Battery cells, battery packs, and vehicles
The battery cell design addresses poor gas flow and explosion-proofing by separating the terminal post and explosion-proof valve and incorporating gas channels and exhaust holes, enhancing safety and performance.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- BYD CO LTD
- Filing Date
- 2023-05-11
- Publication Date
- 2026-05-26
Smart Images
Figure 0007865680000001 
Figure 0007865680000002 
Figure 0007865680000003
Abstract
Description
Technical Field
[0001] Cross - reference to Related Applications This disclosure claims the priority of Chinese Patent Application No. 202221130465.5, entitled "BATTERY CELL, BATTERY PACK AND VEHICLE", filed by BYD on May 12, 2022.
[0002] Technical Field This disclosure relates to the technical field of vehicles, specifically to battery cells, battery packs, and vehicles.
Background Art
[0003] In the prior art, the terminal post and explosion - proof valve of a battery cell are generally arranged at the same end. When the battery cell undergoes thermal runaway, the ejected high - temperature gas or flame can easily ignite the terminal post of the battery cell and the devices connected to the battery cell, causing high - voltage arc discharge or secondary damage.
[0004] Also, a support plate is arranged inside the housing of the battery cell to support the terminal post of the battery cell. In order to connect the inner cavity of the battery cell and the explosion - proof valve, a through - hole is often provided on the support plate. 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, the through - hole is easily blocked, and the gas inside the battery cell cannot flow out normally. As a result, the explosion - proof and exhaust effects are poor.
Summary of the Invention
Means for Solving the Problems
[0005] This disclosure aims to solve at least one of the technical problems in the prior art. For this purpose, the object of this disclosure is to provide a battery cell. The battery cell has the advantages of high safety, smooth gas flow, and good explosion - proof effect.
[0006] This disclosure further provides a battery pack having battery cells.
[0007] Furthermore, this disclosure provides a vehicle having a battery pack.
[0008] According to one embodiment of a first aspect of the present disclosure, the battery cell comprises a housing having a lumen and a first side wall and a second side wall facing each other, the second side wall of which is 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 positioned within the lumen, the second side wall supporting the first bottom support and the second bottom support, the first bottom support being separated from the second bottom support, and the first bottom support and the second bottom support defining a first gas channel, explosion-proof The housing includes: a first bottom support and a second bottom support, the hole communicating with the lumen through a first gas channel; a terminal post, the terminal post being positioned 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 and configured to cover the explosion-proof hole; and an electrode core, the electrode core being positioned in the lumen and connected to the terminal post, with the first bottom support and the second bottom support jointly supporting the electrode core such that the electrode core is separated from the explosion-proof hole.
[0009] The battery cell according to the embodiments of this disclosure has the advantages of being highly safe, having a smooth gas flow, and having a good explosion-proof effect.
[0010] According to some exemplary embodiments of the present disclosure, the first bottom support and at least one side of the second bottom support facing the second side wall are configured with a second gas channel, the second gas channel communicating 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, the second gas channel communicating with a lumen through the plurality of exhaust holes.
[0011] According to some exemplary embodiments of the present disclosure, the first bottom support facing the second side wall and at least one side of the second bottom support are comprised of a plurality of support ribs, and the second gas channel is defined between two adjacent support ribs.
[0012] According to some exemplary embodiments of this disclosure, each of the support ribs has a height ranging from 0.5 mm to 3 mm.
[0013] According to some exemplary embodiments of the present disclosure, a first gas channel extends along a direction perpendicular to a second sidewall, and a second gas channel extends along the longitudinal direction of the second sidewall.
[0014] According to some exemplary embodiments of the present disclosure, the dimension of the electrode core in the longitudinal direction of the second side wall is L1, the length of the first bottom support and the length of the second bottom support are L2, and L1 and L2 satisfy 0.04 ≤ L2 / L1 ≤ 0.45.
[0015] According to some exemplary embodiments of this 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 a second side wall and extends along the longitudinal direction 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 a second side wall and extends along the longitudinal direction 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 separated from the second bottom plate, and the first and second bottom plates define a first gas channel.
[0017] According to some exemplary embodiments of the present disclosure, a first reinforcing rib is provided on the side surface of a first side plate facing the electrode core, the first reinforcing rib extending along the longitudinal direction of the first side plate. A second reinforcing rib is provided on the side surface of a second side plate facing the electrode core, the second reinforcing rib extending along the longitudinal direction of the second side plate.
[0018] According to some exemplary embodiments of the present disclosure, the first side plate is parallel to the second side plate and perpendicular to the second side wall.
[0019] According to some exemplary embodiments of the present disclosure, a first side plate is connected to the end of a 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 projection and a second limiting projection are positioned on the side of the insulating spacer ring facing the lumen. The first side plate abuts against the side of the first limiting projection opposite to the second limiting projection. The second side plate abuts against the side of the second limiting projection opposite to the first limiting projection.
[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 positioned on the side of the explosion-proof valve facing the lumen.
[0022] According to some exemplary embodiments of the present disclosure, terminal posts are located on the first side wall.
[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 made of aluminum, the positive terminal post is electrically connected to the housing, and the voltage difference between the positive terminal post and 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 0V or more and 2.5V or less.
[0025] According to some exemplary embodiments of the present disclosure, the housing includes a housing body, a second side wall and an inner cavity are formed in the housing body, an opening facing the second side wall is provided in the housing body, and the opening communicates with the inner cavity. The housing body, and a housing cover, the housing cover is attached to the housing body, covers the inner cavity, a first side wall is formed on the housing cover, and the terminal post is connected to the housing cover.
[0026] According to an embodiment of the second aspect of the present disclosure, the battery pack includes a box and a battery cell according to the embodiment of the first aspect of the present disclosure, and the battery cell is mounted in the box with the explosion-proof valve facing the 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, the vehicle includes the battery cell according to the embodiment of the first aspect of the present disclosure, or the battery pack according to the embodiment of the second aspect of the present disclosure, and the first side wall is located above the second side wall.
[0029] The vehicle according to the 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 the battery cell according to the embodiment of the first aspect of the present disclosure, or the battery pack according to the embodiment of the second aspect of the present disclosure.
[0030] Further aspects and advantages of the present disclosure will be given in part in the following description, some of which will become apparent from the following description or will be learned from the practice of the present disclosure.
[0031] The above and / or other additional aspects and advantages of the present disclosure will become clear and understandable from the description of the embodiments related to the accompanying drawings.
Brief Description of the Drawings
[0032] [Figure 1] It is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure. [Figure 2] It is a cross-sectional view of a battery cell according to an embodiment of the present disclosure. [Figure 3] It is an enlarged view of part A in FIG. 2. [Figure 4] It 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. [Figure 5] It 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] It is a schematic structural diagram of a second bottom support of a battery cell according to an embodiment of the present disclosure. [Figure 7] It is a schematic structural diagram of a second bottom support of a battery cell viewed from another perspective according to an embodiment of the present disclosure. [Figure 8] It is a schematic diagram of a battery pack according to an embodiment of the present disclosure. [Figure 9] It is a schematic diagram of a vehicle according to an embodiment of the present disclosure. [Figure 10] It is a schematic diagram of a vehicle according to another embodiment of the present disclosure.
Explanation of Reference Numerals
[0033] 1 Battery cell 100 Housing 110 Lumen 120 First side wall 121 First limiting projection 122 Second limiting projection 130 Second side wall 131 Explosion proof hole 140 Housing Body 150 Housing Cover 200 terminal posts 210 Positive terminal post 220 Negative terminal post 300 Explosion-proof valve 400 electrode cores 500 First bottom support 510 First gas channel 520 Second gas channel 530 Exhaust port 540 Support Ribs 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 Rings 2 Battery Packs 3 boxes 4 Vehicles [Modes for carrying out the invention]
[0034] Embodiments of the present disclosure are described in detail below, and examples of embodiments are shown in the drawings. Throughout the description, the same or similar elements, or elements having the same or similar function, will be denoted by the same or similar reference numerals. The embodiments described below with reference to the accompanying drawings are illustrative and are for illustrative purposes only and should not be construed as limiting the present disclosure.
[0035] In the description of this disclosure, terms such as “center,” “up,” “down,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” “outside,” and other terms are provided solely to indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are intended to facilitate or simplify the description of this disclosure. It should be understood that these terms do not necessarily mean or imply that the devices or components shown are provided in or constructed or operated in the direction specified. Therefore, such terms should not be construed as limiting this disclosure.
[0036] The terms “first” and “second” are used solely for descriptive purposes and should not be interpreted as indicating or implying relative importance or the quantity of the described technical features. Therefore, features limited by “first” or “second” may explicitly or implicitly include one or more features. Furthermore, in this disclosure, unless otherwise specified, “plural” means two or more.
[0037] Hereinafter, a battery cell 1 according to an embodiment of this disclosure will be described with reference to the attached drawings.
[0038] As shown in Figures 1 to 7, the battery cell 1 according to the 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 lumen 110 and two opposing side walls 120 and 130. 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 positioned within the lumen 110. The second side wall 130 supports the first bottom support 500 and the second bottom support 600. The first bottom support 500 is separated 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 lumen 110 through the first gas channel 510. The terminal post 200 is positioned on the side walls 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 is configured to cover the explosion-proof hole 131. The electrode core 400 is placed inside the lumen 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 so that it is separated from the explosion-proof hole 131.
[0040] The explosion-proof valve 300 has an explosion value. When the pressure inside the lumen 110 of the battery cell 1 is less than the explosion value of the explosion-proof valve 300, the battery is in a normal operating state. When the pressure inside the lumen 110 exceeds the explosion value of the explosion-proof valve 300, the explosion-proof valve 300 opens, rapidly releasing gas and rapidly lowering the pressure inside the lumen 110, preventing the battery cell 1 from exploding. At this time, the explosion-proof valve 300 performs its explosion-proof function.
[0041] In the battery cell 1 according to the embodiment of this disclosure, the housing 100 is provided with a lumen 110 and a first side wall 120 and a second side wall 130 facing each other. The terminal post 200 is located on a side wall of the housing 100 other than the second side wall 130, and an explosion-proof hole 131 is provided in the second side wall 130. The explosion-proof valve 300 is attached to the second side wall 130 and configured to cover the explosion-proof hole 131. The electrode core 400 is located inside the lumen 110 and connected to the terminal post 200. Since the terminal post 200 and the explosion-proof hole 131 are located on different walls of the housing 100, the terminal post 200 is spaced away from the explosion-proof hole 131. If the battery cell 1 experiences thermal runaway, the high-temperature gas or flame ejected from the explosion-proof hole 131 will not burn the terminal post 200, thus avoiding secondary damage and providing high safety performance. Furthermore, the electrode core 400 is located inside 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] Furthermore, the first bottom support 500 and the second bottom support 600 are positioned within the lumen 110, and the second side wall 130 supports the first bottom support 500 and the second bottom support 600. In other words, in the embodiments of this disclosure, there is no need to modify 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 installed within the lumen 110 of the housing 100 as additional components. Therefore, the structure of the housing 100 remains unchanged, thus reducing the difficulty of manufacturing the housing 100.
[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 separated from the explosion-proof hole 131. As a result, the electrode core 400 does not block the explosion-proof hole 131 in the second side wall 130, and when the explosion-proof valve 300 is opened, the gas flow through the explosion-proof hole 131 becomes extremely smooth.
[0044] Furthermore, the first bottom support 500 and the second bottom support 600 are separated to define the first gas channel 510, and the explosion-proof hole 131 communicates with the lumen 110 through the first gas channel 510.
[0045] Since the explosion-proof valve 300 is located on the second side wall 130 on a side different from the terminal post 200, the space between the electrode core 400 and the second side wall 130 is small, and gas generated in the electrode core 400 cannot be stored. If the first bottom support 500 and the second bottom support 600 are not positioned to form the first gas channel 510, the gas generated in the electrode core 400 moves into the space between the electrode core 400 and the first side wall 120. Therefore, when the pressure in the lumen 110 reaches the explosion value of the explosion-proof valve 300, the gas in the lumen 110 cannot be quickly exhausted through the explosion-proof hole 131, which is highly dangerous.
[0046] In this disclosure, by arranging a first bottom support 500 and a second bottom support 600 to form a first gas channel 510 for storing gas generated in the electrode core 400, when the pressure inside the lumen 110 reaches the explosion value of the explosion-proof valve 300, the explosion-proof valve 300 opens, and the first gas channel 510 communicates with the outside through the explosion-proof hole 160. This allows the gas inside the battery cell 1 to be quickly discharged from the explosion-proof hole 131, the gas to flow smoothly, the gas to be freely exhausted, and the explosion-proof effect to be improved.
[0047] Therefore, the battery cell 1 according to the embodiment of the present disclosure has the advantages of being highly safe, having a smooth gas flow, and having a good explosion-proof effect.
[0048] In some specific embodiments of this disclosure, the terminal post 200 is located on the first side wall 120, and the explosion-proof hole 131 is located on the second side wall 130. That is, the terminal post 200 and the explosion-proof hole 131 are located on two opposing 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. If the battery cell 1 experiences thermal runaway, the hot gas or flame ejected 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] In some specific embodiments of the present disclosure, as shown in Figures 2 to 7, at least one side of the first bottom support 500 and the second bottom support 600 facing the second side wall 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 may also be configured to store gas generated in the electrode core 400, thereby reducing the volume of the first gas channel 510. In this way, the lumen 110 can have ample space to accommodate the electrode core 400 in order to ensure the energy density of the battery cell 1. The first bottom support 500 may consist of the second gas channel 520 and the exhaust port 530, while the second bottom support 600 may not consist of the second gas channel 520 and the exhaust port 530. Alternatively, the first bottom support 500 and the second bottom support 600 may not consist of the second gas channel 520 and the exhaust port 530, while the second bottom support 600 may consist of the second gas channel 520 and the exhaust port 530. Alternatively, both the first bottom support 500 and the second bottom support 600 may consist of the second gas channel 520 and the exhaust port 530.
[0051] It can be seen that the electrode core 400 of battery cell 1 generates gas. In the longitudinal direction of the second side wall 130, the gas generated in the portion of the electrode core 400 corresponding to the first gas channel 510 can flow directly through the first gas channel 510 to the explosion-proof hole 131, the gas generated in the portion of the electrode core 400 in contact with the first bottom support 500 can flow through the first bottom support 500 and a plurality of exhaust holes 530 on the second gas channel 520 to the first gas channel 510 and the explosion-proof hole 131, and the gas generated by the portion of the electrode core 400 in contact with the second bottom support 600 can flow through the second bottom support 600 and a plurality of exhaust holes 530 on the second gas channel 520 to the first gas channel 510 and the explosion-proof hole 131. Therefore, since various parts of the electrode core 400 are maintained in communication with the explosion-proof holes 131, the gas flow becomes smoother, the exhaust effect of the battery cell 1 is further improved, and the explosion-proof effect is enhanced.
[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 side wall 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, thereby increasing the structural strength of the first bottom support 500 and the second bottom support 600, allowing them to 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, widening the space of the first gas channel 510 and improving the ventilation effect.
[0054] Furthermore, by directly defining the second gas channel 520 with the adjacent support rib 540, the structure of the second gas channel 520 is simplified, which simplifies the structure 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 side wall 130 so that the gas flow is smooth without the second gas channel 520 being blocked.
[0055] In some specific embodiments of this 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 higher, which widens the space of the second gas channel 520, making the second gas channel 520 less likely to be blocked and able to hold a large amount of gas, allowing the gas generated in the electrode core 400 to be quickly exhausted for explosion prevention, the gas to flow smoothly and the explosion prevention effect to be good. On the other hand, the support rib 540 cannot be made excessively high, so the space occupied by the first bottom support 500 and the second bottom support 600 in the battery cell 1 is not made excessively wide, avoiding a large loss of capacity in the electrode core 400 and ensuring the energy density of the battery cell 1.
[0057] In some specific embodiments of the present disclosure, as shown in Figures 2 and 4, the first gas channel 510 extends along a direction perpendicular to the second side wall 130, and the second gas channel 520 extends along the longitudinal direction of the second side wall 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, which allows the gas to flow rapidly through the first gas channel 510 and discharge to the outside of the battery cell 1 through the explosion-proof hole 131. Furthermore, the second gas channel 520 occupies a small space within the lumen 110 in the direction from the first side wall 120 to the second side wall 130. Therefore, while ensuring a high-speed gas flow, the space occupied by the first bottom support 500 and the second bottom support 600 is reduced, and thus further avoids capacity loss of the electrode core 400 and ensures the energy density of the battery cell 1.
[0059] In some specific embodiments of this disclosure, as shown in Figure 2, the dimension of the electrode core 400 in the longitudinal direction of the second side wall 130 is L1, and the length of the first bottom support 500 and the second bottom support 600, respectively, is L2, such that 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 to be 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 coming into direct contact with the explosion-proof hole 131, ensuring normal flow through the explosion-proof hole 131, and improving the explosion-proof effect. On the other hand, the dimensions of the second side walls 130 of the first bottom support 500 and the second bottom support 600 in the longitudinal direction are avoided, the dimensions of the second side walls 130 of the first gas channel 510 in the longitudinal direction 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, gas can be freely exhausted, the amount of material required to manufacture 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 therefore costs are 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 the first bottom support 500 and the second bottom support 600 are 20 mm or more.
[0062] Therefore, the length of the electrode core 400 is not made excessively large, thereby not making the overall length of the battery cell 1 excessively large, and thus 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 made excessively short. Therefore, the length of the first gas channel 510 is kept sufficiently long, thereby widening the space of the first gas channel 510, making it less likely to become blocked, and allowing the gas to be exhausted smoothly.
[0063] In some specific embodiments of this disclosure, as shown in Figure 3, the explosion-proof valve 300 is positioned on the side of the second side wall 130 facing the lumen 110, or on the side of the second side wall 130 opposite to 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 positioned on the side of the second side wall 130 facing the lumen 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 positioned on the side of the second side wall 130 opposite to the lumen 110. In other words, the explosion-proof valve 300 is positioned outside the housing 100. In this case, the assembly space outside the housing 100 is increased, making it easier to assemble the explosion-proof valve 300 into the housing 100.
[0065] In some specific embodiments of this disclosure, the battery cell 1 further includes a protective sheet (not shown). The protective sheet is connected to the housing 100 and is located on the side of the explosion-proof valve 300 opposite to the lumen 110.
[0066] The protective sheet can shield the explosion-proof valve 300. Whether the explosion-proof valve 300 is mounted on the side of the second side wall 130 facing the lumen 110, or positioned on the side of the second side wall 130 opposite to the lumen 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 the transport of the battery cell 1, preventing damage to the explosion-proof valve 300 due to impacts during transport and extending the lifespan of the battery cell 1.
[0067] In some specific embodiments of the present disclosure, as shown in Figures 6 and 7, the first bottom support 500 includes a first side plate 550 and a first bottom plate 560 connected to each other, and the second bottom support 600 includes a second side plate 610 and a second bottom plate 620 connected to each other.
[0068] The first base plate 560 is connected to the second side wall 130 and extends along the length of the second side wall 130. One end of the first side plate 550 is connected to the first base 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 base plate 620 is connected to the second side wall 130 and extends along the length of the second side wall 130. One end of the second side plate 610 is connected to the second base 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 bottom plate 560 and the second bottom plate 620 are separated, and the first bottom plate 560 and the second bottom plate 620 define the 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 side wall of the lumen 110 is increased, the connection structure becomes more stable and reliable, and changes in the relative position of the first bottom support 500 and the second bottom support 600 with respect to the housing 100 are prevented. 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, increasing the structural strength of the housing 100.
[0070] It should be understood that the other end of the first side plate 550 may be connected directly or indirectly to the first side wall 120. That is, the other end of the first side plate 550 can be connected directly to one end of the first side wall 120, or the first side plate 550 can be connected to one end of the first side wall 120 through the insulating spacer ring 800. Similarly, the other end of the second side plate 610 may be connected directly or indirectly to the first side wall 120. That is, the other end of the second side plate 610 can be connected directly to the other end of the first side wall 120, or the second side plate 610 can be connected to the other end of the first side wall 120 through the insulating spacer ring 800.
[0071] In some specific embodiments of this disclosure, as shown in Figures 4 to 6, a first reinforcing rib 551 is provided on the side surface of a first side plate 550 facing the electrode core 400, and the first reinforcing rib 551 extends along the longitudinal direction of the first side plate 550. A second reinforcing rib 611 is provided on the side surface of a second side plate 610 facing the electrode core 400, and the second reinforcing rib 611 extends along the longitudinal direction of the second side plate 610.
[0072] By placing 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 made more secure. By placing 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 made more secure. Therefore, the first bottom support 500 and the second bottom support 600 can increase the structural strength of the housing 100.
[0073] In some specific embodiments of this disclosure, as shown in Figures 2 and 4, the first side plate 550 is parallel to the second side plate 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 longitudinal ends of the second side wall 130 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 longitudinal ends of the second side wall 130. This allows the first side plate 550 and the second side plate 610 to be attached to the side walls of the lumen 110. This reduces the space occupied by the first side plate 550 and the second side plate 610 in the lumen 110, and the first side plate 550 and the second side plate 610 reduce the loss of capacitance of the electrode core 400, thereby ensuring the energy density of the battery cell 1.
[0075] In some specific embodiments of the present disclosure, the sides of the insulating spacer ring 800 facing the lumen 110 may be defined by a first limiting projection 121 and a second limiting projection 122. The first side plate 550 abuts against the side of the first limiting projection 121 opposite to the second limiting projection 122, and the second side plate 610 abuts against the side of the second limiting projection 122 opposite to the first limiting projection 121.
[0076] For example, one end of the first side plate 550 opposite to the second side wall 130 may be connected to the first limiting projection 121 by a hot melt connection, snap-fit connection, or pinhole connection, but is not limited to this. One end of the second side plate 610 opposite to the second side wall 130 may be connected to the second limiting projection 122 by a hot melt connection, snap-fit connection, or pinhole connection, but is not limited to this.
[0077] In this way, the first limiting projection 121 and the second limiting projection 122 can restrict the first bottom support 500 and the second bottom support 600 in the longitudinal direction of the first side wall 120 so as to avoid changes in the relative positions of the first side wall 120, the first bottom support 500 and the second bottom support 600, and so as to be able to stably support the electrode core 400.
[0078] In some specific embodiments of the present disclosure, as shown in Figure 1, the explosion-proof hole 131 is located at the center of the electrode core 400 in the thickness direction, 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 positioning the explosion-proof hole 131 at the center of the electrode core 400, the explosion-proof valve 300 can effectively detect the gas pressure inside the battery cell 1. When the gas pressure inside the battery cell 1 is excessively high, the explosion-proof valve 300 can be immediately opened to exhaust the gas inside the battery cell 1, thereby further improving the explosion-proof effect of the battery cell 1.
[0080] In addition, this arrangement makes the structure of the housing 100 symmetrical in the longitudinal direction of the second side wall 130, and the housing 100 has the same structural strength at both ends in the longitudinal direction of the second side wall 130. This is beneficial for maintaining consistency in the structural strength of the housing 100.
[0081] In some specific embodiments of this disclosure, the battery cell 1 further comprises an insulating film 700, which is positioned on the 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 placed within the lumen 110, between the explosion-proof valve 300 and the electrode core 400. By placing the insulating film 700, the explosion-proof valve 300 can be isolated from the electrolyte, preventing corrosion of the explosion-proof valve 300 due to prolonged immersion in the electrolyte, preventing battery leakage, avoiding increases or decreases in the blow-off pressure of the explosion-proof valve 300 due to the influence of the electrolyte, and ensuring that the explosion-proof valve 300 operates in a stable and reliable state.
[0083] In some specific embodiments of this disclosure, as shown in Figures 4 and 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, and 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 the value obtained by subtracting the voltage of the housing 100 from the voltage of the positive terminal post 210.
[0084] Furthermore, the housing 100 and explosion-proof valve 300 can be made of metallic aluminum or an 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 metallic 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 explosion-proof valve 300 from being corroded by the lithium-ion electrolyte, protecting the housing 100 and the explosion-proof valve 300 attached to the housing 100, and thus further preventing corrosion of the housing 100 and explosion-proof valve 300, thereby extending the lifespan of the battery cell 1.
[0085] Furthermore, 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 terminal of the battery without a resistor, and the housing 100 is connected to the positive terminal 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 and prevent a short circuit, allowing the battery cell 1 to have high safety performance during use.
[0086] In some specific embodiments of this disclosure, as shown in Figures 4 and 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 also 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 the 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 metallic compounds. When the voltage difference between the negative electrode terminal post 220 and the housing 100 is small, the voltage of the housing 100 approaches the voltage of the negative electrode 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, protecting the housing 100 and the explosion-proof valve 300 attached to the housing 100, and thus further preventing corrosion of the housing 100 and the explosion-proof valve 300, thereby extending the lifespan of the battery cell 1.
[0088] Furthermore, 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 terminal of the battery without a resistor, and the housing 100 is connected to the negative terminal 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 and prevent a short circuit, allowing the battery cell 1 to have high safety performance during use.
[0089] In some specific embodiments of this 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] A second side wall 130 and a lumen 110 are formed in the housing body 140, and the housing body 140 is provided with an opening facing the second side wall 130, which communicates with the lumen 110. A housing cover 150 is attached to the housing body 140 and covers the lumen 110, a first side wall 120 is formed in the housing cover 150, and terminal posts 200 are connected to the housing cover 150. By configuring the housing 100 to include separate components, the difficulty of manufacturing the housing 100 is reduced, the manufacturing process of the housing body 140 and housing cover 150 is simplified, manufacturing becomes easier, and it is also easier to place the electrode core 400 and electrolyte into the lumen 110.
[0091] As shown in Figure 8, a battery pack 2 according to one 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 installed inside the box 3 with the explosion-proof valve 300 facing the bottom wall of the box 3. Therefore, in the event of thermal runaway of the battery cell, high-temperature gas or flame will be ejected through the explosion-proof 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 being highly safe, having a smooth gas flow, and having a good explosion-proof effect by using the battery cell 1 according to the embodiment of the present disclosure.
[0093] As shown in Figures 9 and 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 mounted by a box 3 to the vehicle body of the vehicle 4 or to the chassis of the vehicle 4. Alternatively, the vehicle 4 includes a battery cell 1 according to an embodiment of the present disclosure, and the battery cell 1 is mounted to the vehicle body of the vehicle 4 or to the chassis of the vehicle 4. That is, the battery cell 1 can be directly mounted to the vehicle body of the vehicle 4 or to the chassis of the vehicle 4. Alternatively, the battery cell 1 can be mounted in a box 3 and incorporated into the battery pack 2, and the battery pack 2 can be mounted by the box 3 to the vehicle body of the vehicle 4 or to the chassis of the vehicle 4.
[0094] The vehicle 4 according to the embodiments of the present disclosure has the advantages of high safety, smooth gas flow, and good explosion-proof effect by using the battery cell 1 and battery pack 2 according to the embodiments of the present disclosure.
[0095] In some specific embodiments of the present disclosure, the battery cell 1 or battery pack 2 is mounted on the vehicle body of the vehicle 4 or on the chassis of the vehicle 4, with the first side wall 120 positioned above the second side wall 130.
[0096] In particular, the first side wall 120 may face the interior of the vehicle 4, and the second side wall 130 may face the exterior of the vehicle 4. That is, the explosion-proof valve 300 may be on the opposite side of the occupant compartment of the vehicle 4. When the battery cell 1 experiences thermal runaway, the hot gas or flame can be ejected through the explosion-proof valve 300 in the opposite direction from the occupant compartment of the vehicle 4, thereby preventing the flame from being ejected directly into the vehicle, reducing the possibility of injury to occupants inside the vehicle, and further protecting the safety of occupants inside the vehicle.
[0097] Other configurations and operations of the battery cell 1, battery pack 2, and vehicle 4 according to embodiments of the present disclosure are known to those skilled in the art and will not be described in detail here.
[0098] In this specification, any description referring to terms such as “one embodiment,” “several embodiments,” “exemplary embodiment,” “example,” “specific example,” or “several examples” means that any specific features, structures, materials, or properties described in relation to an embodiment or example are included in at least one embodiment or example of this disclosure. In this specification, the exemplary descriptions of the aforementioned terms do not necessarily refer to the same embodiment or example. Furthermore, any specific features, structures, materials, or properties described may be combined in any suitable manner in one or more embodiments.
[0099] While embodiments of this disclosure are illustrated and described, those skilled in the art should understand that various modifications, alterations, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of this disclosure, and that the scope of this disclosure is defined by the appended claims and their equivalents.
Claims
1. Battery cell (1), A housing (100), wherein the housing (100) comprises a lumen (110), a first side wall (120) and a second side wall (130) facing each other, the second side wall (130) having an explosion-proof hole (131), and the housing (100) having the first side wall (120) and the second side wall (130), A first bottom support (500) and a second bottom support (600), wherein the first bottom support (500) and the second bottom support (600) are arranged within the lumen (110), the second side wall (130) supports the first bottom support (500) and the second bottom support (600), the first bottom support (500) is separated from the second bottom support (600), the first bottom support (500) and the second bottom support (600) define a first gas channel (510), and the explosion-proof hole (131) communicates with the lumen (110) through the first gas channel (510), A terminal post (200), wherein the terminal post (200) is positioned on a side wall of the housing (100) other than the second side wall (130), An explosion-proof valve (300) is provided, wherein 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), An electrode core (400) is provided, wherein the electrode core (400) is positioned within the lumen (110) and connected to the terminal post (200), and the first bottom support (500) and the second bottom support (600) both support the electrode core (400), and the electrode core (400) is separated from the explosion-proof hole (131), and the electrode core (400) is provided, A battery cell (1) equipped with the following features.
2. The battery cell (1) according to claim 1, wherein at least one side surface of the first bottom support (500) and the second bottom support (600) facing the second side wall (130) is composed of a second gas channel (520), the second gas channel (520) 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 lumen (110) through the plurality of exhaust holes (530).
3. The battery cell (1) according to claim 2, wherein at least one of the sides of the first bottom support (500) and the second bottom support (600) facing the second side wall (130) is composed of 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) according to claim 3, wherein each support rib (540) has a height in the range of 0.5 mm to 3 mm.
5. The battery cell (1) according to any one of claims 2 to 4, wherein the first gas channel (510) extends along a direction perpendicular to the second side wall (130), and the second gas channel (520) extends along the longitudinal direction of the second side wall (130).
6. The dimension of the electrode core (400) in the longitudinal direction of the second side wall (130) is L １ The lengths of the first bottom support (500) and the second bottom support (600) are L ２ And L １ and L ２ However, 0.04 ≤ L ２ / L １ A battery cell (1) according to claim 1, satisfying ≤0.
45.
7. L １ and L ２ where L １ ≤ 500 mm, and L ２ ≥ 20 mm, the battery cell (1) according to claim 6.
8. The first bottom support (500) comprises a first side plate (550) and a first bottom plate (560) connected to each other, the first bottom plate (560) being connected to the second side wall (130), the first bottom plate (560) extending along the length of the second side wall (130), one end of the first side plate (550) being connected to the first bottom plate (560), and the other end of the first side plate (550) being connected to one end of the first side wall (120), The second bottom support (600) comprises a second side plate (610) and a second bottom plate (620) connected to each other, the second bottom plate (620) being connected to the second side wall (130), the second bottom plate (620) extending along the length of the second side wall (130), one end of the second side plate (610) being connected to the second bottom plate (620), and the other end of the second side plate (610) being connected to the other end of the first side wall (120), The battery cell (1) according to claim 1, wherein the first bottom plate (560) is separated from the second bottom plate (620), and the first bottom plate (560) and the second bottom plate (620) define the first gas channel (510).
9. A first reinforcing rib (551) is provided on the side surface of the first side plate (550) facing the electrode core (400), and the first reinforcing rib (551) extends along the longitudinal direction of the first side plate (550). The battery cell (1) according to claim 8, wherein a second reinforcing rib (611) is arranged on the side surface of the second side plate (610) facing the electrode core (400), and the second reinforcing rib (611) extends along the longitudinal direction of the second side plate (610).
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). The battery cell (1) according to claim 8, wherein a first limiting projection (121) and a second limiting projection (122) are arranged on the side surface of the insulating spacer ring (800) facing the lumen (110), the first side plate (550) abuts against the side surface of the first limiting projection (121) opposite to the second limiting projection (122), and the second side plate (610) abuts against the side surface of the second limiting projection (122) opposite to the first limiting projection (121).
12. The explosion-proof hole (131) is located at the center of the electrode core (400) in the thickness direction, and / or The battery cell (1) according to claim 1, 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. The invention further comprises an insulating film (700), wherein the insulating film (700) is positioned on the side surface of the explosion-proof valve (300) facing the inner cavity (110). The battery cell (1) according to claim 1.
14. The battery cell (1) according to claim 1, wherein the terminal post (200) is arranged on the first side wall (120).
15. The battery cell (1) according to claim 1, wherein the terminal post (200) comprises a positive terminal post (210) and a negative terminal post (220), the housing (100) 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 or more and 2.5V or less.
16. The battery cell (1) according to claim 1, 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 the difference between the voltage of the housing (100) and the voltage of the negative terminal post (220) is 0V or more and 2.5V or less.
17. The housing (100) A housing body (140) wherein the second side wall (130) and the internal 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 internal cavity (110), A housing cover (150) is attached to the housing body (140), covers the internal cavity (110), has a first side wall (120) formed in the housing cover (150), and has terminal posts (200) connected to the housing cover (150). A battery cell (1) according to claim 1, comprising:
18. Battery pack (2), Box (3) and A battery cell according to claim 1, wherein the battery cell (1) is installed inside the box (3) with the explosion-proof valve (300) facing the bottom wall of the box (3), A battery pack (2) is provided.
19. A vehicle (4) comprising a battery cell (1) according to claim 1, or a battery pack (2) according to claim 18, wherein the first side wall (120) is located above the second side wall (130).