the explosion-proof valve 300 in a stable and reliable operating state.

[0083] In some specific embodiments of the present disclosure, as shown in FIG. 4 and FIG. 5, the terminal post 200 includes a positive terminal post 210 and a negative terminal post 220. The housing 100 is an aluminum housing. In this case, the explosion-proof valve 300 is made of aluminum, the positive terminal post 210 is electrically connected to the housing 100, and the difference between the voltage of the positive terminal post 210 and the voltage of the housing 100 is 0V to 2.5V. The difference between the voltage of the positive terminal post 210 and the voltage of the housing 100 is a value obtained by subtracting the voltage of the housing 100 from the voltage of the positive terminal post 210.

[0084] The housing 100 and the explosion-proof valve 300 can be made of metal aluminum or aluminum alloy, and the electrolyte of the battery cell 1 is usually a lithium-ion electrolyte. Aluminum reacts with lithium ions at low potential to form a metal compound. Therefore, when the voltage difference between the positive terminal post 210 and the housing 100 is small, the voltage of the housing 100 approaches the voltage of the positive terminal post 210, that is, the potential of the housing 100 increases. This prevents the housing 100 and the explosion-proof valve 300 from being corroded by the lithium-ion electrolyte, protects the housing 100 and the explosion-proof valve 300 attached to the housing 100, and therefore further prevents the housing 100 and the explosion-proof valve 300 from being corroded, thereby extending the life of the battery cell 1.

[0085] Also, a resistor is connected between the positive terminal post 210 and the housing 100. Therefore, even if the positive terminal post 210 of the battery cell 1 and the housing 100 form a loop, for example, when the positive terminal post 210 of the battery cell 1 is connected to the negative pole of the battery without a resistor and the housing 100 is connected to the positive pole of the battery, the resistor between the positive terminal post 210 of the battery cell 1 and the housing 100 can protect the battery cell 1 to avoid short circuiting of the battery cell 1, and the battery cell 1 can have high safety performance during use.

[0086] In some specific embodiments of the present disclosure, as shown in FIG. 4 and FIG. 5, the terminal post 200 includes a positive terminal post 210 and a negative terminal post 220. The housing 100 is a steel housing. In this case, the explosion-proof valve 300 may be made of steel. The negative terminal post 220 is electrically connected to the housing 100, and the difference between the voltage of the housing 100 and the voltage of the negative terminal post 220 is 0V to 2.5V. The difference between the voltage of the housing 100 and the voltage of the negative terminal post 220 is a value obtained by subtracting the voltage of the negative terminal post 220 from the voltage of the housing 100.

[0087] It should be understood that steel reacts with lithium ions at high potential to form a metallic compound. When the voltage difference between the negative terminal post 220 and the housing 100 is small, the voltage of the housing 100 approaches the voltage of the negative terminal post 220, i.e., the potential of the housing 100 decreases. This prevents the housing 100 and the explosion-proof valve 300 from being corroded by the lithium ion electrolyte, protects the housing 100 and the explosion-proof valve 300 attached to the housing 100, and therefore further prevents the housing 100 and the explosion-proof valve 300 from being corroded, thereby extending the life of the battery cell 1.

[0088] Also, a resistor is connected between the negative terminal post 220 and the housing 100. Therefore, even if the negative terminal post 220 of the battery cell 1 and the housing 100 form a loop, for example, when the negative terminal post 220 of the battery cell 1 is connected to the positive electrode of the battery without a resistor and the housing 100 is connected to the negative electrode of the battery, the resistor between the negative terminal post 220 of the battery cell 1 and the housing 100 can protect the battery cell 1 to avoid short circuiting of the battery cell 1, and the battery cell 1 can have high safety performance during use.

[0089] In some specific embodiments of the present disclosure, as shown in Figures 1, 2 and 5, the housing 100 includes a housing body 140 and a housing cover 150. The housing 100 may be made of an aluminum alloy.

[0090] The second side wall 130 and the inner cavity 110 are formed in the housing body 140, and the housing body 140 is provided with an opening facing the second side wall 130, and the opening communicates with the inner cavity 110. The housing cover 150 is attached to the housing body 140 and covers the inner cavity 110, the first side wall 120 is formed in the housing cover 150, and the terminal post 200 is connected to the housing cover 150. By configuring the housing 100 to include separate components, the processing difficulty of the housing 100 is reduced, the processing steps of the housing body 140 and the housing cover 150 are simplified, processing is convenient, and it is convenient to put the electrode core 400 and the electrolyte into the inner cavity 110.

[0091] As shown in Fig. 8, a battery pack 2 according to an embodiment of the second aspect of the present disclosure includes a box 3 and a battery cell 1 according to an embodiment of the first aspect of the present disclosure. The battery cell 1 is mounted in the box 3 with an anti-explosion valve 300 facing the bottom wall of the box 3. Therefore, in the event of thermal runaway of the battery cell, hot gas or flame will erupt through the anti-explosion valve 300 to the bottom of the box 3.

[0092] The battery pack 2 according to the embodiment of the present disclosure has the advantages of high safety, smooth gas flow, and good explosion-proof effect by using the battery cell 1 according to the embodiment of the present disclosure.

[0093] As shown in FIG. 9 and FIG. 10, a vehicle 4 according to an embodiment of the third aspect of the present disclosure includes a battery cell 1 according to an embodiment of the first aspect of the present disclosure, or a battery pack 2 according to an embodiment of the second aspect of the present disclosure. The battery pack 2 is attached to the vehicle body of the vehicle 4 or the chassis of the vehicle 4 by a box 3. Alternatively, the vehicle 4 includes a battery cell 1 according to an embodiment of the present disclosure, and the battery cell 1 is attached to the vehicle body of the vehicle 4 or the chassis of the vehicle 4. That is, the battery cell 1 can be directly attached to the vehicle body of the vehicle 4 or the chassis of the vehicle 4. Alternatively, the battery cell 1 is attached to the box 3 and assembled into the battery pack 2, and the battery pack 2 is attached to the vehicle body of the vehicle 4 or the chassis of the vehicle 4 by the box 3.

[0094] The vehicle 4 according to an embodiment of the present disclosure has the advantages of high safety, smooth gas flow, and good explosion-proof effect by using the battery cell 1 according to an embodiment of the present disclosure and the battery pack 2 according to an embodiment of the present disclosure.

[0095] In some particular embodiments of the present disclosure, the battery cell 1 or battery pack 2 is mounted to the vehicle body of the vehicle 4, or to the chassis of the vehicle 4, with the first side wall 120 located above the second side wall 130.

[0096] In particular, the first side wall 120 may face the inside of the vehicle 4, and the second side wall 130 may face the outside of the vehicle 4. That is, the explosion-proof valve 300 may be on the opposite side to the passenger compartment of the vehicle 4. When the battery cell 1 experiences thermal runaway, high-temperature gas or flame can be ejected in the opposite direction to the passenger compartment of the vehicle 4 through the explosion-proof valve 300, thereby preventing the flame from directly ejecting into the vehicle interior, reducing the possibility of injury to the passengers in the vehicle, and further protecting the safety of the passengers in the vehicle.

[0097] Other configurations and operations of the battery cells 1, the battery pack 2, and the vehicle 4 according to embodiments of the present disclosure are known to those skilled in the art and will not be described in detail herein.

[0098] In the description herein, references to terms such as "one embodiment," "some embodiments," "exemplary embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with an embodiment or example are included in at least one embodiment or example of the disclosure. As used herein, exemplary references to such terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0099] While embodiments of the present disclosure have been illustrated and described, it should be understood that those skilled in the art could make various changes, modifications, substitutions, and variations to the embodiments without departing from the principle and spirit of the present disclosure, and the scope of the present disclosure is defined by the appended claims and their equivalents.

Claims

1. A battery cell (1), A housing (100), the housing (100) having an inner cavity (110) and a first side wall (120) and a second side wall (130) opposed to each other, the second side wall (130) being provided with an explosion-proof hole (131); a first bottom support (500) and a second bottom support (600), the first bottom support (500) and the second bottom support (600) being disposed within the cavity (110), the second sidewall (130) supporting the first bottom support (500) and the second bottom support (600), the first bottom support (500) being spaced apart from the second bottom support (600), the first bottom support (500) and the second bottom support (600) defining a first gas channel (510), and the explosion-proof hole (131) communicating with the cavity (110) through the first gas channel (510); a terminal post (200), the terminal post (200) being disposed on a side wall of the housing (100) other than the second side wall (130); an explosion-proof valve (300), the explosion-proof valve (300) being attached to the second side wall (130), the explosion-proof valve (300) being configured to cover the explosion-proof hole (131); an electrode core (400), the electrode core (400) being disposed within the inner cavity (110) and connected to the terminal post (200), the first bottom support (500) and the second bottom support (600) supporting the electrode core (400) together, the electrode core (400) being spaced from the explosion-proof hole (131); A battery cell (1).

2. 2. The battery cell of claim 1, wherein at least one side of the first bottom support (500) and the second bottom support (600) facing the second sidewall (130) is configured with a second gas channel (520) that communicates with the first gas channel, and at least one of the first bottom support (500) and the second bottom support (600) is provided with a plurality of exhaust holes (530), and the second gas channel (520) communicates with the internal cavity (110) through the plurality of exhaust holes (530).

3. 3. The battery cell (1) of claim 2, wherein the side of at least one of the first bottom support (500) and the second bottom support (600) facing the second sidewall (130) is configured with a plurality of support ribs (540), and the second gas channel (520) is defined between two adjacent support ribs (540).

4. The battery cell (1) of claim 3, wherein each support rib (540) has a height in the range of 0.5 mm to 3 mm.

5. 5. The battery cell (1) of claim 2, wherein the first gas channel (510) extends along a direction perpendicular to the second sidewall (130), and the second gas channel (520) extends along a length of the second sidewall (130).

6. The dimension of the electrode core (400) in the length direction of the second side wall (130) is L １ and the length of each of the first bottom support (500) and the second bottom support (600) is L ２ And L １ and L ２ However, 0.04≦L ２ / L １ 6. The battery cell (1) according to claim 1, wherein the battery cell (1) satisfies ≦0.

45.

7. L １ and L ２ But, L １ ≦500 mm, and L ２ The battery cell (1) of claim 6, further satisfying ≧20 mm.

8. the first bottom support (500) comprises a first side panel (550) and a first bottom panel (560) connected to each other, the first bottom panel (560) is connected to the second side wall (130), the first bottom panel (560) extends along the length of the second side wall (130), one end of the first side panel (550) is connected to the first bottom panel (560) and the other end of the first side panel (550) is connected to one end of the first side wall (120); the second bottom support (600) comprises a second side panel (610) and a second bottom panel (620) connected to each other, the second bottom panel (620) is connected to the second side wall (130), the second bottom panel (620) extends along the length of the second side wall (130), one end of the second side panel (610) is connected to the second bottom panel (620) and the other end of the second side panel (610) is connected to the other end of the first side wall (120); 8. The battery cell (1) of claim 1, wherein the first base plate (560) is spaced apart from the second base plate (620), and the first base plate (560) and the second base plate (620) define the first gas channel (51).

9. A first reinforcing rib (551) is disposed on a side of the first side plate (550) facing the electrode core (400), and the first reinforcing rib (551) extends along the length of the first side plate (550); 9. The battery cell (1) of claim 8, wherein a second reinforcing rib (611) is arranged on a side of the second side plate (610) facing the electrode core (400), and the second reinforcing rib (611) extends along the length of the second side plate (610).

10. 10. The battery cell (1) according to claim 8 or 9, wherein the first side plate (550) is parallel to the second side plate (610) and perpendicular to the second side wall (130).

11. the first side plate (550) is connected to one end of the first side wall (120) through an insulating spacer ring (800), and the second side plate (610) is connected to the other end of the first side wall (120) through the insulating spacer ring (800); 11. The battery cell (1) according to claim 8, wherein a first limiting protrusion (121) and a second limiting protrusion (122) are arranged on a side of the insulating spacer ring (800) facing the inner cavity (110), the first side plate (550) abuts against a side of the first limiting protrusion (121) opposite the second limiting protrusion (122), and the second side plate (610) abuts against a side of the second limiting protrusion (122) opposite the first limiting protrusion (121).

12. The explosion-proof hole (131) is located at the center in the thickness direction of the electrode core (400), and / or 12. The battery cell (1) according to any one of claims 1 to 11, wherein the explosion-proof hole (131) is located at the center of the electrode core (400) in the longitudinal direction of the second side wall (130).

13. and an insulating film (700) disposed on a side of the explosion-proof valve (300) facing the lumen (110). A battery cell (1) according to any one of the preceding claims.

14. The battery cell (1) of any one of claims 1 to 13, wherein the terminal post (200) is disposed on the first side wall (120).

15. 15. The battery cell (1) of any one of claims 1 to 14, wherein the terminal post (200) comprises a positive terminal post (210) and a negative terminal post (220), the housing (100) is an aluminum housing, the positive terminal post (210) is electrically connected to the housing (100), and the difference between the voltage of the positive terminal post (210) and the voltage of the housing (100) is greater than or equal to 0 V and less than or equal to 2.5 V.

16. 15. The battery cell (1) of any one of claims 1 to 14, wherein the terminal post (200) comprises a positive terminal post (210) and a negative terminal post (220), the housing (100) is a steel housing, the negative terminal post (220) is electrically connected to the housing (100), and a difference between a voltage of the housing (100) and a voltage of the negative terminal post (220) is greater than or equal to 0 V and less than or equal to 2.5 V.

17. The housing (100) a housing body (140), the second side wall (130) and the inner cavity (110) being formed in the housing body (140), the housing body (140) being provided with an opening facing the second side wall (130), the opening communicating with the inner cavity (110); a housing cover (150), the housing cover (150) being attached to the housing body (140) and covering the inner cavity (110), the first side wall (120) being formed on the housing cover (150), and the terminal post (200) being connected to the housing cover (150); 17. The battery cell (1) according to any one of the preceding claims, comprising:

18. A battery pack (2), Box (3), 18. The battery cell according to claim 1, wherein the battery cell (1) is mounted in the box (3) with the explosion-proof valve (300) facing the bottom wall of the box (3); A battery pack (2).

19. A vehicle (4) comprising a battery cell (1) according to any one of claims 1 to 17 or a battery pack (2) according to claim 18, wherein the first side wall (120) is positioned higher than the second side wall (130).

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