Battery cell, battery, battery pack and vehicle

Abstract

The utility model relates to a battery cell, a battery, a battery pack and a vehicle. And the battery cell comprises a pole core and a pole lug. The pole core comprises a cover plate connecting surface and a side surface adjacent to the cover plate connecting surface in the width direction. And the pole core further comprises a concave part which is concave towards the interior of the pole core from the cover plate connecting surface and the side surface. And the pole lug is arranged in the concave part and is connected with the pole core. Wherein the size of the tab in the width direction is smaller than or equal to the concave depth of the concave part in the width direction. Through the arrangement, the battery cell can utilize the space of the concave part to increase the arrangement space of the tab, so that the area of the tab can be effectively increased. Therefore, the overcurrent capacity of the tabs is improved, and the temperature rise of the tabs in the charging and discharging process of the battery is effectively reduced, so that the service life of a battery cell can be prolonged, and the quick charging capacity and the safety performance of the battery are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a battery cell, a battery, a battery pack and a vehicle. BACKGROUND

[0002] With the popularity of new energy electric vehicles, people pay special attention to the endurance, charging speed, cycle life and safety of the battery. The properties related to the power battery are one of the core competences of electric vehicles, or the properties related to the power battery are one of the core properties that electric vehicles need to improve. From the perspective of users, it is embodied that higher requirements are put forward for the endurance, charging speed, cycle life and safety of the battery and other properties of electric vehicles.

[0003] At present, the battery mounted on the vehicle has a structure based on a blade battery. Due to the structural innovation of such a battery, the battery assembly formed by the battery can improve the volume utilization rate, and it is expected to pack more batteries in the same space, thereby improving the energy density of the battery assembly.

[0004] However, in such a battery, the tab side corresponding to the pole is usually a small area side, so the overcurrent area of the battery is limited, resulting in high temperature rise of the tab during charging and discharging. UTILITY MODEL CONTENT

[0005] The present application provides a battery cell, a battery, a battery pack and a vehicle to solve some or all of the deficiencies in the related art.

[0006] The first aspect of the present application provides a battery cell, comprising:

[0007] a pole core comprising a cover plate connecting surface and a side surface adjacent to the cover plate connecting surface in a width direction; the pole core further comprises a recessed portion recessed from the cover plate connecting surface and the side surface towards the inside of the pole core; and,

[0008] a tab disposed in the recessed portion and connected with the pole core;

[0009] wherein the size of the tab in the width direction is less than or equal to the recessed depth of the recessed portion in the width direction.

[0010] Further, the tab comprises a first tab portion and a second tab portion; the extension direction of the first tab portion is different from the extension direction of the second tab portion; the first tab portion is disposed in the recessed portion; and the second tab portion is disposed on the cover plate connecting surface and extends along the width direction.

[0011] Further, a dimension of the first ear in the width direction is a first width; a dimension of the second ear in the width direction is a second width; a dimension of the pole core in the width direction is a third width.

[0012] The sum of the first width and the second width is greater than half of the third width.

[0013] Further, the cover plate connecting surface includes two and is oppositely arranged; the side surface includes two and is oppositely arranged; a connecting position of each of the cover plate connecting surface and the side surface is provided with a recess; each recess is provided with a tab.

[0014] The second aspect of the present application provides a battery, including a shell, a cover plate and the pole core as described in the foregoing embodiments; the pole core is arranged in a containing space inside the shell; the cover plate is connected with the shell at the cover plate connecting surface and includes a pole post; the pole post is connected with the tab.

[0015] Further, the battery further includes a connecting sheet connected with the tab and the pole post; the connecting sheet covers the tab.

[0016] Further, the connecting sheet includes a first connecting part and a second connecting part; an extension direction of the first connecting part is different from an extension direction of the second connecting part; the first connecting part is arranged to connect the recess and the tab; the second connecting part is arranged between the pole core and the cover plate and extends towards the inside of the pole core along the width direction; the second connecting part is connected with the pole post.

[0017] Further, the connecting sheet is arranged as a multi-layer composite structure formed by stacking multiple connecting layers; and / or,

[0018] The thickness of the connecting sheet is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

[0019] Further, the cover plate includes a first cover body and a second cover body; the cover plate connecting surface includes a first connecting surface and a second connecting surface arranged oppositely; the first cover body is connected with the shell at the first connecting surface side; the second cover body is connected with the shell at the second connecting surface side.

[0020] The first cover body is provided with a liquid injection hole; the second cover body is provided with an explosion-proof valve; wherein,

[0021] The tab includes a first negative tab arranged at the first connecting surface side and a second negative tab arranged at the second connecting surface side; a dimension of the first negative tab in the width direction is greater than a dimension of the second negative tab in the width direction.

[0022] The third aspect of the present application provides a battery pack comprising the battery described in the foregoing embodiments.

[0023] The fourth aspect of the present application provides a vehicle comprising the battery pack described in the foregoing embodiments.

[0024] The technical solutions provided by the embodiments of the present application can have the following beneficial effects:

[0025] As can be seen from the above embodiments, the battery cell of the present application can use the space of the recessed part to increase the setting space of the tab, so that the area of the tab can be effectively increased. In this way, the overcurrent capacity of the tab is increased, and the temperature rise of the tab during the charging and discharging process of the battery is effectively reduced, thereby improving the service life of the battery cell and improving the fast charging capacity and safety performance of the battery.

[0026] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 A simplified exploded schematic diagram of an embodiment of the battery of the present application is shown.

[0029] Figure 2 A simplified overall schematic diagram of an embodiment of the battery of the present application is shown. Figure 1 A simplified overall schematic diagram of the tab of the embodiment shown.

[0030] Figure 3 A simplified overall schematic diagram of the battery cell of the embodiment shown. Figure 1 A simplified overall schematic diagram of the battery cell of the embodiment shown.

[0031] Figure 4 A simplified overall schematic diagram of another embodiment of the battery cell of the present application is shown.

[0032] Explanation of reference signs:

[0033] 100 battery, 110 cell, 111 electrode core, 1111 cover plate connecting surface, 1111a first connecting surface, 1111b second connecting surface, 1112 side surface, 1113 recessed part, 112 tab, 1121 first ear, 1122 second ear, 1123a first negative electrode ear, 1123b second negative electrode ear, 1124a first positive electrode ear, 1124b second positive electrode ear, 120 shell, 130 cover plate, 130a first cover body, 130b second cover body, 131 pole, 140 connecting sheet, 141 first connecting part, 142 second connecting part, 150 flexible spacer, W1 width of the first negative electrode ear, W2 width of the second negative electrode ear, D1 first width, D2 second width, D3 third width, X width direction, Y length direction. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments (or, the implementation manners) of the present application will be clearly and completely described below with reference to the drawings. When the following description refers to the drawings, the same or similar elements in different drawings are denoted by the same reference numerals unless otherwise indicated.

[0035] If the present application involves directional indications or positional relationships in the embodiments (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a certain posture (as shown in the drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. in the embodiments of the present application are only used for convenience of description, and cannot be understood as indicating or implying relative importance.

[0036] Reference Figure 1 The present application provides a battery 100. The battery 100 includes a cell 110, a shell 120, and a cover plate 130. The cell 110 is arranged in a containing space inside the shell 120. The cover plate 130 is connected with the shell 120, thereby keeping the cell 110 in the shell 120. In combination with Figure 2 and Figure 3 The cell 110 includes an electrode core 111 and a tab 112. The electrode core 111 includes a cover plate connecting surface 1111 and a side surface 1112 adjacent to the cover plate connecting surface 1111 in the width direction X. The cover plate 130 is connected with the shell 120 at the cover plate connecting surface 1111. The electrode core 111 is connected with the tab 112, thereby leading out the positive and negative electrodes in the electrode core 111. The cover plate 130 includes a pole 131. The pole 131 is connected with the tab 112, thereby enabling the battery 100 to provide external electrical energy through the pole 131.

[0037] In some battery cells 110, the tab 112 is arranged on the cover connecting surface 1111. However, since the cover connecting surface 1111 needs to be connected with the cover 130 later, the space for arranging the tab 112 is limited, which may cause the area of the tab 112 to be insufficient, resulting in serious heating of the tab 112 during the charging and discharging process of the battery 100.

[0038] The pole core 111 of the present application further comprises a recessed part 1113 recessed from the cover connecting surface 1111 and the side surface 1112 towards the inside of the pole core 111. In other words, the connection position of the cover connecting surface 1111 and the side surface 1112 is recessed towards the inside of the pole core 111. The tab 112 is arranged on the recessed part 1113. The dimension of the tab 112 in the width direction X is less than or equal to the recessed depth of the recessed part 1113 in the width direction X. That is, the tab 112 does not exceed the side surface 1112 in the width direction X.

[0039] By such an arrangement, the battery cell 110 can use the space of the recessed part 1113 to increase the arrangement space of the tab 112, so that the area of the tab 112 can be effectively increased. In this way, the overcurrent capacity of the tab 112 is increased, and the temperature rise of the tab 112 during the charging and discharging process of the battery 100 is effectively reduced, thereby improving the service life of the battery cell 110 and improving the fast charging capability and safety performance of the battery 100.

[0040] The dimension of the tab 112 in the width direction X being less than or equal to the recessed depth of the recessed part 1113 in the width direction X can be understood as that the tab 112 is flush with the side surface 1112, or the tab 112 can have a distance from the side surface 1112 in the width direction X. Such an arrangement makes it unnecessary to bend the tab 112 in the width direction X to adapt to the shell 120 when the battery cell 110 is assembled with the shell 120. At the same time, compared with the technical solution of protruding the tab 112 as a whole on the side surface 1112, the arrangement of the recessed part 1113 can effectively ensure the volume of the pole core 111 on the basis of expanding the area of the tab 112, thereby ensuring the performance of the battery 100.

[0041] In some embodiments, the number of tabs 112 is two, thereby leading out the positive and negative electrodes inside the pole core 111. As shown in FIG. 1B, the two tabs 112 are arranged on the recessed part 1113. Figure 3As shown, in an optional embodiment, the cover plate connecting surface 1111 includes a first connecting surface 1111a and a second connecting surface 1111b oppositely arranged. Similarly, the side surface 1112 includes two oppositely arranged side surfaces. Since the side surface 1112 and the cover plate connecting surface 1111 are adjacent, the pole core 111 of this embodiment is actually a cuboid pole core 111. Each connecting position of the cover plate connecting surface 1111 and the side surface 1112 is provided with a recess 1113. Each recess 1113 is provided with a tab 112. In other words, the pole core 111 of this embodiment has four recesses 1113 and is correspondingly provided with four tabs 112. With the above arrangement, the first positive tab 1124a, the first negative tab 1123a, the second positive tab 1124b, and the second negative tab 1123b can be arranged in the shown embodiment. Figure 3

[0042] In order to assemble the battery 100 with the pole core 110 of this embodiment, the cover plate 130 includes a first cover body 130a and a second cover body 130b. The first cover body 130a is connected to the shell 120 on the side of the first connecting surface 1111a. The second cover body 130b is connected to the shell 120 on the side of the second connecting surface 1111b. Then, the first cover body 130a has two pole posts 131 connected to the first positive tab 1124a and the first negative tab 1123a, respectively. The second cover body 130b has two pole posts 131 connected to the second positive tab 1124b and the second negative tab 1123b, respectively.

[0043] In this way, when the battery 100 is assembled with the pole core 110 of this embodiment, the battery 100 is a four-pole post 131 battery 100. The increase in the number of pole posts 131 can share the current, thereby reducing the load of a single pole post 131, so that the current carrying capacity of the battery 100 is improved. At the same time, the dispersion of the current is conducive to reducing the local heating of the tab 112, which is conducive to prolonging the service life of the battery 100.

[0044] In some embodiments, the first cover body 130a is provided with a liquid injection hole (not shown), so that it can be used for later supplement of electrolyte in the pole core 111. The second cover body 130b is provided with an explosion-proof valve (not shown) for preventing explosion or rupture caused by excessive internal pressure of the battery 100, thereby improving safety performance. The first negative tab 1123a is arranged on the side of the first connecting surface 1111a. The second negative tab 1123b is arranged on the side of the second connecting surface 1111b. The dimension W1 of the first negative tab 1123a in the width direction X is greater than the dimension W2 of the second negative tab 1123b in the width direction X.

[0045] ​In order to make the explosion-proof valve and the liquid injection hole work normally, there needs to be a gap between the tab 112 and the explosion-proof valve and the liquid injection hole. Since the explosion-proof valve occupies a larger volume on the cover plate 130 than the liquid injection hole, the first connecting surface 1111a side of the first cover body 130a provided with the liquid injection hole can be provided with a larger tab 112 than the second connecting surface 1111b side. The embodiment sets the size W1 of the first negative tab 1123a to be larger than the size W2 of the second negative tab 1123b, which can reasonably use the space inside the battery 100 and increase the overcurrent capacity of the first negative tab 1123a, which is beneficial to further reduce the local heating of the first negative tab 1123a and improve the service life of the battery 100.

[0046] Of course, the first positive tab 1124a on the first connecting surface 1111a side of the cell 110 can also be larger than the second positive tab 1124b on the second connecting surface 1111b side. The present application does not limit this. The above embodiment describes the size of the first negative tab 1123a, because the current of the negative electrode is usually larger than that of the positive electrode during charging and discharging of the battery 100, so the larger first negative tab 1123a can better distribute the current and reduce local overheating. Therefore, in the limited space, the area of the negative tab can be set to be larger than that of the positive tab.

[0047] The tab 112 can be set as shown in Figure 3 The tab 112 is shown as a rectangle and is integrally accommodated in the recess 1113. Referring to Figure 4 In an optional embodiment, the tab 112 includes a first tab portion 1121 and a second tab portion 1122. The extension direction of the first tab portion 1121 is different from the extension direction of the second tab portion 1122. The first tab portion 1121 is arranged on the recess 1113. The second tab portion 1122 is arranged on the cover plate connecting surface 1111 and extends along the width direction X. It should be noted that the second tab portion 1122 extends along the width direction X, which should be understood as extending parallel to the width direction X (as shown in the embodiment of Figure 4 The extension direction of the second tab portion 1122 has a component in the width direction X.

[0048] By such arrangement, the tab 112 reasonably uses the space between the cover plate connecting surface 1111 and the cover plate 130, so that the area of the tab 112 is further increased. Such arrangement is beneficial to improve the overcurrent capacity of the tab 112, thereby reducing the temperature rise of the tab 112, and further improving the service life, fast charging capacity and safety performance of the cell 110.

[0049] The first ear 1121 has a first width D1 in the width direction X. The second ear 1122 has a second width D2 in the width direction X. The core 111 has a third width D3 in the width direction X. In an optional embodiment, the sum of the first width D1 and the second width D2 is greater than half of the third width D3. When the size of the core 111 in the width direction X increases, the width of the second ear 1122 and the first ear 1121 correspondingly increases. Conversely, when the size of the core 111 in the width direction X decreases, the width of the second ear 1122 and the first ear 1121 correspondingly decreases. In other words, the size of the first ear 1121 and the second ear 1122 changes with the size of the core 111. When the size of the core 111 increases, the discharge rate and the capacity and other parameters increase, and at the same time, the requirement for the heat dissipation performance of the tab 112 also correspondingly increases. Therefore, this embodiment relates the size of the tab 112 to the size of the core 111, thereby ensuring the overcurrent capacity of the tab 112 while reasonably controlling the volume of the tab 112.

[0050] In the above various embodiments, the cover plate 130 can be provided with a conductive structure to connect the pole 131 and the tab 112. Referring back to Figure 1 In an optional embodiment, the battery 100 further includes a connecting sheet 140 connected to the pole 131 and the tab 112. The connecting sheet 140 covers the tab 112. In this way, the contact area between the tab 112 and the connecting sheet 140 increases, improving the stability of the electrical conduction. The connection between the tab 112 and the connecting sheet 140 can be only a contact connection, or can also be a welding connection such as laser welding, thereby improving the stability of the connection and conduction.

[0051] Further, in an optional embodiment, the connecting sheet 140 includes a first connecting portion 141 and a second connecting portion 142. The extension direction of the first connecting portion 141 is different from the extension direction of the second connecting portion 142. The first connecting portion 141 is arranged to connect the tab 112 and the recessed portion 1113. The second connecting portion 142 is arranged between the core 110 and the cover plate 130 and extends towards the inside of the core 111 along the width direction X. The second connecting portion 142 is connected to the pole 131. In this way, the connection area between the connecting sheet 140 and the tab 112 increases, and at the same time, the connection area between the connecting sheet 140 and the pole 131 also increases, which is conducive to improving the connection stability of the connecting sheet 140 as a connecting medium for the pole 131 and the tab 112, thereby ensuring the electrical conduction stability of the battery 100 during charging and discharging.

[0052] In the embodiment in which the tab 112 includes the first ear 1121 and the second ear 1122, the second connecting portion 142 can also be connected to the second ear 1122. By arranging in this way, the connection area between the connecting sheet 140 and the tab 112 is further increased.

[0053] It should be noted that the second connecting portion 142 extends along the width direction X, and it should be understood that it extends parallel to the width direction X or has a component in the width direction X. The present application does not limit this.

[0054] In the embodiment in which the connecting tab 140 includes the first connecting portion 141 and the second connecting portion 142, the connecting tab 140 is in a sheet structure when it is produced, i.e., the first connecting portion 141 and the second connecting portion 142 are located in the same plane. When the connecting tab 140 is assembled in the battery 100, in order to enable the cover and the shell 120 to be connected, the second connecting portion 142 needs to be bent. In the embodiment shown in the drawings, the second connecting portion 142 needs to be bent from the plane in which the width direction X and the length direction Y are located to be parallel to the cover plate connecting surface 1111, thereby reducing the space occupied by the second connecting portion 142 in the length direction Y, and further enabling the shell 120 and the cover to be connected. Figure 1 In the embodiment shown in the drawings, the second connecting portion 142 needs to be bent from the plane in which the width direction X and the length direction Y are located to be parallel to the cover plate connecting surface 1111, thereby reducing the space occupied by the second connecting portion 142 in the length direction Y, and further enabling the shell 120 and the cover to be connected.

[0055] It should be noted that the length direction Y and the width direction X shown in the drawings are perpendicular to each other. However, this should be considered as exemplary and not limiting. The length direction Y and the width direction X can be at any angle, as long as they are not parallel. The present application does not limit this.

[0056] In order to facilitate the bending of the connecting tab 140, in some embodiments, the connecting tab 140 is provided as a multi-layer composite structure formed by stacking multiple connecting layers. It is easy to understand that the bending performance of a connecting layer with a small thickness is better. Therefore, by stacking multiple thin connecting layers to form the connecting tab 140, the bending performance of the connecting tab 140 can be improved, thereby avoiding the phenomenon of breakage during bending, and facilitating the improvement of the yield rate during the assembly of the battery 100.

[0057] Alternatively, the thickness of the connecting tab 140 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm. For example, the thickness of the connecting tab 140 can be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm or any value therebetween. An increase in the thickness of the connecting tab 140 will result in an increase in the space occupied and a weakening of the bending performance. On the other hand, if the connecting tab 140 is too thin, it may result in insufficient connection strength and connection stability. The connecting tab 140 within this thickness range can effectively balance the bending performance and the connection strength.

[0058] Further, in general, the material of the connecting tab 140 can be set to be the same as that of the tab 112. For example, the material of the negative tab is usually copper, and therefore the connecting tab 140 connecting the negative tab can also be similarly set as a copper sheet. The material of the positive tab is usually aluminum, and therefore the connecting tab 140 connecting the positive tab can also be similarly set as an aluminum sheet.

[0059] In the embodiment where the connecting tab 140 is a copper tab, the thickness of the connecting tab 140 is greater than or equal to 0.5 mm and less than or equal to 1.0 mm. In the embodiment where the connecting tab 140 is an aluminum tab, the thickness of the connecting tab 140 is greater than or equal to 0.8 mm and less than or equal to 1.5 mm. It can be seen that the thickness of the connecting tab 140 connecting the negative electrode can be set to be less than the thickness of the connecting tab 140 connecting the positive electrode. This is because the electrical conductivity of copper is less than that of aluminum. Therefore, under the same current density, the copper tab can have a thinner thickness. As described above, the current of the negative electrode is usually greater than that of the positive electrode during the charging and discharging process of the battery 100. Therefore, in practice, the thickness of the connecting tab 140 connecting the negative electrode can also be greater than the thickness of the connecting tab 140 connecting the positive electrode according to the requirements. The present application does not limit this.

[0060] It can be easily understood that each of the tabs 112 corresponds to one of the poles 131 one-to-one, and the relationship between the connecting tab 140 and the tab 112 is also one-to-one, thereby avoiding short circuit. For example, the first negative tab 1123a is connected to the first negative pole 131 through a connecting tab 140, the second negative tab 1123b is connected to the second negative pole 131 through a connecting tab 140, the first positive tab 1124a is connected to the first positive pole 131 through a connecting tab 140, and the second positive tab 1124b is connected to the second positive pole 131 through a connecting tab 140.

[0061] The battery 100 of the present application can also be provided with a flexible spacer 150. The flexible spacer 150 is arranged between the cover plate 130 and the pole core 111, and is provided with a hole structure to allow the pole 131 and the tab 112 to be conducted through the hole structure. The arrangement of the flexible spacer 150 can play an insulating role, preventing the tab 112 from contacting the non-pole 131 area of the shell 120 and the cover plate 130 to cause a short circuit phenomenon. At the same time, the flexible spacer 150 can also prevent the positive and negative tabs from being conducted, causing a positive and negative short circuit phenomenon. In the embodiment where the tab 112 includes a first ear portion 1121 and a second ear portion 1122, the second ear portion 1122 passes through the hole structure of the flexible spacer 150, so that the flexible spacer 150 is arranged between the pole core 111 and the second ear portion 1122. In this way, the flexible spacer 150 can maintain the bending shape of the tab 112, while preventing the second ear portion 1122 from contacting the pole core 111 to cause a short circuit.

[0062] In Figure 1In the middle, only the flexible spacer 150 is shown on the side of the second cover 130b. This is because in the assembly process of the battery 100, the first cover 130a can be first welded to the battery cell 110, and then the first cover 130a is connected to the shell 120. Then the second cover 130b is connected to the shell 120. Since the first cover 130a is first connected to the battery cell 110, the first cover 130a can be provided with an insulating member without worrying about the difficulty of connecting the first cover 130a to the shell 120. The second cover 130b is connected to the shell 120 later than the first cover 130a, so the second cover 130b has a size limit to avoid the problem of difficulty in connecting to the shell 120. Therefore, the side of the second cover 130b is provided with a flexible spacer 150 instead of an insulating member on the second cover 130b, so that the flexible spacer 150 can be compressed during the connection of the second cover 130b and the shell 120, thereby allowing the second cover 130b and the shell 120 to be connected. However, this should be exemplary and not limiting. The battery 100 can have flexible spacers 150 provided on both sides of the cover plate connection surface 1111, or the first cover 130a side can be provided with a flexible spacer 150 and the second cover 130b side can not be provided. The present application does not limit this.

[0063] Based on the above various embodiments, the present application also provides a battery pack comprising the battery 100 as described above. The battery pack provided with the battery 100 of the present application has a longer service life because the temperature rise of the tab 112 during charging and discharging of the battery 100 can be effectively reduced, and the fast charging capability and safety performance of the battery pack can also be effectively guaranteed.

[0064] The present application also provides a vehicle comprising the battery pack as described above. The vehicle provided with the battery pack of the present application has a longer service life because the temperature rise of the tab 112 during charging and discharging of the battery 100 can be effectively reduced, which is beneficial to reduce the frequency of replacing and maintaining the battery by the user of the vehicle, and improve the use experience of the user of the vehicle. At the same time, the fast charging capability and safety performance of the vehicle can be effectively guaranteed to ensure the safety during driving of the vehicle.

[0065] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structure described in the above embodiments and shown in the drawings; any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery cell, characterized in that, include: The pole core (111) includes a cover plate connecting surface (1111) and a side surface (1112) adjacent to the cover plate connecting surface (1111) in the width direction (X); the pole core (111) also includes a recess (1113) recessed from the cover plate connecting surface (1111) and the side surface (1112) toward the interior of the pole core (111); and, A tab (112) is disposed in the recess (1113) and connected to the pole core (111); Wherein, the size of the tab (112) in the width direction (X) is less than or equal to the depth of the recess (1113) in the width direction (X).

2. The battery cell according to claim 1, characterized in that, The electrode ear (112) includes a first ear portion (1121) and a second ear portion (1122); the extension direction of the first ear portion (1121) is different from the extension direction of the second ear portion (1122); the first ear portion (1121) is disposed in the recessed portion (1113); the second ear portion (1122) is disposed on the cover plate connecting surface (1111) and extends along the width direction (X).

3. The battery cell according to claim 2, characterized in that, The first ear portion (1121) has a first width (D1) in the width direction (X); the second ear portion (1122) has a second width (D2) in the width direction (X); and the pole core (111) has a third width (D3) in the width direction (X). The sum of the first width (D1) and the second width (D2) is greater than half of the third width (D3).

4. The battery cell according to any one of claims 1-3, characterized in that, The cover plate connecting surface (1111) includes two and is arranged opposite to each other; the side surface (1112) includes two and is arranged opposite to each other; a recess (1113) is provided at the connection position of each of the cover plate connecting surface (1111) and the side surface (1112); a tab (112) is provided in each recess (1113).

5. A battery, characterized in that, The device includes a housing (120), a cover plate (130), and a battery cell (110) as described in any one of claims 1-4; the battery cell (110) is disposed in an accommodating space inside the housing (120); the cover plate (130) is connected to the housing at the cover plate connecting surface (1111) and includes a terminal post (131); the terminal post (131) is connected to the tab (112).

6. The battery according to claim 5, characterized in that, The battery (100) also includes: A connecting piece (140) is connected to the tab (112) and the pole post (131); the connecting piece (140) covers the tab (112).

7. The battery according to claim 6, characterized in that, The connecting piece (140) includes a first connecting portion (141) and a second connecting portion (142); the extension direction of the first connecting portion (141) is different from the extension direction of the second connecting portion (142); the first connecting portion (141) is disposed in the recess (1113) and connected to the electrode tab (112); the second connecting portion (142) is disposed between the battery cell (110) and the cover plate (130), and extends into the battery cell (111) along the width direction (X); the second connecting portion (142) is connected to the electrode post (131).

8. The battery according to claim 7, characterized in that, The connecting piece (140) is configured as a multi-layer composite structure formed by stacking multiple connecting layers; and / or, The thickness of the connecting piece (140) is greater than or equal to 0.5 mm and less than or equal to 1.5 mm.

9. The battery according to claim 5, characterized in that, The cover plate (130) includes a first cover body (130a) and a second cover body (130b); the cover plate connecting surface (1111) includes a first connecting surface (1111a) and a second connecting surface (1111b) disposed opposite to each other; the first cover body (130a) is connected to the housing (120) on one side of the first connecting surface (1111a); the second cover body (130b) is connected to the housing (120) on one side of the second connecting surface (1111b); The first cover (130a) is provided with a liquid injection hole; the second cover (130b) is provided with an explosion-proof valve; wherein, The electrode tab (112) includes a first negative electrode tab (1123a) disposed on one side of the first connecting surface (1111a) and a second negative electrode tab (1123b) disposed on one side of the second connecting surface (1111b); the dimension (W1) of the first negative electrode tab (1123a) in the width direction (X) is greater than the dimension (W2) of the second negative electrode tab (1123b) in the width direction (X).

10. A battery pack, characterized in that, Includes the battery (100) as described in any one of claims 5-9.

11. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 10.

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