Battery monomer, manufacturing method of battery monomer, electric equipment and battery production line

Abstract

The invention relates to a battery monomer, a manufacturing method of the battery monomer, electric equipment and a battery production line. The manufacturing method of the battery monomer comprises the following steps: providing a plurality of pole pieces; the pole piece comprises at least one first pole piece part, and the first pole piece part is provided with a large surface; the plurality of pole pieces comprise a target pole piece; and arranging at least one spacer on at least one first pole piece part of the target pole piece. The distance piece is provided with a head end and a tail end which are arranged in a spaced mode in the first direction, and the distance piece is arranged in a lengthwise extending mode from the head end to the tail end. The first direction is parallel to the large surface and is parallel to the width direction of the pole piece. At least a portion of the spacer is dissolvable in the electrolyte within the battery cell. According to the manufacturing method of the battery monomer, electrolyte can easily climb to the pole piece interlayer where the target pole piece is located along the spacer, and the electrolyte infiltration effect of the pole piece interlayer where the target pole piece is located is improved, so that the problems of interface black spots or lithium precipitation and the like are solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a method for manufacturing a battery cell, an electrical device, and a battery production line. Background Art

[0002] The manufacturing process of a battery cell generally includes: a process of pressing the electrode assembly of the battery cell. However, the battery cell in the related art is prone to problems such as interface black spots or lithium deposition. Summary of the invention

[0003] Based on this, it is necessary to provide a battery cell, a method for manufacturing a battery cell, electrical equipment and a battery production line to address the problem that battery cells in the related art are prone to black spots on the interface or lithium deposition.

[0004] According to the first aspect of the present application, a method for manufacturing a battery cell is provided, comprising: providing a plurality of pole pieces; the pole pieces include at least one first pole piece portion, the first pole piece portion having a large surface; the plurality of pole pieces include a target pole piece; and at least one spacer is provided on at least one first pole piece portion of the target pole piece. The spacer has a head end and a tail end spaced apart along a first direction, and the spacer extends longitudinally from the head end to the tail end. The first direction is parallel to the large surface. At least a portion of the spacer can be dissolved in the electrolyte in the battery cell.

[0005] In the technical solution of the present application, before the electrode piece is made into an electrode assembly, at least one spacer is first set on at least one first electrode piece portion of the target electrode piece, so that there is a gap of the thickness of the spacer between the electrode pieces where the target electrode piece is located, and the spacer is longitudinally extended from the head end to the tail end, which is conducive to the electrolyte to crawl along the spacer to the electrode piece layer where the target electrode piece is located, and improve the electrolyte infiltration effect between the electrode pieces where the target electrode piece is located, thereby improving the problems of interface black spots or lithium precipitation. In addition, at least part of the spacer can be dissolved in the electrolyte in the battery cell, and the spacer is equivalent to increasing the injection amount of the electrolyte to a certain extent, and will not cause the spacer to react with the electrolyte in the battery cell, which is conducive to improving the reliability and life of the battery cell.

[0006] In one embodiment, the spacer is longitudinally extended along the first direction.

[0007] Since the first direction is parallel to the width direction of the pole piece, the spacer extending longitudinally along the first direction will not form resistance to the electrolyte along the first direction, which is conducive to the electrolyte climbing smoothly along the spacer, and further helps to improve the electrolyte wetting effect between the pole piece layers where the target pole piece is located, thereby improving problems such as interface black spots or lithium precipitation.

[0008] In one embodiment, the battery cell is a wound battery cell, and the first direction is parallel to the width direction of the pole piece.

[0009] For a wound battery cell, the first direction is parallel to the width direction of the pole piece. Then, usually, during the injection process, the width direction of the pole piece will be parallel to the axial direction of the injection hole. In this way, during the injection process into the wound battery cell, the electrolyte flowing into the bottom of the wound battery cell can climb upward along the spacer, which is convenient for improving the electrolyte wetting effect between the pole piece layers where the target pole piece is located, thereby improving problems such as interface black spots or lithium precipitation.

[0010] In one embodiment, the manufacturing method of the battery cell further includes: providing a shell for mounting a plurality of pole pieces, wherein a liquid injection hole is provided on one side of the shell along a first direction. Along the first direction, the spacer extends from one side of the large surface away from the liquid injection hole toward the other side of the large surface.

[0011] During the process of injecting the electrolyte into the shell through the injection hole on the shell, the multiple pole pieces located in the shell are usually in a vertical position. At this time, the side of the pole piece close to the injection hole (that is, the top of the pole piece is easier to contact with the electrolyte), and the electrolyte will also flow downward along the outside of the electrode assembly under the action of gravity. The side of the pole piece away from the injection hole (that is, the bottom of the pole piece) is also easier to contact with the electrolyte. Extending the spacer from the side of the large surface away from the injection hole to the other side of the large surface is beneficial for the electrolyte at the bottom to infiltrate upward along the pole piece layer where the spacer is located to the middle of the pole piece, which is beneficial to improve the electrolyte infiltration effect between the pole piece layers where the target pole piece is located, thereby improving problems such as interface black spots or lithium precipitation.

[0012] In one embodiment, the size of the large surface along the first direction is H1, and the size of the spacer along the first direction is H2, wherein 1 / 2H1≤H2≤4 / 5H1.

[0013] In this way, it is beneficial for the electrolyte at the bottom to infiltrate upward along the electrode layer where the spacer is located to the height of the center of the electrode and a higher height, and it is also beneficial for the electrolyte to infiltrate downward along the gap formed by the spacer, thereby improving the electrolyte wetting effect of the target electrode, thereby better improving problems such as interface black spots or lithium deposition.

[0014] In one embodiment, along the first direction, the center of the large surface is located between the head end and the tail end.

[0015] The electrolyte can easily contact the top and the bottom of the electrode, while the gas at the center of the large surface of the electrode is squeezed to the middle by the electrolyte on the top and the electrolyte on the bottom, which makes it easy to form a liquid seal at the height of the center of the large surface of the electrode, which makes it difficult for the center of the large surface of the electrode to contact the electrolyte. Based on this, in order to improve the problems of interface black spots or lithium deposition at the height of the center of the large surface, in the present application, the center of the large surface is located between the head end and the tail end, which is conducive to the electrolyte at the bottom to infiltrate upward along the electrode layer where the spacer is located to the height of the center of the electrode and above, thereby improving the electrolyte wetting effect of the target electrode, thereby better improving the problems of interface black spots or lithium deposition.

[0016] In one embodiment, the manufacturing method of the battery cell further includes: providing a shell for mounting a plurality of pole pieces, wherein a liquid injection hole is provided on one side of the shell along a first direction, and a side of the spacer away from the liquid injection hole along the first direction is arranged flush with a side of the large surface thereof away from the liquid injection hole along the first direction.

[0017] The bottom of the spacer is flush with the bottom of the large surface, so that during the injection process, the electrolyte at the bottom can better infiltrate upward along the electrode layers where the spacer is located.

[0018] In one embodiment, at least one spacer is provided on at least one first pole piece portion of the target pole piece, specifically comprising: arranging a plurality of spacers at intervals along a second direction on at least one first pole piece portion of the target pole piece. The first direction and the second direction intersect each other and are both parallel to the large surface.

[0019] The electrolyte at the bottom can better infiltrate upward along the electrode layer where the spacer is located, and can also infiltrate upward or downward through the gap between two adjacent spacers under the capillary action of the electrolyte, thereby better improving the electrolyte wetting effect of the target electrode, thereby better improving problems such as interface black spots or lithium precipitation.

[0020] In one embodiment, the thickness of the spacer is 10µm-50µm.

[0021] The thickness of the spacer needs to be set within a suitable range, such as within the range of 10µm-50µm. This is beneficial for increasing the electrolyte creeping rate so that the electrolyte can creep to the middle and upper parts of the electrode piece more quickly, and can also reduce the difficulty of inserting the electrode assembly into the shell.

[0022] In one embodiment, the material of the spacer includes an electrolyte additive and an adhesive. The electrolyte additive can be dissolved in the electrolyte in the battery cell, and the adhesive is used to bond the spacer to the large surface of the target electrode.

[0023] Adhesives can be used to increase the adhesion of the spacer to the target pole piece, thereby facilitating better use of the spacer to improve the electrolyte wetting effect between the pole piece layers where the target pole piece is located.

[0024] In one embodiment, the spacer includes an electrolyte additive layer and an adhesive layer which are stacked, and the adhesive layer is arranged between the electrolyte additive layer and the large surface of the target electrode.

[0025] In this way, the adhesive layer can be used to improve the adhesion of the spacer to the target electrode, which is conducive to better utilizing the spacer to improve the electrolyte infiltration effect between the electrode layers where the target electrode is located.

[0026] In one embodiment, the thickness of the adhesive layer is 1µm-5µm.

[0027] Setting the thickness of the adhesive layer within an appropriate range is beneficial to improving the adhesion of the spacer to the target electrode, and is also beneficial to improving the quality of the electrolyte additive layer, thereby increasing the injection volume of the electrolyte, and further beneficial to improving the reliability and life of the battery cell.

[0028] In one embodiment, the thickness of the adhesive layer is greater than or equal to one fifth of the thickness of the electrolyte additive layer and less than or equal to one half of the thickness of the electrolyte additive layer.

[0029] The adhesive layer has a certain thickness, so that even when the electrolyte additive layer is dissolved in the electrolyte, a certain distance can be maintained between the electrode layers where the spacers are located, which is beneficial to improving the infiltration effect of the electrolyte.

[0030] In one embodiment, the manufacturing method of the battery cell further includes: providing a shell for mounting a plurality of pole pieces, wherein a liquid injection hole is provided on one side of the shell along a first direction. Along the first direction, the head end is arranged farther away from the liquid injection hole than the tail end. The size of the head end along the second direction is smaller than the size of the tail end along the second direction. The first direction and the second direction intersect each other and are both parallel to the large surface.

[0031] Since the size of the head end along the second direction is smaller than the size of the tail end along the second direction, the spacer has a structure that is wide at the top and narrow at the bottom. In this way, in the process of injecting electrolyte into the outer shell through the injection hole, the electrolyte flowing into the bottom of the outer shell can climb upward along the spacer more, so that the electrolyte can quickly infiltrate more positions, which is beneficial to improve the wetting effect of the electrolyte, thereby better improving problems such as interface black spots or lithium precipitation.

[0032] In one of the embodiments, the size of the spacer along the second direction gradually increases from one side of the large surface away from the injection hole to the other side of the large surface.

[0033] In this way, the electrolyte can quickly penetrate into more locations and can also climb up along the spacer, which is beneficial to improve the wetting effect of the electrolyte, thereby better improving problems such as interface black spots or lithium precipitation.

[0034] In one embodiment, the manufacturing method of the battery cell further includes: providing a shell for mounting a plurality of pole pieces, wherein a liquid injection hole is provided on one side of the shell along a first direction. Along the first direction, the head end is arranged farther from the liquid injection hole than the tail end. The thickness of the head end is greater than the thickness of the tail end.

[0035] It can be understood that the spacer has a thick bottom and thin top structure. The spacer forms a sufficient gap at the head end, which can increase the interlayer spacing of the electrode at the bottom. The electrolyte at the bottom can climb upward more and faster, reducing the situation where the bridge is broken and cannot be connected to embed lithium due to excessive thickness in the middle. It can effectively improve the abnormal interface of the battery cell and reduce the probability of safety accidents.

[0036] In one embodiment, the thickness of the spacer gradually decreases along the direction from the head end to the tail end.

[0037] The thickness of the spacer tends to decrease gradually. On the one hand, the electrolyte at the bottom can climb up more and faster. On the other hand, the spacing between the layers where the spacer is located is also gradually reduced, which is conducive to the formation of negative pressure. The electrolyte climbs up faster under the capillary action of the electrolyte and the negative pressure, which is beneficial to the overall full infiltration of the electrode, and thus can better improve problems such as interface black spots or lithium precipitation.

[0038] In one embodiment, the first pole piece portion provided with the spacer is defined as the target pole piece portion; among the plurality of pole pieces, the spacers on at least two target pole pieces are staggered along the second direction. The first direction and the second direction intersect each other and are both parallel to the large surface.

[0039] On the one hand, each spacer can be used to increase the spacing between the pole piece layers of the corresponding target pole piece portion, thereby improving the wetting effect of the electrolyte, and further improving problems such as interface black spots or lithium deposition; on the other hand, the spacers on at least two target pole piece portions are staggered along the second direction, which can reduce the overlapping portion between the spacers on at least two target pole piece portions, thereby reducing the difficulty of inserting the electrode assembly into the shell.

[0040] In one of the embodiments, among the plurality of pole pieces, the spacers on any two target pole pieces are staggered along the second direction.

[0041] In this way, the wetting effect of the electrolyte can be improved while taking into account the size of the electrode assembly along the thickness direction of the electrode sheet, which can better reduce the difficulty of inserting the electrode assembly into the shell and reduce the influence of the spacer on the group margin of the electrode assembly.

[0042] In one of the embodiments, among the plurality of pole pieces, the orthographic projections of the spacers on at least two target pole piece portions in the reference plane do not overlap with each other, wherein the reference plane is parallel to the large surface.

[0043] While improving the wetting effect of the electrolyte, it can also better reduce the difficulty of inserting the electrode assembly into the shell, and can also reduce the influence of the spacer on the group margin of the electrode assembly.

[0044] In one of the embodiments, among the plurality of pole pieces, the orthographic projections of the spacers on any two target pole pieces in the reference plane do not overlap with each other.

[0045] While improving the wetting effect of the electrolyte, it can also better reduce the difficulty of inserting the electrode assembly into the shell, and can also reduce the influence of the spacer on the group margin of the electrode assembly.

[0046] In one embodiment, the plurality of pole pieces include a first pole piece and a second pole piece, and at least one of the first pole piece and the second pole piece is a target pole piece. The method for manufacturing a battery cell further includes: providing at least one isolating member, the isolating member having at least one isolating portion corresponding to at least one first pole piece portion. The first pole piece portion and the isolating portion are stacked, and the plurality of pole pieces and the at least one isolating member are pressed together to form an electrode assembly. The first pole piece and the second pole piece are separated by the corresponding isolating portion.

[0047] In this way, the electrolyte infiltration effect of at least one of the first pole piece and the second pole piece can be improved, and the reliability of the electrode assembly can be improved.

[0048] According to a second aspect of the present application, a battery cell is provided, which is manufactured using the manufacturing method of the battery cell of any of the above embodiments.

[0049] According to a third aspect of the present application, there is provided an electrical device, comprising a battery device, wherein the battery device comprises the above-mentioned battery cell.

[0050] According to a fourth aspect of the present application, a battery production line is provided, the battery production line is used to manufacture battery cells, the battery production line includes a first providing mechanism and a second providing mechanism, the first providing mechanism is used at least to provide a plurality of pole pieces; wherein the pole piece includes at least one first pole piece portion, the first pole piece portion has a large surface; the plurality of pole pieces include a target pole piece. The second providing mechanism is used to set at least one spacer on at least one first pole piece portion of the target pole piece. wherein the spacer has a head end and a tail end spaced apart along a first direction, and the spacer extends longitudinally from the head end to the tail end. the first direction is parallel to the large surface. at least part of the spacer can be dissolved in the electrolyte in the battery cell.

[0051] The battery cells manufactured using this battery production line have better electrolyte infiltration effects and can improve problems such as interface black spots or lithium precipitation.

[0052] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0054] Figure 1 A schematic structural diagram of a vehicle according to an embodiment of the present application is shown.

[0055] Figure 2 A schematic structural diagram of a battery device according to an embodiment of the present application is shown.

[0056] Figure 3 A schematic diagram showing the structure of an electrode assembly according to an embodiment of the present application is shown ( Figure 3 A schematic diagram of the structure before the electrode assembly is assembled into the housing is given).

[0057] Figure 4 Shows Figure 3 main view.

[0058] Figure 5 Shows Figure 3 Schematic diagram of the local structure of the electrode assembly shown.

[0059] Figure 6 A side view of a spacer according to an embodiment of the present application is shown.

[0060] Figure 7 A front view of an electrode assembly according to another embodiment of the present application is shown.

[0061] Figure 8 A side view of a spacer according to another embodiment of the present application is shown.

[0062] Fig. 9 A top view of an electrode assembly according to an embodiment of the present application is shown.

[0063] Fig.10 A top view of an electrode assembly according to another embodiment of the present application is shown.

[0064] Fig.11 A schematic structural diagram of a first providing mechanism and a second providing mechanism according to an embodiment of the present application is shown.

[0065] 1. Vehicle; 10. Battery device; 100. Battery cell; 110. Pole piece; 111. First pole piece portion; 1111. Large surface; 112. First pole piece; 113. Second pole piece; 120. Spacer; 1201. Head end; 1202. Tail end; 121. Electrolyte additive layer; 122. Adhesive layer; 123. Liquid creeping side wall; T. Liquid creeping channel; 130. Isolator; 131. Isolation portion; 1101. Electrode assembly; 200. Box shell; 210. Box cover; 220. Box body; 20. Motor; 30. Controller; 40. First providing mechanism; 410. First sub-providing mechanism; 420. Second sub-providing mechanism; 430. Third sub-providing mechanism; 411. First guide roller; 412. Second guide roller; 431. Third guide roller; 432. Fourth guide roller; 50. Second providing mechanism. DETAILED DESCRIPTION

[0066] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0067] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0068] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0070] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0071] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0072] In the related art, the manufacturing process of battery cells usually includes: the process of pressing the electrode assembly of the battery cell, which will result in a smaller interlayer spacing of the electrode sheets, thereby affecting the wetting effect of the electrode sheets, and further causing the battery cells in the related art to be prone to problems such as interface black spots or lithium deposition.

[0073] In order to solve the above technical problems, the present application designs a battery cell, a method for manufacturing a battery cell, an electrical equipment and a battery production line, which can use spacers to increase the interlayer spacing of the electrode sheets, thereby improving the electrolyte infiltration effect between the electrode sheets, and can also improve problems such as interface black spots or lithium plating.

[0074] The battery cells and / or battery devices manufactured by the manufacturing method of the battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical equipment such as vehicles, ships or aircraft. Electrical equipment may be, but not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships and spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc. The power supply system of the electrical equipment can be composed of the battery cells and / or battery devices disclosed in the present application, so that it is convenient to provide electric drive for the electrical equipment and the service life of the electrical equipment can be increased.

[0075] Figure 1 A schematic structural diagram of a vehicle 1 according to an embodiment of the present application is shown. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is arranged inside the vehicle 1. For example, a battery device 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery device 10 may be used to power the vehicle 1. For example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, such as for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery device 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 1.

[0076] A motor 20 and a controller 30 may also be provided inside the vehicle 1 . The controller 30 is used to control the battery device 10 to supply power to the motor 20 , for example, to meet the power requirements for starting, navigating, and driving the vehicle 1 . Figure 2 A schematic structural diagram of a battery device 10 according to an embodiment of the present application is shown.

[0077] The battery device 10 includes at least one battery cell 100. In order to meet different power usage requirements, the battery device 10 may include multiple battery cells 100, and the battery cell 100 refers to the smallest unit that constitutes the battery device 10. Multiple battery cells 100 can be connected in series and / or in parallel via electrode terminals for application in various applications. The battery device 10 mentioned in the present application includes a battery module or a battery pack. Among them, multiple battery cells 100 can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series and parallel connection. The battery device 10 can also be called a battery pack. In the embodiment of the present application, multiple battery cells 100 can directly form a battery pack, or they can first form a battery module, and then the battery modules can form a battery pack.

[0078] like Figure 2As shown, the battery device 10 may also include a box shell 200, and all battery cells 100 are accommodated in the box shell 200. Specifically, the box shell 200 may include a box body 220 and a box cover 210, and the box cover 210 is detachably connected to the box body 220 so that all battery cells 100 can be accommodated in the box shell 200.

[0079] The battery cell 100 may include an electrode assembly and a housing (not shown). Figure 3 A schematic diagram showing the structure of an electrode assembly 1101 according to an embodiment of the present application is shown ( Figure 3 A schematic diagram of the structure before the electrode assembly 1101 is assembled into the housing is given). Figure 4 Shows Figure 3 The main view, Figure 5 Shows Figure 3 A schematic diagram of the partial structure of the electrode assembly 1101 is shown.

[0080] Please refer to Figure 3-Figure 5 An embodiment of the present application provides a method for manufacturing a battery cell, comprising the following steps:

[0081] S10. Provide a plurality of pole pieces.

[0082] The pole piece 110 includes at least one first pole piece portion 111, and the first pole piece portion 111 has a large surface 1111. The plurality of pole pieces 110 include a target pole piece.

[0083] The battery cell 100 may be a laminated battery cell or a wound battery cell, which is not particularly limited herein.

[0084] If the battery cell 100 is a laminated battery cell, each pole piece 110 includes a first pole piece portion 111 .

[0085] If the battery cell 100 is a wound battery cell, there are two pole pieces 110 , the two pole pieces 110 have opposite polarities, and each pole piece 110 includes a plurality of first pole piece portions 111 spaced apart along the thickness direction of the pole piece 110 .

[0086] The first pole piece portion 111 refers to a portion of the pole piece 110 having a large surface 1111 , and the large surface 1111 refers to a surface on the first pole piece portion 111 that is perpendicular to the thickness direction of the pole piece 110 , and the large surface 1111 is larger in area than other side surfaces on the electrode assembly.

[0087] The target pole piece refers to a pole piece 110 among the plurality of pole pieces 110 for setting the spacer 120 described below.

[0088] S20, disposing at least one spacer on at least one first pole piece portion of the target pole piece.

[0089] The spacer 120 has a head end 1201 and a tail end 1202 spaced apart along a first direction F1. The spacer 120 extends longitudinally from the head end 1201 to the tail end 1202. The first direction F1 is parallel to the large surface 1111. At least a portion of the spacer 120 can be dissolved in the electrolyte in the battery cell 100.

[0090] The spacer 120 refers to a component that is disposed on the large surface 1111 of the first pole piece portion 111 of the target pole piece and is used to increase the distance between pole piece layers.

[0091] The leading end 1201 and the trailing end 1202 refer to two ends of the spacer 120 spaced apart along the first direction F1 .

[0092] “At least a portion of the spacer 120 is soluble in the electrolyte in the battery cell 100 ” may mean: a portion of the spacer 120 is soluble in the electrolyte in the battery cell 100 ; or: the spacer 120 is soluble in the electrolyte in the battery cell 100 .

[0093] It may be that among the multiple first pole piece portions 111 of the target pole piece, at least one spacer 120 is provided on each first pole piece portion 111; it may also be that among all the first pole piece portions 111 of the target pole piece, at least one spacer 120 is provided on each first pole piece portion 111; it may also be that at least one spacer 120 is provided on the first pole piece portion 111 of the target pole piece.

[0094] The first direction F1 is parallel to the large surface 1111 . It can be understood that the first direction F1 is perpendicular to the thickness direction of the pole piece 110 .

[0095] A liquid injection hole is provided on one side of the housing along the first direction F1. If the battery cell 100 is a laminated battery cell, the first direction F1 may be parallel to the width direction of the pole piece 110 or the length direction of the pole piece 110, which is not specifically limited here.

[0096] If the battery cell 100 is a wound battery cell, the first direction F1 is parallel to the width direction of the pole piece 110. The width direction of the pole piece 110 is perpendicular to the thickness direction of the pole piece 110 and perpendicular to the length direction of the pole piece 110. When the pole piece 110 is transported to the winding station to be wound to form a wound battery cell, the length direction of the pole piece 110 is parallel to the transport direction of the pole piece 110.

[0097] In this way, before the electrode piece 110 is made into an electrode assembly, at least one spacer 120 is first set on at least one first electrode piece portion 111 of the target electrode piece, so that the electrode piece layers where the target electrode piece is located have a gap of the thickness of the spacer 120, and the spacer 120 is longitudinally extended from the head end 1201 to the tail end 1202, which is conducive to the electrolyte to crawl along the spacer 120 to the electrode piece layers where the target electrode piece is located, improve the electrolyte infiltration effect between the electrode piece layers where the target electrode piece is located, thereby improving problems such as interface black spots or lithium precipitation. In addition, at least part of the spacer 120 can be dissolved in the electrolyte in the battery cell 100. The spacer 120 is equivalent to increasing the injection amount of the electrolyte to a certain extent, and will not cause the spacer 120 to react with the electrolyte in the battery cell 100, which is conducive to improving the reliability and life of the battery cell 100.

[0098] In some embodiments, the spacer 120 is disposed to extend lengthwise along the first direction F1 .

[0099] Since the first direction F1 is parallel to the width direction of the pole piece 110, the spacer 120 extending longitudinally along the first direction F1 will not form resistance to the electrolyte along the first direction F1, which is conducive to the electrolyte to smoothly crawl along the spacer 120, and further helps to improve the electrolyte wetting effect between the pole piece layers where the target pole piece is located, thereby improving problems such as interface black spots or lithium precipitation.

[0100] In some embodiments, the battery cell 100 is a wound battery cell, and the first direction F1 is parallel to the width direction of the pole piece 110 .

[0101] For a wound battery cell, the first direction F1 is parallel to the width direction of the pole piece 110. Then, usually, during the injection process, the width direction of the pole piece 110 will be parallel to the axial direction of the injection hole. In this way, during the injection process into the wound battery cell, the electrolyte flowing into the bottom of the wound battery cell can climb upward along the spacer 120, so as to improve the electrolyte wetting effect between the pole piece layers where the target pole piece is located, thereby improving problems such as interface black spots or lithium precipitation.

[0102] In some embodiments, the manufacturing method of the battery cell 100 further includes: providing a shell for mounting a plurality of pole pieces 110, wherein a liquid injection hole is provided on one side of the shell along the first direction F1. Along the first direction F1, the spacer 120 is extended from one side of the large surface 1111 away from the liquid injection hole toward the other side of the large surface 1111.

[0103] During the process of injecting the electrolyte into the shell through the injection hole on the shell, the multiple pole pieces 110 located in the shell are usually in a vertical position. At this time, the side of the pole piece 110 close to the injection hole (that is, the top of the pole piece 110 is easier to contact with the electrolyte), and the electrolyte will also flow downward along the outside of the electrode assembly 1101 under the action of gravity. The side of the pole piece 110 away from the injection hole (that is, the bottom of the pole piece 110) is also easier to contact with the electrolyte. The spacer 120 is extended from the side of the large surface 1111 away from the injection hole to the other side of the large surface 1111, which is conducive to the electrolyte at the bottom to infiltrate upward along the pole piece layer where the spacer 120 is located to the middle of the pole piece 110, which is conducive to improving the electrolyte infiltration effect between the pole piece layers where the target pole piece is located, thereby improving problems such as interface black spots or lithium precipitation.

[0104] In some embodiments, a size of the large surface 1111 along the first direction F1 is H1, and a size of the spacer 120 along the first direction F1 is H2, wherein 1 / 2H1≤H2≤4 / 5H1.

[0105] For example, H2 may be 1 / 2H1, 2 / 3H1, or 4 / 5H1, etc.

[0106] In this way, it is beneficial for the electrolyte at the bottom to infiltrate upward along the electrode layer where the spacer 120 is located to the height of the center of the electrode 110 and a higher height, and it is also beneficial for the electrolyte to infiltrate downward along the gap formed by the spacer 120, thereby improving the electrolyte wetting effect of the target electrode, thereby better improving problems such as interface black spots or lithium deposition.

[0107] In some embodiments, along the first direction F1 , the center of the large surface 1111 is located between the head end 1201 and the tail end 1202 .

[0108] It can be understood that in the first direction F1 , the height of the spacer 120 is not lower than the height of the center of the large surface 1111 .

[0109] As described above, the electrolyte can easily contact the top and the bottom of the electrode piece 110, while the gas at the height of the center of the large surface 1111 of the electrode piece 110 is squeezed to the middle by the electrolyte on the top and the electrolyte on the bottom, which makes it easy to form a liquid seal at the height of the center of the large surface 1111 of the electrode piece 110, which makes it difficult for the center of the large surface 1111 of the electrode piece 110 to contact the electrolyte. Based on this, in order to improve the problems of interface black spots or lithium deposition at the height of the center of the large surface 1111, in the present application, the center of the large surface 1111 is located between the head end 1201 and the tail end 1202, which is conducive to the electrolyte at the bottom to infiltrate upward along the electrode layer where the spacer 120 is located to the height of the center of the electrode piece 110 and above, thereby improving the electrolyte wetting effect of the target electrode, thereby better improving the problems of interface black spots or lithium deposition.

[0110] In some embodiments, the manufacturing method of the battery cell 100 further includes: providing a shell for mounting a plurality of pole pieces 110, wherein a liquid injection hole is provided on one side of the shell along the first direction F1. A side of the spacer 120 away from the liquid injection hole along the first direction is arranged flush with a side of the large surface 1111 away from the liquid injection hole along the first direction.

[0111] The bottom of the spacer 120 is flush with the bottom of the large surface 1111 , so that during the injection process, the electrolyte at the bottom can better infiltrate upward along the electrode layers where the spacer 120 is located.

[0112] In some embodiments, at least one spacer 120 is disposed on at least one first pole piece portion 111 of the target pole piece, specifically comprising:

[0113] S21 , a plurality of spacers 120 are arranged at intervals along the second direction F2 on at least one first pole piece portion 111 of the target pole piece, the first direction F1 and the second direction F2 intersect each other and are both parallel to the large surface 1111 .

[0114] The electrolyte at the bottom can better infiltrate upward along the electrode layer where the spacer 120 is located, and can also infiltrate upward or downward through the gap between two adjacent spacers 120 under the capillary action of the electrolyte, thereby better improving the electrolyte infiltration effect of the target electrode, thereby better improving problems such as interface black spots or lithium precipitation.

[0115] It can be understood that a creeping liquid channel T is defined between two adjacent spacers 120 .

[0116] In some embodiments, the thickness of the spacer 120 is 10 μm-50 μm.

[0117] For example, the thickness of the spacer 120 may be 10 μm, 20 μm, 30 μm, 40 μm, or 50 μm.

[0118] The thickness of the spacer 120 can be selected comprehensively based on factors such as the contact angle of the electrolyte, the optimal pore size during capillary action, and the viscosity of the electrolyte. Therefore, the thickness of the spacer 120 needs to be set within a suitable range, such as within the range of 10µm-50µm. This is beneficial for increasing the creeping rate of the electrolyte so that the electrolyte can creep more quickly to the middle and upper parts of the electrode piece 110, and can also reduce the difficulty of inserting the electrode assembly 1101 into the shell.

[0119] In some embodiments, the material of the spacer 120 includes an electrolyte additive and an adhesive. The electrolyte additive can be dissolved in the electrolyte in the battery cell 100 , and the adhesive is used to bond the spacer 120 to the large surface 1111 of the target electrode.

[0120] The electrolyte additive refers to an additive that can be dissolved in the electrolyte in the battery cell 100 , and can be a part of the electrolyte, such as a solvent in the electrolyte, or can be other additives that do not react with the electrolyte.

[0121] Illustratively, the electrolyte additive is 1,3-propane sultone, ethylene carbonate (EC), or dimethyl carbonate.

[0122] The adhesive refers to a substance that can make the spacer 120 adhere to the large surface 1111 of the target electrode, and for example, the adhesive is polyvinylidene fluoride, polyacrylic acid or styrene-butadiene rubber, etc. The adhesive does not react with the electrolyte in the battery cell 100 .

[0123] It can be that the electrolyte additive and the adhesive are mixed together and then disposed on the large surface 1111 of the target electrode by coating or pasting; it can also be that the electrolyte additive is disposed on the large surface 1111 of the target electrode by means of an adhesive.

[0124] In this way, the adhesive can be used to improve the adhesion of the spacer 120 to the target electrode, which is conducive to better utilizing the spacer 120 to improve the electrolyte infiltration effect between the electrode layers where the target electrode is located.

[0125] In some embodiments, Figure 6 As shown, the spacer 120 includes an electrolyte additive layer 121 and an adhesive layer 122 which are stacked, and the adhesive layer 122 is arranged between the electrolyte additive layer 121 and the large surface 1111 of the target electrode.

[0126] It can be understood that the material of the electrolyte additive layer 121 includes electrolyte additives, and the material of the adhesive layer 122 includes adhesive.

[0127] In this way, the adhesive layer 122 can be used to improve the adhesion of the spacer 120 to the target electrode, which is conducive to better utilizing the spacer 120 to improve the electrolyte infiltration effect between the electrode layers where the target electrode is located.

[0128] In some embodiments, the thickness of the adhesive layer 122 is 1 μm-5 μm.

[0129] Illustratively, the thickness of the adhesive layer 122 is 1 µm, 2 µm, 3 µm, 4 µm, or 5 µm.

[0130] Setting the thickness of the adhesive layer 122 within a suitable range is beneficial to improving the adhesion of the spacer 120 to the target electrode, and is also beneficial to improving the quality of the electrolyte additive layer 121, thereby increasing the injection amount of the electrolyte, and further beneficial to improving the reliability and life of the battery cell 100.

[0131] In other embodiments, the thickness of the adhesive layer 122 is greater than or equal to one fifth of the thickness of the electrolyte additive layer 121 , and less than or equal to one half of the thickness of the electrolyte additive layer 121 .

[0132] For example, the thickness of the adhesive layer 122 is one-fifth, one-quarter, one-third, or one-half of the thickness of the electrolyte additive layer 121 .

[0133] The adhesive layer 122 has a certain thickness, so that even when the electrolyte additive layer 121 is dissolved in the electrolyte, a certain distance can be maintained between the electrode layers where the spacer 120 is located, which is beneficial to improving the infiltration effect of the electrolyte.

[0134] In some embodiments, the method for manufacturing a battery cell further includes: providing a housing for mounting a plurality of pole pieces.

[0135] A liquid injection hole is provided on one side of the housing along the first direction F1. Along the first direction F1, compared with one of the head end 1201 and the tail end 1202, the other of the head end 1201 and the tail end 1202 is disposed closer to the liquid injection hole.

[0136] Take “along the first direction F1, compared with the tail end 1202, the head end 1201 is further away from the injection hole” as an example for explanation. Figure 7 As shown, the dimension of the head end 1201 along the second direction F2 is smaller than the dimension of the tail end 1202 along the second direction F2. The first direction F1 and the second direction F2 intersect each other and are both parallel to the large surface 1111.

[0137] The first direction F1 and the second direction F2 may be perpendicular to each other. Specifically, the second direction F2 is parallel to the length direction of the pole piece 110 .

[0138] Since the size of the head end 1201 along the second direction F2 is smaller than the size of the tail end 1202 along the second direction F2, the spacer 120 has a structure that is wide at the top and narrow at the bottom. In this way, in the process of injecting electrolyte into the outer shell through the injection hole, the electrolyte flowing into the bottom of the outer shell can climb upward along the spacer 120 more, so that the electrolyte can quickly infiltrate more positions, which is beneficial to improve the wetting effect of the electrolyte, thereby better improving problems such as interface black spots or lithium precipitation.

[0139] In some embodiments, along a side of the large surface 1111 away from the injection hole toward another side of the large surface 1111 , a size of the spacer 120 along the second direction F2 gradually increases.

[0140] In this way, the electrolyte can quickly infiltrate more locations and can also climb up along the spacer 120, which is beneficial to improve the infiltration effect of the electrolyte, thereby better improving problems such as interface black spots or lithium precipitation.

[0141] In some embodiments, the spacer 120 has a creeping side wall 123, which is arranged at an angle to the first direction F1 and the second direction F2. The angle between the creeping side wall 123 and the first direction F1 is a first angle, which is greater than 0 degrees and less than or equal to 5 degrees.

[0142] Illustratively, the angle between the creeping side wall 123 and the first direction F1 is 1 degree, 2 degrees, 3 degrees, 4 degrees or 5 degrees.

[0143] The creeping liquid channel T is formed between the creeping liquid side walls 123 of two adjacent spacers 120 .

[0144] The angle between the creeping side wall 123 and the first direction F1 is controlled within a small range, which means that the inclination of the creeping side wall 123 relative to the first direction F1 is small, which reduces the resistance of the creeping side wall 123 to the electrolyte and also facilitates the electrolyte to quickly penetrate into more locations.

[0145] In some embodiments, “along the first direction F1, compared with the tail end 1202, the head end 1201 is further away from the injection hole” is used as an example for explanation. Figure 8 As shown, the thickness of the head end 1201 is greater than the thickness of the tail end 1202 .

[0146] It can be understood that the spacer 120 has a thick bottom and thin top structure. The spacer 120 forms a sufficient gap at the head end 1201, which can increase the interlayer spacing of the electrode 110 at the bottom. The electrolyte at the bottom can climb upward more and faster, reducing the situation where the bridge is broken and cannot be connected to embed lithium due to excessive thickness in the middle. It can effectively improve the abnormal interface of the battery cell and reduce the probability of safety accidents.

[0147] In some embodiments, the thickness of the spacer 120 gradually decreases along the direction from the head end 1201 to the tail end 1202 .

[0148] The thickness of the spacer 120 tends to decrease gradually. On the one hand, the electrolyte at the bottom can climb upward more and faster. On the other hand, the interval between the layers where the spacer 120 is located also gradually decreases, which is conducive to forming a negative pressure. The electrolyte climbs upward faster under the capillary action of the electrolyte and the negative pressure, which is beneficial to fully wet the entire electrode 110, and can better improve problems such as interface black spots or lithium precipitation.

[0149] In some embodiments, Fig. 9 As shown, the first pole piece 111 provided with the spacer 120 is defined as the target pole piece, and the spacers 120 on at least two target pole pieces of the plurality of pole pieces 110 are staggered along the second direction F2. The first direction F1 and the second direction F2 intersect each other and are both parallel to the large surface 1111.

[0150] On the one hand, each spacer 120 can be used to increase the spacing between the pole pieces of the corresponding target pole piece portion, thereby improving the wetting effect of the electrolyte, and further improving problems such as interface black spots or lithium deposition; on the other hand, the spacers 120 on at least two target pole pieces are staggered along the second direction F2, which can reduce the overlapping portion between the spacers 120 on at least two target pole pieces, thereby reducing the difficulty of inserting the electrode assembly 1101 into the shell.

[0151] In some embodiments, among the plurality of pole pieces 110 , the spacers 120 on any two target pole pieces are arranged offset F2 along the second direction.

[0152] In this way, while improving the wetting effect of the electrolyte, the size of the electrode assembly 1101 along the thickness direction of the electrode piece 110 can also be taken into consideration, which can better reduce the difficulty of inserting the electrode assembly 1101 into the shell and reduce the influence of the spacer 120 on the group margin of the electrode assembly 1101.

[0153] In some embodiments, among the plurality of pole pieces 110 , the orthographic projections of the spacers 120 on at least two target pole pieces in the reference plane do not overlap each other. The reference plane is parallel to the large surface 1111 .

[0154] While improving the wetting effect of the electrolyte, the difficulty of inserting the electrode assembly 1101 into the shell can be better reduced, and the influence of the spacer 120 on the group margin of the electrode assembly 1101 can be reduced.

[0155] In some embodiments, among the plurality of pole pieces 110 , the orthographic projections of the spacers 120 on any two target pole pieces in the reference plane do not overlap with each other.

[0156] While improving the wetting effect of the electrolyte, the difficulty of inserting the electrode assembly 1101 into the shell can be better reduced, and the influence of the spacer 120 on the group margin of the electrode assembly 1101 can be reduced.

[0157] Of course, the present application is not limited thereto. As long as the electrode assembly 1101 can be assembled into the housing, it may also be, for example, Fig.10 As shown, among the plurality of pole pieces 110, the orthographic projections of two adjacent spacers 120 on two adjacent target pole pieces overlap each other in the reference plane. Fig.10 In the embodiment shown, the distance between two adjacent spacers 120 on the same target pole piece is along the second direction F 2 The spacing is 10µm-50µm, which is conducive to the upward infiltration of the electrolyte under the capillary action of the electrolyte, thereby increasing the electrolyte creeping rate, so that the electrolyte can creep more quickly to the middle and upper parts of the electrode 110, thereby improving the electrolyte infiltration effect.

[0158] In some embodiments, the plurality of pole pieces 110 include a first pole piece 112 and a second pole piece 113 , and at least one of the first pole piece 112 and the second pole piece 113 is a target pole piece.

[0159] The method for manufacturing the battery cell 100 further includes:

[0160] S30, providing at least one isolation element.

[0161] The isolation member 130 has at least one isolation portion 131 corresponding to at least one first pole piece portion 111 .

[0162] The isolating member 130 may be an isolating film, or the isolating member 130 may be a whole including a plurality of isolating portions 131 ; or a plurality of isolating members 130 may be provided, with each isolating member 130 being provided with an isolating portion 131 . No specific limitation is made here.

[0163] S40, stacking the first pole piece portion and the isolation portion, and pressing a plurality of pole pieces and at least one isolation member to form an electrode assembly.

[0164] The electrode assembly 1101 may be of a laminated type, so as to subsequently form a laminated battery cell or a wound type; the electrode assembly 1101 may also be of a wound type, so as to subsequently form a wound battery cell, which is specifically limited here.

[0165] The first pole piece 112 and the second pole piece 113 are separated by corresponding isolation portions 131 .

[0166] For example, the first pole piece 112 is the target pole piece, and one of the first pole piece 112, the second pole piece 113 and the insulating member 130 is provided respectively. The electrode assembly 1101 is of a wound type, and the first pole piece portion 111 of the first pole piece 112, the insulating member 131 of the insulating member 130 and the first pole piece portion 111 of the second pole piece 113 are stacked, and the first pole piece 112, the insulating member 130 and the second pole piece 113 are wound in a preset winding manner, and the first pole piece 112, the second pole piece 113 and the insulating member 130 are pressed together to form the electrode assembly 1101.

[0167] Of course, the present application is not limited to this, and it may also be that the first pole piece 112 and the second pole piece 113 are both target pole pieces, and the spacer 120 on the first pole piece 112 and the spacer 120 on the second pole piece 113 are staggered along the second direction F2, and even the orthographic projections of the spacer 120 on the first pole piece 112 and the spacer 120 on the second pole piece 113 in the reference plane do not overlap each other.

[0168] In this way, the electrolyte infiltration effect of the first electrode piece 112 and the second electrode piece 113 can be improved, and the difficulty of inserting the electrode assembly 1101 into the shell can be reduced.

[0169] The method for manufacturing the battery cell 100 further includes:

[0170] S50, installing the electrode assembly into the housing.

[0171] S60, injecting electrolyte into the housing through the injection hole.

[0172] During the injection process, due to the setting of the spacer 120, the electrolyte on the top can creep to the middle of the electrode 110 through the interlayer gap formed by the spacer 120 under the action of gravity, and the electrolyte on the bottom can creep to the middle of the electrode 110 through the interlayer gap formed by the spacer 120 under the capillary action of the electrolyte, so that the electrode 110 is fully infiltrated as a whole, thereby better improving problems such as interface black spots or lithium precipitation.

[0173] An embodiment of the present application provides a battery cell 100 , which is manufactured using the manufacturing method of the battery cell 100 of any of the above embodiments.

[0174] It should be noted that in the battery cell 100 of the present application, since the spacer 120 provided during the process of manufacturing the battery cell 100 can allow the electrolyte to better infiltrate the electrode layers of the electrode assembly 1101, even if the spacer 120 is at least partially dissolved in the electrolyte, the spacing between the electrode layers of the electrode assembly 1101 of the battery cell 100 finally prepared is larger (larger than the spacing between the electrode layers of the battery cell without the spacer 120), which can better improve problems such as interface black spots or lithium plating.

[0175] An embodiment of the present application provides an electric device, including a battery device 10 , wherein the battery device 10 includes the above-mentioned battery cell 100 .

[0176] An embodiment of the present application provides a battery production line, which is used to manufacture battery cells 100. The battery production line includes a first providing mechanism 40 and a second providing mechanism 50 (such as Fig.11 As shown), the first providing mechanism 40 is used to provide a plurality of pole pieces 110; wherein the pole piece 110 includes at least one first pole piece portion 111, and the first pole piece portion 111 has a large surface 1111; the plurality of pole pieces 110 include a target pole piece.

[0177] The second providing mechanism 50 is used to set at least one spacer 120 on at least one first pole piece portion 111 of the target pole piece. The spacer 120 has a head end 1201 and a tail end 1202 arranged opposite to each other along a first direction, and the spacer 120 extends longitudinally from the head end 1201 to the tail end 1202. The first direction F1 is parallel to the large surface 1111. At least part of the spacer 120 can be dissolved in the electrolyte in the battery cell 100.

[0178] Specifically, the plurality of pole pieces 110 include a first pole piece 112 and a second pole piece 113, both of which are target pole pieces. The first providing mechanism 40 includes a first sub-providing mechanism 410, a second sub-providing mechanism 420 and a third sub-providing mechanism 430. The first sub-providing mechanism 410 is used to provide the first pole piece 112, the second sub-providing mechanism 420 is used to provide the second pole piece 113, and the third sub-providing mechanism 430 is used to provide the insulating member 130. At least two second providing mechanisms 50 are provided. Taking two second providing mechanisms 50 as an example for explanation, one of the second providing mechanisms 50 is used to set at least one spacer 120 on at least one first pole piece portion 111 of the first pole piece 112, and the other second providing mechanism 50 is used to set at least one spacer 120 on at least one first pole piece portion 111 of the second pole piece 113.

[0179] For example, the first sub-providing mechanism 410 and the second sub-providing mechanism 420 each include two first guide rollers 411 and one second guide roller 412, and the two first guide rollers 411 rotate in opposite directions to clamp and convey the first electrode sheet 112 or the second electrode sheet 113. The second guide roller 412 of the first sub-providing mechanism 410 is used to guide the first electrode sheet 112 to be conveyed toward the winding station, and the second guide roller 412 of the second sub-providing mechanism 420 is used to guide the second electrode sheet 113 to be conveyed toward the winding station. The third sub-providing mechanism 430 includes two third guide rollers 431 and one fourth guide roller 432, and the two third guide rollers 431 rotate in opposite directions to clamp and convey the isolation member 130, and the fourth guide roller 432 is used to guide the isolation member 130 to be conveyed toward the winding station. In this way, the first electrode sheet 112, the isolation member 130 and the second electrode sheet 113 can be wound at the winding station so as to subsequently form a wound electrode assembly 1101.

[0180] The second providing mechanism 50 is arranged between the first guide roller 411 and the second guide roller 412, so that one of the second providing mechanisms 50 is used to set at least one spacer 120 on at least one first pole piece portion 111 of the first pole piece 112, and the other second providing mechanism 50 is also used to set at least one spacer 120 on at least one first pole piece portion 111 of the second pole piece 113.

[0181] In some embodiments, at least one spacer 120 may be formed on a temporary substrate (not shown in the figure), and the temporary substrate may be a peeling film, so that the second providing mechanism 50 transfers the at least one spacer 120 on the temporary substrate to the at least one first pole piece portion 111 of the target pole piece. The second providing mechanism 50 is a mechanism capable of providing at least one spacer 120 on the at least one first pole piece portion 111 of the target pole piece, and may include a clamp, a suction cup, or a manipulator, etc., as long as at least one spacer 120 can be provided on the at least one first pole piece portion 111 of the target pole piece.

[0182] In some embodiments, a peeling layer is provided at the position where the clamp, suction cup or robot contacts the spacer 120 to reduce the probability of the spacer 120 sticking to the clamp, suction cup or robot.

[0183] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0184] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A method for manufacturing a battery cell, characterized in that: include: Providing a plurality of pole pieces (110); the pole piece (110) comprises at least one first pole piece portion (111), the first pole piece portion (111) having a large surface (1111); the plurality of pole pieces (110) comprises a target pole piece; At least one spacer (120) is provided on at least one of the first pole piece portions (111) of the target pole piece; The spacer (120) has a head end (1201) and a tail end (1202) arranged at intervals along a first direction, and the spacer (120) is longitudinally extended from the head end (1201) to the tail end (1202); The first direction is parallel to the large surface (1111); At least a portion of the spacer (120) is soluble in the electrolyte in the battery cell.

2. The method for manufacturing a battery cell according to claim 1, characterized in that: The spacer (120) is arranged to extend longitudinally along the first direction; and / or The battery cell is a wound battery cell, and the first direction is parallel to the width direction of the pole piece (110).

3. The method for manufacturing a battery cell according to claim 2, characterized in that: The manufacturing method of the battery cell further comprises: providing a shell for mounting the plurality of pole pieces (110), wherein a liquid injection hole is provided on one side of the shell along the first direction; Along the first direction, the spacer (120) is extended from one side of the large surface (1111) away from the injection hole toward the other side of the large surface (1111).

4. The method for manufacturing a battery cell according to claim 2, characterized in that: The size of the large surface (1111) along the first direction is H1, and the size of the spacer (120) along the first direction is H2; Among them, 1 / 2H1≤H2≤4 / 5H1.

5. The method for manufacturing a battery cell according to claim 1, characterized in that: Along the first direction, the center of the large surface (1111) is located between the head end (1201) and the tail end (1202).

6. The method for manufacturing a battery cell according to claim 1, characterized in that: The manufacturing method of the battery cell further comprises: providing a shell for mounting the plurality of pole pieces (110), wherein a liquid injection hole is provided on one side of the shell along the first direction; A side of the spacer (120) away from the liquid injection hole along the first direction is arranged flush with a side of the large surface (1111) away from the liquid injection hole along the first direction.

7. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: At least one spacer (120) is provided on at least one of the first pole piece portions (111) of the target pole piece, specifically comprising: A plurality of the spacers (120) are arranged at intervals along a second direction on at least one of the first pole pieces (111) of the target pole piece; The first direction and the second direction intersect each other and are both parallel to the large surface (1111).

8. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The thickness of the spacer (120) is 10 μm-50 μm.

9. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The material of the spacer (120) includes an electrolyte additive and an adhesive; The electrolyte additive can be dissolved in the electrolyte in the battery cell; The adhesive is used to bond the spacer (120) to the large surface (1111) of the target pole piece.

10. The method for manufacturing a battery cell according to claim 9, characterized in that: The spacer (120) comprises an electrolyte additive layer (121) and an adhesive layer (122) which are stacked; The adhesive layer (122) is provided between the electrolyte additive layer (121) and the large surface (1111) of the target electrode.

11. The method for manufacturing a battery cell according to claim 10, characterized in that: The thickness of the adhesive layer (122) is 1 µm-5 µm.

12. The method for manufacturing a battery cell according to claim 10, characterized in that: The thickness of the adhesive layer (122) is greater than or equal to one fifth of the thickness of the electrolyte additive layer (121), and less than or equal to one half of the thickness of the electrolyte additive layer (121).

13. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The manufacturing method of the battery cell further comprises: providing a shell for mounting the plurality of pole pieces (110), wherein a liquid injection hole is provided on one side of the shell along the first direction; Along the first direction, compared with the tail end (1202), the head end (1201) is arranged farther away from the liquid injection hole; The dimension of the head end (1201) along the second direction is smaller than the dimension of the tail end (1202) along the second direction; The first direction and the second direction intersect each other and are both parallel to the large surface (1111).

14. The method for manufacturing a battery cell according to claim 13, characterized in that: Along a side of the large surface (1111) away from the injection hole and pointing toward another side of the large surface (1111), the size of the spacer (120) along the second direction gradually increases.

15. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The manufacturing method of the battery cell further comprises: providing a shell for mounting the plurality of pole pieces (110), wherein a liquid injection hole is provided on one side of the shell along the first direction; Along the first direction, compared with the tail end (1202), the head end (1201) is arranged farther away from the liquid injection hole; The thickness of the head end (1201) is greater than the thickness of the tail end (1202).

16. The method for manufacturing a battery cell according to claim 15, characterized in that: Along the direction from the head end (1201) to the tail end (1202), the thickness of the spacer (120) gradually decreases.

17. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: defining the first pole piece portion (111) provided with the spacer (120) as a target pole piece portion; Among the plurality of pole pieces (110), the spacers (120) on at least two of the target pole pieces are arranged in a staggered manner along a second direction; The first direction and the second direction intersect each other and are both parallel to the large surface (1111).

18. The method for manufacturing a battery cell according to claim 17, characterized in that: Among the plurality of pole pieces (110), the spacers (120) on any two of the target pole pieces are arranged in a staggered manner along the second direction.

19. The method for manufacturing a battery cell according to claim 17, characterized in that: Among the plurality of pole pieces (110), the orthographic projections of the spacers (120) on at least two of the target pole pieces in the reference plane do not overlap each other; Wherein, the reference plane is parallel to the large surface (1111).

20. The method for manufacturing a battery cell according to claim 19, characterized in that: Among the plurality of pole pieces (110), the orthographic projections of the spacers (120) on any two of the target pole pieces in the reference plane do not overlap with each other.

21. The method for manufacturing a battery cell according to any one of claims 1 to 6, characterized in that: The plurality of pole pieces (110) include a first pole piece (112) and a second pole piece (113), and at least one of the first pole piece (112) and the second pole piece (113) is the target pole piece; The method for manufacturing the battery cell further includes: Providing at least one isolating member (130), the isolating member (130) having at least one isolating portion (131) corresponding to the at least one first pole piece portion (111); The first pole piece portion (111) and the isolation portion (131) are stacked, and the plurality of pole pieces (110) and the at least one isolation member are pressed together to form an electrode assembly (1101); Wherein, the first pole piece (112) and the second pole piece (113) are separated by the corresponding isolation portion (131).

22. A battery cell, characterized in that: The battery cell is manufactured by the manufacturing method of any one of claims 1 to 21.

23. An electrical equipment, characterized in that: A battery device is included, the battery device including the battery cell of claim 22.

24. A battery production line, characterized in that: The battery production line is used to manufacture battery cells, and the battery production line comprises: A first providing mechanism is at least used to provide a plurality of pole pieces; wherein the pole piece comprises at least one first pole piece portion (111), the first pole piece portion (111) having a large surface (1111); the plurality of pole pieces comprises a target pole piece; and a second providing mechanism, the second providing mechanism being used to provide at least one spacer (120) on at least one of the first pole piece portions (111) of the target pole piece; The spacer (120) has a head end (1201) and a tail end (1202) arranged opposite to each other along a first direction, and the spacer (120) is longitudinally extended from the head end (1201) to the tail end (1202); The first direction is parallel to the large surface (1111); At least a portion of the spacer (120) is soluble in the electrolyte in the battery cell.

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