Battery cells, battery packs, and vehicles

Abstract

A battery cell (1), a battery pack (2), and a vehicle (4). The battery cell (1) has a first recess (140) and a plurality of second recesses (150) that are constructed on an inner wall surface of a second side wall (130) and are concave in a direction away from the inner cavity (110), the first recess (140) forming an internal main air passage (141) in the inner cavity (110), the plurality of second recesses (150) forming a plurality of branch air passages (151) in the inner cavity (110), and the plurality of branch air passages (151) are The device comprises a first recess (140) and a plurality of second recesses (150) which are separately connected to the main air passage (141) and in which an explosion-proof hole (160) corresponding to the position of the main air passage (141) is provided in the second side wall (130), an explosion-proof valve (300) mounted on the second side wall (130), and an electrode core body (400) which is provided within the housing (100) and spaced apart from the explosion-proof hole (160).

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese Patent Application No. “202221130529.1” filed on May 12, 2022 by BYD Company Limited, entitled “BATTERY CELL, BATTERY PACK, AND VEHICLE.”

[0002] The present disclosure relates to the technical field of vehicles, and more particularly to battery cells, battery packs, and vehicles. [Background technology]

[0003] In the related art, the terminal post of the battery cell and the explosion-proof valve are generally located at the same end. When the battery cell experiences thermal runaway, the released high-temperature gas or flame can easily burn the terminal post of the battery cell and the devices connected to it, causing high-voltage arc discharge or secondary damage.

[0004] Alternatively, the battery cell is disposed with a boss, the boss protrudes toward the inside of the battery cell, and an explosion-proof valve is disposed on the boss, and the explosion-proof valve is spaced apart from the terminal post. However, the communication between the inner cavity of the battery cell and the explosion-proof hole is insufficient, and the electrode core of the battery cell directly abuts against the boss, so that the explosion-proof hole is blocked by the electrode core, and the gas inside the battery cell cannot flow normally to the outside, resulting in insufficient explosion-proof effect. Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure aims to solve at least one of the technical problems of the related art. To achieve this, the objective of the present 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] Another object of the present disclosure is to provide a battery pack having a battery cell.

[0007] Another object of the present disclosure is to provide a vehicle having a battery cell or battery pack. [Means for solving the problem]

[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 side wall and a second side wall opposed to each other, an inner wall surface of the second side wall being configured with a first recess and a plurality of second recesses, the first recess and the second recess being recessed in a direction away from the inner cavity, the first recess forming a main gas passage in the inner cavity, the plurality of second recesses forming a plurality of branch gas passages in the inner cavity, each of the plurality of branch gas passages communicating with the main gas passage, and an explosion-proof hole in the second side wall positionally corresponding to the main gas passage; a terminal post, the terminal post being disposed in a wall of the housing other than the second side wall; an explosion-proof valve, the explosion-proof valve being mounted on 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 in the housing, the electrode core being 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, the main gas passage and the multiple branch gas passages are arranged at least in the length direction of the second side wall, and a dimension of the main gas passage in the width direction of the second side wall is greater than each of the dimensions of the branch gas passages in the width direction of the second side wall.

[0011] According to some exemplary embodiments of the present disclosure, the main gas passage extends along the width of the second side wall, each of the branch gas passages extends along the length of the second side wall, and the multiple branch gas passages are distributed on two sides of the main gas passage in the length of the second side wall.

[0012] According to some exemplary embodiments of the present disclosure, a plurality of branch gas passages are disposed on each side of the main gas passage in the length direction of the second side wall, the plurality of branch gas passages are spaced apart along the width direction of the second side wall, an equal number of branch gas passages are disposed on two sides of the main gas passage in the length direction of the second side wall, and the branch gas passages on the two sides of the main gas passage in the length direction of the second side wall are disposed in one-to-one correspondence.

[0013] According to some exemplary embodiments of the present disclosure, an outer wall surface of the second sidewall is configured with a first protrusion, the first protrusion protruding in a direction away from the inner cavity, the first protrusion corresponding in position to the first recess, and an explosion-proof hole passing through the first protrusion and the first recess.

[0014] According to some exemplary embodiments of the present disclosure, an outer wall surface of the second sidewall is configured with a plurality of second protrusions, each of which protrudes in a direction away from the internal cavity, and the plurality of second protrusions positionally correspond to the plurality of second recesses in a one-to-one correspondence.

[0015] According to some exemplary embodiments of the present disclosure, the first protrusion and the first recess are centrally located on the second side wall in a length direction of the second side wall.

[0016] According to some exemplary embodiments of the present disclosure, the depth of the main gas passage is in the range of 0.5 mm to 3 mm, and the depth of each of the branch gas passages is in the range of 0.5 mm to 3 mm.

[0017] According to some exemplary embodiments of the present disclosure, a plurality of electrode cores are provided, the plurality of electrode cores being arranged in order, the arrangement direction of the plurality of electrode cores being aligned with the thickness direction of the electrode cores, and each of the electrode cores corresponding to at least one of the branch gas passages.

[0018] 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 maximum length of the first recess and the multiple second recesses on the second side wall is L2, where L1 and L2 satisfy 0.04≦L2 / L1≦0.96.

[0019] According to some exemplary embodiments of the present disclosure, L1 and L2 further satisfy L1≦500 mm, and L2≧20 mm.

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

[0021] According to some exemplary embodiments of the present disclosure, the battery cell further includes an isolator film disposed in the lumen, the isolator film being positioned between at least a portion of the lumen and the explosion-proof valve.

[0022] 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 coupled 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.

[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 a steel housing, the negative terminal post is electrically coupled 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.

[0024] According to certain exemplary embodiments of the present disclosure, the housing includes a housing body, the housing body having a second side wall and an inner cavity formed therein, the housing body having an opening facing the second side wall, the opening communicating with the inner cavity, and a housing cover mounted to the housing body, the housing cover covering the inner cavity, the first side wall formed in the housing cover, and the terminal post coupled to the housing cover.

[0025] 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, the battery cell being mounted within the box with an anti-explosion valve facing a bottom wall of the box.

[0026] 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 anti-explosion effect by utilizing the battery cells.

[0027] 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 a first side wall is positioned above a second side wall.

[0028] 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 anti-explosion effect by utilizing the battery cells and battery packs.

[0029] 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.

[0030] The above and / or other additional aspects and advantages of the present disclosure will become apparent and understandable from the following detailed description of the embodiments taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0031] [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 schematic structural diagram of a battery cell according to an embodiment of the present disclosure, viewed from another perspective. [Diagram 3] FIG. 2 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure, viewed from another perspective. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Diagram 5] FIG. 5 is a partial enlarged view of the enclosed area B in FIG. 4. [Figure 6] FIG. 4 is a cross-sectional view taken along line CC in FIG. [Figure 7] FIG. 7 is a partial enlarged view of the enclosed area B in FIG. 6. [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] FIG. 2 is a schematic diagram of a vehicle according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] DETAILED DESCRIPTION OF THE DRAWINGS The embodiments of the present disclosure are described in detail below, examples of which are illustrated in the drawings, and identical or similar elements, or elements having identical or similar functions, are represented by identical or similar reference numerals throughout the description. The embodiments described below with reference to the accompanying drawings are exemplary and are merely intended to illustrate the present disclosure, and cannot be construed as limiting the present disclosure.

[0033] In describing the present disclosure, terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicate orientations or positions based on the orientations or positions illustrated in the drawings, and are provided merely to facilitate or simplify the description of the present disclosure, but it should be understood that they do not necessarily mean or imply that the devices or components shown are provided or constructed or operated in the specified orientation. Thus, such terms should not be construed as limitations of the present disclosure.

[0034] It should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying the relative importance or quantity of the technical features being depicted. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, in the description of this disclosure, unless otherwise indicated, "plurality" means two or more.

[0035] A battery cell 1 according to one embodiment of the present disclosure will now be described with reference to the accompanying drawings.

[0036] As shown in FIGS. 1 to 7, a battery cell 1 according to an embodiment of the present disclosure includes a housing 100, a terminal post 200, an explosion-proof valve 300, and an electrode core body 400.

[0037] The housing 100 has a cavity 110, and a first side wall 120 and a second side wall 130 are opposite to each other. The inner wall surface of the second side wall 130 is configured with one first recess 140 and a plurality of second recesses 150. The first recess 140 and the second recess 150 are recessed in a direction away from the cavity 110. The first recess 140 forms a main gas passage 141 in the cavity 110, and the plurality of second recesses 150 form a plurality of branch gas passages 151 in the cavity 110, and the plurality of branch gas passages 151 are each connected to the main gas passage 141. The second side wall 130 is provided with an explosion-proof hole 160 that is positionally corresponding to the main gas passage 141. The terminal post 200 is disposed on a wall of the housing 100 other than the second side wall 130, and the explosion-proof valve 300 is mounted on the second side wall 130 and configured to cover the explosion-proof hole 160. The electrode core body 400 is disposed in the housing 100 and is spaced apart from the explosion-proof hole 160.

[0038] 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 the gas is rapidly discharged, so as to rapidly reduce the pressure in the cavity and prevent the explosion of the battery cell 1. At this time, the explosion-proof valve 300 serves for explosion protection.

[0039] In order to separate the explosion-proof valve 300 from the electrolyte in the cavity 110, in some embodiments of the present disclosure, an isolation film 500 is further arranged. The isolation film 500 is arranged in the cavity 110, and the isolation film 500 is located between at least a portion of the cavity 110 and the explosion-proof valve 300. The isolation film 500 can separate the explosion-proof valve 300 from the electrolyte, prevent the corrosion of the explosion-proof valve 300 caused by long-term immersion in the electrolyte, prevent the battery from leaking, avoid the increase or decrease of the opening pressure of the explosion-proof valve 300 caused by the influence of the electrolyte, and allow the explosion-proof valve 300 to be in a stable and reliable working state.

[0040] For example, the isolator film 500 may be made from polypropylene (PP), polyethylene (PE), or other polyester compounds.

[0041] In some embodiments of the present disclosure, the isolation film 500 is separated from the walls of the main gas passage 141 and the branch gas passage 151, and the isolation film 500 is gas impermeable. When the gas pressure in other parts of the lumen 110 other than the main gas passage 141 and the branch gas passage 151 is small, the main gas passage 141 and the branch gas passage 151 do not communicate with other parts of the lumen 110 other than the main gas passage 141 and the branch gas passage 151. When the gas pressure in the lumen 110 increases, the isolation film 500 is pressurized and deformed, and the gas in other parts of the lumen 110 other than the main gas passage 141 and the branch gas passage 151 can penetrate the isolation film 500 and enter the main gas passage 141 and the branch gas passage 151.

[0042] In some embodiments of the present disclosure, the isolation film 500 is separated from the walls of the main gas passage 141 and the branch gas passage 151, and the isolation film 500 is gas permeable. In this case, the main gas passage 141 and the branch gas passage 151 communicate with other parts of the lumen 110 other than the main gas passage 141 and the branch gas passage 151, and gas in other parts of the lumen 110 other than the main gas passage 141 and the branch gas passage 151 can enter the main gas passage 141 and the branch gas passage 151 through the isolation film 500.

[0043] In some embodiments of the present disclosure, the isolation film 500 may be disposed to directly adhere to the walls of the main gas passage 141 and the branch gas passage 151. In this case, the main gas passage 141 and the branch gas passage 151 communicate with other parts of the lumen 110 other than the main gas passage 141 and the branch gas passage 151, and gas in other parts of the lumen 110 other than the main gas passage 141 and the branch gas passage 151 can directly enter the main gas passage 141 and the branch gas passage 151.

[0044] In the battery cell 1 according to the embodiment of the present disclosure, the housing 100 is configured with an inner cavity 110 and a first side wall 120 and a second side wall 130 on opposite sides, the terminal post 200 is disposed in a wall of the housing 100 other than the second side wall 130, the second side wall 130 is provided with an explosion-proof hole 160 communicating with the main gas passage 141, the explosion-proof valve 300 is mounted on the second side wall 130 and configured to cover the explosion-proof hole (160), and the electrode core 400 is disposed inside the housing 100 and is spaced apart from the explosion-proof hole 160. The terminal post 200 and the explosion-proof hole 160 are disposed in different side walls of the housing 100, so that the terminal post 200 is spaced apart from the explosion-proof hole 160. In the event of thermal runaway of the battery cell 1, the high-temperature gas or flame emitted from the explosion-proof hole 160 will not burn the terminal post 200, avoiding secondary damage and providing high safety performance. Furthermore, the electrode core 400 is disposed within the housing 100 and is separated from the explosion-proof hole 160. In this way, the electrode core 400 does not obstruct the explosion-proof hole 160, and the gas within the lumen 110 communicates with the outside through the explosion-proof hole 160.

[0045] In addition, the inner wall surface of the second side wall 130 is configured with a first recess 140 and a plurality of second recesses 150 recessed in a direction away from the inner cavity 110. It should be understood that the inner cavity 110 can accommodate the electrode core 400. The first recess 140 and the second recess 150 are formed by recessing a portion of the second side wall of the housing in the related art in a direction away from the first side wall, and the first recess 140 and the plurality of second recesses 150 do not reduce the space of the inner cavity 110. That is, the volume of the inner cavity 110 of the battery cell 1 in the embodiment of the present disclosure is the same as the volume of the inner cavity of the battery cell in the related art. The space in the inner cavity 110 is sufficiently large, and the volume of the electrode core 400 can be large, and thus the energy density of the battery cell 1 can be guaranteed.

[0046] Furthermore, the first recess 140 forms a main gas passage 141 that communicates with the inner cavity 110, and the multiple second recesses 150 form a multiple branch gas passages 151 that communicate with the inner cavity 110, and the multiple branch gas passages 151 each communicate with the main gas passage 141.

[0047] The explosion-proof valve 300 is disposed on the second side wall 130 opposite the terminal post 200. The space between the electrode core 400 and the second side wall 130 is small, so the gas generated by the electrode core 400 cannot be stored. If the recess is not disposed, the gas generated by the electrode core 400 will move to the space between the electrode core 400 and the first side wall 120. 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 160, which creates a great danger.

[0048] In the battery cell 1 of the present disclosure, a main gas passage 141 and a plurality of branch gas passages 151 for storing the gas generated by the electrode core 400 are formed by arranging the first recess 140 and the plurality of second recesses 150. 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. A part of the gas generated by the electrode core 400 is stored in the main gas passage 141 and can flow directly from the main gas passage 141 to the explosion-proof hole 160. The other part of the gas generated by the electrode core 400 is stored in the branch gas passage 151 and can flow from the branch gas passage 151 to the main gas passage 141 and the explosion-proof hole 160. The structural strength of the second side wall 130 is guaranteed to prevent the deformation of the second side wall 130 caused by the excessively large pressure in the inner cavity 110, avoid the influence on the opening pressure of the explosion-proof valve 160, and promote the normal use of the battery cell 1. On the other hand, the main gas passage 141 and the multiple branch gas passages 151 can cover a larger area of ​​the second side wall 130, and the gas flows through the main gas passage 141 and the multiple branch gas passages 151 at the same time, so that the gas is discharged more smoothly. That is, the gas generated by the electrode core 400 can flow through the main gas passage 141 and the multiple branch gas passages 151 to the explosion-proof hole 160 more quickly. The gas in the main gas passage 141 and the multiple branch gas passages 151 can be discharged to the outside of the battery cell 1 through the explosion-proof hole 160 more quickly, so that the gas flows more smoothly and the explosion-proof effect is better.

[0049] 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.

[0050] 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 160 is disposed on the second side wall 130. That is, the terminal post 200 and the explosion-proof hole 160 are disposed on two opposite sides of the housing 100. In this way, the terminal post 200 and the explosion-proof hole 160 are sufficiently separated, and the distance between the terminal post 200 and the explosion-proof hole 160 is large. When the battery cell 1 experiences thermal runaway, the high-temperature gas or flame emitted from the explosion-proof hole 160 will not burn the terminal post 200, effectively avoiding secondary damage and providing high safety performance. In addition, the electrode core 400 does not obstruct the explosion-proof hole 160, and the gas in the first gas flow path 510 communicates with the outside through the explosion-proof hole 160.

[0051] 2 and 3, the main gas passage 141 and the multiple branch gas passages 151 are arranged at least in the length direction of the second side wall 130. Thus, the main gas passage 141 and the multiple branch gas passages 151 cover a larger area of ​​the second side wall 130 in the length direction. In the event of thermal runaway, gas generated by the electrode core 400 can flow to the outside of the battery cell 1 more quickly through the main gas passage 141 and the multiple branch gas passages 151.

[0052] Furthermore, the dimension of the main gas passage 141 in the width direction of the second side wall 130 is larger than the dimension of each of the branch gas passages 151 in the width direction of the second side wall 130. By setting the dimension of the main gas passage 141 in the width direction to be large, each side of the main gas passage 141 of the second side wall 130 can be connected to multiple branch gas passages 151, making it easier to communicate between the branch gas passages 151 and the main gas passage 141. Furthermore, the cross-sectional area of ​​the main gas passage 141 may be larger, allowing for smooth flow.

[0053] 2 and 3, the main gas passage 141 extends along the length of the second sidewall 130. Each of the branch gas passages 151 extends along the length of the second sidewall 130, and the multiple branch gas passages 151 are distributed on two sides of the main gas passage 141 in the length of the second sidewall 130.

[0054] Therefore, the main gas passage 141 can cover a larger area in the width direction of the second side wall 130, so as to further improve the exhaust effect of the electrode core 400. In addition, the multiple branch gas passages 151 are arranged on each side of the main gas passage 141 in the length direction of the second side wall 130, so that the multiple branch gas passages 141 and the main gas passage 151 can cover as large an area as possible in the length direction of the second side wall 130. The arrangement is wider and basically has no blind spot, so as to further improve the flow rate of gas in the main gas passage 141 and the branch gas passage 151 when the electrode core 400 experiences thermal runaway. Therefore, the explosion-proof effect of the battery cell 1 is much better.

[0055] 2 and 3, in some specific embodiments of the present disclosure, a plurality of branch gas passages 151 are disposed on each side of the main gas passage 141 in the length direction of the second side wall 130, and the plurality of branch gas passages 151 are spaced apart along the width direction of the second side wall 130. An equal number of branch gas passages 151 are disposed on two sides of the main gas passage 141 in the length direction of the second side wall 130. The branch gas passages 151 on the two sides of the main gas passage 141 in the length direction of the second side wall 130 are disposed in one-to-one correspondence.

[0056] In other words, the multiple branch gas passages 151 are arranged symmetrically with respect to the main gas passage 141 and extend along the length direction of the second side wall 130. The multiple branch gas passages 151 located on each side of the main gas passage 141 cover the same area of ​​the electrode core 400, and the gas flow on the two sides of the main gas passage 141 has good consistency, so as to avoid the problem that the gas flow is fast on one side of the main gas passage 141 and obstructed on the other side of the main gas passage 141.

[0057] For example, in the length direction of the second side wall 130, two branch gas passages 151 may be arranged on each side of the main gas passage 141. This increases the total volume of the branch gas passages 151, so that the gas flows faster, improves the installation of excessively large branch gas passages 151, and makes the structural strength of the second side wall 130 higher, so that the second side wall 130 can more reliably support the electrode core 400. Obviously, in the length direction of the second side wall 130, the number of branch gas passages 151 on each side of the main gas passage 141 may be increased according to the number of the electrode cores 400, and the gas generated by the electrode core 400 may be quickly collected at the position of the main gas passage 141 and the explosion-proof hole 160.

[0058] 2 and 3, the outer wall surface of the second sidewall 130 is configured with a first protrusion 131. The first protrusion 131 protrudes in a direction away from the lumen 110, and the first protrusion 131 corresponds in position to the first recess 140.

[0059] That is, the first protrusion 131 protrudes in a direction away from the cavity 110 in correspondence with a portion of the first recess 140 that is recessed in a direction away from the cavity 110. In this manner, the thickness of the second side wall 130 at the first recess 140 and the first protrusion 131 may be increased, which improves the structural strength of the second side wall 130 and makes the overall structural strength of the housing 100 higher.

[0060] Furthermore, the explosion-proof hole 160 may penetrate the first recess 140 and the first protrusion 131 in a direction perpendicular to the second side wall 130 to communicate the inner cavity 110 of the battery cell 1 with the outside. The extension length of the explosion-proof hole 160 may be the same as the thickness of the second side wall 130. That is, the length of the explosion-proof hole 160 may be shorter so that the structure is very simple and the gas is guided to flow more quickly.

[0061] 2 to 7, in some specific embodiments of the present disclosure, the outer wall surface of the second side wall 130 is configured with a plurality of second protrusions 132. Each of the second protrusions 132 protrudes in a direction away from the inner cavity 110, and the plurality of second protrusions 132 positionally correspond to the plurality of second recesses 150 in a one-to-one correspondence.

[0062] That is, the second protrusion 132 protrudes in a direction away from the cavity 110 in correspondence with a portion of the second recess 150 that is recessed in a direction away from the cavity 110. As a result, the thickness of the second side wall 130 at the second recess 150 and the second protrusion 132 may be increased, which improves the structural strength of the second side wall 130 and makes the overall structural strength of the housing 100 higher.

[0063] 4 to 7, the thickness of the second sidewall 130 at the first protrusion 131 and the first recess 140 is the same as the thickness of the second sidewall 130 at other positions. The thickness of the second sidewall 130 at each of the second protrusions 132 and the corresponding second recess 150 is the same as the thickness of the second sidewall 130 at other positions.

[0064] Therefore, this ensures the consistency of the thickness of the second side wall 130, makes the thickness of the second side wall 130 more uniform, avoids the occurrence of uneven local thickness of the second side wall 130, and further improves the structural strength of the second side wall 130, so that the second side wall 130 can more reliably support the electrode core body 400, and the overall structural strength of the housing 100 is much higher.

[0065] In some specific embodiments of the present disclosure, as shown in Figures 2 to 7, the first protrusion 131 and the first recess 140 are positioned at the center of the second side wall 130 in the longitudinal direction of the second side wall 130.

[0066] It can be understood that the electrode core 400 of the battery cell 1 generates gas. By arranging the first protrusion 131 and the first recess 140 at the center of the second side wall 130 in the length direction, the main gas passage 141 can be located at the center of the electrode core 400 in the length direction. The gas generated by the electrode core 400 can enter the main gas passage 141 more easily. Furthermore, the distances from the main gas passage 141 to the two ends of the second side wall 130 in the length direction are the same, and the distances from the gas generated by the two ends of the electrode core 400 in the length direction of the second side wall 130 to the main gas passage 141 are the same. There is no situation in which the gas on one side has difficulty entering the main gas passage 141, and the exhaust of the gas in the battery cell 1 becomes smoother.

[0067] In addition, such an arrangement makes the structure of the housing 100 symmetrical in the length direction of the second side wall 130, and the housing 100 has the same structural strength at the two ends of the second side wall 130 in the length direction. This is beneficial for maintaining the consistency of the structural strength of the housing 100, and greatly simplifies the structure of the housing 100, and therefore greatly facilitates processing.

[0068] In some specific embodiments of the present 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 facing away from the lumen 110 of the explosion-proof valve 300.

[0069] The protective sheet can shield the explosion-proof valve 300. Whether the explosion-proof valve 300 is mounted on the side facing the inner cavity 110 of the explosion-proof hole 160 or the side facing away from the inner cavity 110 of the explosion-proof hole 160, the protective sheet can prevent other parts of the vehicle from directly contacting the explosion-proof valve 300. In addition, the protective sheet can also protect the explosion-proof valve 300 during transportation of the battery cell 1 to avoid damage to the explosion-proof valve 300 caused by bumps during transportation and extend the service life of the battery cell 1.

[0070] In some specific embodiments of the present disclosure, the depth h1 of the main gas passage 141 is in the range of 0.5 mm to 3 mm, and the depth h2 of each of the branch gas passages 151 is in the range of 0.5 mm to 3 mm. For example, the depth h1 of the main gas passage 141 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm, and the depth h2 of each of the branch gas passages 151 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm.

[0071] Therefore, the depth h1 of the main gas passage 141 and the depth h2 of the branch gas passage 151 are large, so that the space in the main gas passage 141 and the space in the branch gas passage 151 are large, which can accommodate more gas and allow the gas generated by the electrode core 400 to be quickly exhausted for explosion protection. Accordingly, the gas flows more smoothly and the explosion prevention effect is better. Furthermore, the depth h1 of the main gas passage 141 and the depth h2 of the branch gas passage 151 can be avoided from being excessively large, so that the space occupied by the main gas passage 141 and the branch gas passage 151 in the battery cell 1 is not excessively large, which avoids a significant loss of the capacity of the electrode core 400 and allows the battery cell 1 to have a small volume while ensuring that the battery cell 1 has a high energy density.

[0072] In some specific embodiments of the present disclosure, as shown in Fig. 3, a plurality of electrode core bodies 400 are provided and arranged in order. The arrangement direction of the electrode core bodies 400 coincides with the thickness direction of the electrode core bodies 400, and each of the electrode core bodies 400 corresponds to at least one branch gas passage 151. Two, four, or another even number of electrode core bodies 400 may be provided.

[0073] For example, each electrode core 400 may correspond to a corresponding branch gas passage 151 on two sides of the main gas passage 141, and each electrode core 400 may be ensured to have a branch gas passage 151 to guide the gas generated by the parts on the two sides of the main gas passage 141, so that the exhaust rate of the battery cell 1 is further improved, the explosion-proof effect is better, and the battery cell 1 has high safety performance.

[0074] 3, the dimension of the electrode core 400 in the length direction of the second side wall 130 is L1, and the maximum length of the first recess 140 and the plurality of second recesses 150 on the second side wall 130 is L2, where L1 and L2 satisfy 0.04≦L2 / L1≦0.96. For example, L2 / L1 may be 0.04, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 0.96.

[0075] In this way, the dimensions of the first recess 140 or the second recess 150 in the length direction of the second side wall 130 are prevented from becoming excessively small, so that the dimensions of the first recess 140 and the second recess 150 in the length direction of the second side wall 130 are large, the main gas passage 141 and the branch gas passage 151 have a large space, and the gas can be freely exhausted. Furthermore, the dimensions of the first recess 140 and the second recess 150 in the length direction of the electrode core 400 are prevented from becoming excessively large, so that other parts of the second side wall 130 other than the first recess 140 and the second recess 150 can have large dimensions. These parts can stably support the electrode core 400 to avoid contact between the electrode core 400 and the bottom wall of the first recess 140 and the bottom wall of the second recess 150 and ensure normal flow of gas in the main gas passage 141 and the branch gas passage 151.

[0076] Furthermore, as shown in FIG. 3, the dimension L1 of the electrode core 400 in the longitudinal direction of the second side wall 130 is ≦500 mm, and the maximum length L2 of the first recess 140 and the multiple second recesses 150 on the second side wall 130 is ≧20 mm.

[0077] In this way, the length of the electrode core 400 is not excessively large, so that the overall length of the battery cell 1 is not excessively large, thus improving the overall structural strength of the battery cell 1. In addition, the length of the first recess 140 and the length of the plurality of second recesses 150 are not excessively short. Accordingly, the length of the main gas passage 141 and the branch gas passage 151 is ensured to be sufficient, and the main gas passage 141 and the branch gas passage 151 have a very large space, and the gas is exhausted more smoothly.

[0078] In some specific embodiments of the present disclosure, as shown in FIG. 2 and FIG. 3, the main gas passage 141 is located at the center of the electrode core 400 in the length direction of the second side wall 130. In this way, the main gas passage 141 may correspond to the center of the electrode core 400. Therefore, the gas generated by the electrode core 400 can more easily enter the main gas passage 141, making the exhaust of the gas in the battery cell 1 smoother. Furthermore, the second side wall 130 has the same dimensions in its length direction on two sides of the main gas passage 141. That is, the second side wall 130 has consistent structural strength at the two ends in the length direction, and the second side wall 130 can support the electrode core 400 more stably and reliably.

[0079] Furthermore, the explosion-proof hole 160 is positioned at the center of the main gas passage 141 , and the explosion-proof hole 160 is positioned at the center of the electrode core body 400 in the thickness direction of the electrode core body 400 .

[0080] For example, the explosion-proof hole 160 may 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 mainly generated at the center of the electrode core 400. By locating the explosion-proof hole 160 at the center of the electrode core 400, the explosion-proof valve 300 can more effectively sense 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 immediately open to exhaust the gas in the battery cell 1, thereby further improving the explosion-proof effect of the battery cell 1.

[0081] In some specific embodiments of the present disclosure, as shown in FIG. 1, 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 in the range of 0V to 2.5V. The difference between the voltage of the positive terminal post 210 and the voltage of the housing 100 means a value obtained by subtracting the voltage of the housing 100 from the voltage of the positive terminal post 210.

[0082] It should be understood that the housing 100 and the anti-explosion valve 300 may be made of metal aluminum or an aluminum alloy, and the electrolyte in the battery cell 1 is usually a lithium-ion electrolyte. Aluminum reacts with lithium ions at low potential to form a metal compound. 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 is increased. This prevents the housing 100 and the anti-explosion valve 300 from being corroded by the lithium-ion electrolyte, and protects the housing 100 and the anti-explosion valve 300 mounted on the housing 100, thus further preventing the housing 100 and the anti-explosion valve 300 from being corroded, and prolonging the service life of the battery cell 1.

[0083] In addition, 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 circuit of the battery cell 1 and enable the battery cell 1 to have high safety performance during use.

[0084] In some specific embodiments of the present disclosure, as shown in FIG. 1, 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 in the range of 0V to 2.5V. The difference between the voltage of the housing 100 and the voltage of the negative terminal post 220 means a value obtained by subtracting the voltage of the negative terminal post 220 from the voltage of the housing 100.

[0085] 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, that is, the potential of the housing 100 is reduced. 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 mounted on the housing 100, and thus further prevents the housing 100 and the explosion-proof valve 300 from being corroded, and extends the service life of the battery cell 1.

[0086] In addition, a resistor is connected between the negative terminal post 220 and the housing 100. In this way, 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 circuit of the battery cell 1 and enable the battery cell 1 to have high safety performance during use.

[0087] 1 and 2, the housing 100 includes a housing body 170 and a housing cover 180. The housing 100 may be made of an aluminum alloy.

[0088] The second side wall 130 and the inner cavity 110 are formed in the housing body 170, and the housing body 170 is provided with an opening facing the second side wall 130, and the opening communicates with the inner cavity 110. The housing cover 180 is mounted on the housing body 170, and the housing cover 180 covers the inner cavity 110. The first side wall 120 is formed in the housing cover 180, and the terminal post 200 is connected to the housing cover 180. 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 170 and the housing cover 180 are simplified, processing is made more convenient, and it is convenient to put the electrode core 400 and the electrolyte into the inner cavity 110. During assembly, the electrode core 400 is inserted into the cavity 110 through the opening, which is then covered by the housing cover 180 to seal the cavity 110 and protect the electrode core 400 of the battery cell 1 .

[0089] 8, a battery pack 2 according to an embodiment 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 body 3 with the explosion-proof valve 300 facing the bottom wall of the box body 3. In this way, when the battery cell 1 experiences thermal runaway, high-temperature gas or flame can be released to the bottom of the box 3 through the explosion-proof valve 300.

[0090] By utilizing the battery cells 1, 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.

[0091] As shown in FIG. 9 and FIG. 10 , a vehicle 4 according to an embodiment 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 on the 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 first aspect of the present disclosure, and the battery cell 1 is mounted on the body of the vehicle 4 or the chassis of the vehicle 4. That is, the battery cell 1 can be directly mounted on the body of the vehicle 4 or the chassis of the vehicle 4. Alternatively, the battery cell 1 is mounted in a box 3 and assembled into a battery pack 2, and the battery pack 2 is mounted on the body of the vehicle 4 or the chassis of the vehicle 4 by a box 3.

[0092] By utilizing the battery cell 1 or battery pack, the vehicle 4 according to the embodiment of the present disclosure has the advantages of high safety, smooth gas flow, and good anti-explosion effect.

[0093] In some specific embodiments of the present disclosure, the battery cell 1 or battery pack 2 is mounted on the body of the vehicle 4 or the chassis of the vehicle 4, and the first side wall 120 is positioned above the second side wall 130.

[0094] 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 face in a direction away from the passenger compartment of the vehicle 4. In the event of thermal runaway of the battery cell 1, high-temperature gas or flame can be discharged in a direction away from the passenger compartment of the vehicle 4 through the explosion-proof valve 300, thereby preventing the flame from being directly discharged into the car, thus reducing the possibility of injury to the vehicle passengers, and further protecting the safety of the vehicle passengers.

[0095] Other configurations and operations of the battery cells 1, battery packs 2, and vehicles 4 according to embodiments of the present disclosure are known to those skilled in the art and will not be described in detail herein.

[0096] In the description herein, references to terms such as "one embodiment," "some embodiments," "exemplary embodiments," "examples," "particular examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, exemplary references to the aforementioned terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0097] While embodiments of the present disclosure have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of the present disclosure being as defined by the appended claims and their equivalents. [Explanation of symbols]

[0098] 1 Battery Cell 100 Case 110 Lumen 120 First side wall 130 Second Side Wall 131 First protrusion 132 Second protrusion 140 First recess 141 Main gas passage 150 Second recess 151 Branch gas passage 160 Explosion proof hole 170 Main unit 180 Case cover 200 Terminal Post 210 Positive terminal post 220 Negative terminal post 300 Explosion-proof valve 400 Electrode core 500 Quarantine Film 2 Battery pack 3. Box 4. Vehicles

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) that are opposite each other, the inner wall surface of the second side wall (130) being configured with a first recess (140) and a plurality of second recesses (150), the first recess (140) and the second recess (150) being recessed in a direction away from the inner cavity (110), the first recess (140) and the second recess (150) being recessed in a direction away from the inner cavity (110), a housing (100) in which the recess (140) forms a main gas passage (141) in the inner cavity (110), the plurality of second recesses (150) form a plurality of branch gas passages (151) in the inner cavity (110), the plurality of branch gas passages (151) are each in communication with the main gas passage (141), and the second side wall (130) is provided with explosion-proof holes (160) that positionally correspond to the main gas passages (141); 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 mounted on the second side wall (130), the explosion-proof valve (300) being configured to cover the explosion-proof hole (160); A battery cell (1) comprising: an electrode core (400), the electrode core (400) being disposed within the housing (100), the electrode core (400) being spaced apart from the explosion-proof hole (160).

2. 2. The battery cell (1) of claim 1, wherein the main gas passage (141) and the plurality of branch gas passages (151) are arranged at least in the length direction of the second side wall (130), and a dimension of the main gas passage (141) in the width direction of the second side wall (130) is greater than each dimension of the branch gas passages (151) in the width direction of the second side wall (130).

3. 3. The battery cell (1) of claim 1 or 2, wherein the main gas passage (141) extends along the width direction of the second side wall (130), each of the branch gas passages (151) extends along the length direction of the second side wall (130), and the multiple branch gas passages (151) are distributed on two sides of the main gas passage (141) in the length direction of the second side wall (130).

4. a plurality of branch gas passages (151) are disposed on each side of the main gas passage (141) in the length direction of the second side wall (130), the plurality of branch gas passages (151) being spaced apart along the width direction of the second side wall (130); an equal number of the branch gas passages (151) are disposed on the two sides of the main gas passage (141) in the length direction of the second side wall (130); 4. The battery cell (1) according to claim 1, wherein the branch gas passages (151) on the two sides of the main gas passage (141) in the longitudinal direction of the second side wall (130) are arranged in a one-to-one correspondence.

5. 5. A battery cell (1) according to any one of claims 1 to 4, wherein an outer wall surface of the second side wall (130) is configured with a first protrusion (131), the first protrusion (131) protrudes in a direction away from the inner cavity (110), the first protrusion (131) corresponds in position to the first recess (140), and the explosion-proof hole (160) penetrates the first protrusion (131) and the first recess (140).

6. 6. The battery cell (1) of claim 5, wherein the outer wall surface of the second side wall (130) is configured with a plurality of second protrusions (132), each of which protrudes in a direction away from the inner cavity (110), and the plurality of second protrusions (132) positionally correspond to the plurality of second recesses (150) in a one-to-one correspondence.

7. The battery cell (1) of claim 6, wherein the first protrusion (131) and the first recess (140) are positioned at the center of the second side wall (130) in the longitudinal direction of the second side wall (130).

8. The depth of the main gas passage (141) is in the range of 0.5 mm to 3 mm; The battery cell (1) according to any one of claims 1 to 7, wherein the depth of each of the branch gas passages (151) is in the range of 0.5 mm to 3 mm.

9. 9. A battery cell (1) according to any one of claims 1 to 8, comprising a plurality of electrode cores (400) arranged in sequence, the arrangement direction of the plurality of electrode cores (400) coinciding with the thickness direction of the electrode cores (400), and each of the electrode cores (400) corresponding to at least one branch gas passage (151).

10. The dimension of the electrode core (400) in the longitudinal direction of the second side wall (130) is L １ and the maximum length of the first recess (140) and the plurality of second recesses (150) on the second side wall (130) is L ２ And L １ and L ２ However, 0.04≦L ２ / L １ The battery cell (1) according to any one of claims 1 to 9, wherein the battery cell (1) satisfies a resistance of ≦0.

96.

11. L １ and L ２ But, L １ ≦500 mm, and L ２ 11. The battery cell (1) of claim 10, further satisfying ≧20 mm.

12. The main gas passage (141) is located at the center of the electrode core (400) in the longitudinal direction of the second side wall (130), The explosion-proof hole (160) is located at the center of the main gas passage (141), The battery cell (1) according to any one of claims 1 to 11, wherein the explosion-proof hole (160) is positioned at the center of the electrode core body (400) in the thickness direction of the electrode core body (400).

13. 13. The battery cell (1) of claim 1, further comprising an isolator film (500), the isolator film (500) being disposed in the cavity (110), the isolator film (500) being positioned between at least a portion of the cavity (110) and the explosion-proof valve (300).

14. 14. The battery cell (1) of any one of claims 1 to 13, 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.

15. 14. The battery cell (1) of any one of claims 1 to 13, 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.

16. The housing (100) A housing body (170), the second side wall (130) and the inner cavity (110) are formed in the housing body (170), the housing body (170) has an opening facing the second side wall (130), and the opening communicates with the inner cavity (110); 16. The battery cell (1) of claim 1, further comprising: a housing cover (180), the housing cover (180) being mounted on the housing body (170), the housing cover (180) covering the inner cavity (110), the first side wall (120) being formed in the housing cover (180), and the terminal post (200) being connected to the housing cover (180).

17. A battery pack (2), Box (3), A battery pack (2) comprising: a battery cell (1) according to any one of claims 1 to 16, the battery cell (1) being mounted in the box (3) with the explosion-proof valve (300) facing a bottom wall of the box (3).

18. A vehicle (4) comprising a battery cell (1) as described in any one of claims 1 to 16 or a battery pack (2) as described in claim 17, wherein the first side wall (120) is positioned above the second side wall (130).

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