Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a single battery and a battery pack. The battery pack provided by the utility model comprises a shell and a battery cell, wherein the shell is provided with a containing cavity and an open opening, and the battery cell is arranged in the containing cavity; the battery cell comprises an end cover assembly, a current collecting component and an electrode assembly, and the end cover assembly covers the opening and is in sealed connection with the shell; the current collecting component comprises a first connecting part and a second connecting part, the first connecting part is connected with a first tab of the electrode assembly, and the second connecting part is connected with the end cover assembly; wherein the first connecting part and the second connecting part are connected through an elastic piece, so that the first connecting part is in compression joint with the first tab in the direction away from the end cover assembly, and the risk of poor welding caused by poor contact between the current collecting component and the first tab or untight contact between the current collecting component and the tab can be reduced; and the reliability and the safety of the battery are improved.

Description

Technical Field

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

[0002] The batteries used most in vehicles are generally lithium-ion batteries. As a rechargeable battery, lithium-ion batteries have the advantages of small size, high energy density, high power density, many cycles and long storage time.

[0003] A battery cell generally includes a housing and an electrode assembly. The housing is used to contain the electrode assembly and electrolyte, and generates electrical energy by the movement of metal ions (such as lithium ions) between the positive and negative electrode sheets of the electrode assembly. For a general battery cell, the electrode assembly needs to be electrically connected to the housing so that the housing serves as the positive output electrode or negative output electrode of the battery cell. At present, the electrical connection between the electrode assembly and the housing is prone to failure, affecting the reliability and safety of the battery. Summary of the invention

[0004] The present disclosure provides a battery cell and a battery pack to at least solve the above technical problems existing in the prior art.

[0005] The first aspect of the present disclosure provides a battery cell, comprising: a shell and a battery cell:

[0006] The shell has a receiving cavity and an open opening, and the battery cell is arranged in the receiving cavity;

[0007] The battery cell comprises an end cap assembly, a current collecting component and an electrode assembly, wherein the end cap assembly covers the opening and is sealed and connected to the shell;

[0008] The current collecting component includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the first electrode tab of the electrode assembly, and the second connecting portion is connected to the end cap assembly;

[0009] The first connecting portion and the second connecting portion are connected via an elastic member so that the first connecting portion is crimped to the first pole lug in a direction away from the end cover assembly.

[0010] Furthermore, the elastic member includes an elastic arm, one end of the elastic arm is connected to the first connecting portion, and the other end of the elastic arm is connected to the second connecting portion.

[0011] Furthermore, along the direction from the first connecting portion to the second connecting portion, the elastic arm is arc-shaped, and the second connecting portion is bent toward a direction close to the electrode assembly.

[0012] Furthermore, the first connecting portion is plate-shaped, and the shape of the first connecting portion is consistent with the shape of a cross section of the electrode assembly perpendicular to the height direction Z.

[0013] Furthermore, the number of the second connecting parts and the elastic arms are both multiple, the multiple second connecting parts are arranged at intervals, the multiple second connecting parts are centrally symmetrical with respect to the central axis of the end cover assembly, and the second connecting parts are connected to the elastic arms one by one.

[0014] Furthermore, the second connection portion is in an arc shape, and a plurality of the second connection portions form a ring shape.

[0015] Further, the end cover assembly includes a cover body and a cover plate, the cover body is provided with a through hole extending along the height direction of the cover body, and the inner wall of the through hole is formed with a first step portion and a second step portion;

[0016] The first step portion includes a first surface, and the second connecting portion covers the first surface and is fixedly connected to the first surface;

[0017] The second step portion includes a second surface, and the cover plate covers the second surface and is fixedly connected to the second surface.

[0018] Further, along the height direction Z of the end cover assembly, the first surface is located at the top of the first step portion;

[0019] Further, along the height direction Z of the end cover assembly, the second surface is located at the top of the second step portion.

[0020] Furthermore, a slot is provided on an outer side wall of the cover body, an insulating member is provided in the slot, the insulating member is provided with a slot, and an end of the shell is arranged in the slot.

[0021] Furthermore, the second electrode tab of the electrode assembly is connected to the cover body, and the cover body is connected to the shell.

[0022] Furthermore, the shell is provided with a plurality of openings, and the battery cells correspond to the openings one by one.

[0023] Furthermore, the shell is provided with a first liquid injection hole, the first liquid injection hole is connected to a first liquid replenishment tube, the first liquid replenishment tube is made of a material that can be hot-melt or hot-glue sealed, and the end of the first liquid replenishment tube away from the first liquid injection hole is sealed.

[0024] Furthermore, the shell is provided with a second liquid injection hole, the second liquid injection hole is connected to a second liquid replenishment tube, the second liquid replenishment tube is made of a material that can be hot-melt or hot-glue sealed, and the end of the second liquid replenishment tube away from the second liquid injection hole is sealed.

[0025] A second aspect of the present disclosure provides a battery pack, comprising the battery cell described in the first aspect.

[0026] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0027] The battery cell provided in the embodiment of the present disclosure includes a shell and a battery cell, the shell has a accommodating cavity and an open opening, and the battery cell is arranged in the accommodating cavity; the battery cell includes an end cap assembly, a current collecting component and an electrode assembly, the end cap assembly covers the opening and is sealed and connected to the shell; the current collecting component includes a first connecting part and a second connecting part, the first connecting part is connected to the first pole ear of the electrode assembly, and the second connecting part is connected to the end cap assembly; wherein the first connecting part and the second connecting part are connected by an elastic member so that the first connecting part is pressed against the first pole ear in a direction away from the end cap assembly. The elastic force generated by the elastic member in the embodiment of the present disclosure can make the first connecting part generate pressure toward the first pole ear, so that the first connecting part always abuts against the first pole ear, thereby reducing the risk of poor contact between the current collecting component and the first pole ear or poor welding caused by loose contact between the current collecting component and the pole ear, thereby improving the reliability and safety of the battery.

[0028] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0030] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0031] Figure 1 A schematic diagram of the front structure of a battery cell provided by an embodiment of the present disclosure is shown;

[0032] Figure 2 for Figure 1 AA section view;

[0033] Figure 3 for Figure 2 The enlarged view of point a in the middle;

[0034] Figure 4 A schematic diagram of the front view of the end cover assembly in a battery cell provided by an embodiment of the present disclosure is shown;

[0035] Figure 5 for Figure 4BB section view;

[0036] Figure 6 A schematic diagram of the structure of the end cover assembly of a battery cell provided by an embodiment of the present disclosure after the cover plate is removed is shown;

[0037] Figure 7 A schematic diagram of the structure of a current collecting component in a battery cell provided by an embodiment of the present disclosure is shown;

[0038] Figure 8 A schematic structural diagram of a battery cell provided in an embodiment of the present disclosure is shown.

[0039] Explanation of the numbers in the figure: 1. Shell; 2. Battery cell; 21. End cover assembly; 211. Cover body; 211a. First step portion; 211b. Second step portion; 212. Through hole; 212. Cover plate; 22. Current collecting component; 221. First connecting portion; 222. Second connecting portion; 223. Elastic member; 23. Electrode assembly; 231. First pole ear; 3. First liquid replenishing tube; 4. Second liquid replenishing tube; 5. Insulating member. DETAILED DESCRIPTION

[0040] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0041] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries. Battery cells may be cylindrical, flat, rectangular or other shapes. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells. For general battery cells, the electrode assembly needs to be electrically connected to the shell so that the shell serves as the positive output electrode or negative output electrode of the battery cell.

[0042] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. The electrode assembly can be a winding structure or a stacked structure, and the embodiments of the present application are not limited to this.

[0043] For a general battery cell, the end cap needs to be electrically connected to the tab so that the end cap serves as the output pole (positive output pole or negative output pole) of the battery cell. However, after actual assembly, it is easy for the end cap and the tab to fail to make good contact, resulting in the battery cell being unable to be used normally. Based on this, the embodiments of the present disclosure provide a battery cell and a battery pack to ensure the performance of the battery.

[0044] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the battery cell provided by the embodiment of the present disclosure includes a shell 1 and a battery cell 2, and the number of battery cells 2 can be one, or two or more. Multiple battery cells 2 can be connected in series, in parallel, or in mixed connection to form a whole. The shell 1 has a accommodating cavity and an open opening, and the battery cell 2 is arranged in the accommodating cavity; the battery cell 2 includes an end cap assembly 21, a current collecting component 22 and an electrode assembly 23, and the end cap assembly 21 covers the opening and is sealed and connected to the shell 1; the current collecting component 22 includes a first connecting portion 221 and a second connecting portion 222, the first connecting portion 221 is connected to the first pole ear of the electrode assembly 23, and the first connecting portion 221 is optionally welded to the first pole ear; the second connecting portion 222 is connected to the end cap assembly 21, and the second connecting portion 222 is optionally welded to the end cap assembly 21; wherein the first connecting portion 221 and the second connecting portion 222 are connected by an elastic member 223, so that the first connecting portion 221 is crimped to the first pole ear in a direction away from the end cap assembly 21. The elastic force generated by the elastic member 223 in the embodiment of the present disclosure can cause the first connecting portion 221 to generate pressure toward the first pole ear, so that the first connecting portion 221 always abuts against the first pole ear, thereby reducing the risk of poor contact between the current collecting component 22 and the first pole ear or poor welding due to loose contact between the current collecting component 22 and the pole ear, thereby improving the reliability and safety of the battery.

[0045] The embodiment of the present disclosure realizes a tight connection and electrical connection between the first pole ear and the first connecting portion 221 through the elastic member 223 in the current-exciting component. The first exciting portion abuts against the first pole ear, which can ensure a good flow of current between the current collecting component 22 and the end cover assembly 21, and reduce the risk of failure in the connection between the first pole ear and the current collecting component, thereby reducing the risk of failure in the electrical connection between the battery cell 2 and the shell 1.

[0046] In some specific embodiments, the elastic member 223 includes an elastic arm, one end of which is connected to the first connection portion 221, and the other end of which is connected to the second connection portion 222. The elastic force of the elastic arm can cause the first connection portion 221 to generate pressure toward the first pole tab, so that the first connection portion 221 always abuts against the first pole tab, thereby reducing the risk of poor contact between the current collecting component 22 and the first pole tab or poor welding due to loose contact between the current collecting component 22 and the pole tab, thereby improving the reliability and safety of the battery.

[0047] In some specific embodiments, the elastic arm is arc-shaped along the direction from the first connection portion 221 to the second connection portion 222, and the second connection portion 222 is bent toward the direction close to the electrode assembly 23, which can improve the stability of the connection between the first electrode tab and the first connection portion 221.

[0048] In some specific embodiments, the first connection portion 221 is plate-shaped, and the shape of the first connection portion 221 is consistent with the shape of the cross section of the electrode assembly 23 perpendicular to the height direction Z, so as to facilitate the connection between the first connection portion 221 and the electrode tab. Optionally, when the electrode assembly 23 is cylindrical, the first connection portion 221 is circular.

[0049] In some specific embodiments, the number of the second connection parts 222 and the elastic arms are both multiple, and the multiple second connection parts 222 are arranged at intervals. The multiple second connection parts 222 are centrally symmetrical with respect to the central axis of the end cover assembly 21, and the second connection parts 222 are connected to the elastic arms one by one. The elastic force between each second connection part 222 and the first connection part 221 can be the same or different, and the position where the second connection part 222 is connected to the end cover assembly 21 can be set at different positions as needed to improve the stability of the connection between the first pole ear and the first connection part 221

[0050] In some specific embodiments, the second connection portion 222 is arc-shaped, and a plurality of second connection portions 222 form a ring shape, which can improve the stability of the connection between the first electrode tab and the first connection portion 221 .

[0051] In some specific embodiments, the end cover assembly 21 includes a cover body 211 and a cover plate 212, the cover body 211 is provided with a through hole 2111 extending along the height direction of the cover body 211, and the inner wall of the through hole 2111 is formed with a first step portion 211a and a second step portion 211b; the first step portion 211a includes a first surface, the second connecting portion 222 covers the first surface and is fixedly connected to the first surface, which can improve the stability of the connection between the cover body 211 and the current collecting component 22, optionally, the cover body 211 and the second connecting portion 222 of the current collecting component 22 are connected by welding; the second step portion 211b includes a second surface, the cover plate 212 covers the second surface and is fixedly connected to the second surface, which can improve the stability of the connection between the cover body 211 and the cover plate 212, optionally, the cover plate 212 and the cover body 211 are connected by welding.

[0052] In some specific embodiments, along the height direction Z of the end cover assembly 21, the first surface is located at the top of the first step portion 211a. Preferably, the first surface is a plane, and the second connection portion 222 is in contact with the first surface. On the one hand, it facilitates welding of the second connection portion 222 and the first step portion 211a, and on the other hand, it increases the base area of ​​the second connection portion 222 and the cover body 211, thereby improving the stability of the connection between the second connection portion 222 and the cover body 211.

[0053] In some specific embodiments, along the height direction Z of the end cover assembly 21, the second surface is located at the top of the second step portion 211b. Preferably, the second surface is a plane, and the cover body 211 is fitted with the second surface. On the one hand, it is convenient for welding the cover plate 212 and the cover body 211, and on the other hand, it increases the contact area between the cover plate 212 and the cover body 211, thereby improving the stability of the connection between the cover plate 212 and the cover body 211.

[0054] In some specific embodiments, a card slot is provided on the outer wall of the cover body 211, and an insulating member 5 is provided in the card slot. The insulating member 5 can be set on the cover body 211 by riveting. The insulating member 5 is provided with a card slot, and the end of the shell 1 is set in the card slot, so that the shell 1 and the cover body 211 are insulated, thereby improving the safety of the battery.

[0055] Optionally, the negative terminal of the battery cell 2 and the shell 1 are welded to form a flow guide channel so that the shell 1 is negatively charged, and the positive electrode of the battery is sealed by welding the shell 1 using an end cover assembly 21. The cover body 211 of the end cover assembly 21 adopts a ring design to perform an insulated and sealed connection through riveting. The positive electrode is insulated from the shell 1 through the circular end cover assembly 21 with an insulating member 5. The welding surface (first surface) of the current collecting component 22 and the sealing welding surface (second surface) of the cover plate 212 are designed on the cover body 211. After the special-shaped current collecting component 22 is welded to the positive terminal of the battery cell 2, the special-shaped current collecting component 22 is welded to the circular sealed end cover assembly 21, and the cover plate 212 of each battery cell 2 is sealed and welded to the circular sealed isolation cover body 211, so as to realize the parallel combination of multiple battery cells 2 of the battery cell to achieve the purpose of increasing the capacity.

[0056] In some specific embodiments, the second electrode tab of the electrode assembly 23 is connected to the cover, and the cover is connected to the shell 1. The cover may have the same structure as the end cap assembly 21, or may be different, and the connection method between the cover and the shell 1 may be the same as the connection method between the end cap assembly 21 and the shell 1, or may be different.

[0057] The polarity of the first pole ear is opposite to that of the second pole ear. The first pole ear and the second pole ear can be arranged at both ends of the electrode assembly 23. One of the first pole ear and the second pole ear is a positive pole ear, and the other is a negative pole ear. The end cover assembly 21, the cover body and the shell 1 together form a sealed space for accommodating the electrode assembly 23 and the electrolyte. The electrolyte can be an electrolyte.

[0058] In a conventional battery cell, a single battery cell is composed of a current collecting component 22 and a winding core. However, when high-capacity applications are required, multiple battery cells are required to be connected in series and in parallel and to form a battery module through a module shape bracket. There are many structural parts and welding is complicated. The structural parts and the module shape bracket will occupy the space for calculating the energy of the battery module, resulting in a reduction in the number of combinations of single batteries within the battery installation space.

[0059] In the disclosed embodiment, a plurality of winding cores can be placed in the shell 1 for parallel combination according to the designed battery energy requirements. The combined battery cells meet the high-capacity application requirements. The end caps are sealed by laser welding, and the end caps have reserved positive terminal welding positions.

[0060] In some specific implementations, the housing 1 is provided with a plurality of openings, and the battery cells 2 correspond to the openings one by one.

[0061] The battery cell is a multi-cell 2 combination structure, which increases the battery capacity, reduces the welding process in the combination design, and reduces the risk of poor welding; the battery cell has less external guide structure design, which reduces the internal guide resistance. Under the same current / time conditions, the heat calculated according to Q=IRt is small, which improves the battery cycle life; the battery cell multi-cell 2 combination reduces the occupied space of the external bracket of a single battery combination, increases the number of battery cells used in a fixed space, and optimizes space utilization.

[0062] In some specific embodiments, the shell 1 is provided with a first liquid injection hole, the first liquid injection hole is connected to a first liquid infusion tube 3, the first liquid infusion tube 3 is made of a material that can be hot-melt or hot-glue sealed, and the end of the first liquid infusion tube 3 away from the first liquid injection hole is sealed; in some specific embodiments, the shell 1 is provided with a second liquid injection hole, the second liquid injection hole is connected to a second liquid infusion tube 4, the second liquid infusion tube 4 is made of a material that can be hot-melt or hot-glue sealed, and the end of the second liquid infusion tube 4 away from the second liquid injection hole is sealed.

[0063] The first refilling tube 3 and the second refilling tube 4 can both be made of plastic tubes or plastic pipes. The negative terminal is refilled through the positive pressure refilling hole, and the positive terminal is pumped out under negative pressure to meet the refilling requirements. The length of the plastic tube can be designed according to the needs of multiple refills, and the plastic tube port can be hot-melt or hot-glue sealed. When the battery needs to be refilled, the sealed end of the plastic tube is removed according to the control distance for refilling. After the refilling is completed, the plastic tube is hot-melt or hot-glue sealed; the battery monomer is designed with the first refilling tube 3 and the second refilling tube 4 structure to provide the battery monomer with secondary refilling, which can increase the service life of the battery monomer.

[0064] In summary, this embodiment has the following effects:

[0065] 1. The battery monomer adopts a multi-core parallel structure design to increase the battery capacity;

[0066] 2. The battery cell is designed with a refilling pipe structure to provide secondary refilling to the battery cell, thereby increasing the service life of the battery cell and saving battery costs.

[0067] 3. The battery monomer and multi-cell 2 combination reduces the space occupied by the external bracket of a single battery combination, increases the number of batteries used in a fixed space, and optimizes space utilization.

[0068] The battery pack provided in the embodiment of the present disclosure includes the battery cell provided in the embodiment of the present disclosure. Since the battery pack provided in the embodiment of the present disclosure has the same advantages as the battery cell provided in the embodiment of the present disclosure, they will not be described in detail here.

[0069] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0071] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A battery cell, characterized in that: include: Casing (1) and battery cell (2): The housing (1) has a containing cavity and an open opening, and the battery core (2) is arranged in the containing cavity; The battery cell (2) comprises an end cover assembly (21), a current collecting component (22) and an electrode assembly (23); the end cover assembly (21) covers the opening and is sealed and connected to the housing (1); The current collecting component (22) comprises a first connecting portion (221) and a second connecting portion (222), wherein the first connecting portion (221) is connected to a first electrode tab of the electrode assembly (23), and the second connecting portion (222) is connected to the end cap assembly (21); The first connecting portion (221) and the second connecting portion (222) are connected via an elastic member (223) so that the first connecting portion (221) is crimped onto the first pole lug in a direction away from the end cover assembly (21).

2. The battery cell according to claim 1, characterized in that: The elastic member (223) comprises an elastic arm, one end of the elastic arm is connected to the first connecting portion (221), and the other end of the elastic arm is connected to the second connecting portion (222).

3. The battery cell according to claim 2, characterized in that: Along the direction from the first connection portion (221) to the second connection portion (222), the elastic arm is arc-shaped, and the second connection portion (222) is bent in a direction close to the electrode assembly (23); And / or, the first connecting portion (221) is plate-shaped, and the shape of the first connecting portion (221) is consistent with the shape of a cross section of the electrode assembly (23) perpendicular to the height direction (Z); And / or, the number of the second connecting parts (222) and the number of the elastic arms are both multiple, the multiple second connecting parts (222) are arranged at intervals, the multiple second connecting parts (222) are centrally symmetrical with respect to the central axis of the end cover assembly (21), and the second connecting parts (222) are connected to the elastic arms in a one-to-one correspondence.

4. The battery cell according to claim 3, characterized in that: The second connection portion (222) is in an arc shape, and a plurality of the second connection portions (222) form a ring shape.

5. The battery cell according to claim 1, characterized in that: The end cover assembly (21) comprises a cover body (211) and a cover plate (212); the cover body (211) is provided with a through hole (2111) extending along a height direction (Z) of the cover body (211); an inner wall of the through hole (2111) is formed with a first step portion (211a) and a second step portion (211b); The first step portion (211a) comprises a first surface, and the second connection portion (222) covers the first surface and is fixedly connected to the first surface; The second step portion (211b) comprises a second surface, and the cover plate (212) covers the second surface and is fixedly connected to the second surface.

6. The battery cell according to claim 5, characterized in that: Along the height direction (Z) of the end cover assembly (21), the first surface is located at the top of the first step portion (211a); And / or, along the height direction (Z) of the end cover assembly (21), the second surface is located at the top of the second step portion (211b).

7. The battery cell according to claim 5, characterized in that: The outer wall of the cover body (211) is provided with a slot, an insulating member (5) is provided in the slot, the insulating member (5) is provided with a slot, and the end of the shell (1) is arranged in the slot.

8. The battery cell according to claim 1, characterized in that: The number of the battery cells (2) is plural, the shell (1) is provided with a plurality of openings, and the battery cells (2) correspond to the openings one by one.

9. The battery cell according to claim 1, characterized in that: The shell (1) is provided with a first liquid injection hole, the first liquid injection hole is connected to a first liquid replenishment tube (3), the first liquid replenishment tube (3) is made of a material that can be hot-melt or hot-glue sealed, and the end of the first liquid replenishment tube (3) away from the first liquid injection hole is sealed; And / or, the shell (1) is provided with a second liquid injection hole, the second liquid injection hole is connected to a second liquid replenishment tube (4), the second liquid replenishment tube (4) is made of a material that can be hot-melt or hot-glue sealed, and the end of the second liquid replenishment tube (4) away from the second liquid injection hole is sealed.

10. A battery pack, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 9.

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