A single cell and a battery pack

Abstract

The application provides a single battery and a battery pack, and belongs to the technical field of batteries. The single battery has a first direction, a second direction and a third direction perpendicular to each other. The single battery comprises a shell, an electrode assembly and an adhesive member. The shell comprises a top cover and a bottom wall arranged opposite along the first direction. The electrode assembly is arranged in the shell and located between the top cover and the bottom wall. The side of the bottom wall away from the electrode assembly along the first direction is provided with a clearance slot extending along the third direction. The width of the clearance slot along the second direction decreases from the side close to the electrode assembly to the side away from the electrode assembly. At least a part of the adhesive member is located in the clearance slot. The single battery provided by the application can connect the shell and the external supporting plate through the adhesive member outside the clearance slot by arranging at least one clearance slot on the side of the bottom wall away from the top cover and arranging at least a part of the adhesive member in the clearance slot, so as to improve the stability and convenience of the connection between the single battery and the external supporting plate.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0002] Battery packs are widely used as power supply units in equipment such as new energy vehicles and mobile base stations. A battery pack includes a housing and at least one battery module housed within the housing. Each battery module includes a tray and multiple individual batteries mounted on the tray. The tray has a pressure relief vent, and each individual battery has an explosion-proof device at its bottom for pressure relief protection, positioned opposite the pressure relief vent. When a single battery is depressurized, the internal pressure rises sharply, forcing the explosion-proof device to open and allowing the gas and electrolyte to escape through the pressure relief vent.

[0003] In related technologies, when assembling battery modules, structural adhesive needs to be applied to the bottom area of ​​individual cells to bond and fix adjacent individual cells and individual cells to the tray. However, due to manufacturing errors in the length of individual cells and the flatness of the tray, when all individual cells are installed with their tops aligned, the bonding effect between the bottom of some individual cells and the tray is not good. Utility Model Content

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a single cell battery and a battery pack.

[0005] In a first aspect, this application provides a single-cell battery having a first direction, a second direction, and a third direction that are perpendicular to each other, including: The housing includes a top cover and a bottom wall disposed opposite to each other along the first direction; An electrode assembly is disposed in the housing, the electrode assembly being located between the top cover and the bottom wall; the bottom wall is provided with a relief groove on the side away from the electrode assembly along the first direction, the relief groove is recessed towards the electrode assembly along the first direction, the relief groove extends along the third direction, and the width of the relief groove along the second direction decreases from the direction near the electrode assembly to the direction away from the electrode assembly. An adhesive element, at least a portion of which is located in the relief groove.

[0006] In some embodiments, the clearance groove extends along the second direction, and the width of the clearance groove gradually decreases from the direction closer to the electrode assembly to the direction farther away from the electrode assembly.

[0007] In some embodiments, the bottom wall has a plurality of clearance grooves on the side opposite to the electrode assembly, and the plurality of clearance grooves are arranged at intervals along the second direction.

[0008] In some embodiments, the clearance groove has a first receiving groove and a second receiving groove that are connected to each other, the second receiving groove extending through the bottom wall on the side surface opposite to the top cover along the first direction, and the first receiving groove being disposed on the side of the second receiving groove close to the top cover. Along the second direction, the wall width of the first receiving groove is greater than the wall width of the second receiving groove.

[0009] In some embodiments, along the first direction, the width of the wall of the first receiving groove first increases and then decreases from the side closer to the top cover to the side farther from the top cover.

[0010] In some embodiments, along the first direction, the width of the wall of the first receiving groove is the same from the side closer to the top cover to the side farther from the top cover.

[0011] In some embodiments, along the first direction, the width of the relief groove wall increases and then decreases from the side closer to the top cover to the side farther from the top cover.

[0012] In some embodiments, the bottom wall is provided with a reinforcing rib on the side near the electrode assembly, and the reinforcing rib protrudes in the direction toward the electrode assembly.

[0013] In some embodiments, the bottom wall has multiple corner ends at its edge, and there are multiple reinforcing ribs. One end of each reinforcing rib intersects at the center of the bottom wall, and the other end of each reinforcing rib is connected to the corner end.

[0014] Secondly, this application provides a battery pack including the aforementioned single battery cell.

[0015] The embodiments of this application have the following advantages: by providing at least one relief groove on the side of the bottom wall away from the top cover, and by placing at least a portion of the adhesive in the relief groove and connecting it with the groove wall of the relief groove, thereby limiting the adhesive and ensuring the stability of the adhesive in the relief groove, and by making the adhesive partially protrude from the groove opening along the first direction, the adhesive can be connected to the external mounting plate, thereby bonding the housing to the external mounting plate, thereby improving the stability and convenience of connecting the single battery cell to the external support plate.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This application provides a schematic diagram of the structure of a single-cell battery from one perspective, illustrating some embodiments thereof. Figure 2 This application provides a schematic diagram of the structure of a single-cell battery according to a first embodiment from one perspective. Figure 3 This application provides a schematic diagram of the structure of a single-cell battery according to a second embodiment from one perspective. Figure 4 The diagram shows a third-view structural schematic of a single-cell battery according to some embodiments of this application; Figure 5 The diagram shows a structural schematic from one perspective of a fourth embodiment of a single-cell battery provided by some embodiments of this application; Figure 6 The diagram shows a fifth embodiment of a single-cell battery provided by some embodiments of this application, with a structural schematic diagram from one perspective. Figure 7 This application provides a schematic diagram of the structure of a single-cell battery with the bottom wall facing the top cover from one perspective, based on some embodiments of the present application. Figure 8 This illustration shows a structural schematic diagram of a single-cell battery provided by some embodiments of this application from another perspective.

[0019] Explanation of key component symbols: 100-Housing shell; 110-Top cover; 120-Bottom wall; 121-Relieving groove; 1211-First receiving groove; 1212-Second receiving groove; 122-Corner end; 123-Reinforcing rib; 200-Electrode assembly; 300-Adhesive component.

[0020] Z - First direction; X - Second direction; Y - Third direction. Detailed Implementation

[0021] The embodiments of this application 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 application, and should not be construed as limiting this application.

[0022] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 8 As shown, some embodiments of this application provide a single battery cell having a first direction Z, a second direction X, and a third direction Y that are perpendicular to each other. The single battery cell is mainly provided with at least one clearance groove 121 on the side of the bottom wall 120 away from the top cover 110, and at least a portion of the adhesive 300 is disposed in the clearance groove 121. The housing 100 is then bonded to the external mounting plate by the adhesive 300, thereby improving the stability and convenience of connecting the single battery cell to the external mounting plate.

[0027] The single cell includes a housing 100, an electrode assembly 200, and an adhesive 300.

[0028] The housing 100 includes a top cover 110 and a bottom wall 120 disposed opposite each other along the first direction Z.

[0029] The electrode assembly 200 is disposed in the housing 100 to provide limiting and protection for the electrode assembly 200 through the housing 100, so as to ensure the stability and safety of the electrode assembly 200 within the housing 100.

[0030] The electrode assembly 200 is located between the top cover 110 and the bottom wall 120, so as to limit the electrode assembly 200 along the first direction Z by the top cover 110 and the bottom wall 120.

[0031] Additionally, the bottom wall 120 has a recessed groove 121 on the side away from the electrode assembly 200 along the first direction Z. The recessed groove 121 is recessed towards the electrode assembly 200 along the first direction Z and extends along the third direction Y. The width of the recessed groove 121 along the second direction X decreases from near the electrode assembly 200 to away from the electrode assembly 200, and at least a portion of the adhesive 300 is located within... In the relief groove 121, the adhesive 300 is bonded to the groove wall of the relief groove 121. Since the adhesive 300 seals the groove opening of the relief groove 121, an air pressure difference is formed between the relief groove 121 and the outside of the relief groove 121. The external air pressure exerts a pushing force on the adhesive 300 in the first direction Z towards the electrode assembly 200, thereby further preventing the adhesive 300 from falling out of the relief groove 121 and ensuring the stability of the connection between the adhesive 300 and the groove wall of the relief groove 121.

[0032] Understandably, the adhesive component 300 is exposed outside the relief groove 121 on the side facing away from the electrode assembly 200 along the first direction Z. This portion of the adhesive component 300 outside the relief groove 121 is connected to the side of the bottom wall 120 facing away from the top cover 110 to ensure the stability of the connection between the adhesive component 300 and the housing 100. This portion of the adhesive component 300 outside the relief groove 121 can be bonded to an external mounting plate, thereby fixing the individual battery to the mounting plate and improving the convenience, stability, and assembly efficiency of the assembly between the individual battery and the mounting plate.

[0033] The adhesive component 300 includes at least one of epoxy resin adhesive, polyurethane adhesive, acrylic adhesive, anaerobic adhesive, silicone adhesive, UV curable adhesive, solvent-based adhesive, water-based adhesive, hot melt adhesive, and pressure-sensitive adhesive, which can be specifically set according to the actual situation.

[0034] like Figure 2As shown, in some embodiments of this application, the relief groove 121 extends along the second direction X. It can be understood that by increasing the length of the relief groove 121 along the second direction X, the contact area between the adhesive 300 and the groove wall of the relief groove 121 is increased, and the bonding area between the single battery and the mounting plate through the adhesive 300 is increased, so as to further improve the stability of the connection between the single battery and the external mounting plate.

[0035] In this embodiment, the width of the relief groove 121 gradually decreases from the direction close to the electrode assembly 200 to the direction away from the electrode assembly 200, so as to limit the adhesive 300 through the groove wall of the relief groove 121. That is, by reducing the diameter of the groove opening of the relief groove 121 on the side away from the electrode assembly 200 along the first direction Z, the stability of the adhesive 300 in the relief groove 121 is further improved, and the adhesive 300 is prevented from falling out of the groove opening of the relief groove 121.

[0036] like Figure 3 As shown, in some embodiments of this application, the bottom wall 120 is provided with a plurality of clearance grooves 121 on the side opposite to the electrode assembly 200, and the plurality of clearance grooves 121 are arranged at intervals along the second direction X.

[0037] It is understandable that the number of clearance slots 121 can be any number of two or more values, and can be set according to the actual situation.

[0038] In some embodiments, a plurality of clearance grooves 121 are arranged at equal intervals along the second direction X. In this embodiment, by increasing the number of clearance grooves 121, the coverage area of ​​the adhesive 300 on the side of the bottom wall 120 opposite to the top cover 110 along the first direction Z can be increased, thereby increasing the bonding area between the adhesive 300 and the external mounting plate, thereby further improving the stability of the bonding between the single cell and the external mounting plate.

[0039] like Figure 4 As shown, in some embodiments of this application, the clearance groove 121 has a first receiving groove 1211 and a second receiving groove 1212 that are connected. The second receiving groove 1212 extends through the bottom wall 120 on the side surface opposite to the top cover 110 along the first direction Z. The first receiving groove 1211 is disposed on the side of the second receiving groove 1212 close to the top cover 110, so that the adhesive 300 can enter the first receiving groove 1211 through the second receiving groove 1212.

[0040] Along the second direction X, the width of the wall of the first receiving groove 1211 is greater than the width of the wall of the second receiving groove 1212, so that the wall of the first receiving groove 1211 can limit the portion of the adhesive 300 disposed in the first receiving groove 1211 along the first direction Z, thereby ensuring the stability of the adhesive 300 disposed in the first receiving groove 1211. At the same time, by reducing the width of the second receiving groove 1212, the difficulty of the adhesive 300 leaking from the second receiving groove 1212 is increased, thereby ensuring the stability of the adhesive 300 in the relief groove 121.

[0041] like Figures 3 to 6 As shown, in some embodiments of this application, the clearance groove 121 extends through the bottom wall 120 along the third direction Y to further increase the length of the clearance groove 121 along the third direction Y, thereby increasing the length of the adhesive 300 along the third direction Y, thereby increasing the bonding area between the side of the bottom wall 120 away from the top cover 110 and the external mounting plate through the adhesive 300, thereby improving the stability of the bonding between the single battery cell and the external mounting plate through the adhesive 300.

[0042] like Figure 5 As shown, in some embodiments of this application, along the first direction Z, the width of the groove wall of the first receiving groove 1211 first increases and then decreases from the side closer to the top cover 110 to the side farther from the top cover 110.

[0043] It is understandable that by increasing the width of the central region of the first receiving groove 1211 along the first direction Z, the volume of the adhesive 300 housed in the first receiving groove 1211 is increased, thereby increasing the bonding area between the adhesive 300 and the groove wall of the first receiving groove 1211, so as to ensure the stability of the adhesive 300 in the first receiving groove 1211. At the same time, by reducing the diameter of the side of the first receiving groove 1211 away from the top cover 110 along the first direction Z, the difficulty of the adhesive 300 disposed in the first receiving groove 1211 leaking from the groove opening of the first receiving groove 1211 is increased, thereby further ensuring the stability of the adhesive 300 in the first receiving groove 1211.

[0044] like Figure 4 As shown, in some embodiments of this application, along the first direction Z, the width of the groove wall of the first receiving groove 1211 is the same from the side near the top cover 110 to the side away from the top cover 110.

[0045] It is understood that a limiting step is formed between the first receiving groove 1211 and the wall of the second receiving groove 1212 along the first direction Z away from the electrode assembly 200, so as to limit the adhesive 300 along the first direction Z towards the electrode assembly 200, thereby ensuring the stability of the connection between the adhesive 300 and the first receiving groove 1211.

[0046] like Figure 6 As shown, in some embodiments of this application, along the first direction Z, the width of the groove wall of the relief groove 121 first increases and then decreases from the side near the top cover 110 to the side away from the top cover 110. It can be understood that by increasing the width of the relief groove 121 in the middle region along the first direction Z, the volume of the adhesive 300 housed in the relief groove 121 is increased, thereby increasing the bonding area between the adhesive 300 and the groove wall of the relief groove 121, ensuring the stability of the adhesive 300 in the relief groove 121. Simultaneously, by reducing the diameter of the relief groove 121 on the side away from the top cover 110 along the first direction Z, the difficulty of leakage of the adhesive 300 from the opening of the relief groove 121 is increased, further ensuring the stability of the adhesive 300 in the relief groove 121.

[0047] like Figure 2 As shown, in some embodiments of this application, the bottom wall 120 is provided with a reinforcing rib 123 on the side near the electrode assembly 200, and the reinforcing rib 123 protrudes in the direction closer to the electrode assembly 200. It can be understood that because the bottom wall 120 has a relief groove 121 on the side away from the electrode assembly 200 along the first direction Z, the thickness of the bottom wall 120 at the relief groove 121 is reduced. The reinforcing rib 123 is used to improve the mechanical strength of the bottom wall 120 and ensure its stability.

[0048] like Figure 7 As shown, in some embodiments of this application, the bottom wall 120 is provided with multiple corner ends 122 at its edge, and the number of reinforcing ribs 123 is multiple. It can be understood that the number of reinforcing ribs 123 can be any number of two or more values, and can be specifically set according to the actual situation.

[0049] One end of each of the reinforcing ribs 123 intersects at the center of the bottom wall 120, and the other end of each reinforcing rib 123 is connected to the corner end 122. The intersecting reinforcing ribs 123 can further enhance the mechanical strength of the bottom wall 120 and ensure the stability of the bottom wall 120.

[0050] like Figure 7As shown, in some embodiments of this application, the edge of the bottom wall 120 is provided with two reinforcing ribs 123, and the edge of the bottom wall 120 has four corner ends 122. One reinforcing rib 123 is connected to two diagonally opposite corner ends 122, and the other reinforcing rib 123 is connected to the other two diagonally opposite corner ends 122. The two reinforcing ribs 123 intersect at the center to form a support frame on the side of the bottom wall 120 facing the top cover 110 along the first direction Z. The two intersecting reinforcing ribs 123 divide the bottom wall 120 into multiple smaller and more stable triangular regions, which greatly improves the rigidity and strength of the bottom wall 120, prevents stress concentration from causing damage, and helps to distribute the load more evenly to all areas of the bottom wall 120.

[0051] It should be noted that the direction in which the bottom wall 120 is most prone to torsional deformation is the diagonal direction. The intersecting reinforcing ribs 123 provided at the four corner ends 122 of the bottom wall 120 directly resist the easily deformable parts of the bottom wall 120, thereby improving the mechanical strength of the bottom wall 120.

[0052] Secondly, this application provides a battery pack that includes the individual battery cells in any of the above embodiments.

[0053] It is understood that the battery pack has the beneficial effects of the individual cells in any of the above embodiments, which will not be elaborated here.

[0054] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0055] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A single-cell battery having a first direction (Z), a second direction (X), and a third direction (Y) that are perpendicular to each other, characterized in that, include: The housing (100) includes a top cover (110) and a bottom wall (120) disposed opposite each other along the first direction (Z). An electrode assembly (200) is disposed in the housing (100) and is located between the top cover (110) and the bottom wall (120). The bottom wall (120) has a relief groove (121) on the side away from the electrode assembly (200) along the first direction (Z). The relief groove (121) is recessed in the first direction (Z) toward the electrode assembly (200) and extends in the third direction (Y). The width of the relief groove (121) in the second direction (X) decreases from the direction near the electrode assembly (200) to the direction away from the electrode assembly (200). An adhesive element (300), at least a portion of which is located in the relief groove (121).

2. The single-cell battery according to claim 1, characterized in that, The clearance groove (121) extends along the second direction (X), and the width of the clearance groove (121) gradually decreases from the direction close to the electrode assembly (200) to the direction away from the electrode assembly (200).

3. The single-cell battery according to claim 1, characterized in that, The bottom wall (120) is provided with a plurality of relief grooves (121) on the side opposite to the electrode assembly (200), and the plurality of relief grooves (121) are arranged at intervals along the second direction (X).

4. The single-cell battery according to claim 3, characterized in that, The clearance groove (121) has a first receiving groove (1211) and a second receiving groove (1212) that are connected. The second receiving groove (1212) extends through the bottom wall (120) on the side surface away from the top cover (110) along the first direction (Z). The first receiving groove (1211) is located on the side of the second receiving groove (1212) close to the top cover (110). Along the second direction (X), the wall width of the first receiving groove (1211) is greater than the wall width of the second receiving groove (1212).

5. The single-cell battery according to claim 4, characterized in that, Along the first direction (Z), the width of the groove wall of the first receiving groove (1211) increases and then decreases from the side closer to the top cover (110) to the side farther away from the top cover (110).

6. The single-cell battery according to claim 4, characterized in that, Along the first direction (Z), the width of the groove wall of the first receiving groove (1211) is the same from the side near the top cover (110) to the side away from the top cover (110).

7. The single-cell battery according to claim 3, characterized in that, Along the first direction (Z), the width of the groove wall of the relief groove (121) increases and then decreases from the side closer to the top cover (110) to the side farther away from the top cover (110).

8. The single-cell battery according to claim 1, characterized in that, The bottom wall (120) is provided with a reinforcing rib (123) on the side near the electrode assembly (200), and the reinforcing rib (123) protrudes along the first direction (Z) toward the direction near the electrode assembly (200).

9. The single-cell battery according to claim 8, characterized in that, The bottom wall (120) has multiple corner ends (122) on its edge, and there are multiple reinforcing ribs (123). One end of each reinforcing rib (123) intersects at the center of the bottom wall (120), and the other end of each reinforcing rib (123) is connected to the corner end (122).

10. A battery pack, characterized in that, The single-cell battery includes any one of claims 1 to 9.

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