Battery cell and battery pack

Abstract

The application relates to the battery technical field and specifically discloses a battery monomer, which comprises a top cover structure and an electrode assembly; the top cover structure comprises a top cover sheet, a pole column assembly, a plastic part and a separation piece; the pole column assembly is arranged on the top cover sheet; the plastic part is arranged on one side of the top cover sheet; a separation groove is arranged on the side of the plastic part away from the top cover sheet; the separation piece is arranged in the separation groove and connected with the plastic part; the electrode assembly comprises a winding core body and a tab; the winding core body is arranged in a spaced mode with the top cover sheet; the winding core body is connected with the separation piece; the tab is arranged on one side of the winding core body close to the top cover sheet; at least part of the tab extends into the separation groove and is connected with the pole column assembly. The application further discloses a battery pack. The separation piece can increase the contact area of the winding core body and the top cover structure, effectively supports the winding core body, and separates the tab from the winding core body, so that the winding core body is prevented from being damaged by the tab.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] With the increasing number of application scenarios for power batteries, such as the inverted cell scenario to prevent high-temperature materials inside the cell from directly impacting the passenger compartment, higher requirements are being placed on the safety and reliability of battery use. Currently, in the inverted cell scenario, the support of the electrode assembly relies entirely on the cell cover plate. The existing cell cover plate has a limited contact area with the electrode assembly, which cannot provide good support for the electrode assembly in the inverted cell scenario. Under vibration conditions, the electrode plates are easily damaged, and under vibration and pressure, the tabs are more likely to insert into the cell, leading to a short circuit. Summary of the Invention

[0003] The technical problem this application aims to solve is: how to address the issue that the cover plate cannot provide adequate support for the core in existing inverted battery cell scenarios.

[0004] To address the aforementioned technical problems, this application provides a battery cell with a third-party orientation, comprising: A top cover structure includes a top cover sheet, an electrode assembly, a plastic part, and an insulating part; the electrode assembly is disposed through the top cover sheet along the third direction, the plastic part is disposed on one side of the top cover sheet along the third direction, and the electrode assembly is at least partially inserted through the plastic part; along the third direction, an insulating groove is provided on the side of the plastic part away from the top cover sheet, and the insulating part is disposed in the insulating groove and connected to the plastic part; An electrode assembly includes a core body and an electrode tab. Along the third direction, the core body is spaced apart from the top cover sheet, and the core body is simultaneously connected to the plastic part and the spacer on one side along the third direction. Along the third direction, the electrode tab is located on the side of the core body near the top cover sheet, and at least a portion of the electrode tab is located between the spacer and the plastic part. The electrode tab is connected to the electrode post assembly.

[0005] More preferably, the battery cell also has a first direction perpendicular to the third direction; The plastic part includes a main body, a first protrusion, and a second protrusion; the main body is connected to the top cover sheet along the third direction near the separator. Along the third direction, the first protrusion and the second protrusion are provided on the side of the main body away from the top cover plate; along the first direction, the first protrusion and the second protrusion are spaced apart; Along the third direction, the isolation member is spaced apart from the main body, and the two opposite ends of the isolation member along the first direction are respectively connected to the first protrusion and the second protrusion; The main body, the first protrusion, and the second protrusion together form the isolation groove.

[0006] More preferably, the first protrusion is provided with a first slot, and the second protrusion is provided with a second slot; the isolation member is provided with a first buckle on one side along the first direction and a second buckle on the other side; Along the third direction, the first buckle is engaged with the first card slot, and the second buckle is engaged with the second card slot; or, the first buckle is engaged with the second card slot, and the second buckle is engaged with the first card slot.

[0007] More preferably, the isolation member has a flat portion, and along the third direction, the flat portion has a second end face on the side away from the top cover plate, the first protrusion has a third end face on the side away from the top cover plate, and the second protrusion has a fourth end face on the side away from the top cover plate, and the second end face, the third end face, and the fourth end face are located in the same plane. The core body is provided with a first top wall on one side along the third direction, and the first top wall is connected to the second end face, the third end face and the fourth end face respectively.

[0008] More preferably, the battery cell also has a second direction that is perpendicular to both the first direction and the third direction; The isolation member also has a bending portion, and the bending portion is provided on both sides of the flat portion along the second direction; along the third direction, the bending portion is located between the first top wall and the main body portion, and at least a portion of the electrode tab is located between the bending portion and the electrode post assembly.

[0009] More preferably, the electrode tab has a first connecting portion and a second connecting portion connected to each other, the first connecting portion being connected to the core body, and the second connecting portion being connected to the pole assembly; along the third direction, the bending portion is located between the second connecting portion and the first top wall, and the bending portion is spaced apart from the second connecting portion and the first top wall respectively.

[0010] More preferably, along the third direction, the orthographic projection of the second connecting portion at least partially overlaps with the orthographic projection of the flattening portion.

[0011] More preferably, along the second direction, the bent portion and the first connecting portion are spaced apart.

[0012] More preferably, the top cover plate is provided with a liquid injection hole, which penetrates the top cover plate along the third direction; The isolation element is provided with a flow hole, which is spaced apart from the injection hole along the third direction.

[0013] More preferably, the electrode tab includes a first electrode tab and a second electrode tab, the first electrode tab and the second electrode tab are spaced apart and both are electrically connected to the core body, and the electrode polarities of the first electrode tab and the second electrode tab are opposite; The electrode assembly includes a first electrode assembly and a second electrode assembly, the first electrode assembly and the second electrode assembly are spaced apart and both pass through the top cover and the plastic part; the first electrode tab is electrically connected to the first electrode assembly, and the second electrode tab is electrically connected to the second electrode assembly; The isolation element includes a first isolation element and a second isolation element, both of which are connected to the plastic part; along the third direction, the first electrode tab is at least partially located between the first isolation element and the plastic part, and the second electrode tab is at least partially located between the second isolation element and the plastic part; The battery cell also includes: A housing having a receiving cavity, wherein the electrode assembly is disposed within the receiving cavity; The housing has an opening on one side along the third direction, the opening is in communication with the receiving cavity, and the top cover structure is connected to the housing and seals the opening.

[0014] This application also proposes a battery pack including the battery cells described above, the battery pack further including a housing, the housing having a placement cavity, and the battery cells disposed in the placement cavity; Along the third direction, the housing has a top wall and a bottom wall spaced apart; Along the third direction, the electrode assembly is disposed facing the bottom wall; the battery cell and the top wall are spaced apart along the third direction.

[0015] Compared with the prior art, the battery cell proposed in this application has the following advantages: This application provides an isolation groove along a third direction on the side of the plastic part facing the electrode assembly, and arranges an isolation member within the isolation groove. On the one hand, in the scenario of the battery cell being inverted, the isolation member, after being connected to the plastic part, can increase the contact area between the core body and the top cover structure, providing effective support for the core body and preventing damage to the electrode tab under vibration conditions. On the other hand, at least a portion of the electrode tab extends into the isolation groove, and the isolation member can separate the electrode tab from the core body, preventing the electrode tab from inserting into the core body when the electrode tab is vibrating and under pressure, thereby improving the safety of the core body. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the battery cell described in this application.

[0017] Figure 2 This is an exploded view of the battery cell described in this application.

[0018] Figure 3 This is a schematic diagram of the top cover structure described in this application.

[0019] Figure 4 This is an exploded view of the top cover structure described in this application.

[0020] Figure 5 This is a schematic diagram of the assembly of the top cover and the plastic part described in this application.

[0021] Figure 6 This is a schematic diagram of the structure of the isolation component described in this application.

[0022] Figure 7 This is a bottom view of the top cover structure described in this application.

[0023] Figure 8 This application Figure 7 Partial sectional view of section AA in the middle.

[0024] Figure 9 This is a front view of the battery cell described in this application.

[0025] Figure 10 This application Figure 9 Sectional view of section BB.

[0026] Figure 11 This application Figure 10 Enlarged diagram of point C in the middle.

[0027] Figure 12 This is a cross-sectional view of the separator described in this application along section BB.

[0028] Figure 13 This is a schematic diagram of the battery pack described in this application.

[0029] Figure 14 This is a cross-sectional view of the battery pack described in this application.

[0030] Figure label: 100. Battery cell; 10. Top cover structure; 11. Top cover piece; 111. First end face; 112. Injection hole; 12. Terminal assembly; 12a. First terminal assembly; 12b. Second terminal assembly; 13. Plastic part; 131. Isolation groove; 132. Main body; 133. First protrusion; 133a. First slot; 133b. Third end face; 134. Second protrusion; 134a. Second slot; 134b. Fourth end face; 14. Isolator; 14a. First isolation component; 14b. Second isolation component; 141. First buckle; 142. Second buckle; 143. Flat part; 143a. Second end face; 144. Bending part; 145. Downflow hole; 20. Electrode assembly; 21. Core body; 211. First top wall; 22. Electrode tab; 22a. First electrode tab; 22b. Second electrode tab; 221. First connecting part; 222. Second connecting part; 30. Shell; 301. Receiving cavity; 302. Opening; 200. Box body; 201. Placement cavity; 202. Top wall; 203. Bottom wall; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0031] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0032] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] Example 1 like Figure 1 As shown, this embodiment proposes a battery cell with two perpendicular directions X, Y, and Z. For ease of explanation, the length direction of the battery cell is defined as the first direction X, the width direction of the battery cell is defined as the second direction Y, and the height direction of the battery cell is defined as the third direction Z.

[0038] In some implementations, such as Figure 2 As shown, the battery cell includes a top cover structure 10, an electrode assembly 20, and a housing 30; wherein, the housing 30 has a receiving cavity 301, and the electrode assembly 20 is disposed in the receiving cavity 301; the housing 30 has an opening 302 on one side along the third direction Z, the opening 302 is connected to the receiving cavity 301, the top cover structure 10 is connected to the housing 30 and seals the opening 302.

[0039] In some implementation methods, please refer to Figure 3 and Figure 4The top cover structure 10 includes a top cover sheet 11, an electrode assembly 12, and a plastic part 13. Specifically, the top cover sheet 11 is connected to the housing 30 and seals the opening 302, so that the receiving cavity 301 forms a sealed cavity to ensure the airtightness of the entire battery cell and improve safety performance. The electrode assembly 12 is disposed through the top cover sheet 11 and the plastic part 13 along the third direction Z. The electrode assembly 20 includes a core body 21 and an electrode tab 22. The electrode tab 22 is disposed on the side of the core body 21 near the top cover sheet 11 along the third direction Z. Along the third direction Z, at least a portion of the electrode tab 22 is located between the separator 14 and the plastic part 13. The electrode tab 22 is used to connect the core body 21 and the electrode assembly 12 to realize the connection between the core body 21 and the electrode assembly 12. External electrical connection; to achieve insulation between the top cover sheet 11 and the core body 21, the core body 21 and the top cover sheet 11 are spaced apart. The top cover sheet 11 has a first end face 111 on the side closer to the core body 21 along the third direction Z. The plastic part 13 is connected to the first end face 111, that is, the plastic part 13 is disposed between the core body 21 and the top cover sheet 11. The plastic part 13 can isolate the top cover sheet 11 and the core body 21, thereby achieving insulation between the two and avoiding short circuits that could cause thermal runaway of the battery cell. In this embodiment, the core body 21 is at least partially connected to the plastic part 13 along the third direction Z. When the battery cell is inverted, the plastic part 13 can support the core body 21.

[0040] In some embodiments, due to the increased current and power requirements of the core body 21, the size of the tab 22 is generally relatively large, resulting in a limited contact area between the plastic part 13 and the core body 21, which cannot effectively support the core body 21 in the battery inverted scenario. Therefore, in this embodiment, the battery cell also includes a separator 14. Along the third direction Z, the plastic part 13 has a separator groove 131 on the side away from the top cover sheet 11. The separator 14 is disposed in the separator groove 131, and the core body 21 can be connected to both the separator 14 and the plastic part 13 simultaneously. Thus, after the separator 14 is connected to the plastic part 13, it can increase the contact area between the core body 21 and the top cover structure 10, improving the top cover structure 10's performance in the battery inverted scenario. The cover structure 10 provides effective support for the core body 21 under stress conditions, preventing damage to the tab 22 under vibration. Specifically, to reserve space for the connection between the tab 22 and the pole assembly 12, the two ends of the isolator 14 opposite to each other along the first direction X are connected to the plastic part 13, and the two sides of the isolator 14 opposite to each other along the second direction Y are spaced apart from the plastic part 13. This allows at least a portion of the tab 22 to extend into the isolation groove 131 and connect to the pole assembly 12, thereby avoiding interference with the assembly. At the same time, the isolator 14 can separate the tab 22 from the core body 21, preventing the tab 22 from being inserted into the core body 21 when the tab 22 is vibrating and under pressure, thereby improving the safety of the core body 21.

[0041] In some implementations, such as Figure 2 As shown, the electrode tab 22 includes a first electrode tab 22a and a second electrode tab 22b. The first electrode tab 22a and the second electrode tab 22b are spaced apart along the first direction X and are both electrically connected to the core body 21. It should be noted that the electrode polarities of the first electrode tab 22a and the second electrode tab 22b are opposite. For example, the first electrode tab 22a is a positive electrode tab and the second electrode tab 22b is a negative electrode tab, or the first electrode tab 22a is a negative electrode tab and the second electrode tab 22b is a positive electrode tab.

[0042] To meet the connection requirements of the first tab 22a and the second tab 22b, such as Figure 3 and Figure 4 As shown, the terminal assembly 12 of the battery cell includes a first terminal assembly 12a and a second terminal assembly 12b. The first terminal assembly 12a and the second terminal assembly 12b are spaced apart along a first direction X, and both the first terminal assembly 12a and the second terminal assembly 12b are connected through the top cover plate 11 and the plastic part 13. The first tab 22a is electrically connected to the first terminal assembly 12a, and the second tab 22b is electrically connected to the second terminal assembly 12b. Thus, by setting the first terminal assembly 12a and the second terminal assembly 12b, the current of the core body 21 can be led out to the outside.

[0043] In some embodiments, to facilitate the assembly of the spacer 14 and the plastic part 13, such as Figure 5 As shown, the plastic part 13 includes a main body 132, a first protrusion 133, and a second protrusion 134. The main body 132 is connected to the top cover plate 11 on the side closer to the isolator 14 along the third direction Z. Along the third direction Z, the first protrusion 133 and the second protrusion 134 are located on the side of the main body 132 away from the top cover plate 11. Along the first direction X, the first protrusion 133 and the second protrusion 134 are spaced apart, and the two opposite ends of the isolator 14 along the first direction X are respectively connected to the first protrusion 133 and the second protrusion 134. By setting the first protrusion 133 and the second protrusion 134, after the isolator 14 is connected to the plastic part 13, the isolator 14 and the main body 132 can be spaced apart in the third direction Z, so as to facilitate the connection between the tab 22 and the pole assembly 12, and to isolate the tab 22 from the core body 21, so as to avoid damage to the core body 21 when the tab 22 is vibrating and compressed, thereby improving the safety of the core body 21.

[0044] It should be noted that the main body 132, the first protrusion 133, and the second protrusion 134 together form the isolation groove 131.

[0045] In some embodiments, there are two second protrusions 134 along the first direction X, with a first protrusion 133 located between the two second protrusions 134, thereby ensuring the supporting balance of the plastic part 13 on the core body 21; further, the spacer 14 includes a first spacer 14a and a second spacer 14b, such as Figure 4 As shown, both the first isolation member 14a and the second isolation member 14b are connected to the plastic part 13. Specifically, the first isolation member 14a is connected to the first protrusion 133 and one of the second protrusions 134, and the second isolation member 14b is connected to the first protrusion 133 and the other second protrusion 134. Along the third direction Z, the first tab 22a is at least partially located between the first isolation member 14a and the plastic part 13, and the second tab 22b is at least partially located between the second isolation member 14b and the plastic part 13. Thus, by setting two isolation members 14, the size of the isolation member 14 along the first direction X can be reduced, thereby reducing the deformation of the isolation member 14 along the third direction Z and improving the support strength of the isolation member 14. At the same time, along the first direction X, the second protrusion 134, the isolation member 14, and the first protrusion 133 are alternately arranged, which can further improve the support performance of the top cover structure 10 on the core body 21.

[0046] In some embodiments, to simplify the assembly of the spacer 14 and the plastic part 13 and improve assembly efficiency, please refer to... Figures 5-8 The first protrusion 133 is provided with a first slot 133a, and the second protrusion 134 is provided with a second slot 134a; the isolation member 14 is provided with a first buckle 141 on one side along the first direction X, and a second buckle 142 on the other side; along the third direction Z, the first buckle 141 is engaged with the first slot 133a, and the second buckle 142 is engaged with the second slot 134a; by using slots and buckles, the isolation member 14 and the plastic part 13 can be quickly fastened together, making assembly simple and efficient.

[0047] In another embodiment, the first latch 141 is engaged with the second latch 134a, and the second latch 142 is engaged with the first latch 133a.

[0048] In other embodiments, to improve the connection between the isolator 14 and the plastic part 13, a plurality of first slots 133a, such as two, three, or four, can be provided on the first protrusion 133, and a second slot 134a can also be provided on the second protrusion 134. Similarly, the number of first buckles 141 corresponds one-to-one with the number of first slots 133a, and the number of second buckles 142 corresponds one-to-one with the number of second slots 134a, thereby increasing the number of connection points between the isolator 14 and the plastic part 13, improving the connection strength, and preventing the isolator 14 from falling off under vibration conditions.

[0049] In some implementations, to increase the contact area between the spacer 14 and the core body 21, thereby improving the support effect in battery inversion scenarios, such as... Figures 6-8 As shown, the separator 14 has a flattening portion 143, and the core body 21 is connected to the flattening portion 143 along the third direction Z. Specifically, along the third direction Z, the flattening portion 143 has a second end face 143a on the side away from the top cover plate 11, and the core body 21 has a first top wall 211 on the side along the third direction Z. The first top wall 211 is connected to the second end face 143a, so that the second end face 143a can provide effective support for the core body 21.

[0050] Furthermore, since the spacer 14 and the plastic part 13 are connected by a snap-fit ​​mechanism, to prevent the entire weight of the core body 21 from acting on the spacer 14 and causing deformation of the spacer 14, therefore, as follows: Figure 8 As shown, the first protrusion 133 has a third end face 133b on the side away from the top cover plate 11, and the second protrusion 134 has a fourth end face 134b on the side away from the top cover plate 11. The second end face 143a, the third end face 133b and the fourth end face 134b are located on the same plane. The first top wall 211 is connected to the second end face 143a, the third end face 133b and the fourth end face 134b respectively, so that the separator 14 and the plastic part 13 jointly support the core body 21, ensuring that the entire top cover structure 10 is subjected to balanced force. Moreover, the separator 14 is located entirely in the separator groove 131, which can avoid reducing the space utilization rate of the core body 21 due to the addition of the separator 14.

[0051] In some implementation methods, please refer to Figure 6 and Figures 9-11 The separator 14 also has a bending portion 144. The flattening portion 143 has bending portions 144 on both sides opposite to each other along the second direction Y. Along the third direction Z, the bending portion 144 is located between the first top wall 211 and the main body portion 132, and at least a portion of the tab 22 is located between the bending portion 144 and the pole post assembly 12. Thus, the bending portion 144 can prevent the tab 22 from damaging the core body 21 when inserted. In addition, the bending portion 144 can assist in bending the tab 22.

[0052] In some implementations, such as Figure 12As shown, the bent portion 144 is inclined within the isolation groove 131. This design prevents the bent portion 144 from contacting the first top wall 211. When the tab 22 vibrates and deforms, it can first contact the bent portion 144, utilizing the deformation of the bent portion 144 to absorb energy, thereby reducing the degree of damage to the tab 22. Furthermore, after being subjected to force, the bent portion 144 can contact the first top wall 211, further increasing the contact area between the entire isolation member 14 and the core body 21. This can further improve the support stress of the core body 21 under vibration conditions and prevent the tab 22 from deforming and damaging the core body 21. In addition, the bent portion 144 and the flattening portion 143 form an angle θ, satisfying: 120°≤θ<180°. This angle design allows the bent portion 144 to absorb energy when compressed, while preventing the angle of the bent portion 144 from being too large and damaging the tab 22. When 90°≤θ<120°, the bending part 144 is nearly perpendicular to the flat part 143, which can easily cause the tab 22 to be punctured and damaged by the bending part 144 when subjected to vibration. When θ<90°, the bending part 144 cannot play an isolation role, and the tab 22 is at risk of internal damage to the core body 21 when subjected to vibration.

[0053] In some implementation methods, please refer to Figure 11 The tab 22 has a first connecting portion 221 and a second connecting portion 222 connected to each other. The first connecting portion 221 is connected to the core body 21, and the second connecting portion 222 is connected to the terminal assembly 12. Along the third direction Z, the bending portion 144 is located between the second connecting portion 222 and the first top wall 211, and the bending portion 144 is spaced apart from the second connecting portion 222 and the first top wall 211 respectively. This allows at least a portion of the tab 22 to extend into the isolation groove 131 and connect to the terminal assembly 12. Without affecting the battery performance, the isolation member 14 can separate the second connecting portion 222 of the tab 22 from the first top wall 211 of the core body 21, thereby effectively preventing the second connecting portion 222 from inserting and damaging the core body 21 when subjected to vibration.

[0054] In some embodiments, along the third direction Z, the orthographic projection of the second connecting portion 222 and the orthographic projection of the flattening portion 143 at least partially overlap. Under vibration conditions, after the tab 22 deforms, it first contacts the bending portion 144. After the bending portion 144 deforms, the tab 22 then contacts the flattening portion 143. The flattening portion 143 can provide a flat and stable support surface, which ensures that the tab 22 will not tilt after deformation, thereby distributing the load and maintaining stability, and preventing the tab 22 from puncturing the insulating member 14.

[0055] In some implementations, such as Figure 11As shown, along the second direction Y, the bent portion 144 and the first connecting portion 221 are spaced apart, so that there is sufficient deformation space between the bent portion 144 and the first connecting portion 221, which effectively avoids the bent portion 144 from damaging the first connecting portion 221 when it is subjected to force, thus affecting the performance of the battery cell.

[0056] In some implementations, after battery assembly, to facilitate the precise, efficient, and safe injection of electrolyte into the cell, such as... Figure 3 As shown, the top cover plate 11 is provided with an injection hole 112. Along the third direction Z, the injection hole 112 penetrates the top cover plate 11, allowing the electrolyte to enter the receiving cavity 301 through the injection hole 112 and wet the core body 21. In the third direction Z, since the separator 14 is located between the core body 21 and the top cover plate 11, to prevent the separator 14 from blocking the injection of electrolyte, therefore, as shown... Figure 6 As shown, the isolation member 14 is provided with a flow hole 145, which is located at the connection between the flat part 143 and the bending part 144. Along the third direction Z, the flow hole 145 is spaced apart from the injection hole 112. By opening the flow hole 145, the electrolyte injected into the injection hole 112 can be guided to the core body 21, so as to avoid the isolation member 14 from affecting the injection of electrolyte.

[0057] In summary, the battery cell proposed in this embodiment has an isolation groove 131 provided on the side of the plastic part 13 facing the electrode assembly 20 along the third direction Z, and an isolation member 14 arranged in the isolation groove 131. On the one hand, in the scenario of cell inversion, the isolation member 14 can increase the contact area between the core body 21 and the top cover structure 10 after being connected to the plastic part 13, providing effective support for the core body 21 and avoiding damage to the tab 22 under vibration conditions. On the other hand, at least a portion of the tab 22 extends into the isolation groove 131, and the isolation member 14 can separate the tab 22 from the core body 21, preventing the tab 22 from inserting into the core body 21 when the tab 22 is vibrating and under pressure, thereby improving the safety of the core body 21.

[0058] Example 2 This embodiment proposes a battery pack, including the battery cell 100 of Embodiment 1, the difference being: like Figure 13 and Figure 14As shown, the battery pack in this embodiment also includes a housing 200, which has a placement cavity 201 in which the battery cell 100 is disposed. Along the third direction Z, the housing 200 has a top wall 202 and a bottom wall 203 spaced apart, and the placement cavity 201 is located between the top wall 202 and the bottom wall 203. Along the third direction Z, the terminal assembly 12 is disposed facing the bottom wall 203. The battery cell 100 and the top wall 202 are spaced apart along the third direction Z. This makes the battery cell 100 in an inverted state inside the housing 200, that is, the top cover structure 10 is located at the bottom of the battery cell 100. At this time, the plastic part 13 and the separator 14 can work together to effectively support the core body 21.

[0059] The above description is merely a preferred embodiment of this application. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application. The basic principles, main features, and advantages of this application have been shown and described above. For those skilled in the art, it is obvious that this application is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of this application is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this application.

[0060] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery cell (100) having a third orientation (Z), characterized in that, include: The top cover structure (10) includes a top cover sheet (11), a pole assembly (12), a plastic part (13), and an isolation part (14); the pole assembly (12) is disposed through the top cover sheet (11) along the third direction (Z), the plastic part (13) is disposed on one side of the top cover sheet (11) along the third direction (Z), and the pole assembly (12) is at least partially connected to the plastic part (13); along the third direction (Z), the side of the plastic part (13) away from the top cover sheet (11) is provided with an isolation groove (131), and the isolation part (14) is disposed in the isolation groove (131) and connected to the plastic part (13); The electrode assembly (20) includes a core body (21) and an electrode tab (22). Along the third direction (Z), the core body (21) is spaced apart from the top cover plate (11), and the core body (21) is connected to the plastic part (13) and the separator (14) on one side along the third direction (Z). Along the third direction (Z), the electrode tab (22) is located on the side of the core body (21) near the top cover plate (11), and at least a portion of the electrode tab (22) is located between the separator (14) and the plastic part (13). The electrode tab (22) is connected to the electrode post assembly (12).

2. A battery cell according to claim 1, characterized in that, The battery cell also has a first direction (X) perpendicular to the third direction (Z); The plastic part (13) includes a main body (132), a first protrusion (133), and a second protrusion (134); the main body (132) is connected to the top cover (11) on the side of the third direction (Z) close to the separator (14); Along the third direction (Z), the first protrusion (133) and the second protrusion (134) are provided on the side of the main body (132) away from the top cover (11); along the first direction (X), the first protrusion (133) and the second protrusion (134) are spaced apart. Along the third direction (Z), the isolation member (14) is spaced apart from the main body (132), and the two ends of the isolation member (14) opposite to each other along the first direction (X) are respectively connected to the first protrusion (133) and the second protrusion (134); The main body (132), the first protrusion (133), and the second protrusion (134) together form the isolation groove (131).

3. A battery cell according to claim 2, characterized in that, The first protrusion (133) is provided with a first slot (133a), and the second protrusion (134) is provided with a second slot (134a); the isolation member (14) is provided with a first buckle (141) on one side along the first direction (X) and a second buckle (142) on the other side. Along the third direction (Z), the first buckle (141) is engaged with the first slot (133a), and the second buckle (142) is engaged with the second slot (134a); or, the first buckle (141) is engaged with the second slot (134a), and the second buckle (142) is engaged with the first slot (133a).

4. A battery cell according to claim 2, characterized in that, The isolation member (14) has a flattening portion (143) along the third direction (Z). The flattening portion (143) has a second end face (143a) on the side away from the top cover plate (11), the first protrusion (133) has a third end face (133b) on the side away from the top cover plate (11), and the second protrusion (134) has a fourth end face (134b) on the side away from the top cover plate (11). The second end face (143a), the third end face (133b), and the fourth end face (134b) are located in the same plane. The core body (21) has a first top wall (211) on one side along the third direction (Z), and the first top wall (211) is connected to the second end face (143a), the third end face (133b) and the fourth end face (134b) respectively.

5. A battery cell according to claim 4, characterized in that, The battery cell also has a second direction (Y) that is perpendicular to both the first direction (X) and the third direction (Z); The isolation member (14) also has a bending portion (144), and the flattening portion (143) is provided on both sides opposite to each other along the second direction (Y); along the third direction (Z), the bending portion (144) is located between the first top wall (211) and the main body portion (132), and at least a portion of the pole tab (22) is located between the bending portion (144) and the pole post assembly (12).

6. A battery cell according to claim 5, characterized in that, The tab (22) has a first connecting part (221) and a second connecting part (222) connected to each other. The first connecting part (221) is connected to the core body (21), and the second connecting part (222) is connected to the pole assembly (12). Along the third direction (Z), the bending part (144) is located between the second connecting part (222) and the first top wall (211), and the bending part (144) is spaced apart from the second connecting part (222) and the first top wall (211) respectively.

7. A battery cell according to claim 6, characterized in that, Along the third direction (Z), the orthographic projection of the second connecting portion (222) at least partially overlaps with the orthographic projection of the flattening portion (143).

8. A battery cell according to claim 6, characterized in that, Along the second direction (Y), the bent portion (144) is spaced apart from the first connecting portion (221).

9. A battery cell according to claim 1, characterized in that, The top cover plate (11) is provided with an injection hole (112), which penetrates the top cover plate (11) along the third direction (Z). The isolation element (14) is provided with a downflow hole (145) along the third direction (Z), and the downflow hole (145) is spaced apart from the injection hole (112).

10. A battery cell according to any one of claims 1-9, characterized in that, The electrode tab (22) includes a first electrode tab (22a) and a second electrode tab (22b). The first electrode tab (22a) and the second electrode tab (22b) are spaced apart and are both electrically connected to the core body (21). The electrode polarities of the first electrode tab (22a) and the second electrode tab (22b) are opposite. The electrode assembly (12) includes a first electrode assembly (12a) and a second electrode assembly (12b). The first electrode assembly (12a) and the second electrode assembly (12b) are spaced apart and both pass through the top cover plate (11) and the plastic part (13). The first electrode tab (22a) is electrically connected to the first electrode assembly (12a), and the second electrode tab (22b) is electrically connected to the second electrode assembly (12b). The isolation member (14) includes a first isolation member (14a) and a second isolation member (14b), both of which are connected to the plastic part (13); along the third direction (Z), the first tab (22a) is at least partially located between the first isolation member (14a) and the plastic part (13), and the second tab (22b) is at least partially located between the second isolation member (14b) and the plastic part (13); The battery cell (100) also includes: The housing (30) has a receiving cavity (301) and the electrode assembly (20) is disposed in the receiving cavity (301); The housing (30) has an opening (302) on one side along the third direction (Z), the opening (302) is connected to the receiving cavity (301), and the top cover structure (10) is connected to the housing (30) and covers the opening (302).

11. A battery pack comprising a battery cell (100) according to any one of claims 1-10, characterized in that, The battery pack also includes a housing (200) having a placement cavity (201) in which the individual battery cells (100) are disposed; Along the third direction (Z), the housing (200) has a top wall (202) and a bottom wall (203) spaced apart. Along the third direction (Z), the pole assembly (12) is disposed on the side facing the bottom wall (203); the battery cell (100) and the top wall (202) are spaced apart along the third direction (Z).

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