Battery cell and battery pack

Abstract

The utility model discloses a battery monomer and a battery pack, and relates to the technical field of batteries. The battery monomer comprises a shell, an end cover, a battery cell assembly, a tab and an elastic supporting piece, the battery cell assembly is arranged in the shell, a gap is formed between the battery cell assembly and the shell in the second direction of the single battery, and the tab is connected with the battery cell assembly and extends to the end cover in the first direction; and the elastic supporting piece is arranged in the gap, the elastic supporting piece comprises first supporting parts and second supporting parts which are connected, and the multiple first supporting parts and the multiple second supporting parts are alternately connected in the first direction to form an S-shaped or sawtooth-shaped structure. The elastic supporting piece is used for filling the gap between the long edge of the battery cell assembly and the inner surface of the shell, so that the risks that the tab is torn and the edge of the battery cell assembly is broken or broken are avoided, it is ensured that lithium ions can be smoothly embedded into the lithium ion battery in the charging process, the lithium precipitation phenomenon is avoided, and the service life of the lithium ion battery is prolonged. The performance and the cycle life of the battery are improved.

Description

Technical Field

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

[0002] The battery cell includes a shell and a cell assembly. The cell assembly is arranged in the shell. The cell assembly includes a main body and a tab portion connected to the main body. There is a certain gap between the cell assembly and the inner surface of the shell to facilitate the assembly of the cell assembly into the shell. However, the existence of the gap will cause the cell assembly to shake inside the shell. Therefore, during transportation and use, the cell assembly will be pulled by gravity, causing the tab to tear, and the edges of the cell assembly are prone to breakage or shattering. This not only destroys the integrity of the cell assembly, but also affects the normal transmission and embedding of lithium ions, resulting in lithium plating. Utility Model Content

[0003] The purpose of this application is to provide a battery cell and a battery pack to solve the technical problem that during the transportation and use of the battery cell, the tabs may be easily torn, the pole pieces may be broken or shattered due to the gap between the battery cell assembly and the inner surface of the shell.

[0004] In the first aspect, the present application provides a battery cell, comprising: a shell having an opening; an end cover, arranged on the shell and used to close the opening; a cell assembly, arranged in the shell, and a gap is provided between the cell assembly and the shell in the second direction of the battery cell, wherein the first direction of the battery cell is the connection direction between the shell and the end cover, and the second direction is a direction perpendicular to the first direction on the large surface of the cell assembly; a tab, connected to the cell assembly and extending along the first direction to the end cover; and an elastic support member, arranged in the gap, the elastic support member including a first support portion and a second support portion connected to each other, the first support portion and the second support portion being alternately connected in the first direction to form an S-shaped or zigzag structure.

[0005] In some embodiments, the elastic support member includes a first support segment, a second support segment, and a third support segment connected to each other. The first support segment and the second support segment are connected to form a first support portion, and the second support segment and the third support segment are connected to form a second support portion.

[0006] In some embodiments, the first support segment is set at a first angle to the surface of the shell, the second support segment is set at a second angle to the surface of the battery cell assembly, and the third support segment is set at a third angle to the surface of the battery cell assembly; wherein the angle of the first angle is equal to the angle of the third angle.

[0007] In some embodiments, the first support portion has a first support surface and a second support surface in the second direction, the first support surface abuts the surface of the battery cell assembly, and a first gap is provided between the second support surface and the surface of the shell; the second support portion has a third support surface and a fourth support surface in the second direction, the third support surface abuts the surface of the shell, and a second gap is provided between the fourth support surface and the surface of the battery cell assembly.

[0008] In some embodiments, the shell has an inner bottom surface in the second direction, and the battery cell assembly has a first surface in the second direction; the gap includes a first gap, the elastic support member includes a first elastic support member, a first gap is provided between the inner bottom surface and the first surface, and the first elastic support member is arranged in the first gap.

[0009] In some embodiments, the shell has an inner top surface opposite to the inner bottom surface in the second direction, and the battery cell assembly has a second surface opposite to the first surface in the second direction; the gap also includes a second gap, the elastic support member also includes a second elastic support member, a second gap is provided between the inner top surface and the second surface, and the second elastic support member is arranged in the second gap.

[0010] In some embodiments, the battery cell assembly includes a main body and a tab portion, the tab portion is connected to the main body in a first direction, and the orthographic projection length of the main body in a second direction is the same as the orthographic projection length of the elastic support member in the second direction.

[0011] In some embodiments, the main body includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet are stacked, and the separator is arranged between the positive electrode sheet and the negative electrode sheet.

[0012] In some embodiments, the compression amount of the elastic support member is greater than or equal to the size of the gap in the second direction.

[0013] In a second aspect, the present application provides a battery pack, comprising a box body; and the above-mentioned battery cells, wherein the battery cells are disposed in the box body.

[0014] The technical effect of the present invention is to provide a battery cell and battery pack that fills the gap between the long side of the battery cell assembly and the inner surface of the shell with an elastic support member, thereby reducing the risk of tab tearing and battery cell assembly edge fracture or breakage, ensuring that lithium ions can be smoothly embedded in the lithium-ion battery during charging, avoiding the occurrence of lithium plating, and thereby improving the performance and cycle life of the battery. The embodiment of the present application uses an elastic support member with a concave-convex structure, which can avoid the problem of thick elastic support members being unable to enter the shell, and can also reduce the weight of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0016] Figure 1 Structure diagram of battery cell provided for the embodiment of the present application Figure One .

[0017] Figure 2 Structure diagram of shell and side end cover provided for the embodiment of the present application

[0018] Figure 3 Structure diagram of battery cell provided for the embodiment of the present application

[0019] Figure 4 Structure diagram of battery cell provided for the embodiment of the present application

[0020] Figure 5 Structure diagram of battery cell provided for the embodiment of the present application Figure Two .

[0021] Figure 6 Structure diagram of battery cell provided for the embodiment of the present application Figure Three .

[0022] Figure 7 Top view of the elastic support provided on the battery cell assembly provided for the embodiment of the present application Figure One , mainly showing that the elastic support is S-shaped structure.

[0023] Figure 8 Top view of the elastic support provided on the battery cell assembly provided for the embodiment of the present application Figure Two , mainly showing that the elastic support is sawtooth-shaped structure.

[0024] Figure 9 Structure diagram of battery cell provided for the embodiment of the present application Figure Three .

[0025] The components in the drawings are identified as follows:

[0026] 1 shell; 11 opening; 111 inner bottom surface; 112 inner top surface;

[0027] 2 end cover; 21 first end cover; 22 second end cover;

[0028] 3 battery cell assembly; 31 first surface; 32 second surface; 311 body part; 301 positive plate; 302 negative plate; 303 separator; 331 first curved part; 332 second curved part;

[0029] 4 tab; 41 positive tab; 42 negative tab;

[0030] 5 elastic support member; 51 first elastic support member; 52 second elastic support member; 511 first support portion; 512 second support portion; 521 first support section; 522 second support section; 523 third support section; 531 first support surface; 532 second support surface; 533 third support surface; 534 fourth support surface; 541 first gap; 542 second gap;

[0031] 10 gap; 101 first gap; 102 second gap. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0037] When the battery cell assembly is installed in the casing, there is a certain gap between the battery cell assembly and the inner surface of the casing, which will cause the battery cell assembly to shake inside the casing. Therefore, during transportation and use, the battery cell assembly will be pulled by gravity, causing the tabs to tear, and the edges of the battery cell assembly to break or shatter, which will lead to the risk of lithium deposition during the battery cell cycle and poor cycle performance of the battery cell.

[0038] To solve the above technical problems, an embodiment of the present application provides a battery cell, comprising a shell, an end cap, a cell assembly, a tab, and an elastic support member. The shell has an opening; the end cap is disposed on the shell to close the opening; the cell assembly is disposed in the shell, and a gap is formed between the cell assembly and the shell in the second direction of the battery cell, wherein the first direction of the battery cell is the connection direction between the shell and the end cap, and the second direction of the battery cell is a direction perpendicular to the first direction on the large surface of the cell assembly; the tab is connected to the cell assembly and extends to the end cap along the first direction; and the elastic support member is disposed in the gap, and the elastic support member includes a first support portion and a second support portion connected to each other, and a plurality of first support portions and a plurality of second support portions are alternately connected in the first direction to form an S-shaped or zigzag structure. Therefore, the elastic support member is disposed in the gap between the cell assembly and the shell in the second direction, avoiding the cell assembly from generating a concentrated force point due to its own gravity, reducing the risk of the cell assembly edge on the non-tab side from breaking or shattering, and ensuring the integrity of the cell assembly, thereby ensuring that the lithium-ion battery can smoothly embed lithium ions during charging, avoiding the occurrence of lithium plating, and thereby improving the performance and cycle life of the battery. The embodiments of the present application use an S-shaped or zigzag-shaped elastic support member, which can avoid the problem of thick elastic support members being unable to fit into the shell and can reduce the weight of the battery cell. Detailed description is provided below.

[0039] like Figure 1 As shown, the battery cell is a side-standing (side-placed) structure, which includes a shell 1, an end cover 2, a battery cell assembly 3, a tab 4 and an elastic support 5.

[0040] A battery cell is a battery unit or the smallest energy unit of a battery. A battery cell or battery includes multiple battery cells. The battery cell includes a shell 1, an end cover 2, and a battery cell assembly 3 arranged in the shell 1. The shell 1 is connected to the end cover 2. The large surface of the battery cell is defined by the width edge and length edge of the battery cell, the small surface of the battery cell is defined by the width edge and height edge, and the end surface of the battery cell is defined by the length edge and width edge.

[0041] The battery cells have a first direction X, a second direction Y and a third direction Z that intersect with each other. The first direction X is the connection direction between the shell 1 and the end cover 2 (i.e., the extension direction of the length side of the battery cell), the second direction Y is the direction perpendicular to the first direction on the large surface of the battery cell assembly 3 (i.e., the extension direction of the width side of the battery cell), and the third direction Z is Figure 1 The direction passing through the paper (i.e. the extension direction of the height side of the battery cell).

[0042] like Figure 1 and Figure 2As shown, the housing 1 has an opening 11 in the longitudinal direction of the battery pack and a bottom opposite to the opening 11. Specifically, the housing 1 has a cavity and the opening 11 communicating with the cavity. The housing 1 has two opposing inner bottom surfaces 111 and an inner top surface 112 in the second direction.

[0043] In one embodiment, Figure 2 As shown, the housing 1 has two openings 11 disposed opposite each other in a first direction. Two end caps 2 are disposed at either end of the housing 1 to close the openings 11. The two end caps 2 are a first end cap 21 and a second end cap 22. The first end cap 21 is disposed at the left end of the housing 1 to close the left opening 11. The second end cap 22 is disposed at the right end of the housing 1 to close the right opening 11.

[0044] The first end cap 21 may be provided with an explosion-proof hole, a pole hole, and a liquid injection hole. The explosion-proof valve is installed in the explosion-proof hole, the pole is installed in the pole hole, and the electrolyte is injected through the liquid injection hole. Thus, the pole, explosion-proof valve, and other components are provided on the first end cap 21. The pole and the first end cap 21 may be integrally formed. The pole generally includes a positive pole and a negative pole.

[0045] like Figure 1 As shown, the battery cell assembly 3 is disposed in the housing 1, and the tab 4 is connected to the battery cell assembly 3 along the first direction X and extends toward the first end cover 21. Figure 3 As shown, the battery cell assembly 3 includes a main body 311, the tab 4 is connected to the main body 311 in the first direction X, and the orthographic projection length of the main body 311 in the second direction Y is the same as the orthographic projection length of the elastic support member 5 in the second direction Y.

[0046] like Figure 4 As shown, the main body 311 includes a positive electrode sheet 301, a negative electrode sheet 302 and a separator 303. The positive electrode sheet and the negative electrode sheet are stacked, and the separator is arranged between the adjacent positive electrode sheet 301 and the negative electrode sheet 302. Specifically, the battery cell assembly 3 can be a winding structure, that is, the separator 303 has a first curved portion 331 and a second curved portion 332 connected, and the opening direction of the first curved portion 331 is opposite to the opening direction of the second curved portion 332. Among them, the positive electrode sheet 301 is arranged in the first curved portion 331, and the negative electrode sheet 302 is arranged in the second curved portion 332. In other embodiments, the battery cell assembly 3 can be a laminated structure, that is, it is stacked in the order of positive electrode sheet 301, separator 303, negative electrode sheet 302, separator 303, positive electrode sheet 301...

[0047] The plurality of tabs 4 include a positive tab 41 and a negative tab 42. The positive tab 41 is connected to the positive electrode sheet 301, and the negative tab 42 is connected to the negative electrode sheet 302. The positive tab 41 and the positive electrode sheet 301 may be integrally formed, and the negative tab 42 and the negative electrode sheet 302 may be integrally formed.

[0048] like Figure 3 As shown, the battery cell assembly 3 has two opposite first and second surfaces 31 and 32 in the second direction Y, namely the bottom and top surfaces of the battery cell assembly 3. The battery cell assembly 3 has two side surfaces in the length direction, namely the left and right end surfaces of the battery cell assembly 3.

[0049] like Figure 1 As shown, the positive tab 41 and the negative tab 42 are arranged on the same side to form a battery cell assembly 3 with tabs 4 on the same side. The side of the battery cell assembly 3 with tabs 4 is the head of the battery cell assembly 3, and the side of the battery cell assembly 3 without tabs is the tail of the battery cell assembly 3.

[0050] When a battery cell is typically placed vertically or sideways, the cell assembly with the tabs on the same side is free from external forces. Consequently, the tail of the cell assembly experiences a concentrated force point and moves downward under the cell assembly's own weight. During this downward movement, the edges of the positive and / or negative electrode sheets at the tail of the cell assembly are susceptible to breakage or shattering, and the tabs can easily tear during the downward movement or transportation of the cell assembly.

[0051] In order to overcome the above problems, an elastic support member 5 is provided in the gap 10 between the battery cell assembly 3 and the shell 1 in the second direction to support the battery cell assembly 3, thereby avoiding the battery cell assembly 3 from generating a concentrated force point due to its own gravity, reducing the risk of fracture or breakage of the edge of the battery cell assembly 3 on the non-ear side, and ensuring the integrity of the battery cell assembly 3, thereby ensuring that the lithium-ion battery can smoothly embed lithium ions during the charging process, avoiding the occurrence of lithium plating, and thereby improving the performance and cycle life of the battery.

[0052] like Figure 1 As shown, the elastic support member 5 includes a first support portion 511 and a second support portion 512 connected to each other. The first support portion 511 supports the surface of the battery cell assembly 3, and the second support portion 512 supports the surface of the shell 1. The first support portion 511 and the second support portion 512 are alternately distributed in the first direction and form a concave-convex structure to avoid the problem that the elastic support member 5 with a larger thickness cannot enter the shell, and can reduce the weight of the battery cell.

[0053] In one embodiment, Figure 5As shown, the elastic support member 5 includes a first support segment 521, a second support segment 522 and a third support segment 523 connected to each other. The first support segment 521 and the second support segment 522 are connected to form a first support portion 511, and the second support segment 522 and the third support segment 523 are connected to form a second support portion 512.

[0054] The first support section 521 is arranged at a first angle to the surface of the housing 1, the second support section 522 is arranged at a second angle to the surface of the battery cell assembly 3, and the third support section 523 is arranged at a third angle to the surface of the battery cell assembly 3. This allows the bending modulus of the first support portion 511 to be the same as the bending modulus of the second support portion 512, ensuring the supporting effect of the elastic support member 5. It is understandable that Figure 5 The example shows that the first support section 521 is set at a first angle to the inner bottom surface 111 of the shell 1, the second support section 522 is set at a second angle to the bottom surface of the battery cell assembly 3, and the third support section 523 is set at a third angle to the bottom surface of the battery cell assembly 3.

[0055] In one embodiment, the first angle is equal to the third angle, so that the elastic support member 5 is more evenly stressed in the second direction Y. The angle formed between the second support segment 522 and the surface of the housing 1 is the same as the second angle.

[0056] In one embodiment, Figure 6 As shown, the first support portion 511 has a first support surface 531 and a second support surface 532 in the second direction Y. The first support surface 531 abuts the surface of the battery cell assembly 3, and a first gap 541 is defined between the second support surface 532 and the surface of the housing 1. The second support portion 512 has a third support surface 533 and a fourth support surface 534 in the second direction Y. The third support surface 533 abuts the surface of the housing 1, and a second gap 542 is defined between the fourth support surface 534 and the surface of the battery cell assembly 3. Therefore, the first support portions 511 and the second support portions 512 are alternately distributed in the first direction X and form a concave-convex structure. This concave-convex structure has an elastic deformation effect, which can facilitate the insertion of the elastic support member 5 into the housing.

[0057] The elastic support member 5 is disposed within the gap 10 between the cell assembly 3 and the housing 1 in the height direction. The elastic support member 5 abuts against both the cell assembly 3 and the housing 1, preventing the cell assembly 3 from shaking inside the housing 1. Therefore, the cell assembly 3 is protected from damage to the electrode sheet and tearing of the tab 4 during transportation and use, thereby ensuring that lithium ions can be smoothly embedded in the lithium-ion battery during charging, preventing lithium plating, and thereby improving the battery's performance and cycle life.

[0058] The compression amount of the elastic support member 5 is greater than or equal to the size of the gap 10 in the second direction Y, so that the elastic support member 5 can completely fill the gap 10. The compression amount of the elastic support member 5 is the difference between the uncompressed length and the compressed length of the elastic support member 5.

[0059] like Figures 7-8 As shown, the elastic support member 5 has an S-shaped or sawtooth structure.

[0060] The elastic support member 5 has a certain elasticity, and is made of at least one of polypropylene, polyethylene, and polyethylene terephthalate.

[0061] In one embodiment, Figure 1 or Figure 5 or Figure 6 As shown, a first gap 101 is defined between the inner bottom surface 111 of the housing 1 and the first surface 31 of the battery cell assembly 3. The elastic support member 5 includes a first elastic support member 51 disposed within the first gap 101, with the top support surface of the first elastic support member 51 abutting and supporting the bottom surface of the battery cell assembly 3, and the bottom support surface of the first elastic support member 51 abutting and supporting the inner bottom surface 111 of the housing 1.

[0062] Therefore, by disposing the first elastic support member 51 between the inner bottom surface 111 of the housing 1 and the first surface 31 of the battery cell assembly 3, the first elastic support member 51 abuts against the bottom surface of the battery cell assembly 3 and the inner bottom surface 111 of the housing 1 at the same time, thereby preventing the battery cell assembly 3 from shaking inside the housing 1. Therefore, the battery cell assembly 3 will not suffer from problems such as electrode sheet damage and electrode tab 4 tearing during transportation and use, thereby ensuring that lithium ions can be smoothly embedded in the lithium-ion battery during charging, avoiding the occurrence of lithium plating, and thus improving the performance and cycle life of the battery.

[0063] In one embodiment, Figure 9 As shown, a second gap 102 is defined between the inner top surface 112 of the housing 1 and the second surface 32 of the battery cell assembly 3. The elastic support member 5 further includes a second elastic support member 52, which is disposed within the second gap 102. The top support surface of the second elastic support member 52 abuts against the inner top surface 112 of the housing 1, and the bottom support surface of the second elastic support member 52 abuts against the top surface of the battery cell assembly 3.

[0064] Therefore, by arranging a first elastic support member 51 between the inner bottom surface 111 of the shell 1 and the first surface 31 of the battery cell assembly 3, and by arranging a second elastic support member 52 between the inner top surface 112 of the shell 1 and the second surface 32 of the battery cell assembly 3, the first elastic support member 51 simultaneously abuts the bottom surface of the battery cell assembly 3 and the inner bottom surface 111 of the shell 1, and the second elastic support member 52 simultaneously abuts the top surface of the battery cell assembly 3 and the inner top surface 112 of the shell 1, so as to further prevent the battery cell assembly 3 from shaking inside the shell 1. Therefore, the battery cell assembly 3 will not suffer from problems such as electrode sheet damage and electrode tab 4 tearing during transportation and use, thereby ensuring that lithium ions can be smoothly embedded in the lithium-ion battery during charging, avoiding the occurrence of lithium plating, and thus improving the performance and cycle life of the battery.

[0065] In one embodiment, Figure 9 As shown, the first elastic support member 51 and the second elastic support member 52 are symmetrically arranged in the first direction, which can effectively ensure that the battery cell assembly 3 is located in the middle position of the shell 1 after being inserted into the shell, and no displacement occurs during insertion into the shell.

[0066] The present application also provides a battery pack, comprising a housing and the above-mentioned battery cells, wherein the battery cells are disposed within the housing. The battery pack serves as a power supply for electrical devices. Electrical devices may be mobile phones, portable devices, laptop computers, electric vehicles, electric cars, ships, spacecraft, electric toys, and electric tools. For example, spacecraft include airplanes, rockets, space shuttles, and spacecrafts; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; and electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. In the battery pack, the elastic support member 5 is disposed within the gap 10 in the height direction between the battery cell assembly 3 and the housing 1. The elastic support member 5 abuts against both the battery cell assembly 3 and the housing 1 to prevent the battery cell assembly 3 from shaking inside the housing 1. Therefore, during the transportation and use of the battery cell assembly 3, there will be no problem of electrode damage and electrode ear 4 tearing, thereby ensuring that the lithium-ion battery can smoothly embed lithium ions during the charging process, avoiding the occurrence of lithium plating, and thus improving the battery performance and cycle life.

[0067] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] The above is a detailed introduction to a battery cell and a battery pack provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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 application.

Claims

1. A battery cell, characterized in that: include: a housing having an opening; an end cover, provided on the housing and used to close the opening; A battery cell assembly is disposed in the shell, wherein a gap is formed between the battery cell assembly and the shell in the second direction of the battery cell, wherein the first direction of the battery cell is the connection direction between the shell and the end cover, and the second direction of the battery cell is the direction perpendicular to the first direction on the large surface of the battery cell assembly; a tab connected to the battery cell assembly and extending along the first direction to the end cap; and An elastic support member is arranged in the gap, and the elastic support member includes a first support portion and a second support portion that are connected. A plurality of the first support portions and a plurality of the second support portions are alternately connected in the first direction to form an S-shaped or sawtooth-shaped structure.

2. The battery cell according to claim 1, characterized in that: The elastic support member includes a first support segment, a second support segment and a third support segment that are connected to each other. The first support segment and the second support segment are connected to form the first support portion, and the second support segment and the third support segment are connected to form the second support portion.

3. The battery cell according to claim 2, characterized in that: The first support section is arranged at a first angle to the surface of the shell, the second support section is arranged at a second angle to the surface of the battery cell assembly, and the third support section is arranged at a third angle to the surface of the battery cell assembly; The first angle is equal to the third angle.

4. The battery cell according to claim 1 or 2, characterized in that: The first supporting portion has a first supporting surface and a second supporting surface in the second direction, the first supporting surface abuts against the surface of the battery cell assembly, and a first gap is provided between the second supporting surface and the surface of the shell; The second supporting portion has a third supporting surface and a fourth supporting surface in the second direction, the third supporting surface abuts against the surface of the shell, and a second gap is provided between the fourth supporting surface and the surface of the battery cell assembly.

5. The battery cell according to claim 1, characterized in that: The housing has an inner bottom surface in the second direction, and the battery cell assembly has a first surface in the second direction; The gap includes a first gap, the elastic support member includes a first elastic support member, the first gap is provided between the inner bottom surface and the first surface, and the first elastic support member is disposed in the first gap.

6. The battery cell according to claim 5, characterized in that: The housing has an inner top surface opposite to the inner bottom surface in the second direction, and the battery cell assembly has a second surface opposite to the first surface in the second direction; The gap further includes a second gap, the elastic support member further includes a second elastic support member, the second gap is provided between the inner top surface and the second surface, and the second elastic support member is disposed in the second gap.

7. The battery cell according to claim 1, characterized in that: The battery cell assembly includes a main body, the tab is connected to the main body in the first direction, and the orthographic projection length of the main body in the second direction is the same as the orthographic projection length of the elastic support member in the second direction.

8. The battery cell according to claim 7, characterized in that: The main body includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet are stacked, and the separator is arranged between the positive electrode sheet and the negative electrode sheet.

9. The battery cell according to claim 1, characterized in that: The compression amount of the elastic supporting member is greater than or equal to the size of the gap in the second direction.

10. A battery pack, characterized in that: include: Box; as well as The battery cell according to any one of claims 1 to 9, wherein the battery cell is arranged in the box.

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