Battery and battery pack

Abstract

The application provides a battery and a battery pack. The battery comprises: a lamination assembly comprising at least one lamination cell, the lamination assembly comprising two first side surfaces arranged opposite to each other along a first direction, and an assembly bottom surface and an assembly top surface arranged opposite to each other along a second direction; the first direction is the thickness direction of the lamination cell, and the second direction is perpendicular to the first direction; and an insulation film covering the assembly bottom surface, the assembly top surface, and the two first side surfaces; the insulation film comprises two first free ends, the two first free ends are fixed to the assembly top surface, and are arranged in a laminated manner in at least a partial region of the assembly top surface. The battery and the battery pack provided by the application have higher safety.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a battery and a battery pack. Background Technology

[0002] In the development of battery technology, besides improving cell performance, safety is also a crucial issue that cannot be ignored. If battery safety cannot be guaranteed, then the battery is unusable. Therefore, how to enhance battery safety is a pressing technical problem that needs to be solved in battery technology. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery and battery pack that at least partially solves the problem of how to enhance battery safety.

[0004] To achieve the above objectives, a first aspect of this application provides a battery comprising: a stacked assembly including at least one stacked cell, the stacked assembly including two first side surfaces disposed opposite to each other along a first direction, and a bottom surface and a top surface disposed opposite to each other along a second direction; the first direction being the thickness direction of the stacked cell, and the second direction being perpendicular to the first direction; an insulating film covering the bottom surface, the top surface, and the two first side surfaces; the insulating film including two first free ends, the two first free ends being fixed to the top surface and stacked in at least a portion of the top surface.

[0005] Optionally, the battery includes a cover assembly disposed on the top surface of the component away from the bottom surface of the component, and the cover assembly includes an explosion-proof valve; along the second direction, the projection of the explosion-proof valve on the top surface of the component does not overlap with the insulating film.

[0006] Optionally, the first free end of the insulating film is provided with a clearance opening, which corresponds to the explosion-proof valve.

[0007] Optionally, the stacked assembly includes two second sides disposed opposite each other along a third direction, the third direction being perpendicular to the first direction and the second direction; the insulating film extends at least to the second sides along the third direction.

[0008] Optionally, the insulating film includes a non-adhesive area disposed along the edge of the second side surface; the insulating film is connected to the stacked assembly by an adhesive layer disposed on the insulating film in areas other than the non-adhesive area.

[0009] Optionally, the stacked assembly includes two second sides disposed opposite to each other along a third direction, and tabs extending from the second sides; the battery includes an adapter and a cover assembly, the adapter including a first part and a second part connected to each other and configured in an L-shape, the cover assembly including a terminal post; the first part is close to the second side and electrically connected to the tabs, the cover assembly is disposed on the side of the top surface of the assembly away from the bottom surface of the assembly, and the second part is disposed between the top surface of the assembly and the cover assembly and electrically connected to the terminal post.

[0010] Optionally, each of the stacked cells includes a plurality of positive electrode plates and a plurality of negative electrode plates arranged alternately in a first direction, and a separator that isolates the positive electrode plates and the negative electrode plates; the separator includes two second free ends, which are bent toward the top surface of the component or the bottom surface of the component.

[0011] Optionally, along a third direction, the size of the diaphragm is smaller than the size of the insulating film; the third direction is perpendicular to the first direction and the second direction.

[0012] Optionally, the diaphragm is folded in a "Z" shape to form a plurality of insertion spaces, the plurality of insertion spaces including a first space and a second space alternately arranged along the first direction, the positive electrode being inserted into the first space and the negative electrode being inserted into the second space.

[0013] Based on the same inventive concept, a second aspect of this application also provides a battery pack, including a base plate and a battery as described in the first aspect, wherein the battery is fixed to the base plate and the top surface of the assembly is disposed away from the base plate.

[0014] As can be seen from the above, the battery and battery pack provided in this application have an insulating film that can continuously cover the bottom surface, two first side surfaces, and top surface of the stacked cell assembly. Even if the folded edge size formed by the starting and ending ends of the separator of the stacked cell is small, the insulating film can cover a large area or even the entire area of ​​the folded edge, achieving effective pressing. This not only prevents the folded edge of the separator from lifting, but also provides coverage and protection for the separator, preventing the electrode sheets inside the stacked cell from being exposed, which helps to improve the safety performance of the battery.

[0015] Meanwhile, the two first free ends of the insulating film are stacked and connected to each other, which can reliably restrain the circumferential direction of the stacked assembly. When the stacked cell expands, it can squeeze the stacked cell to reduce the gap between two adjacent structural layers inside the stacked cell and reduce the risk of lithium plating.

[0016] Furthermore, by stacking and connecting the two first free ends on the top surface of the module, the surface of the insulating film in contact with the bottom surface of the module is flat. This effectively reduces the risk of the stacked cells being damaged by the insulating film when the battery is subjected to vibration and impact.

[0017] It should also be noted that by setting an insulating film that wraps around the stacked assembly in this embodiment, the Mylar film on the outside of the stacked assembly can be eliminated. This not only reduces the material cost of the battery, but also helps to simplify the battery assembly process, improve the conversion efficiency, and facilitate mass production. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a partial schematic diagram of a battery with a first structure according to an embodiment of this application; Figure 2 This is a partial schematic diagram of a stacked battery assembly with a second structure according to an embodiment of this application. Figure 3 This is a side view of a stacked assembly of a battery with an insulating film covering, representing a second structure according to an embodiment of this application. Figure 4 This is a schematic diagram of the connection of an insulating film to a battery with a second structure according to an embodiment of this application. Figure 5 This is a schematic diagram showing the stacked connection of the two first free ends of the insulating film of the battery with the second structure according to an embodiment of this application. Figure 6 This is a partial schematic diagram of a battery with a second structure according to an embodiment of this application; Figure 7 This is a partial cross-sectional schematic diagram of a stacked cell of a battery with a second structure according to an embodiment of this application. Figure 8 This is a partial cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 1000, battery; 100. Laminated assembly; 110. Laminated cell; 111. Positive electrode; 112. Negative electrode; 113. Separator; 1131. Second free end; 114. Insertion space; 1141. First space; 1142. Second space; 120. First side surface; 130. Bottom surface of the module; 140. Top surface of the module; 150. Second side surface; 160. Electrode tab; 200, Insulating film; 210, First free end; 220, Clearance opening; 230, Adhesive-free area; 240, Adhesive layer; 300. Cover plate assembly; 310. Explosion-proof valve; 320. Terminal post; 330. Cover plate; 340. Insulating component; 400. Adapter; 410. Part 1; 420. Part 2; 500, Adhesive tape; 600, Mylar film; 700. Electrode assembly; 2000, base plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0022] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0023] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0024] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0025] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Figure 1 A partial schematic diagram of the first type of battery 1000 is shown.

[0027] like Figure 1 The battery 1000 includes a cover plate assembly 300 and an electrode assembly. The cover plate assembly 300 includes a cover plate 330, a terminal post 320 connected to the cover plate 330, and an insulating member 340. The terminal post 320 is inserted through and connected to the cover plate 330, and the insulating member 340 is connected to the side of the cover plate 330 near the electrode assembly 700, thus insulating the cover plate 330 and the electrode assembly 700 from each other. The tabs 160 of the electrode assembly 700 can be electrically connected to the terminal post 320. A shell-shaped Mylar membrane 600 is fitted onto the outside of the electrode assembly 700. The Mylar membrane 600 has an opening at its upper end, and the opening is thermally fused to the sidewall of the insulating member 340, thus ensuring the relative stability of the Mylar membrane 600, the electrode assembly 700, and the cover plate assembly 300.

[0028] However, the applicant discovered that for the stacked electrode assembly 700, the starting or ending end of the diaphragm 113, after bending, is located at the top of the electrode assembly 700, i.e., close to the insulating member 340. Taking the ending end as an example, if the folded edge formed after bending is small, a large spring force will be generated, causing the folded edge to curl up under the action of this spring force. After curling up, the folded edge will interfere with the insulating member 340, hindering the thermal fusion connection between the Mylar membrane 600 and the insulating member 340. More seriously, when the Mylar membrane 600 and the insulating member 340 are thermally fused together, the curled folded edge will be close to the fusion point. The heat generated during fusion may cause the diaphragm 113 to shrink due to heat, thereby exposing the electrode sheets inside the electrode assembly 700 locally, causing safety issues.

[0029] Although you can use tape to fold the edges 500 times to restrain it completely, but as... Figure 1 As shown, the overall width dimension of the diaphragm 113 (e.g.) Figure 1 If the size in the X direction is large, and the tape 500 is only set in a part of the top of the electrode assembly 700, then there is still a risk of curling at the fold between two adjacent tapes 500.

[0030] During the charging and discharging process of battery 1000, the stacked electrode assembly 700 will expand and contract. Simultaneously, as... Figure 1 As shown, if the tape 500 is only applied to a portion of the top and bottom of the electrode assembly 700, it is difficult to effectively restrain the electrode assembly 700. Therefore, when the electrode assembly 700 expands and contracts, the gap between adjacent structural layers in the electrode assembly 700 may become too large. This can lead to an increase in ion channels in the electrode assembly 700, posing a risk of lithium plating.

[0031] To address the aforementioned issues, embodiments of this application provide a battery 1000 with other structures.

[0032] Figure 2This shows a partial schematic diagram of the stacked assembly 100 of the battery 1000 with the second structure. Figure 3 A side view of a stacked assembly 100 of a battery with a second structure, covered with an insulating film 200, is shown.

[0033] like Figure 2 and Figure 3 In some embodiments, the battery 1000 includes: a stacked assembly 100, including at least one stacked cell 110, the stacked assembly 100 including cells along a first direction (e.g., ... Figure 2 Two first side surfaces 120 arranged opposite to each other in the Y direction, and along the second direction (e.g. Figure 2 The module has a bottom surface 130 and a top surface 140 arranged opposite to each other in the Z direction; the first direction is the thickness direction of the stacked cell 110, and the second direction is perpendicular to the first direction; an insulating film 200 covers the module bottom surface 130, the module top surface 140, and two first side surfaces 120; the insulating film 200 includes two first free ends 210, which are fixed to the module top surface 140 and are stacked in at least a portion of the module top surface 140.

[0034] It should be noted that the insulating film 200 needs to be formed from a film material with suitable hardness. Specifically, the insulating film 200 needs to have a certain degree of bendability to ensure a reliable connection with the surface of the laminated assembly 100 after bending, and the insulating film 200 itself should not warp. This requires that the hardness of the insulating film 200 cannot be too high. At the same time, the insulating film 200 also needs to restrain the laminated cell 110 when it expands, and it also needs to be resistant to damage. This requires that the hardness of the insulating film 200 cannot be too low.

[0035] For example, Figure 2 The mid-laminated assembly 100 includes two laminated cells 110 stacked along a first direction, combined with Figure 3 The top surfaces of the two stacked cells 110 form the top surface 140 of the assembly, and the bottom surfaces of the two stacked cells 110 form the bottom surface 130 of the assembly. The side with the larger surface area of ​​one of the stacked cells 110 serves as one of the first side surfaces 120 of the stacked assembly 100, and the side with the larger surface area of ​​the other stacked cell 110 serves as the other first side surface 120 of the stacked assembly 100.

[0036] For example, the tab 160 of the laminated cell 110 can be led out from the top or from the side with a smaller surface area. When the tab 160 is led out from the top of the laminated cell 110, the insulating film 200 needs to give way to the tab 160.

[0037] For example, the insulating film 200 and the stacked assembly 100 can be connected by means of adhesive or heat fusion.

[0038] Figure 4 A schematic diagram showing the connection of the insulating film 200 to the laminated assembly 100 is shown. Figure 5 A schematic diagram showing the stacked connection of the two first free ends 210 of the insulating film 200 is presented.

[0039] by Figure 4 Taking the structure and orientation shown as an example, when covering the insulating film 200 onto the laminated assembly 100, the laminated assembly 100 can be first positioned in the middle of the insulating film 200, and the bottom surface 130 of the assembly can be connected to the insulating film 200. Then, the insulating film 200 located on both sides of the laminated assembly 100 along the first direction is bent upwards to connect the insulating film 200 to the two first side surfaces 120. At this time, both first free ends 210 of the insulating film 200 extend vertically upwards beyond the top surface 140 of the assembly. Figure 5 Finally, one of the first free ends 210 of the insulating film 200 is bent toward the top surface 140 of the component and connected to the top surface 140 of the component. Then, the other first free end 210 is bent toward the top surface 140 of the component and connected to the upper surface of the first free end 210, so as to achieve the stacking of the two first free ends 210.

[0040] like Figure 3 Since the edges of the two first free ends 210 are difficult to align with the edges of the surfaces they are on, the surfaces of the two first free ends 210 facing the stacked cells 110 are not flat after being stacked. If this uneven surface faces the bottom surface 130 of the assembly, when the battery 1000 vibrates, the bottom plate of the battery 1000 casing will impact the stacked cells 110 through the insulating film 200, and the aforementioned uneven surface may damage the electrodes of the stacked cells 110.

[0041] To avoid the above problems, in this embodiment, the two first free ends 210 are designed to be stacked on the top surface 140 of the component. In this way, the surface of the insulating film 200 in contact with the bottom surface 130 of the component is a flat surface, which can effectively reduce the risk of the stacked cells 110 being damaged by the insulating film 200.

[0042] As can be seen from the above, in the battery 1000 of this embodiment, the insulating film 200 can continuously cover the bottom surface 130, the two first side surfaces 120 and the top surface 140 of the stacked cell 100. Even if the folded edge size formed by the starting end and the ending end of the separator 113 of the stacked cell 110 is small, the insulating film 200 can cover a large area or even the entire area of ​​the folded edge, achieving effective pressing. This not only prevents the folded edge of the separator 113 from lifting, but also provides coverage and protection for the separator 113, preventing the electrode sheets inside the stacked cell 110 from being exposed, which helps to improve the safety performance of the battery 1000.

[0043] Meanwhile, the two first free ends 210 of the insulating film 200 are stacked and connected to each other, which can enable the insulating film 200 to reliably restrain the stacked assembly 100 in the circumferential direction. When the stacked cell 110 expands, it can squeeze the stacked cell 110 to reduce the gap between two adjacent structural layers inside the stacked cell 110 and reduce the risk of lithium plating.

[0044] Furthermore, the two first free ends 210 are stacked and connected to the top surface 140 of the module, and correspondingly, the surface of the insulating film 200 that contacts the bottom surface 130 of the module is a flat surface. When the battery 1000 is subjected to vibration and impact, the risk of the stacked cells 110 being damaged by the insulating film 200 can be effectively reduced.

[0045] It should also be noted that by setting an insulating film 200 that wraps around the stacked assembly 100 in this embodiment, the Mylar film 600 can be eliminated from being installed on the outside of the stacked assembly 100. This not only reduces the material cost of the battery 1000, but also helps to simplify the assembly process of the battery 1000, improve the conversion efficiency, and facilitate mass production.

[0046] Figure 6 A partial schematic diagram of the second type of battery 1000 is shown.

[0047] like Figure 6 In some embodiments, the battery 1000 includes a cover assembly 300 disposed on the side of the top surface 140 of the component away from the bottom surface 130 of the component, and the cover assembly 300 includes an explosion-proof valve 310; along the second direction, the projection of the explosion-proof valve 310 on the top surface 140 of the component does not overlap with the insulating film 200.

[0048] When thermal runaway occurs in battery 1000, the stacked cell 110 will generate high-temperature gas (which may carry particulate matter). In order to ensure the safety of the cell, these high-temperature gases need to be discharged from battery 1000 in a timely manner to prevent explosion.

[0049] In order to provide an venting opening in the event of thermal runaway of the battery 1000, an explosion-proof valve 310 is provided on the cover assembly 300. The explosion-proof valve 310 can be opened when it is compressed by high-temperature gas, and the high-temperature gas can be discharged through the opened explosion-proof valve 310.

[0050] However, if the area of ​​the top surface 140 of the laminated assembly 100 that faces the explosion-proof valve 310 is covered by the insulating film 200, then when one of the laminated cells 110 of the laminated assembly 100 experiences thermal runaway, the high-temperature gas it generates will have difficulty breaking through the insulating film 200, which will hinder the flow of the high-temperature gas to the explosion-proof valve 310. This may lead to a continuous reaction inside the battery 1000, generating a large amount of heat, and in severe cases, it may cause thermal runaway of the adjacent laminated cells 110.

[0051] To avoid the aforementioned problems, in this embodiment, no insulating film 200 is provided on the area of ​​the top surface 140 of the component directly opposite the explosion-proof valve 310, and the laminated cell 110 is exposed in this area. When the laminated cell 110 experiences thermal runaway, the generated high-temperature gas can act directly and smoothly on the explosion-proof valve 310, forcing the explosion-proof valve 310 to open. The high-temperature gas can then be discharged to the outside in a timely manner through the explosion-proof valve 310, which helps to improve the safety performance of the battery 1000.

[0052] like Figure 4 , Figure 5 and Figure 6 In some embodiments, the first free end 210 of the insulating film 200 is provided with a clearance opening 220, which corresponds to the explosion-proof valve 310.

[0053] It should be noted that both first free ends 210 of the insulating film 200 are provided with clearance openings 220. When the two first free ends 210 are stacked and connected, the two clearance openings 220 of the two first free ends 210 are in corresponding positions and connected to each other, and will not cause obstruction.

[0054] For example, the clearance opening 220 extends along a first direction to the edge of the top surface 140 of the component.

[0055] like Figure 4 Depending on the dimensions of the laminated assembly 100, clearance openings 220 can be provided at predetermined positions on the two first free ends 210 of the insulating film 200. For example... Figure 5 During the process of covering the insulating film 200 onto the laminated assembly 100, when the two first free ends 210 are stacked and connected, the clearance openings 220 on the two first free ends 210 need to be aligned so that the area on the top surface 140 of the assembly that faces the explosion-proof valve 310 can be exposed through the clearance openings 220. In the event of thermal runaway of the laminated cell 110, the high-temperature gas it generates can flow directly to the explosion-proof valve 310 through the clearance openings 220.

[0056] like Figure 4 and Figure 5 In some embodiments, the stacked assembly 100 includes components along a third direction (e.g., Figure 4 Two second side surfaces 150 are arranged opposite each other in the X direction, and the third direction is perpendicular to the first and second directions; the insulating film 200 extends at least to the second side surfaces 150 along the third direction.

[0057] To ensure that the insulating film 200 can fully cover the bottom surface 130, the two first side surfaces 120, and the top surface 140 of the module, the width of the insulating film 200 (i.e., the dimension along the third direction) can be designed. When the insulating film 200 extends to the second side surface 150 at both ends along the third direction, the insulating film 200 can achieve full coverage of the bottom surface 130 and the two first side surfaces 120 of the module, reducing the risk of contact between the laminated cell 110 and the metal casing of the battery 1000, and can reliably achieve mutual insulation between the laminated cell 110 and the casing.

[0058] like Figure 4 and Figure 5 In some embodiments, the insulating film 200 includes a non-adhesive region 230 disposed along the edge of the second side 150; the insulating film 200 is connected to the stack assembly 100 by an adhesive layer 240 disposed on the insulating film 200 in the area other than the non-adhesive region 230.

[0059] For example, the adhesive layer 240 is continuously disposed on the insulating film 200 in the areas excluding the adhesive-free area 230.

[0060] It should be noted that the dimension of the adhesive layer 240 along the third direction is smaller than the dimension of the stacked assembly 100 along the third direction.

[0061] Understandably, the larger the surface contact area between the adhesive layer 240 and the laminate assembly 100, the higher the reliability of the connection between the insulating film 200 and the laminate assembly 100.

[0062] However, if the adhesive layer 240 extends beyond the second side 150 in a third direction, the excess portion will be exposed. During the assembly of the battery 1000, the exposed adhesive layer 240 is prone to attracting dirt, which is detrimental to foreign object control. Foreign objects attached to the adhesive layer 240 may adversely affect the creepage distance inside the battery 1000, thereby resulting in lower safety performance of the battery 1000.

[0063] To avoid the aforementioned problems, this embodiment provides a glue-free area 230 at the edge of the insulating film 200 near the second side surface 150, and no adhesive layer 240 is provided within the glue-free area 230. This ensures that the adhesive layer 240 does not extend beyond the second side surface 150 in any third direction, effectively preventing the adhesive layer 240 from being exposed. This facilitates foreign object control during battery 1000 assembly and helps improve the safety performance of the battery 1000.

[0064] like Figure 6In some embodiments, the stacked assembly 100 includes two second side surfaces 150 disposed opposite each other along a third direction, and tabs 160 extending from the second side surfaces 150; the battery 1000 includes an adapter 400 and a cover assembly 300, the adapter 400 including a first portion 410 and a second portion 420 connected to each other and configured in an L-shape, and the cover assembly 300 including a terminal post 320; the first portion 410 is close to the second side surface 150 and electrically connected to the tab 160, the cover assembly 300 is disposed on the side of the top surface 140 of the assembly away from the bottom surface 130 of the assembly, and the second portion 420 is disposed between the top surface 140 of the assembly and the cover assembly 300 and electrically connected to the terminal post 320.

[0065] For example, the first part 410 and the second part 420 are welded or integrally formed together.

[0066] For example, the first part 410 is welded to the tab 160 to achieve electrical connection, and the second part 420 is welded to the post 320 to achieve electrical connection.

[0067] For example, when the stacked assembly 100 includes two stacked cells 110, the tabs 160 of the same polarity of the two stacked cells 110 can be connected to the same adapter 400.

[0068] In this embodiment, the tab 160 extends from the second side 150, so the insulating film 200 can cover the area on the top surface 140 of the component except for the area corresponding to the explosion-proof valve 310. On the one hand, it can more effectively press the starting and ending ends of the diaphragm 113 to prevent the folded edges of the diaphragm 113 from lifting. On the other hand, it can increase the restraining force of the insulating film 200 on the stacked cells 110, further reducing the risk of lithium plating.

[0069] Combination Figure 6 Through the L-shaped adapter 400, the tab 160 located on the second side 150 can be electrically connected to the pole 320 located above the top surface 140 of the assembly.

[0070] Figure 7 A partial cross-sectional schematic diagram of a stacked battery cell 110 is shown.

[0071] like Figure 7 In some embodiments, each stacked cell 110 includes a plurality of positive electrode plates 111 and a plurality of negative electrode plates 112 arranged alternately in a first direction, and a separator 113 that isolates the positive electrode plates 111 and the negative electrode plates 112; the separator 113 includes two second free ends 1131, which are bent toward the top surface 140 or the bottom surface 130 of the component.

[0072] It should be noted that one of the two second free ends 1131 of the diaphragm 113 is the starting end of the diaphragm 113 mentioned above, and the other is the ending end of the diaphragm 113 mentioned above.

[0073] For example, multiple positive electrode plates 111 and multiple negative electrode plates 112 are stacked alternately along a first direction, and the negative electrode plates 112 are located at the beginning and the end.

[0074] by Figure 7 Taking the structure and orientation shown as an example, multiple positive electrode plates 111 and multiple negative electrode plates 112 are stacked alternately along the first direction. In addition to setting a separator 113 between adjacent positive electrode plates 111 and negative electrode plates 112, the separator 113 also wraps the relatively outer surface of the negative electrode plate 112 located at the first end and the relatively outer surface of the negative electrode plate 112 located at the tail end.

[0075] After the diaphragm 113 wraps around the negative electrode plates 112 at both ends, both second free ends 1131 of the diaphragm 113 extend upwards and beyond their respective negative electrode plates 112. Then, the two second free ends 1131 of the diaphragm 113 are bent horizontally and fixed.

[0076] It should be noted that, as Figure 7 When the diaphragm 113 has a Z-shaped folded structure, it will form multiple spaces with upward openings. The second free end 1131 can block at least part of the upward openings after being bent.

[0077] like Figure 7 In some embodiments, the diaphragm 113 is folded in a “Z” shape to form a plurality of insertion spaces 114, the plurality of insertion spaces 114 including a first space 1141 and a second space 1142 alternately arranged along a first direction, the positive electrode 111 being inserted into the first space 1141 and the negative electrode 112 being inserted into the second space 1142.

[0078] Combination Figure 4 and Figure 7 Diaphragm 113 is as follows Figure 7After the Z-shaped fold shown, a first space 1141 and a second space 1142 are formed, overlapping along a first direction. The first space 1141 may have openings located on the bottom surface 130 and the second side surface 150 of the component, and the second space 1142 may have openings located on the top surface 140 and the second side surface 150 of the component. A positive electrode 111 is inserted into the first space 1141, and a negative electrode 112 is inserted into the second space 1142. Each positive electrode 111 has a portion extending from the opening on the second side surface 150 of the first space 1141, and the extended portions of multiple positive electrode 111 are stacked and connected to form the positive tab of the laminated cell 110. Similarly, each negative electrode 112 has a portion extending from the opening on the second side surface 150 of the second space 1142, and the extended portions of multiple negative electrode 112 are stacked and connected to form the negative tab.

[0079] As can be seen from the foregoing, after the insulating film 200 surrounds and confines the stacked cell 110, it can provide extrusion pressure from both sides of the stacked cell 110 along the first direction to limit the spacing distance between the separator 113 and the positive electrode 111 along the first direction, thereby reducing the risk of lithium plating.

[0080] like Figure 4 and Figure 7 In some embodiments, along a third direction, the size of the diaphragm 113 is smaller than the size of the insulating film 200.

[0081] In conjunction with the foregoing, the separator 113 is Z-shaped folded, and the portion covering the first negative electrode 112 or the last negative electrode 112 forms the first side surface 120 of the stacked assembly 100. In other words, the dimension of the separator 113 along a third direction is not less than the dimension of the first side surface 120 along a third direction.

[0082] In order to enable the insulating film 200 to fully cover the stacked cells 110, in this embodiment, the dimension of the insulating film 200 along the third direction is designed to be larger than the dimension of the separator 113 along the third direction, so that both ends of the insulating film 200 along the third direction can extend beyond the separator 113. When the insulating film 200 can fully cover the separator 113, it can be ensured that the insulating film 200 can achieve full and effective insulation coverage of the stacked cells 110, thereby helping to improve the insulation performance of the battery 1000.

[0083] Based on the same inventive concept and in conjunction with the description of the battery 1000 in the above embodiments, this embodiment provides a battery pack that has the corresponding technical effects of the battery 1000 in the above embodiments, which will not be repeated here.

[0084] Figure 8 A partial cross-sectional diagram of the battery pack is shown.

[0085] like Figure 8 A battery pack includes a base plate 2000 and a battery 1000 as described in the above embodiments, the battery 1000 being fixed to the base plate 2000 and the top surface 140 of the assembly being disposed away from the base plate 2000.

[0086] It should be noted that the battery includes a housing with an opening, a cover assembly 300 that covers the opening connected to the housing, and a stacked assembly 100 disposed within the space formed by the housing and the cover assembly 300.

[0087] It should be noted that the battery 1000 can be fixed to the base plate 2000 by means of snap-fit, adhesive, pressing or fasteners (e.g., screws).

[0088] When assembling the battery pack, the bottom surface 130 of the battery 1000 needs to face the base plate 2000, and correspondingly, the top surface 140 of the component can be set away from the base plate 2000.

[0089] When the battery pack is subjected to vibration and impact, the impact force will be transmitted from the base plate 2000 to the battery 1000. Based on the above, it can be understood that the surface of the insulating film 200 in contact with the bottom surface 130 of the module is a flat surface. Therefore, even if the vibration and impact are transmitted to the bottom surface 130 of the module through the insulating film 200, it is not easy to cause damage to the stacked cells 110 in the stacked module 100.

[0090] Meanwhile, although the surface of the insulating film 200 that contacts the top surface 140 of the module is an uneven surface, the structure of the battery 1000 near the top surface 140 of the module does not directly contact the base plate 2000. Therefore, the vibration and impact on the battery pack will not be directly transmitted to the top surface 140 of the module through the insulating film 200. Thus, the risk of damage to the stacked cells 110 in the stacked module 100 can be effectively reduced.

[0091] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0092] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0093] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0094] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0095] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0096] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: A stacked assembly includes at least one stacked cell. The stacked assembly includes two first side surfaces disposed opposite to each other along a first direction, and a bottom surface and a top surface disposed opposite to each other along a second direction. The first direction is the thickness direction of the stacked cell, and the second direction is perpendicular to the first direction. An insulating film covers the bottom surface of the component, the top surface of the component, and the two first side surfaces; the insulating film includes two first free ends, which are fixed to the top surface of the component and are stacked in at least a portion of the top surface of the component.

2. The battery according to claim 1, characterized in that, The battery includes a cover assembly disposed on the top surface of the assembly away from the bottom surface of the assembly, and the cover assembly includes an explosion-proof valve; Along the second direction, the projection of the explosion-proof valve on the top surface of the component does not overlap with the insulating film.

3. The battery according to claim 2, characterized in that, The first free end of the insulating film is provided with a clearance opening, which corresponds to the explosion-proof valve.

4. The battery according to claim 1, characterized in that, The stacked assembly includes two second side surfaces disposed opposite each other along a third direction, the third direction being perpendicular to the first direction and the second direction; The insulating film extends at least to the second side along the third direction.

5. The battery according to claim 4, characterized in that, The insulating film includes a non-adhesive area disposed along the edge of the second side surface; the insulating film is connected to the laminated assembly by an adhesive layer disposed on the insulating film in areas other than the non-adhesive area.

6. The battery according to claim 1, characterized in that, The stacked assembly includes two second sides disposed opposite to each other along a third direction, and tabs extending from the second sides; The battery includes an adapter and a cover assembly. The adapter includes a first part and a second part that are connected to each other and configured in an L-shape. The cover assembly includes a terminal post. The first part is close to the second side and electrically connected to the tab. The cover assembly is disposed on the top surface of the assembly away from the bottom surface of the assembly. The second part is disposed between the top surface of the assembly and the cover assembly and electrically connected to the terminal post.

7. The battery according to claim 1, characterized in that, Each of the stacked cells includes a plurality of positive electrode plates and a plurality of negative electrode plates arranged alternately in a first direction, and a separator that isolates the positive electrode plates and the negative electrode plates; the separator includes two second free ends, which are bent toward the top surface of the component or the bottom surface of the component.

8. The battery according to claim 7, characterized in that, Along a third direction, the size of the diaphragm is smaller than the size of the insulating film; the third direction is perpendicular to the first direction and the second direction.

9. The battery according to claim 7, characterized in that, The diaphragm is folded in a "Z" shape to form multiple insertion spaces, including a first space and a second space that are alternately arranged along the first direction. The positive electrode is inserted into the first space and the negative electrode is inserted into the second space.

10. A battery pack, characterized in that, It includes a base plate and a battery as claimed in any one of claims 1 to 9, wherein the battery is fixed to the base plate and the top surface of the component is disposed away from the base plate.

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