Battery monomer and battery module

Abstract

The utility model discloses a single battery and a battery module, the single battery comprises a shell, a lead, a lead, a lead and a lead, the end face of at least one end of the shell is provided with a tab outlet; the pole assembly is installed on the end face of the at least one end, a tab containing groove is formed in the pole assembly, and the tab containing groove is communicated with the tab outlet in a directly facing mode; the battery cell is provided with a battery cell pole lug, and the battery cell pole lug penetrates through the pole lug outlet and extends to the pole lug containing groove so as to be connected with the pole column assembly. According to the utility model, the battery monomer and the pole assembly are connected to the end face of the shell and are communicated with the pole lug outlet to form the pole lug accommodating groove, and when the battery core pole lug is connected with the pole assembly, the battery core pole lug is connected outside the shell, so that the risk that welding slag falls into the shell is reduced, the space occupied by the pole lug in the shell is reduced, and the volume energy density of the battery is improved.

Description

Technical Field

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

[0002] A battery cell includes a housing, an end cap, and an electrode assembly disposed within the housing. The end cap has a terminal post. In the assembly process of the battery cell, the electrode assembly needs to be placed into the housing and connected to the terminal post on the end cap. Then, the end cap is welded to the housing to complete the assembly. It can be seen that the assembly process of the battery cell is complex.

[0003] The blade battery has end caps at both ends. After the end caps are welded to the casing, there is a folding space inside the end caps to accommodate the tabs. The tabs are welded to the end caps and terminals inside the casing, resulting in low internal volume utilization of the battery. In addition, a small amount of welding slag is usually generated during the welding process of the tabs. If the welding slag is not treated, it will enter the battery and affect the quality of the battery. The welding slag can easily cause the battery to short-circuit. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery cell in which the terminal assembly is connected to the end face of the casing and communicates with the tab outlet to form a tab receiving groove. When the cell tab is connected to the terminal assembly, the connection is made outside the casing, thereby reducing the risk of welding slag falling into the casing and improving the volumetric energy density of the battery.

[0005] A battery cell according to an embodiment of the present invention includes: a housing, a terminal assembly, and a battery cell; at least one end face of the housing has a tab outlet; the terminal assembly is mounted on the end face of the at least one end, the terminal assembly has a tab receiving groove, the tab receiving groove is directly opposite to and communicates with the tab outlet; the battery cell is connected to a battery cell tab, the battery cell tab passes through the tab outlet and extends into the tab receiving groove to be connected to the terminal assembly.

[0006] According to the battery cell of this utility model embodiment, the terminal assembly is connected to the end face of the housing and communicates with the tab outlet to form a tab receiving groove. When the cell tab is connected to the terminal assembly, the connection is on the outside of the housing, thereby reducing the risk of welding slag falling into the housing, which reduces the risk of battery short circuit, and reduces the space occupied by the cell tab in the housing, thereby increasing the volumetric energy density of the battery.

[0007] According to the battery cell of this utility model embodiment, the first end of the housing is integrally formed and the second end is connected to an end cap; the electrode assembly is connected to the first end, the electrode assembly includes a first electrode, the cell tab includes a first tab and a second tab located at both ends of the cell, the first tab extends to the tab receiving groove and is connected to the first electrode, the end cap is provided with a second electrode, and the second tab is connected to the end cap to be connected to the second electrode.

[0008] According to an embodiment of the present invention, the battery cell includes an insulating frame connected to the tab outlet, and the first electrode is connected to the insulating frame and forms the tab receiving groove with the insulating frame.

[0009] According to the battery cell of the present invention, the terminal assembly further includes a sealing element, which seals the gap between the first electrode and the housing at the electrode outlet, and / or the sealing element seals the gap between the first terminal and the insulating frame.

[0010] According to the battery cell of this utility model embodiment, the housing is provided with an insulating plate, the insulating plate has an insulating outlet, and the first electrode tab extends through the insulating outlet and the electrode tab outlet to the electrode tab receiving groove to connect to the first electrode post.

[0011] According to an embodiment of the present invention, in a battery cell, the outer periphery of the insulating outlet of the insulating plate is provided with an extension portion extending toward the tab outlet, the extension portion forming a receiving cavity for accommodating the first tab, and the receiving cavity communicating with the tab receiving groove.

[0012] According to the battery cell of this utility model embodiment, the first electrode post is constructed as an electrode sheet.

[0013] According to the battery cell of this utility model embodiment, the first tab is adapted to be selectively connected with a first lead piece, the first lead piece being connected to the first terminal post, and / or the second tab is adapted to be selectively connected with a second lead piece, the second lead piece being connected to the end cap.

[0014] According to an embodiment of the present invention, the battery cell includes a first end and a second end. The first end is used to connect to the first tab, and the second end is used to connect to the second tab. The distance between the first end and the housing is X2, and the distance between the second end and the housing is X1, and X2 < X1.

[0015] This utility model embodiment also discloses a battery module, including the aforementioned multiple battery cells.

[0016] The advantages of the battery module and the battery cell are the same, and will not be repeated here.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a cross-sectional view of a battery cell according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the shell structure according to an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the electrode post assembly, insulating plate, and electrode tab bursting open according to an embodiment of this utility model. Figure 1 ;

[0022] Figure 4 This is a schematic diagram of the structure of the electrode post assembly, insulating plate, and electrode tab bursting open according to an embodiment of this utility model. Figure 2 ;

[0023] Figure 5 This is a schematic diagram of the structure of a single battery cell according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the battery module structure according to an embodiment of the present invention;

[0025] Figure 7 This is a flowchart of the welding steps between the battery cell tab and the electrode post according to an embodiment of the present invention.

[0026] Figure label:

[0027] 100 individual battery cells, 1000 battery modules.

[0028] Battery cell 1, first tab 11, second tab 12, housing 2, end cap 21, second pole post 211, tab outlet 22, opening 23, insulating plate 3, extension 31, pole post assembly 4, insulating frame 41, sealing element 42, first pole post 43, liquid injection hole 5, explosion-proof valve 6. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The following is for reference. Figures 1-7 According to the embodiment of the present utility model, the battery cell 100 has a terminal assembly 4 connected to the end face of the housing 2 and communicating with the tab outlet 22 to form a tab receiving groove. When the cell tab is connected to the terminal assembly 4, the connection is made outside the housing 2, thereby reducing the risk of welding slag falling into the housing 2, reducing the space occupied by the cell tab inside the housing 2, and improving the volumetric energy density of the battery.

[0033] like Figure 1-7 As shown, a battery cell 100 according to an embodiment of the present invention includes: a housing 2, an electrode assembly 4, and a battery cell 1.

[0034] The housing 2 has a tab outlet 22 formed on the end face of at least one end; the electrode assembly 4 is installed on the end face of at least one end, and the electrode assembly 4 has a tab receiving groove, which is directly connected to the tab outlet 22; the battery cell 1 is connected to a battery cell tab, which passes through the tab outlet 22 and extends to the tab receiving groove to be connected to the electrode assembly 4.

[0035] In practice, the battery cell 1 is placed inside the casing 2, thereby protecting the battery cell 1 and preventing leakage. Each end of the battery cell 1 is connected to a battery cell tab, and each battery cell tab is connected to a corresponding terminal post, which is responsible for conducting current so that the battery can be connected to an external circuit.

[0036] Specifically, when the battery cell 1 is located inside the housing 2, a tab outlet 22 is provided on one end face of the housing 2. By pulling the battery cell tab out from the tab outlet 22 to the outside of the housing 2, and the outer side of the housing 2 is provided with a terminal assembly 4, the battery cell tab is connected to the terminal assembly 4 on the outside of the housing 2 after being pulled out from the tab outlet 22. This avoids the situation where the battery cell tab is placed inside the housing 2, and the welding slag generated when welding the battery cell tab to the terminal assembly 4 falls into the housing 2. When the welding slag falls into the housing 2, it will seriously affect the quality of the battery. The welding slag can easily cause a short circuit risk to the battery. In other words, by pulling the battery cell tab out of the housing 2, the welding slag is prevented from falling into the housing 2, thereby reducing the risk of battery short circuit and reducing the impact on battery quality.

[0037] In addition, when the battery cell tab is pulled out of the housing 2 and inserted into the tab receiving groove to connect to the terminal assembly 4, the space occupied by the battery cell tab inside the housing 2 is reduced, thereby increasing the volumetric energy density of the battery.

[0038] In some embodiments, the first end of the housing 2 is integrally formed and the second end is connected to the end cap 21; the pole assembly 4 is connected to the first end, the pole assembly 4 includes a first pole 43, the battery cell tabs include a first tab 11 and a second tab 12 located at both ends of the battery cell 1, the first tab 11 extends to the tab receiving groove and is connected to the first pole 43, the end cap 21 is provided with a second pole 211, and the second tab 12 is connected to the end cap 21 to be connected to the second pole 211.

[0039] In practice, it can be referred to Figure 1 and Figure 2As shown, the first end is the left end and the second end is the right end. The left end of the housing 2 is integrally formed, and the right end has an open opening 23. First, the battery cell 1 with the first tab 11 and the second tab 12 connected at both ends is placed into the housing 2 through the open opening 23. After pulling the first tab 11 out from the tab outlet 22 at the left end of the housing 2, the first tab 11 is connected to the pole assembly 4, that is, connected to the first pole 43. The first pole 43 is connected to the external circuit. At the same time, the second tab 12 is located inside the housing 2, and the second pole 211 is connected to the outside of the end cap 21. The second tab 12 is connected to the inside of the end cap 21, and the end cap 21 is connected to the housing 2, thereby realizing the function of encapsulating and protecting the battery cell 1. That is, the housing 2 and the end cap 21 are initially set as separate parts and then welded and encapsulated, so that the battery cell 1 can be smoothly installed into the housing 2.

[0040] At this time, the two ends of the housing 2 are asymmetrical structures. The first electrode 11 on the left can be pulled out of the housing 2 and is located in the electrode receiving groove. This reduces the risk of welding slag falling into the housing 2 due to the welding of the first electrode 11 and the first electrode post 43 on the left inside the housing 2. At the same time, the first electrode 11 is partially located in the electrode receiving groove, while the electrode receiving groove is on the outside of the housing 2, which is equivalent to saving space inside the housing 2.

[0041] Of course, assuming that both ends of the housing 2 are provided with open openings 23, the battery cell 1 is placed inside the housing 2, and a tab outlet 22 can be provided on each end cap 21, and a terminal post assembly 4 is connected to the outside of the tab outlet 22 of each end cap 21. Thus, the first tab 11 at one end of the battery cell 1 is pulled out and connected to the corresponding terminal post assembly 4, and then the second tab 12 at the other end is pulled out and connected to the corresponding other set of terminal post assemblies 4. Then, the two end caps 21 are respectively connected to the two ends of the housing 2, which can also achieve the first tab 11 and the second tab 12 extending out of the housing 2 and connecting to the corresponding terminal post assembly 4. However, at this time, it is extended through the end cap 21, which can save the space inside the housing 2, reduce the problem of slag falling off when welding the first tab 11 and the first terminal post 43, and also solve the problem of slag falling off when welding the second tab 12 and the second terminal post 211.

[0042] However, in actual design, considering that welding is more complicated when end caps 21 are set at both ends, the present utility model embodiment has an end cap 21 set at one end and the other end is integrally formed, that is, an asymmetrical end cap 21 structure. Setting the battery cell tab at one end to be pulled out of the housing 2 and welded to the corresponding electrode post can also reduce the risk of welding slag falling into the housing 2 and save the space inside the housing 2.

[0043] In some embodiments, the electrode assembly 4 includes an insulating frame 41 connected to the tab outlet 22, and a first electrode post 43 connected to the insulating frame 41 and forming a tab receiving groove with the insulating frame 41.

[0044] In practice, the insulating frame 41 can insulate the first electrode 11 from the housing 2. The shape of the insulating frame 41 is adapted to the shape of the electrode outlet 22. For example, if the electrode outlet 22 is square, the insulating frame 41 is constructed as a square. The insulating frame 41 can protrude from the outside of the housing 2 along the inner wall of the electrode outlet 22. The insulating frame 41 can form a space to accommodate the first electrode 11, so that the first electrode 11 occupies less space inside the housing 2. When the first pole post 43 is connected to the protruding first electrode 11, the first pole post 43 can be connected to the insulating frame 41, thus forming a closed structure.

[0045] In addition, connecting the first pole post 43 to the insulating frame 41 forms a space to accommodate the first pole lug 11. The first pole post 43 is only located at the end of the insulating frame 41, which can also reduce the volume and weight of the first pole post 43.

[0046] In some embodiments, the pole assembly 4 further includes a seal 42 that seals the gap between the first pole tab 11 and the housing 2 at the pole tab outlet 22, and / or the seal 42 seals the gap between the first pole 43 and the insulating frame 41.

[0047] Combination Figure 3 and Figure 4 As shown, two sealing frames are provided on each side of the insulating frame 41. When the insulating frame 41 is connected to the housing 2 at the tab outlet 22, a sealing frame is provided between the insulating frame 41 and the housing 2 along the length of the cell 1. In addition, the insulating frame 41 and the first pole post 43 are sealed by the sealing frame, which reduces the risk of the first tab 11 coming into contact with the external environment, improves the safety performance of the battery cell 100, reduces the risk of failure of the battery cell 100 during use, extends the service life of the battery cell 100, and improves the integrity of the connection between the first tab 11 and the first pole post 43.

[0048] In some embodiments, the housing 2 is provided with an insulating plate 3, the insulating plate 3 has an insulating outlet, and the first electrode tab 11 extends through the insulating outlet and the electrode tab outlet 22 to the electrode tab receiving groove to connect to the first electrode post 43.

[0049] The housing 2 is a metal housing, and the battery cell 1 is a conductive structure. When the first electrode 11 is pulled out from the end of the battery cell 1, the insulating plate 3 is located inside the housing 2. The cross-sectional area of ​​the insulating plate 3 is the same as the side area of ​​the connecting pole assembly 4 of the housing 2, so that the insulating plate 3 is basically located on the inner side wall of one end of the housing 2. The insulating plate 3 is provided with an insulating outlet, so that the first electrode 11 passes through the insulating outlet and then out of the electrode outlet 22. This prevents the outer periphery of the first electrode 11 from being exposed, which would increase the risk of short circuit due to contact with the housing 2 and other conductive materials inside the housing 2. This can achieve better insulation between the first electrode 11 and the housing 2. The insulating plate 3 can be made of insulating materials such as ceramic and plastic.

[0050] In some embodiments, the outer periphery of the insulating outlet of the insulating plate 3 is provided with an extension 31 extending toward the tab outlet 22. The extension 31 forms a receiving cavity for accommodating the first tab 11, and the receiving cavity is in communication with the tab receiving groove.

[0051] In other words, the insulating plate 3 has an insulating opening, and the extension 31 extends along the length of the insulating opening toward the cell 1. The extension 31 surrounds the outer periphery of the insulating opening. If the insulating opening is a square hole, the extension 31 is constructed as a square frame surrounding the outer periphery of the insulating opening. The first tab 11 passes through the insulating outlet, that is, through the extension 31. The extension 31 is equivalent to forming a tab receiving cavity. When the second tab 12 extends through the insulating outlet, the extension 31 is also made of the same material as other parts of the insulating plate 3, which is insulating material. This means that the extension 31 isolates the outside of the second tab 12 from the space inside the shell 2, thereby reducing the risk of short circuit caused by the tab contacting other conductive materials, such as reducing the probability of short circuit with the active material coating part, reducing the probability of short circuit inside the cell 1, and thus improving the working reliability and stability of the battery cell 100 and the battery.

[0052] The active material coating part is the core part of cell 1, mainly composed of positive electrode material and negative electrode material. The positive electrode material includes layered structure, spinel structure and olivine structure, which correspond to ternary materials such as lithium cobalt oxide, lithium manganese oxide and lithium iron phosphate respectively. The negative electrode material mainly includes carbon material and non-carbon material. The carbon material can be graphite and the non-carbon material can be silicon-based material.

[0053] In some embodiments, the first electrode post 43 is constructed as an electrode sheet. Setting the first electrode post 43 as an electrode sheet facilitates the formation of a tab receiving groove between the first electrode post 43 and the insulating frame 41, and also facilitates the welding between the first electrode post 43 and the first tab 11. The electrode sheet form increases the welding area between the first electrode post 43 and the first tab 11, improving the reliability of the connection. Furthermore, compared to a columnar electrode post, the electrode sheet form is thinner, uses less material, and is lighter. (Refer to...) Figure 1As shown, the first electrode post 43 on the left is constructed as an electrode sheet, and the second electrode post 211 on the right is constructed as a columnar structure, which can reduce the length of the entire battery cell 100.

[0054] In some embodiments, the first tab 11 is adapted to be selectively connected with a first lead-out piece, the first lead-out piece being connected to a first pole post 43, and / or the second tab 12 is adapted to be selectively connected with a second lead-out piece, the second lead-out piece being connected to an end cap 21.

[0055] In practice, when the first tab 11 is connected to the first terminal 43, if the length of the first tab 11 is short, a first lead-out piece can be connected to the first tab 11 and then connected to the first terminal 43. The first lead-out piece is made of a conductive metal material to achieve an electrical connection between the first terminal 43 and the first tab 11. Similarly, a second terminal 211 can be connected to the outside of the end cap 21, and a second lead-out piece can be connected to the inside of the end cap 21 to achieve an electrical connection between the second lead-out piece and the second terminal 211. Then, the second lead-out piece is welded to the second tab 12, and finally, the housing 2 is welded to the end cap 21 to achieve an electrical connection between the second tab 12 and the second terminal 211.

[0056] In some embodiments, the battery cell 1 includes a first end and a second end, the first end being used to connect to a first tab 11, the second end being used to connect to a second tab 12, the distance between the first end and the housing 2 being X2, the distance between the second end and the housing 2 being X1, and satisfying: X2 < X1.

[0057] Continue to refer to Figure 1 As shown, the first tab 11 of the battery cell 1 is located at the left end and the second tab 12 is located at the right end. That is, the first end of the battery cell 1 is the left end and the second end is the right end. The distance between the left end of the battery cell 1 and the left side of the housing 2 is X2, and the distance between the right end of the battery cell 1 and the end cap 21 is X1. The following conditions must be met: 1mm ≤ X1 ≤ 20mm, and X2 must be less than X1. For example, if X1 is 4mm, then X2 is 1mm. In general, the first tab 11 and the second tab 12 are both inside the housing 2. When the first tab 11 is pulled out of the housing 2 in this embodiment of the invention... When the first electrode 1 is connected to the first terminal 43, or when the second electrode 12 is pulled out to the outside of the housing 2 and connected to the second terminal 211, the distance between at least one end of the cell 1 and the side wall of the housing 2 can be reduced, thereby increasing the installation space inside the housing 2 and reducing the space occupied by the first electrode 11 or the second electrode 12 inside the housing 2. When the size of the housing 2 is fixed, some space can be saved inside the housing 2, improving the utilization rate of the cell 1 in the length direction, so as to accommodate a larger active material coating part and improve the volumetric energy density of the battery cell 100.

[0058] At the same time, at least a portion of the first tab 11 or the second tab 12 is accommodated in the corresponding tab receiving groove, so that the space occupied by the battery cell 100 itself can be reduced, so that a battery of the same volume can accommodate more battery cells 100, thereby increasing the volumetric energy density of the battery.

[0059] Moreover, one end of the housing 2 is provided with an end cap 21, and the other end is integrally formed, which can reduce the number of end caps 21, reduce costs, reduce the welding of the end caps 21, reduce processes and improve welding yield, and reduce leakage problems caused by poor welding of the end caps 21 and short circuits between batteries caused by battery corrosion.

[0060] This utility model discloses a battery module 1000, including the aforementioned plurality of battery cells 100. (Refer to...) Figure 6 As shown, multiple battery cells 100 are arranged and connected. The first terminal 43 and the second terminal 211 on the same side of two adjacent battery cells 100 are adjacent. When multiple battery cells 100 are connected in series, the first terminal 43 of one battery cell 100 is connected to the second terminal 211 of the adjacent battery cell 100, and so on, to form a larger capacity battery module 1000. After saving space in the casing 2 of each battery cell 100, the multiple casings 2 of multiple battery cells 100 can be used to set larger capacity cells 1, thereby increasing the volumetric energy density of the battery module 1000. In addition, it also reduces the risk of welding slag in multiple cells 1, thereby reducing the risk of short circuit and improving the safety of the battery module 1000, which means increasing the battery life.

[0061] in addition, Figure 6 Each battery cell 100 is also equipped with an electrolyte injection hole 5. During the battery manufacturing process, electrolyte is injected into the battery through the electrolyte injection hole 5 to ensure the normal operation of the battery. In addition, an explosion-proof valve 6 is provided on the upper side of the electrolyte injection hole 5. The explosion-proof valve 6 can be in the form of an explosion-proof plate or a groove. Due to overcharging, over-discharging, short circuit, etc., excessive gas may be generated inside the battery, causing the internal pressure of the battery to rise. The explosion-proof valve 6 of the battery cell 100 is located on the side wall of the battery cell 100. The explosion-proof valve 6 can control the pressure of the gas inside the battery module 1000 through its own pressure control device to prevent the battery module 1000 from exploding or catching fire due to excessive expansion.

[0062] In actual design, this utility model embodiment includes the following steps: (Refer to...) Figure 7As shown, firstly, the bare cell 1 is placed into the housing 2, and the first tab 11 is pulled out. Then, the first tab 11 is welded to the first terminal 43, and the first terminal 43 is sealed to the housing 2 using materials such as an insulating frame 41 and a sealing element 42. When the end cap 21 is provided with a second lead-out piece on the side where it connects to the second tab 12, the second tab 12 is then welded to the second lead-out piece. The second lead-out piece is electrically connected to the second terminal 211. Welding the second tab 12 to the second lead-out piece achieves an electrical connection between the second tab 12 and the second terminal 211. Then, the end cap 21 is welded to the housing 2 to complete the encapsulation of the battery cell 100.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that, include: The housing (2) has a tab outlet (22) formed on the end face of at least one end of the housing (2); The pole assembly (4) is mounted on the end face of at least one end, and the pole assembly (4) has a tab receiving groove, which is directly connected to the tab outlet (22). The battery cell (1) is connected to a battery cell tab, which passes through the tab outlet (22) and extends to the tab receiving groove to be connected to the pole assembly (4).

2. The battery cell (100) according to claim 1, characterized in that, The first end of the shell (2) is integrally formed and the second end is connected to an end cap (21); The electrode assembly (4) is connected to the first end. The electrode assembly (4) includes a first electrode (43). The battery cell tab includes a first tab (11) and a second tab (12) located at both ends of the battery cell (1). The first tab (11) extends into the tab receiving groove and is connected to the first electrode (43). The end cap (21) is provided with a second electrode (211). The second tab (12) is connected to the end cap (21) to be connected to the second electrode (211).

3. The battery cell (100) according to claim 2, characterized in that, The pole assembly (4) includes an insulating frame (41) connected to the tab outlet (22), and the first pole (43) is connected to the insulating frame (41) and forms the tab receiving groove with the insulating frame (41).

4. The battery cell (100) according to claim 3, characterized in that, The pole assembly (4) further includes a seal (42) that seals the gap between the first pole tab (11) and the housing (2) at the pole tab outlet (22), and / or the seal (42) seals the gap between the first pole (43) and the insulating frame (41).

5. The battery cell (100) according to claim 4, characterized in that, The housing (2) is provided with an insulating plate (3), which has an insulating outlet. The first electrode (11) extends through the insulating outlet and the electrode outlet (22) to the electrode receiving groove and connects to the first electrode post (43).

6. The battery cell (100) according to claim 5, characterized in that, The outer periphery of the insulating outlet of the insulating plate (3) is provided with an extension (31) extending toward the tab outlet (22), the extension (31) forming a receiving cavity for accommodating the first tab (11), the receiving cavity being in communication with the tab receiving groove.

7. The battery cell (100) according to claim 2, characterized in that, The first pole post (43) is constructed as a pole piece.

8. The battery cell (100) according to claim 2, characterized in that, The first tab (11) is adapted to be selectively connected with a first lead-out piece, the first lead-out piece being connected to the first pole post (43), and / or the second tab (12) is adapted to be selectively connected with a second lead-out piece, the second lead-out piece being connected to the end cap (21).

9. The battery cell (100) according to claim 2, characterized in that, The battery cell (1) includes a first end and a second end. The first end is used to connect to the first tab (11), and the second end is used to connect to the second tab (12). The distance between the first end and the housing (2) is X2, and the distance between the second end and the housing (2) is X1, and X2 < X1.

10. A battery module (1000), characterized in that, It includes a battery cell (100) as described in any one of claims 1-9.

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