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, which is provided with a cavity and an opening communicated with the cavity; the side end cover is arranged on the opening in a covering manner; the pole is arranged on the side end cover; the electrode assembly is arranged in the cavity, and the electrode assembly comprises a pole piece and a diaphragm which are arranged in a stacked mode; and the UV adhesive layer is arranged in the thickness direction of the electrode assembly so as to fix the pole piece and the diaphragm, improve the bonding force between the pole piece and the diaphragm, and avoid the change of the phase difference of the pole piece caused by the displacement of the pole piece, thereby improving the cycle performance and safety of the battery monomer. After the electrode assembly and the shell are assembled, the electrode assembly is arranged in the cavity of the shell, and the UV adhesive layer can support the top surface and the bottom surface of the electrode assembly, so that the stress area of the electrode assembly is increased, the electrode assembly on the non-tab side is prevented from inclining due to the gravity of the electrode assembly, the performance of the battery monomer is further improved, and the tearing risk of the tab is reduced.

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] A battery cell consists of an electrode assembly and adhesive tape. The electrode assembly includes stacked electrodes and a separator. The adhesive tape is placed on the electrode assembly to secure the electrode assembly. As the electrolyte soaks in, the stacked battery cell will experience the following problems:

[0003] The adhesion between the diaphragm and the electrode becomes weaker. Specifically, when the battery cell is placed on its side, if the weight of the electrode is greater than the adhesion between the diaphragm and the electrode, the electrode will move downward, resulting in a change in the electrode phase difference, which may increase the risk of lithium deposition at the electrode edge. The electrode phase difference refers to the potential difference or voltage difference between the electrode pieces in the battery cell. Changes in the electrode phase difference can affect the cycle performance and safety of the battery cell.

[0004] The tape used to secure the electrode assembly becomes loose or falls off. Specifically, electrolyte immersion can cause the tape to loosen, losing its grip on the stacked cores. This can also cause the electrode phase difference to change. Loose tape can cause the electrode inside the cell to shift or misalign, impacting the cycling performance and safety of the battery cells. Utility Model Content

[0005] The purpose of the present utility model is to provide a battery cell and a battery pack to solve the technical problems of poor adhesion between the diaphragm and the electrode sheet and loosening or falling off of the tape used to fix the electrode assembly.

[0006] On the one hand, the present application provides a battery cell, comprising: a shell having a cavity and an opening connected to the cavity; a side end cover, the cover being arranged on the opening; a pole, arranged on the side end cover; an electrode assembly, arranged in the cavity, the electrode assembly comprising stacked pole pieces and a diaphragm; and a UV glue layer, arranged in the thickness direction of the electrode assembly to fix the pole pieces and the diaphragm.

[0007] In some embodiments, the electrode assembly has a top surface and a bottom surface relatively disposed; the UV adhesive layer includes a first UV adhesive layer and a second UV adhesive layer, the first UV adhesive layer is disposed on the top surface of the electrode assembly; the second UV adhesive layer is disposed on the bottom surface of the electrode assembly.

[0008] In some embodiments, the electrode assembly has a first end face and a second end face arranged opposite to each other; the first UV adhesive layer includes two first UV adhesive blocks, one of the two first UV adhesive blocks is arranged close to the first end face, and the other is arranged close to the second end face; the second UV adhesive layer includes two second UV adhesive blocks, one of the two second UV adhesive blocks is arranged close to the first end face, and the other is arranged close to the second end face.

[0009] In some embodiments, the battery cell further includes: a first tape disposed on the top surface of the electrode assembly, and the first tape is disposed adjacent to the first UV glue block; and a second tape disposed on the bottom surface of the electrode assembly, and the second tape is disposed adjacent to the second UV glue block.

[0010] In some embodiments, the battery cell further includes: a first tape disposed on the top surface of the electrode assembly; a second tape disposed on the bottom surface of the electrode assembly; the first tape includes a plurality of first tape blocks, and the second tape includes a plurality of second tape blocks; the first UV glue layer includes a plurality of first UV glue blocks, and the second UV glue layer includes a plurality of second UV glue blocks; wherein, the first UV glue blocks are spaced apart from the first tape blocks, and the second UV glue blocks are spaced apart from the second tape blocks.

[0011] In some embodiments, the battery cell further includes: a first tape disposed on the top surface of the electrode assembly, and the first UV glue layer covers the first tape; a second tape disposed on the bottom surface of the electrode assembly, and the second UV glue layer covers the second tape.

[0012] In some embodiments, the housing has a relatively arranged inner top surface and an inner bottom surface, the first UV glue layer is disposed between the inner top surface of the housing and the top surface of the electrode assembly, and the second UV glue layer is disposed between the inner bottom surface of the housing and the bottom surface of the electrode assembly.

[0013] In some embodiments, the thickness of the first UV glue layer increases in a direction away from the pole post; the thickness of the second UV glue layer increases in a direction away from the pole post.

[0014] In some embodiments, the electrode tab includes a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab are stacked, and a separator is disposed between the positive electrode tab and the negative electrode tab.

[0015] On the other hand, a battery pack is further provided, including at least two battery cells, and the at least two battery cells are connected in series and in parallel.

[0016] The technical effect of the present application is that the UV glue layer is disposed in the thickness direction of the electrode assembly to fix the electrode tab and the separator, improve the bonding force between the electrode tab and the separator, avoid the change of the electrode tab phase difference caused by the displacement of the electrode tab, thereby improving the cycle performance and safety of the battery cell. After the electrode assembly and the housing are assembled, the electrode assembly is disposed in the cavity of the housing, and the UV glue layer can support the top surface and the bottom surface of the electrode assembly to increase the stress area of the electrode assembly, avoid the inclination of the electrode assembly on the non-tab side due to its own gravity, and further improve the performance of the battery cell and reduce the risk of tearing of the tab. Description of the Drawings

[0017] 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.

[0018] Figure 1 A schematic structural diagram of a battery cell provided in an embodiment of the present application.

[0019] Figure 2 A schematic structural diagram of the housing provided in an embodiment of the present application.

[0020] Figure 3 A schematic structural diagram of the electrode assembly provided in an embodiment of the present application.

[0021] Figure 4 for Figure 3 Cross-section along the AA direction.

[0022] Figure 5a This is a schematic structural diagram of the UV adhesive layer provided in an embodiment of the present application being arranged on the electrode assembly in the thickness direction, which mainly reflects the structure in which the adhesive tape and the UV adhesive layer are arranged adjacent to each other.

[0023] Figure 5b for Figure 5a Top view of .

[0024] Figure 5c for Figure 5a Bottom view of .

[0025] Figure 6a This is a schematic structural diagram of the UV adhesive layer provided in an embodiment of the present application being arranged on the electrode assembly in the thickness direction, which mainly reflects the structure in which the tape block and the UV adhesive block are arranged at intervals.

[0026] Figure 6b for Figure 6a Top view of .

[0027] Figure 6c for Figure 6a Bottom view of .

[0028] Figure 7a This is a schematic structural diagram of an embodiment of the present application in which the entire UV adhesive layer is disposed on the electrode assembly in the thickness direction.

[0029] Figure 7b for Figure 7a Top view of .

[0030] Figure 7c for Figure 7a Bottom view of .

[0031] Figure 8 This is a schematic structural diagram of an embodiment of the present application in which the entire UV adhesive layer is disposed on the electrode assembly in the thickness direction, which mainly reflects a structure in which the thickness of the UV adhesive layer increases away from the pole.

[0032] The identification of the components in the attached drawings is as follows:

[0033] 11 Housing; 111 Housing main body; 112 Side end plate; 12 Side end cover; 10 Cavity; 20 Opening; 101 Inner top surface; 102 Inner bottom surface;

[0034] 2 Terminal posts; 21 Positive terminal post; 22 Negative terminal post;

[0035] 3 Electrode assembly; 31 Positive electrode sheet; 32 Negative electrode sheet; 33 Diaphragm; 34 Positive electrode tab; 35 Negative electrode tab; 301 Top surface; 302 Bottom surface; 304 First end face; 305 Second end face;

[0036] 4 UV glue layer; 41 First UV glue layer; 42 Second UV glue layer; 411 First UV glue block; 421 Second UV glue block;

[0037] 51 First tape; 511 First tape block; 52 Second tape; 521 Second tape block. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0039] In the description of the present application, 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", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0040] In the description of the present application, it should be noted that unless otherwise clearly specified or limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection or a communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0041] In the present application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include that the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0042] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application.

[0043] To solve the technical problems of the poor adhesion between the separator and the electrode plate and the loosening or falling off of the tape for fixing the electrode assembly. The present application provides a battery cell, which is a side-standing battery cell, including a housing, a side end cover, a terminal, an electrode assembly and a UV glue layer. The housing has a cavity and an opening communicating with the cavity. The side end cover is disposed in the opening. The terminal is disposed on the side end cover. The electrode assembly is disposed in the cavity, and the electrode assembly includes a stacked electrode plate and a separator. The UV glue layer is disposed in the thickness direction of the electrode assembly to fix the electrode plate and the separator, improve the adhesion between the electrode plate and the separator, and avoid the change of the phase difference of the electrode plate, thereby improving the cycle performance and safety of the battery cell. The present application coats a liquid UV glue on at least one surface in the thickness direction of the electrode assembly, and the liquid UV glue is quickly cured by ultraviolet light (UV) irradiation to form a solid UV glue layer, so that the process time can be saved. The following will be described in detail.

[0044] As Figure 1As shown in the figure, an embodiment of the present application provides a battery cell, which has an intersecting first direction X, second direction Y, and third direction. The first direction X is the length direction of the battery cell, the second direction Y is the height direction of the battery cell, that is, the height direction of the electrode assembly 3, and the third direction (not shown in the figure) is the direction perpendicular to the first direction X and the second direction Y, that is, the width direction of the battery cell, that is, the thickness direction (stacking direction) of the electrode assembly 3.

[0045] As Figure 1 shown, the battery cell includes a housing 11, a side end cover 12, a pole post 2, an electrode assembly 3, and a UV glue layer 4.

[0046] As Figure 2 shown, the housing 11 has a cavity 10 and an opening 20 communicating with the cavity 10. The housing 11 can be a square columnar structure and is placed along the first direction, that is, the length direction of the housing 11 is parallel to the horizontal direction.

[0047] As Figure 1 shown, the side end cover 12 is disposed on the opening 20, and the pole post 2 is disposed on the side end cover 12. The side end cover 12 can be inclinedly installed in the opening 20. The side end cover 12 can be provided with an explosion-proof hole, a liquid injection hole, a pole post 2 hole, etc., so that components such as the pole post 2 and the explosion-proof valve can be installed on the side end cover 12. The pole post 2 can include a positive pole post 21 and a negative pole post 22, and both are disposed on the side end cover 12.

[0048] As Figure 1 and Figure 2 shown, in one embodiment, the housing can include a housing main body 111 and a side end plate 112. One end of the housing main body 111 in its length direction is an opening for installing the side end cover 12, and the other end is an opening for installing the side end plate 112.

[0049] As Figure 1 , Figure 3 and Figure 4 shown, the electrode assembly 3 is disposed in the cavity 10. The electrode assembly 3 includes stacked electrode plates and a separator 33. The electrode plates include a positive electrode plate 31, a negative electrode plate 32, a positive electrode tab 34, and a negative electrode tab 35. The positive electrode plate 31 and the negative electrode plate 32 are stacked, and the separator 33 is disposed between the adjacent positive electrode plate 31 and negative electrode plate 32. The positive electrode tab 34 is connected to the positive electrode plate 31 in the first direction X, and the negative electrode tab 35 is connected to the negative electrode plate 32 in the first direction X.

[0050] Multiple positive electrode tabs 34 are stacked in the third direction to form a positive electrode tab group, and multiple negative electrode tabs 35 are stacked in the third direction to form a negative electrode tab group. The positive electrode tab group and the negative electrode tab group are spaced apart, and the positive electrode tab group is connected to the positive pole post 21, and the negative electrode tab group is connected to the negative pole post 22.

[0051] In the electrode assembly 3, each positive electrode plate 31 and the positive electrode tab 34 can be an integrally formed structure, and each negative electrode plate 32 and the negative electrode tab 35 can be an integrally formed structure to improve the assembly efficiency of the battery cell.

[0052] The UV glue layer 4 is disposed in the thickness direction of the electrode assembly 3 to fix the electrode plate and the separator 33, improve the adhesion between the electrode plate and the separator 33, avoid the change of the phase difference of the electrode plate, thereby improving the cycle performance and safety of the battery cell. After the electrode assembly 3 is assembled with the housing 11, the electrode assembly 3 is disposed in the cavity 10 of the housing 11. The UV glue layer can support the top surface 301 and the bottom surface 302 of the electrode assembly 3 to increase the stress area of the electrode assembly 3 and avoid the electrode assembly 3 on the non-tab side from tilting due to its own gravity, so as to further improve the performance of the battery cell and reduce the risk of tab tearing.

[0053] It should be noted that too large or unstable change in the phase difference of the electrode plate may lead to a decrease in the performance of the battery cell or safety problems. For example, too large a change in the phase difference of the electrode plate may lead to problems such as capacity attenuation, increased internal resistance, and reduced cycle life of the battery cell. In addition, unstable phase difference of the electrode plate may lead to overcharge or over-discharge of the battery cell, and then cause safety risks such as overheating, short circuit, and even explosion of the battery cell.

[0054] As Figure 1 and Figure 3 shown, in an embodiment, the electrode assembly 3 has a top surface 301 and a bottom surface 302 which are oppositely arranged. The UV glue layer includes a first UV glue layer 41 and a second UV glue layer 42. The first UV glue layer 41 is disposed on the top surface 301 of the electrode assembly 3; the second UV glue layer 42 is disposed on the bottom surface 302 of the electrode assembly 3. Therefore, by coating liquid UV glue on the top surface 301 and the bottom surface 302 in the thickness direction of the electrode assembly 3, the liquid UV glue flows between the electrode plate and the separator 33, and the liquid UV glue is cured under ultraviolet light (UV) irradiation to form a solid UV glue layer to fix the electrode plate and the separator 33 on the side of the electrode assembly 3, avoiding the phenomenon that the gravity of the electrode plate is greater than the adhesion between the separator 33 and the electrode plate, thereby improving the cycle performance and safety of the battery cell.

[0055] As Figure 3 shown, in an embodiment, the electrode assembly 3 has a first end face 304 and a second end face 305 which are oppositely arranged. The first end face 304 is the end face on the tab side, and the second end face 305 is the end face on the non-tab side.

[0056] As Figures 5a to 5cAs shown, the first UV glue layer 41 includes two first UV glue blocks 411. One of the two first UV glue blocks 411 is disposed near the first end face 304, and the other is disposed near the second end face 305. The second UV glue layer 42 includes two second UV glue blocks 421. One of the two second UV glue blocks 421 is disposed near the first end face 304, and the other is disposed near the second end face 305.

[0057] As Figures 5a to 5c shown, the battery cell further includes a first tape 51 and a second tape 52. The first tape 51 is disposed on the top face 301 of the electrode assembly 3, and the first tape 51 is disposed adjacent to the first UV glue block 411. Wherein, the first tape 51 may include at least two tape blocks, and the two first UV glue blocks 411 are disposed between the two tape blocks, or at least two tape blocks are located between the two first UV glue blocks 411. In other embodiments, the first tape 51 may also be disposed entirely between the two first UV glue blocks 411. The second tape 52 is disposed on the bottom face 302 of the electrode assembly 3, and the second tape 52 is disposed adjacent to the second UV glue block 411. Wherein, the second tape 52 may include at least two tape blocks, and the at least two tape blocks are spaced between the two second UV glue blocks 421. In other embodiments, the second tape 52 may also be disposed entirely between the two second UV glue blocks 421.

[0058] During the preparation of the battery cell, first, the positive electrode sheet, the negative electrode sheet, and the separator are stacked in the order of positive electrode sheet, separator, negative electrode sheet, separator, positive electrode sheet... Then, tape regions are respectively defined on both sides in the thickness direction of the electrode assembly, and a part of the region is reserved near the two end faces of the first end face and the second end face as the UV glue region. Tapes are pasted in the tape regions to fix the positive electrode sheet, the negative electrode sheet, and the separator once. Liquid UV glue is coated in the UV glue region. Under the action of flow, the liquid UV glue will flow into the gaps between the positive electrode sheet and the separator and between the negative electrode sheet and the separator, and the UV glue is cured by ultraviolet light (UV) irradiation, forming a first UV glue layer on one side in the thickness direction of the electrode assembly and a second UV glue layer on the other side in the thickness direction of the electrode assembly, so as to fix the positive electrode sheet, the negative electrode sheet, and the separator a second time, improve the adhesion between the electrode sheets and the separator, avoid the change of the electrode sheet phase difference, and thus improve the cycle performance and safety of the battery cell.

[0059] In the embodiments of the present application, the pole piece and the separator are fixed twice through two bonding methods of tape and UV glue. Therefore, with the immersion of the electrolyte, although the tape may become loose or fall off, due to the presence of the UV glue layer, the bonding force between the separator and the pole piece will not be affected, so that the phase difference of the pole piece will not change, ensuring the cycling performance and safety of the battery cell.

[0060] As Figure 1 and Figure 2 shown, in one embodiment, the housing 11 has an inner top surface 101 and an inner bottom surface 102 arranged oppositely. The first UV glue layer is disposed between the inner top surface 101 of the housing 11 and the top surface 301 of the electrode assembly 3, and the second UV glue layer 42 is disposed between the inner bottom surface 102 of the housing 11 and the bottom surface 302 of the electrode assembly 3. After the electrode assembly 3 and the housing 11 are assembled, the first UV glue layer can support the top surface 301 of the electrode assembly 3, and the second UV glue layer 42 can support the bottom surface 302 of the electrode assembly 3, so as to increase the stress area of the electrode assembly 3, thereby avoiding the inclination of the electrode assembly 3 on the non-tab side due to its own gravity, while improving the performance of the battery cell and reducing the risk of tab tearing.

[0061] As Figures 6a to 6c shown, in one embodiment, the first tape 51 includes a plurality of first tape blocks 511, and the second tape 52 includes a plurality of second tape blocks 521. The first UV glue layer 41 includes a plurality of first UV glue blocks 411, and the second UV glue layer 42 includes a plurality of second UV glue blocks 421. The first UV glue blocks 411 and the first tape blocks 511 are arranged at intervals, and the second UV glue blocks 421 and the second tape blocks 521 are arranged at intervals.

[0062] In the embodiments of the present application, the pole piece and the separator 33 are fixed twice through two bonding methods of tape and UV glue, and more UV glue is coated between the pole piece and the separator � to improve the bonding force between the pole piece and the separator. Therefore, with the immersion of the electrolyte, although the tape may become loose or fall off, due to the presence of the UV glue layer, the bonding force between the separator and the pole piece will not be affected, so that the phase difference of the pole piece will not change, ensuring the cycling performance and safety of the battery cell.

[0063] During the preparation of the battery cell, first, the positive electrode sheet, the negative electrode sheet, and the separator are stacked in the order of positive electrode sheet, separator, negative electrode sheet, separator, positive electrode sheet... Then, tape regions and UV glue regions arranged at intervals are respectively defined on both sides in the thickness direction of the electrode assembly.

[0064] Paste the first tape block on the tape area on one side in the thickness direction of the electrode assembly, and coat the UV glue area with liquid UV glue to form the first UV glue block. Paste the second tape block on the tape area on the other side in the thickness direction of the electrode assembly to form the second UV glue block. The first tape block and the second tape block are used for primary fixation of the positive electrode sheet, the negative electrode sheet and the separator. When the electrode assembly is under the flow of the liquid UV glue, the glue will flow into the gaps between the positive electrode sheet and the separator and between the negative electrode sheet and the separator, and the UV glue is cured by ultraviolet light (UV) irradiation. A plurality of first UV glue blocks arranged at intervals are formed on one side in the thickness direction of the electrode assembly, that is, the first UV glue layer, and a plurality of second UV glue layers arranged at intervals are formed on the other side in the thickness direction of the electrode assembly, that is, the second UV glue layer. The first UV glue layer and the second UV glue layer are used for secondary fixation of the positive electrode sheet, the negative electrode sheet and the separator to improve the adhesion between the electrode sheets and the separator, avoid changes in the phase difference of the electrode sheets, and thus improve the cycling performance and safety of the battery cell.

[0065] As Figures 7a to 7c shown, in one embodiment, the battery cell further includes a first tape 51 and a second tape 52. The first tape 51 is disposed on the top surface 301 of the electrode assembly 3, and the first UV glue layer covers the first tape 51. The second tape 52 is disposed on the bottom surface 302 of the electrode assembly 3, and the second UV glue layer covers the second tape 52.

[0066] In the embodiment of the present application, the electrode sheets and the separator 33 are fixed twice by two bonding methods of tape and UV glue, and the UV glue is coated on the entire surface on both sides in the thickness direction of the electrode assembly. In this way, while improving the adhesion between the electrode sheets and the separator 33, it is also possible to save the process time without separately defining the coating area of the UV glue.

[0067] During the preparation of the battery cell, first, the positive electrode sheet, the negative electrode sheet, and the separator are stacked in the order of positive electrode sheet, separator, negative electrode sheet, separator, positive electrode sheet, and so on. Then, tape areas are defined on both sides in the thickness direction of the electrode assembly, and a part of the area near the two end faces, namely the first end face and the second end face, is reserved as the UV glue area. Tape is pasted in the tape area to fix the positive electrode sheet, the negative electrode sheet, and the separator once. Liquid UV glue is coated in the UV glue area and on the tape. Under the action of flow, the liquid UV glue will flow into the gaps between the positive electrode sheet and the separator and between the negative electrode sheet and the separator, and the UV glue is cured by ultraviolet light (UV) irradiation. A first UV glue layer is formed on one side in the thickness direction of the electrode assembly, and a second UV glue layer is formed on the other side in the thickness direction of the electrode assembly, so as to fix the positive electrode sheet, the negative electrode sheet, and the separator for the second time, improve the adhesion between the electrode sheet and the separator, avoid the change of the electrode sheet phase difference, and thus improve the cycle performance and safety of the battery cell.

[0068] As Figure 8 shown, in one embodiment, the thickness of the first UV glue layer 41 increases in the direction away from the pole column 2. The thickness of the second UV glue layer 42 increases in the direction away from the pole column 2. Therefore, after the electrode assembly 3 and the housing 11 are assembled, the first UV glue layer 41 on the side away from the pole ear can support the top surface 301 of the electrode assembly 3, and the second UV glue layer 42 on the side away from the pole ear can support the bottom surface 302 of the electrode assembly 3, so as to prevent the electrode assembly 3 on the non-pole ear side from tilting due to its own gravity, while improving the performance of the battery cell, and reducing the risk of pole ear tearing.

[0069] The embodiment of the present application also provides a battery pack, which includes at least two battery cells, and the at least two battery cells are connected in series and parallel. The battery pack can be a battery module, a battery pack, or a battery cluster. All the battery cells of the battery pack can be connected in series, or can be connected in parallel. Of course, a part of the battery cells of the battery pack can be connected in series, and the other part can be connected in parallel. There is no special limitation here, and it can be specifically set according to needs. In this battery pack, the UV glue layer is arranged in the thickness direction of the electrode assembly to fix the electrode sheet and the separator, improve the adhesion between the electrode sheet and the separator, avoid the change of the electrode sheet phase difference, and thus improve the cycle performance and safety of the battery cell. After the electrode assembly and the housing are assembled, the electrode assembly is arranged in the cavity of the housing, and the UV glue layer can support the top surface and the bottom surface of the electrode assembly to increase the stress area of the electrode assembly, prevent the electrode assembly on the non-pole ear side from tilting due to its own gravity, and further improve the performance of the battery cell and reduce the risk of pole ear tearing.

[0070] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0071] The above has introduced in detail a battery cell and a battery pack provided by an embodiment of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a cavity and an opening communicating with the cavity; A side end cover disposed on the opening; A terminal post disposed on the side end cover; An electrode assembly disposed in the cavity, the electrode assembly including stacked electrode plates and separators; And A UV glue layer disposed in the thickness direction of the electrode assembly to fix the electrode plates and the separators.

2. The battery cell according to claim 1, wherein The electrode assembly has a top surface and a bottom surface disposed opposite to each other; The UV glue layer includes a first UV glue layer and a second UV glue layer, the first UV glue layer being disposed on the top surface of the electrode assembly; The second UV glue layer is disposed on the bottom surface of the electrode assembly.

3. The battery cell according to claim 2, wherein The electrode assembly has a first end face and a second end face disposed opposite to each other; The first UV glue layer includes two first UV glue blocks, one of the two first UV glue blocks being disposed near the first end face and the other being disposed near the second end face; The second UV glue layer includes two second UV glue blocks, one of the two second UV glue blocks being disposed near the first end face and the other being disposed near the second end face.

4. The battery cell according to claim 3, wherein, Further comprising: A first tape disposed on the top surface of the electrode assembly, and the first tape is disposed adjacent to the first UV glue block; And A second tape disposed on the bottom surface of the electrode assembly, and the second tape is disposed adjacent to the second UV glue block.

5. The battery cell according to claim 2, wherein Further comprising: A first tape disposed on the top surface of the electrode assembly; A second tape disposed on the bottom surface of the electrode assembly; The first tape includes a plurality of first tape blocks, the second tape includes a plurality of second tape blocks; the first UV glue layer includes a plurality of first UV glue blocks, and the second UV glue layer includes a plurality of second UV glue blocks; wherein, the first UV glue blocks and the first tape blocks are spaced apart, and the second UV glue blocks and the second tape blocks are spaced apart.

6. The battery cell according to claim 2, wherein, Further comprising: A first tape disposed on the top surface of the electrode assembly, and the first UV glue layer covers the first tape; A second tape disposed on the bottom surface of the electrode assembly, and the second UV glue layer covers the second tape.

7. The battery cell according to claim 2, wherein The housing has an inner top surface and an inner bottom surface disposed opposite to each other, the first UV glue layer is disposed between the inner top surface of the housing and the top surface of the electrode assembly, and the second UV glue layer is disposed between the inner bottom surface of the housing and the bottom surface of the electrode assembly.

8. The battery cell according to claim 7, wherein The thickness of the first UV glue layer increases in a direction away from the terminal post; The thickness of the second UV glue layer increases in a direction away from the terminal post.

9. The battery cell according to claim 1, wherein The electrode plates include a positive electrode plate and a negative electrode plate, the positive electrode plate and the negative electrode plate are stacked, and the separator is disposed between the positive electrode plate and the negative electrode plate.

10. A battery pack, wherein Comprising at least two battery cells as described in any one of claims 1 to 9, and the at least two battery cells are connected in series and / or in parallel.

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