Battery cell and battery

Abstract

The utility model provides a battery cell and a battery, and the battery cell comprises at least two electrode assemblies which are arranged in a stacked manner, and each electrode assembly is provided with a battery cell end face; the battery cell further comprises a tab assembly and a first connecting piece; the tab assembly is arranged on at least one battery cell end surface of each electrode assembly; the first connecting piece is configured to enable the tab assemblies with the same polarity in the at least two electrode assemblies to be mutually connected and to be connected to the battery core end surfaces of the electrode assemblies. The battery cell and the battery provided by the utility model are used for solving the technical problem that the welding effect is influenced due to the fact that the tabs are easy to warp.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and a battery. Background Art

[0002] As a common energy storage device, batteries are widely used in fields such as power tools, automobiles, drones, and intelligent terminal devices. In recent years, many lithium-ion production enterprises have been committed to researching battery manufacturing technologies to improve the performance of batteries.

[0003] In related technologies, during the production process of batteries, the tabs connected to the battery cells are bound together through a tab flattening process. The tab flattening process is to press down the originally upright tabs so that the tabs come into contact with each other to achieve a better current collection effect. For non-flattened tabs, the tabs are not fixed and are prone to warping, which affects subsequent welding and easily causes problems such as poor welding.

[0004] Therefore, it is urgent to solve the technical problem that the tabs are prone to warping and affecting the welding effect. Summary of the Utility Model

[0005] The utility model provides a battery cell and a battery to solve the technical problem that the tabs are prone to warping and affecting the welding effect.

[0006] To achieve the above object, the utility model provides a battery cell, including:

[0007] At least two electrode assemblies stacked, and the electrode assemblies have cell end faces;

[0008] A tab assembly, and the tab assembly is arranged on at least one of the cell end faces of each of the electrode assemblies;

[0009] A first connecting member, and the first connecting member is configured to connect the tab assemblies with the same polarity in at least two of the electrode assemblies to each other and connect to the cell end faces of the electrode assemblies.

[0010] For the battery cell provided by the utility model, by setting the first connecting member, the tab assemblies with the same polarity in at least two electrode assemblies are connected to each other and connected to the cell end faces of the electrode assemblies, realizing the fixation of the tab assemblies with the same polarity, which can avoid the problems of warping or angle change of the tab assemblies, reduce the phenomena of virtual soldering or solder penetration caused by the displacement of the tab assemblies, and contribute to improving the welding accuracy and welding stability between the tab assemblies and the adapter.

[0011] In a possible implementation manner, at least two of the electrode assemblies include;

[0012] A first electrode assembly; and

[0013] The second electrode assembly, the second electrode assembly and the first electrode assembly are stacked along a first direction, the extending direction of each of the tab assemblies of the first electrode assembly faces the second electrode assembly along the first direction, and the extending direction of each of the tab assemblies of the second electrode assembly faces the first electrode assembly along the first direction.

[0014] In a possible implementation manner, the first connecting member includes a first section, the first section is disposed on a surface of the tab assembly facing away from the electrode assembly, and two ends of the first section extend out of the tab assembly along the first direction and are connected to the end face of the battery cell of the electrode assembly.

[0015] In a possible implementation manner, the tab assembly includes a plurality of tabs, and the tabs with the same polarity are stacked on the end face of the battery cell of the electrode assembly.

[0016] In a possible implementation manner, the first connecting member further includes a second section and a third section, the second section and the third section are respectively connected to opposite ends of the first section, and the second section and the third section are respectively disposed on outer wall surfaces of the first electrode assembly and the second electrode assembly facing away from each other.

[0017] In a possible implementation manner, each of the tab assemblies has an exposed area exposed from the first connecting member and a hidden area covered by the first connecting member, and the exposed area is located between the two hidden areas.

[0018] In a possible implementation manner, the battery cell further includes at least one second connecting member, and at least two of the electrode assemblies are connected by the second connecting member.

[0019] In a possible implementation manner, the second connecting member includes a fourth section, a fifth section and a sixth section connected in sequence, the fourth section abuts against the outer wall surfaces of the at least two electrode assemblies, and the fifth section and the sixth section are respectively connected to the outer wall surfaces of the at least two electrode assemblies facing away from each other.

[0020] In a possible implementation manner, there are a plurality of the second connecting members, and the plurality of second connecting members are respectively located on different sides of the at least two electrode assemblies.

[0021] The present utility model further includes a battery, including a housing and the above-mentioned battery cell, and the battery cell is disposed in the housing.

[0022] A cell and a battery provided by the present utility model can prevent the problem of warping of the tab assemblies by providing a first connecting member, which connects the tab assemblies with the same polarity in two electrode assemblies to the end face of the cell of the electrode assembly, helps to realize the welding connection of the bent tab assemblies, can improve the welding precision, prevent problems such as false soldering and lack of soldering caused by the displacement of the tab assemblies, and improve the welding stability.

[0023] In addition to the technical problems solved by the embodiments of the present utility model described above, the technical features constituting the technical solutions, and the beneficial effects brought by the technical features of these technical solutions, other technical problems that can be solved by the cell and the battery provided by the embodiments of the present utility model, other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manners. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 A three-dimensional structure diagram of the cell provided by the embodiment of the present utility model;

[0026] Figure 2 A top view of the cell provided by the embodiment of the present utility model;

[0027] Figure 3 A cross-sectional view of the cell provided by the embodiment of the present utility model;

[0028] Figure 4 A structure diagram of the electrode sheet of the cell provided by the embodiment of the present utility model;

[0029] Figure 5 A front view of the cell provided by the embodiment of the present utility model;

[0030] Figure 6 A three-dimensional structure diagram of the welding adapter on the cell provided by the embodiment of the present utility model;

[0031] Figure 7 For Figure 6 The top view of.

[0032] Description of the reference numerals:

[0033] 10 - Electrode assembly;

[0034] 11 - Electrode tab;

[0035] 12 - First electrode assembly;

[0036] 13 - Second electrode assembly;

[0037] 20 - Tab assembly;

[0038] 21 - Tab;

[0039] 211 - Connection segment;

[0040] 212 - Extension segment;

[0041] 23 - Exposed area;

[0042] 30 - First connecting piece;

[0043] 31 - First segment;

[0044] 32 - Second segment;

[0045] 33 - Third segment;

[0046] 40 - Second connecting piece;

[0047] 41 - Fourth segment;

[0048] 42 - Fifth segment;

[0049] 43 - Sixth segment;

[0050] 50 - Adapter. Detailed implementation manners

[0051] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0052] In order to achieve the electrical connection between the battery cell and the cover plate, in the related art, during the production process of the battery, first, the tab connected to the battery cell is welded to the adapter, and then the tab is bent so that the tab is roughly laid flat between the battery cell and the cover plate. In this way, a certain space needs to be reserved between the battery cell and the cover plate, which affects the energy density of the battery. In this application, a scheme of first bending the tab and then welding the tab to the adapter is adopted, and there is no need to reserve a certain space between the battery cell and the cover plate, which can improve the energy density of the battery.

[0053] The originally upright tab is bent into a bent tab, but the bent tab is difficult to be stably fixed and is prone to displacement, such as a change in the bending angle or warping of the edge, which affects the low welding accuracy and is likely to cause problems of poor welding.

[0054] In view of this, the battery cell and battery provided by the present utility model, by providing a first connecting member, enable the tab assemblies with the same polarity in two electrode assemblies to be connected to each other and connected to the end face of the battery cell of the electrode assembly, realizing the fixation of the tab assemblies with the same polarity, and can avoid problems such as a change in the bending angle or warping of the tab assemblies, reducing the phenomena of virtual soldering or soldering through caused by the displacement of the tab assemblies, and helping to improve the welding accuracy and welding stability of the tab assemblies and the cover plate.

[0055] The battery cell and battery provided by the embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0056] Refer to Figure 1 、 Figure 2 and Figure 3 As shown, the present utility model provides a battery cell, including: at least two electrode assemblies 10 stacked, and the electrode assembly 10 has an end face of the battery cell; the battery cell further includes a tab assembly 20 and a first connecting member 30, and the tab assembly 20 is arranged on at least one end face of each electrode assembly 10; the first connecting member 30 is configured to enable the tab assemblies 20 with the same polarity in at least two electrode assemblies 10 to be connected to each other and connected to the end face of the battery cell of the electrode assembly 10.

[0057] For the battery cell provided by the present utility model, by providing the first connecting member 30, the tab assemblies 20 with the same polarity in two electrode assemblies 10 are connected to each other and commonly connected to the end face of the battery cell of the electrode assembly 10, realizing the fixation of the tab assemblies 20 with the same polarity, and can avoid problems such as warping or angle change of the tab assemblies 20, reducing the phenomena of virtual soldering or soldering through caused by the displacement of the tab assemblies 20, and helping to improve the welding accuracy and welding stability of the tab assemblies 20 and the adapter 50.

[0058] In a possible implementation manner, the first connecting member 30 may be a flexible insulating sheet coated with a colloid.

[0059] In a possible implementation manner, each electrode assembly 10 includes a plurality of electrode plates 11, and the plurality of electrode plates 11 are stacked or stacked and wound, and the tab assembly 20 is connected to the plurality of electrode plates 11.

[0060] In a possible implementation, the multiple pole pieces 11 include a first pole piece and a second pole piece. One of the first pole piece and the second pole piece is a positive pole piece, and the other is a negative pole piece. The first pole piece and the second pole piece are separated by a separator. The separator is a flexible film material, which can prevent the first pole piece and the second pole piece from contacting and causing a short - circuit problem, and can also allow the ions in the electrolyte to pass through.

[0061] Among them, the pole piece 11 is an electrode unit formed in a thin - sheet shape inside the battery.

[0062] In a possible implementation, referring to Figure 1 as shown, the top surface of the electrode assembly 10 is the end face of the battery cell. The two pole ear assemblies 20 provided on the end face of the battery cell of each electrode assembly 10 are a positive pole ear assembly and a negative pole ear assembly respectively. Among them, the positive pole ear assembly is connected to the positive pole piece, and the negative pole ear assembly is connected to the negative pole piece.

[0063] In other possible implementations, referring to Figure 1 as shown, both the top surface and the bottom surface of the electrode assembly 10 are the end faces of the battery cell. Among them, the positive pole ear assembly can be the end face of the battery cell at the top of the electrode assembly 10, and the negative pole ear assembly can be the end face of the battery cell at the bottom of the electrode assembly 10; or, the positive pole ear assembly can be the end face of the battery cell at the bottom of the electrode assembly 10, and the negative pole ear assembly can be the end face of the battery cell at the top of the electrode assembly 10.

[0064] In a possible implementation, referring to Figure 1 and Figure 3 as shown, at least two electrode assemblies 10 include a first electrode assembly 12 and a second electrode assembly 13 stacked along a first direction. The extending direction of each pole ear assembly 20 of the first electrode assembly 12 is along the first direction towards the second electrode assembly 13, and the extending direction of each pole ear assembly 20 of the second electrode assembly 13 is along the first direction towards the first electrode assembly 12. That is, the extending directions of each pole ear assembly 20 of the first electrode assembly 12 and each pole ear assembly 20 of the second electrode assembly 13 extend towards the mutually facing directions.

[0065] In other possible implementations, the extending directions of each pole ear assembly 20 of the first electrode assembly 12 and each pole ear assembly 20 of the second electrode assembly 13 can also be the same.

[0066] In this example, the first direction is the stacking direction of the electrode assembly 10, referring to the direction indicated by the arrow Y in Figure 2 as shown.

[0067] The polarities of the positive electrode tab assemblies in the tab assembly 20 are the same, and the polarities of the negative electrode tab assemblies in the tab assembly 20 are the same; however, the polarity of the positive electrode tab assembly is different from that of the negative electrode tab assembly. The first connecting member 30 is configured to connect the tab assemblies 20 with the same polarity in the two electrode assemblies 10, that is, the first connecting member 30 connects the positive electrode tab assembly in the first electrode assembly 12 and the positive electrode tab assembly in the second electrode assembly 13, and the first connecting member 30 connects the negative electrode tab assembly in the first electrode assembly 12 and the negative electrode tab assembly in the second electrode assembly 13.

[0068] In a possible implementation manner, referring to Figure 1 and Figure 2 shown, the first connecting member 30 can also be insulating adhesive tape, which has good adhesiveness and insulation. The first connecting member 30 includes a first section 31, and the first section 31 is disposed on the side of the tab assembly 20 facing away from the electrode assembly 10, and both ends of the first section 31 extend out of the tab assembly 20 along the first direction and are connected to the end face of the battery cell of the electrode assembly 10.

[0069] Referring to Figure 1 and Figure 2 shown, the first connecting member 30 can be strip-shaped, and the length direction of the first section 31 is also along the first direction. The first section 31 is pressed on the tab assembly 20 to fix the tab assembly 20, reducing the occurrence of loosening and displacement of the tab assembly 20, enhancing the welding accuracy and welding stability of the tab assembly 20, and realizing the connection of the tab assembly 20 to the end face of the battery cell of the electrode assembly 10.

[0070] In a possible implementation manner, the tab assembly 20 includes a plurality of tabs 21, and the tabs 21 with the same polarity are stacked on the end face of the battery cell of the electrode assembly 10.

[0071] In a possible implementation manner, referring to Figure 3 and Figure 4 shown, the tab assembly 20 includes a plurality of tabs 21, and the tab 21 includes a connecting section 211 and an extending section 212 that are connected to each other. The connecting section 211 is connected to the electrode tab 11, and the extending section 212 extends out of the outside of the electrode tab 11; the extending sections 212 with the same polarity are stacked on the end face of the battery cell of the electrode assembly 10, and the connecting section 211 is used to realize the connection between the tab 21 and the electrode tab 11.

[0072] In a possible implementation manner, when the tab assembly 20 is a positive electrode tab assembly, the tab 21 is a positive electrode tab connected to the positive electrode tab, and the positive electrode tab can be aluminum foil. When the tab assembly 20 is a negative electrode tab assembly, the tab 21 is a negative electrode tab connected to the negative electrode tab, and the negative electrode tab can be copper foil.

[0073] In a possible implementation manner, refer to Figure 1 and Figure 2 As shown, the first section 31 extends along the first direction. The first connecting member 30 further includes a second section 32 and a third section 33. The second section 32 and the third section 33 are respectively connected to opposite ends of the first section 31, and the second section 32 and the third section 33 are respectively disposed on the outer wall surfaces of the first electrode assembly 12 and the second electrode assembly 13 that face away from each other.

[0074] If we want to ensure that the first connecting member 30 has sufficient adhesion, in addition to improving the adhesion of the first connecting member 30, we can also increase the adhesion area. By providing the second section 32 and the third section 33 in this application, the connection area between the first connecting member 30 and the electrode assembly 10 can be increased, thereby improving the connection strength of the first connecting member 30 and making it difficult for the first section 31 to separate from the end face of the battery cell of the electrode assembly 10.

[0075] In a possible implementation manner, refer to Figure 3 As shown, the first section 31, the second section 32 and the third section 33 are an integrally connected overall structure.

[0076] In a possible implementation manner, refer to Figure 2 As shown, the tab assembly 20 all has an exposed area 23 exposed outside the first connecting member 30 and a hidden area covered by the first connecting member 30. The exposed area 23 is located between two hidden areas. Such a structure can effectively prevent the problem of warping of the tab assembly 20 compared to the structure where the first connecting member 30 only covers one end of the tab assembly 20 in the width direction, thereby improving the stability of the tab assembly 20 fixed on the end face of the battery cell of the electrode assembly 10.

[0077] The width direction of the tab assembly 20 refers to Figure 2 the direction indicated by the arrow X in

[0078] The hidden area is covered by the first connecting member 30 to realize the connection of multiple tabs 21. The exposed area 23 is used to realize the welding of the tab assembly 20. By reserving the exposed area 23, it is prevented that the setting of the first connecting member 30 affects the welding operation and ensures the smooth progress of the welding operation.

[0079] It is easy to understand that, along the direction perpendicular to the end face of the battery cell of the electrode assembly 10 and projected, the exposed area 23 is the area where the projections of the tab assembly 20 and the first connecting member 30 do not overlap, and the hidden area is the area where the projections of the tab assembly 20 and the first connecting member 30 overlap.

[0080] In a possible implementation manner, the number of the first connecting members 30 can be four. The two ends in the width direction of the positive electrode tab assembly are respectively covered by two first connecting members 30. In addition, the two ends in the width direction of the negative electrode tab assembly are also respectively covered by two first connecting members 30. With such a structure, there is no need for the area between the positive electrode tab assembly and the negative electrode tab assembly to be covered by the first connecting members 30, which can save the consumption of the first connecting members 30.

[0081] In other possible implementation manners, the number of the first connecting members 30 can be three. One of the first connecting members 30 is located between the positive electrode tab assembly and the negative electrode tab assembly, and the two ends in the width direction of this first connecting member 30 respectively cover the positive electrode tab assembly and the negative electrode tab assembly. The other two first connecting members 30 are respectively arranged oppositely at the other end in the width direction of the positive electrode tab assembly and the other end in the width direction of the negative electrode tab assembly. With such a structure, during the production process of the battery cell, the first connecting member 3 can be pasted one less time, simplifying the process of arranging the first connecting members 30 and improving the production efficiency of the battery.

[0082] In a possible implementation manner, referring to Figure 1 and Figure 5 as shown, the battery cell further includes at least one second connecting member 40, and at least two electrode assemblies 10 are connected by the second connecting member 40.

[0083] In a possible implementation manner, the second connecting member 40 can be, for example, a thermal conductive adhesive, and the second connecting member 40 is connected between two adjacent electrode assemblies 10.

[0084] In a possible implementation manner, the second connecting member 40 can be, for example, an insulating adhesive tape. The second connecting member 40 can be located at the three side edges of the electrode assembly 10. For example, along the width direction of the tab assembly 20, two second connecting members 40 are respectively located at the two opposite side edges of the electrode assembly 10, and one side edge of the electrode assembly 10 relative to the end face of the battery cell, so as to realize the stable connection of at least two electrode assemblies 10, which helps to improve the stability of the connection of the first connecting members 30.

[0085] In a possible implementation manner, the second connecting member 40 is arranged at the edges of two electrode assemblies 10, thus realizing the fixation of the two electrode assemblies 10 and improving the stability of the fixation of the first connecting members 30. The number of the second connecting members 40 arranged at each side edge of the electrode assembly 10 can be one, two, or more, and no specific limitation is made here.

[0086] In a possible implementation manner, referring to Figure 1 and Figure 6As shown, the second connecting member 40 includes a fourth section 41, a fifth section 42, and a sixth section 43 that are connected in sequence. The fourth section 41 abuts against the outer wall surfaces of at least two electrode assemblies 10, and the fifth section 42 and the sixth section 43 are respectively connected to the mutually facing outer wall surfaces of at least two electrode assemblies 10. This increases the contact area between the second connecting member 40 and at least two electrode assemblies 10 stacked, thereby improving the stability of the second connecting member 40 pair.

[0087] In a possible implementation manner, the fourth section 41, the fifth section 42, and the sixth section 43 can be an integrally connected overall structure, and the thickness of the second connecting member 40 remains uniform.

[0088] In other possible implementation manners, the number of electrode assemblies 10 stacked can also be 4, etc. The ear components 20 with the same polarity in the 4 electrode assemblies 10 are connected by the first connecting member 30, and the ear components 20 are pasted and fixed on the end face of the battery cell of the electrode assembly 10. And by connecting the 4 electrode assemblies 10 into a whole through a plurality of second connecting members 40, the consumption of the first connecting member 30 and the second connecting member 40 can be saved, and the pasting process of the first connecting member 30 and the second connecting member 40 can be simplified, which helps to improve production efficiency.

[0089] The present invention also provides a battery, including a housing and the above-mentioned battery cell, and the battery cell is arranged inside the housing.

[0090] Reference Figure 6 and Figure 7 As shown, a transfer member 50 is welded to the exposed area 23 of the ear component 20 of the battery cell. The transfer member 50 is used to collect the generated current, extract electrical energy from the battery, and send power outwards connected to the ear component 20. The transfer member 50 can be a transfer sheet. Among them, the transfer member 50 welded on the positive ear component is the positive transfer member, and the transfer member 50 welded on the negative ear component is the negative transfer member.

[0091] In a possible implementation manner, the housing includes a housing body and a cover plate assembly. The housing body has an accommodation cavity for accommodating the battery cell inside, and an electrolyte is injected into the accommodation cavity to immerse the battery cell in the electrolyte. The cover plate assembly covers the open end at the top of the housing body. The housing body can be used as the negative output terminal, and the housing body is electrically connected to the negative ear component in the ear component 20 through the negative transfer member. The cover plate assembly is used as the positive electrode output terminal, and the whole machine ear component in the ear component 20 faces the cover plate assembly, which is convenient for the cover plate assembly to be electrically connected to the positive ear component in the ear component 20 through the positive transfer member.

[0092] A battery provided by the present invention can be a square shell battery, and its housing is generally rectangular.

[0093] A cell and a battery provided by the present utility model, by providing a first connecting member 30, enables the ear components 20 with the same polarity in two electrode components 10 to be connected to each other and connected to the end face of the cell of the electrode component 10, which can prevent the ear components 20 from curling up, contribute to the welding connection of the bent ear components 20, improve the welding accuracy, and improve the welding effect.

[0094] For the cell and the battery provided by the present utility model, during the battery production process, the ears are first bent so that the ears change from the upright state to the bent state. Since the bent ears are prone to displacement, the present application pre-fixes the bent ear components 20 through the first connecting member 30, which can prevent the ear components 20 from curling up, improve the accuracy of welding the ear components to the adapter 50 subsequently, prevent problems such as false soldering and lack of soldering caused by the displacement of the ear components 20, and improve the welding stability.

[0095] The present application adopts the scheme of first bending the ears and then welding the ears, without the need to reserve a certain space between the cell and the cover plate, which can improve the energy density of the battery.

[0096] In the description of the present utility model, it should be understood that the terms "center", "length", "width", "thickness", "top end", "bottom end", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated position or component must have a specific orientation, be constructed and operated in a specific manner, and thus should not be construed as a limitation to the present utility model.

[0097] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0098] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or may communicate with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0099] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A battery cell, characterized in that: include: At least two electrode assemblies (10) are stacked and arranged, wherein the electrode assembly (10) has a cell end face; A tab assembly (20), the tab assembly (20) being arranged on at least one of the battery cell end faces of each of the electrode assemblies (10); A first connecting member (30), wherein the first connecting member (30) is configured to interconnect the tab assemblies (20) of the same polarity in at least two of the electrode assemblies (10), and is connected to the cell end face of the electrode assembly (10).

2. The battery cell according to claim 1, characterized in that: At least two of the electrode assemblies (10) include: A first electrode assembly (12); as well as A second electrode assembly (13), wherein the second electrode assembly (13) and the first electrode assembly (12) are stacked along a first direction, wherein the extension direction of each of the pole lug assemblies (20) of the first electrode assembly (12) is toward the second electrode assembly (13) along the first direction, and the extension direction of each of the pole lug assemblies (20) of the second electrode assembly (13) is toward the first electrode assembly (12) along the first direction.

3. The battery cell according to claim 2, characterized in that: The first connecting member (30) comprises a first section (31), the first section (31) being arranged on a side of the pole tab assembly (20) facing away from the electrode assembly (10), and two ends of the first section (31) extending out of the pole tab assembly (20) along the first direction and connected to the cell end face of the electrode assembly (10).

4. The battery cell according to claim 1, characterized in that: The electrode tab assembly (20) comprises a plurality of electrode tabs (21), and the electrode tabs (21) with the same polarity are stacked and arranged on the end surface of the battery cell of the electrode assembly (10).

5. The battery cell according to claim 3, characterized in that: The first connecting member (30) further comprises a second section (32) and a third section (33), wherein the second section (32) and the third section (33) are respectively connected to opposite ends of the first section (31), and the second section (32) and the third section (33) are respectively arranged on mutually opposite outer wall surfaces of the first electrode assembly (12) and the second electrode assembly (13).

6. The battery cell according to claim 1, characterized in that: The tab assembly (20) has an exposed area (23) exposed to the first connecting member (30), and a hidden area covered by the first connecting member (30), wherein the exposed area (23) is located between the two hidden areas.

7. The battery cell according to any one of claims 1 to 6, characterized in that: It also includes at least one second connecting member (40), and at least two electrode assemblies (10) are connected via the second connecting member (40).

8. The battery cell according to claim 7, characterized in that: The second connecting member (40) comprises a fourth section (41), a fifth section (42) and a sixth section (43) which are connected in sequence, the fourth section (41) abutting against the outer wall surfaces of the at least two electrode assemblies (10), and the fifth section (42) and the sixth section (43) are respectively connected to the outer wall surfaces of the at least two electrode assemblies (10) which are away from each other.

9. The battery cell according to claim 7, characterized in that: There are a plurality of the second connecting members (40), and the plurality of the second connecting members (40) are respectively located on different sides of the at least two electrode assemblies (10).

10. A battery, characterized in that: The invention comprises a shell and the battery core according to any one of claims 1 to 9, wherein the battery core is arranged in the shell.

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