Battery cell and electrochemical device and power-using device using the battery cell

Abstract

The present application provides a battery cell, comprising a main body, a tab and a protective cover. The main body comprises a first end. The tab extends from the first end to the main body. The protective cover comprises a first part and a second part, the first part being arranged around the first end, and the second part extending out of the main body and surrounding the tab. An adhesive is provided between the second part, the first end and the tab. The battery cell head of the present application is provided with a protective cover, which can reduce the risk of the battery cell being broken in scenarios such as falling, vibration, impact, extrusion or expansion, as well as the risk of wear, scratching and breaking of the battery cell during manufacturing, assembly, transportation, storage and the like. The protective cover can also cooperate with the battery cell to accommodate the adhesive when the battery cell is being glued, thereby improving the glue filling efficiency and operation convenience of the battery cell. The present application also provides electrochemical devices and electrical devices using the battery cell.

Description

Technical Field

[0001] The present application relates to the field of electrochemistry, and in particular to a battery cell and an electrochemical device and an electrical device using the battery cell. Background Art

[0002] In the existing technology, the top of the battery cell often needs to be filled with glue, and a special clamp is needed to fix the battery cell to assist in the glue filling process. The existing clamp structure is relatively complex, and the efficiency and ease of operation of the battery cell glue filling process need to be improved.

[0003] In existing battery cell structures, there are risks in the mechanical reliability of the battery cell head. During actual use (such as transportation, storage, manufacturing, and assembly), the battery cell or the electrochemical device assembled with the battery cell may suffer damage such as wear and rupture due to falling, vibration, impact, extrusion, expansion, etc.

[0004] How to solve the above problems is something that those skilled in the art need to consider. Summary of the Invention

[0005] In view of this, the present application provides a battery cell, comprising a main body, a tab and a protective cover. The main body comprises a first end. The tab extends from the first end to the main body. The protective cover comprises a first part and a second part, the first part being arranged around the first end, and the second part extending out of the main body and surrounding at least a portion of the tab. An adhesive is provided between the second part, the first end and the tab. Furthermore, the protective cover is arranged on the first end to fix and protect the battery cell, so as to reduce the risk of the battery cell being broken in scenarios such as falling, vibration, impact, extrusion or expansion, and to reduce the risk of wear, scratches and breakage of the battery cell during manufacturing, assembly, transportation, storage and the like. On the other hand, the protective cover can cooperate with the battery cell to accommodate the adhesive when the battery cell is being filled with glue, avoiding the use of special fixtures for individual battery cells, and improving the glue filling efficiency and ease of operation of the battery cell.

[0006] In one possible embodiment, the bonding strength between the protective cover and the adhesive is lower than the bonding strength between the main body and the tab and the adhesive. Furthermore, when the protective cover is separated from the main body, the risk of damage to the battery cell due to excessive adhesion between the protective cover and the adhesive after potting and solidification is reduced.

[0007] In a possible embodiment, the protective cover is not bonded to the adhesive member, thereby reducing the risk of the battery cell being damaged due to the protective cover being separated from the main body and pulling the battery cell.

[0008] In one possible embodiment, along a first direction (the first direction being the width of the main body), the distance of the protective cover along the first direction when not positioned at the first end portion is at least 0.1 mm less than the width of the main body portion, so that when the protective cover is positioned at the first end portion, it is secured to the first end portion via an interference fit in the first direction. Furthermore, the size of the protective cover is slightly smaller than the size of the first end portion, so that when the protective cover is positioned at the first end portion, it achieves an interference fit with the first end portion, thereby enhancing the securing strength.

[0009] In one possible embodiment, along a second direction (the second direction being the thickness direction of the main body), the distance of the protective cover along the second direction when not positioned at the first end portion is at least 0.1 mm less than the thickness of the main body portion, so that when the protective cover is positioned at the first end portion, it is secured to the first end portion via an interference fit in the second direction. Furthermore, the size of the protective cover is slightly smaller than that of the first end portion, so that when the protective cover is positioned at the first end portion, it achieves an interference fit with the first end portion, thereby enhancing the securing strength.

[0010] In one possible embodiment, along a third direction, which is the length direction of the main body, the second portion is at least 0.2 mm higher than the upper edge of the first end portion. Furthermore, the second portion can be used to accommodate the adhesive to complete glue filling or fix the tab.

[0011] In a possible embodiment, the protective cover includes: a first side wall; a second side wall, the second side wall is arranged opposite to the first side wall; a third side wall, including a first rounded section and a second rounded section, the third side wall is connected to the first side wall through the first rounded section, and the third side wall is connected to the second side wall through the second rounded section; a fourth side wall, including a third rounded section and a fourth rounded section, the fourth side wall is connected to the first side wall through the third rounded section, and the fourth side wall is connected to the second side wall through the fourth rounded section.

[0012] In a possible implementation manner, the thickness of the first side wall, the second side wall, the third side wall, and the fourth side wall is less than 0.2 mm.

[0013] In a possible implementation manner, the first side wall, the third side wall, the second side wall, and the fourth side wall are connected in sequence and fixed to the main body.

[0014] In a possible implementation manner, the adhesive includes at least resin.

[0015] The present application also provides an electrochemical device, which includes at least two battery cells assembled together, and the battery cell is the battery cell in any of the aforementioned embodiments.

[0016] The present application also provides an electrical device, which includes a load and the electrochemical device as described above, and the electrochemical device is used to provide electrical energy to the load.

[0017] The battery cell of the present application has a protective cover on its head. The protective cover is used to fix and protect the battery cell, reducing the risk of the battery cell breaking due to falling, vibration, impact, extrusion or expansion. At the same time, it can reduce the risk of wear, scratching and breaking of the battery cell during manufacturing, assembly, transportation and storage. The protective cover can also cooperate with the battery cell to accommodate the adhesive when the battery cell is glued, avoiding the use of special fixtures for individual battery cells, improving the glue filling efficiency and operation convenience of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 1 is a perspective schematic diagram of a battery cell according to an embodiment of the present application.

[0019] Figure 2 This is a three-dimensional schematic diagram of a protective cover according to an embodiment of the present application.

[0020] Figure 3 FIG. 1 is a schematic plan view of a protective cover according to an embodiment of the present application.

[0021] Figure 4 FIG. 1 is a schematic diagram of an electrical device according to an embodiment of the present application.

[0022] Figure 5 FIG. 1 is a schematic diagram of an electrochemical device according to an embodiment of the present application.

[0023] Description of main component symbols

[0024] Battery Cell 10

[0025] Main body part 11

[0026] First end portion 111

[0027] Packaging film 112

[0028] Tab 12

[0029] Protective Case 13

[0030] Part I 1301

[0031] Part II 1302

[0032] First side wall 131

[0033] Second side wall 132

[0034] The third side wall 133

[0035] Fourth side wall 134

[0036] First rounded corner segment 135

[0037] Second rounded corner segment 136

[0038] The third rounded section 137

[0039] Fourth rounded corner segment 138

[0040] Adhesive 14

[0041] Accommodation space 15

[0042] Electrochemical device 1

[0043] Electric device 100

[0044] Load 101

[0045] First direction Z

[0046] Second direction Y

[0047] The third direction X

[0048] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0049] The following description will refer to the accompanying drawings to more fully describe the contents of this application. Illustrated in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make this application thorough and complete and to fully convey the scope of this application to those skilled in the art. Like reference numerals represent identical or similar components.

[0050] The terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. In addition, when used herein, "includes" and / or "comprising" or "including" and / or "including" or "having" and / or "having" integers, steps, operations, components and / or components do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, components, components and / or groups thereof.

[0051] Unless otherwise defined, all terms (including 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. In addition, unless explicitly defined herein, terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and the content of this application, and will not be interpreted as idealized or overly formal meanings.

[0052] The following describes exemplary embodiments with reference to the accompanying drawings. It should be noted that the components depicted in the accompanying drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0053] The specific implementation methods of the present application will be described in further detail below with reference to the accompanying drawings.

[0054] like Figure 1 As shown, the present application provides a battery cell 10, comprising a main body 11, a tab 12 and a protective cover 13. The main body 11 comprises a first end 111; the tab 12 extends out of the main body 11 from the first end 111. The protective cover 13 comprises a first portion 1301 and a second portion 1302. The first portion 1301 is arranged around the first end 111, and the second portion 1302 extends out of the main body 11 and surrounds at least a portion of the tab 12. An adhesive 14 is provided between the second portion 1302 and the first end 111 and the tab 12. The portion of the second portion 1302 that is higher than the first end 111 is enclosed with at least one surface of the first end 111 to accommodate the adhesive 14. The tab 12 is provided at the first end 111, and at least a portion of the tab 12 is in contact with the adhesive 14.

[0055] In one embodiment, the adhesive 14 at least includes resin. In other embodiments, the adhesive 14 can further be a curing material such as water-based adhesive or foam adhesive.

[0056] The main body 11 may be an electrode assembly, for example, a plurality of overlapping, stacked or wound positive electrode sheets, separators and negative electrode sheets wrapped by a packaging film 112. The tabs 12 may be led out from the current collectors of the positive electrode sheets and the negative electrode sheets in the main body 11, or may be an external conductor structure. The tabs 12 are connected to the main body 11 at the first end 111, and the top sealing structure of the battery cell 10 may also be provided at the first end. In one embodiment, the top sealing structure may be the sealing part of the packaging film 112, that is, the packaging film 112 is sealed after wrapping the electrode assembly, so that the edges of the packaging film 112 are bonded by bonding or hot pressing to achieve sealing; the tabs 12 may pass through the top sealing structure to enable the electrode assembly to achieve electrical contact with external electronic components.

[0057] The protective cover 13 can be used to fix and protect the battery cell 10. It can surround and reinforce the main body 11 through interference fit and protect the battery cell 10. The second part 1302 that is higher than the first end 111 protects the connection area between the main body 11 and the tab 12, thereby reducing the risk of the battery cell 10 possibly breaking in scenarios such as falling, vibration, impact, extrusion or expansion. At the same time, it can reduce the risk of the battery cell 10 possibly being worn, scratched, or broken during the manufacturing, assembly, transportation, storage, and the like.

[0058] In one embodiment, along a first direction Z, which is the width direction of the main body 11, when the protective cover 13 is not provided at the first end portion 111, the distance along the first direction Z is at least 0.1 mm smaller than the width of the main body 11, so that when the protective cover 13 is provided at the first end portion 111, it is fixed to the first end portion 111 in the first direction Z by an interference fit, thereby achieving sealing and tightening of the battery cell 10 in the width direction of the main body 11.

[0059] In one embodiment, along a second direction Y, which is the thickness direction of the main body 11, when the protective cover 13 is not provided at the first end portion 111, the distance along the second direction Y is at least 0.1 mm less than the thickness of the main body 11. This allows the protective cover 13 to be fixed to the first end portion 111 in the second direction Y by an interference fit when provided at the first end portion 111, thereby achieving sealing and tightening of the battery cell 10 in the thickness direction.

[0060] The size of the protective cover 13 is slightly smaller than that of the first end portion 111 , so that when the protective cover 13 is sleeved on the first end portion 111 , an interference fit is achieved with the first end portion 111 , thereby enhancing the fixing strength.

[0061] The protective cover 13 fastens the main body 11 of the battery cell 10 in both the first direction Z and the second direction Y, thereby preventing the electrodes, diaphragms, etc. in the main body 11 from undergoing structural changes due to collision.

[0062] In one embodiment, along a third direction X, which is the lengthwise direction of the body 11, the second portion 1302 is at least 0.2 mm higher than the upper edge of the first end 111. In this embodiment, the edge of the protective cover 13 near the top of the tab 12 is higher than the edge of the first end 111, so that the protective cover 13 can protect the top of the battery cell 10, and can protect the first end 111 of the body 11, the tab 12 provided at the first end 111, and the top seal structure between the tab 12 and the body 11, to prevent wear on this portion.

[0063] Among them, the first direction Z is the width direction of the main body 11, the second direction Y is the thickness direction of the main body 11, and the third direction X is the length direction of the main body 11. It can be understood that the first direction Z, the second direction Y and the third direction X are perpendicular to each other.

[0064] The protective cover 13 cooperates with the main body 11 to accommodate the adhesive 14 during glue potting at the top of the battery cell 10. Specifically, the protective cover 13 surrounds the first end 111 of the main body 11 and extends above the upper edge of the first end 111 to form a receiving space 15 with the main body 11. The top seal structure of the main body 11 can be located at the first end 111. The tab 12 is connected to the main body 11 at the first end 111 to complete the package. The potting adhesive 14 is injected into the receiving space 15 to cover the top seal structure of the battery cell 10 to complete the glue potting. This avoids the need for special fixtures for individual battery cells 10, improving glue potting efficiency and ease of operation.

[0065] After the battery cell 10 is filled with glue, the protective cover 13 can be retained in the battery cell 10 to fasten and protect the body 11 and the tab 12 of the battery cell 10. The protective cover 13 can also be removed in other subsequent processes. In this application scenario:

[0066] In one embodiment, the bonding strength between the protective cover 13 and the adhesive 14 is lower than the bonding strength between the main body 11 and the tab 12 and the adhesive 14. For example, the protective cover 13 and the main body 11 or the tab 12 may be made of different materials, or the surface of the protective cover 13 may be coated with a film that reduces the bonding strength between the protective cover 13 and the adhesive 14. This reduces the risk of damage to the battery cell 10 caused by excessive adhesion between the protective cover 13 and the adhesive 14 after potting and solidification when the protective cover 13 is separated from the main body 11.

[0067] In other embodiments, the protective cover 13 is not bonded to the adhesive 14. For example, the protective cover 13 and the adhesive 14 may be made of materials that do not bond to each other, or the surface of the protective cover 13 may be provided with a material that does not bond to the adhesive 14. This further reduces the risk of damage to the battery cell 10 caused by the protective cover 13 separating from the body 11 and pulling on it.

[0068] like Figure 2 and Figure 3As shown, the protective cover 13 includes a first side wall 131, a second side wall 132, a third side wall 133, and a fourth side wall 134. The second side wall 132 is spaced apart from the first side wall 131 and is disposed opposite thereto. The third side wall 133 includes a first rounded section 135 and a second rounded section 136 disposed on either side of the third side wall 133. The third side wall 133 is connected to the first side wall 131 via the first rounded section 135, and is connected to the second side wall 132 via the second rounded section 136. The fourth side wall 134 includes a third rounded section 137 and a fourth rounded section 138 disposed on either side of the fourth side wall 134. The fourth side wall 134 is connected to the first side wall 131 via the third rounded section 137, and is connected to the second side wall 132 via the fourth rounded section 138.

[0069] Among them, when the protective cover 13 is mounted on the main body 11, the first rounded section 135, the second rounded section 136, the third rounded section 137 and the fourth rounded section 138 can be correspondingly arranged at the four corners of the end of the main body 11. On the one hand, the tightness of the connection between the protective cover 13 and the main body 11 can be improved, and on the other hand, the risk of damage to the four corners of the main body 11 due to external physical impact can be reduced.

[0070] In one embodiment, the thickness of the first sidewall 131 , the second sidewall 132 , the third sidewall 133 , and the fourth sidewall 134 is less than 0.2 mm. Controlling the thickness of the first sidewall 131 , the second sidewall 132 , the third sidewall 133 , and the fourth sidewall 134 to less than 0.2 mm reduces the weight of the protective cover 13 and the overall cost of the battery cell 10 .

[0071] In one embodiment, the first side wall 131 , the second side wall 132 , the third side wall 133 and the fourth side wall 134 are sequentially connected to form a rigid whole and fixed to the main body 11 to fix the main body 11 .

[0072] like Figure 5 As shown, the present application also provides an electrochemical device 1, which includes a plurality of assembled battery cells 10. During the assembly process of the electrochemical device 1, the protective cover 13 can protect the battery cells 10, preventing the battery cells 10 from being worn, scratched, or cracked during the assembly process. Furthermore, after the electrochemical device 1 is assembled, the protective cover 13 can protect the battery cells during transportation and storage of the electrochemical device 1, preventing the battery cells 10 from being worn, scratched, or cracked during the assembly process.

[0073] like Figure 4As shown, an embodiment of the present application further provides an electrical device 100, which includes an electrochemical device 1 and a load 101. The electrochemical device 1 is used to power the load 101. The electrical device 100 of the present application is not particularly limited and can be any electrical device known in the art. In this embodiment, the electrical device 100 includes at least one of a one-wheeled or two-wheeled electric vehicle, a power tool, or a drone.

[0074] In other embodiments, the electrical device 100 may include, but is not limited to, laptop computers, pen-type computers, mobile computers, e-book players, portable communication devices, portable copiers, portable printers, backup power supplies, motors, lighting fixtures, toys, power tools, large household batteries, and lithium-ion capacitors.

[0075] The specific embodiments of the present application have been described above with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications and substitutions may be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. Such modifications and substitutions are intended to fall within the scope of the present application.

Claims

1. A battery cell, characterized in that: include: a main body portion, the main body portion including a first end portion; a tab extending from the first end portion to the main body portion; a protective cover comprising a first portion and a second portion, wherein the first portion is sheathed around the first end portion, and the second portion extends out of the main body and surrounds at least a portion of the tab; and An adhesive is provided between the second portion, the first end portion and the tab.

2. The battery cell according to claim 1, wherein: The bonding strength between the protective cover and the adhesive is smaller than the bonding strength between the main body and the tab and the adhesive.

3. The battery cell according to claim 1, wherein: The protective cover is not bonded to the adhesive member.

4. The battery cell according to any one of claims 1 to 3, characterized in that: Along a first direction, which is the width direction of the main body, the distance along the first direction when the protective cover is not provided at the first end portion is at least 0.1 mm smaller than the width of the main body portion, so that when the protective cover is provided at the first end portion, it is fixed to the first end portion in the first direction by interference fit.

5. The battery cell according to claim 4, wherein: Along a second direction, which is the thickness direction of the main body, the distance along the second direction when the protective cover is not provided at the first end is at least 0.1 mm smaller than the thickness of the main body, so that when the protective cover is provided at the first end, it is fixed to the first end in the second direction by interference fit.

6. The battery cell according to claim 4, wherein: Along a third direction, which is the length direction of the main body, the second portion is at least 0.2 mm higher than the upper edge of the first end portion.

7. The battery cell according to any one of claims 1 to 3, characterized in that: The protective cover comprises: a first side wall; a second side wall, the second side wall being spaced apart and arranged opposite to the first side wall; a third sidewall, comprising a first rounded section and a second rounded section, the third sidewall being connected to the first sidewall via the first rounded section, and the third sidewall being connected to the second sidewall via the second rounded section; and The fourth side wall includes a third rounded corner segment and a fourth rounded corner segment. The fourth side wall is connected to the first side wall through the third rounded corner segment, and the fourth side wall is connected to the second side wall through the fourth rounded corner segment.

8. The battery cell according to claim 7, wherein: The thickness of the first side wall, the second side wall, the third side wall, and the fourth side wall is less than 0.2 mm.

9. The battery cell according to claim 7, wherein: The first side wall, the third side wall, the second side wall, and the fourth side wall are connected in sequence and fixed to the main body.

10. The battery cell according to claim 1, wherein: The adhesive member includes at least resin.

11. An electrochemical device, characterized in that: The electrochemical device comprises at least two battery cells assembled together, and the battery cell is the battery cell according to any one of claims 1 to 3.

12. An electrical device, characterized in that: The electrical device includes a load and the electrochemical device according to claim 11, wherein the electrochemical device is used to provide electrical energy to the load.

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