Battery cell assembly and power utilization device

Abstract

The utility model relates to the technical field of energy storage devices, and particularly discloses a battery cell assembly and a power utilization device. The battery cell assembly comprises a first battery cell, a second battery cell and an insulating interlayer, wherein the second battery cell and the first battery cell are overlapped, and the first battery cell comprises a first battery cell body and a first top sealing part arranged at the top end of the first battery cell body; the second battery cell comprises a second battery cell body and a second top sealing part arranged at the top end of the second battery cell body; an insulating interlayer is arranged between the first battery cell and the second battery cell, one end of the insulating interlayer extends along the first direction to protrude out of the edge of the first top sealing part, and the two ends of the insulating interlayer along the second direction respectively at least extend to be flush with the two ends of the first top sealing part along the second direction. According to the battery cell assembly provided by the invention, only the insulating interlayer needs to be arranged between the first battery cell and the second battery cell, and independent insulating treatment does not need to be performed on the first battery cell and the second battery cell, so that materials are saved, the preparation process is simplified, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage device technology, and more specifically, to a battery cell assembly and an electrical device. Background Technology

[0002] A battery is a device that generates electrical energy. Using batteries as an energy source, they offer stable voltage and current, provide stable power for extended periods, are less affected by external factors, and are easy to charge and discharge. Therefore, they are commonly used to power external devices such as mobile phones, tablets, laptops, and other portable or mobile electronic devices.

[0003] Pouch batteries are a common type of battery, known for their lightweight properties. They typically use an aluminum-plastic film as the outer packaging and separator for the battery cells. Because aluminum has excellent electrical conductivity, if the edges of the aluminum-plastic film are not insulated, they may short-circuit upon contact with internal electrodes or other conductive components, potentially damaging the battery or even causing safety hazards. Therefore, for pouch batteries with multiple stacked cells, insulation is necessary between the cells to prevent electrical corrosion caused by contact between the aluminum layers of the top sealing film of one cell and the aluminum layers of the top sealing film of an adjacent cell.

[0004] Currently, the common insulation method is to wrap the top edge of each individual battery cell with a PI (Polyimide) film for insulation. However, this method requires wrapping each battery cell, that is, wrapping the top edge of each battery cell. Moreover, the PI film material used for wrapping has a complex shape, the wrapping process is cumbersome, material-intensive, and inefficient. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a battery cell assembly and an electrical device, the structural design of which can effectively solve the problem of low processing efficiency of the top sealing edge of the battery cell by wrapping it with PI film insulation.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A battery cell assembly includes a first battery cell, a second battery cell, and an insulating separator;

[0008] The first battery cell includes a first battery cell body and a first top seal portion disposed at the top of the first battery cell body;

[0009] The second battery cell is stacked on top of the first battery cell and includes a second battery cell body and a second top seal portion disposed at the top of the second battery cell body;

[0010] An insulating layer is provided between the first battery cell and the second battery cell. One end of the insulating layer extends along a first direction to be flush with the edge of the first top seal, and both ends of the insulating layer extend along a second direction to be flush with the two ends of the first top seal along the second direction, respectively.

[0011] Wherein, the first direction is the direction from the bottom end to the top end of the first cell body, and the second direction is perpendicular to the first direction and perpendicular to the stacking direction of the first cell and the second cell.

[0012] Optionally, in the above-mentioned cell assembly, the insulating layer includes:

[0013] The partition body has a length between its two ends along the second direction that is not less than the length between the two ends of the first top sealing portion along the second direction.

[0014] Two side portions are respectively connected to the two ends of the separator body along the second direction and extend along a third direction, wherein the third direction is the stacking direction of the first cell and the second cell.

[0015] Optionally, in the above-mentioned battery cell assembly, a first thinning portion is provided at the connection between the separator body and the two side portions, and the thickness of the first thinning portion is less than the thickness of the separator body and the thickness of the side portions.

[0016] Optionally, in the above-mentioned battery cell assembly, the insulating separator further includes a protrusion, which is connected to one end of the separator body along the first direction and extends along the first direction. The connection between the protrusion and the separator body is flush with the edge of one end of the first top seal along the first direction.

[0017] Optionally, in the above-mentioned battery cell assembly, the insulating layer further includes a top edge portion, which is connected to one end of the insulating layer body along the first direction, extends along the third direction, and the top edge portion and the protrusion are distributed sequentially along the second direction.

[0018] Optionally, in the above-mentioned battery cell assembly, the top edge portion is provided on both sides of the protrusion along the second direction, and the side edge portion and the projection of the top edge portion in the second direction are adjacent.

[0019] Optionally, in the above-mentioned battery cell assembly, a second thinning portion is provided at the connection between the top edge and the separator body, and the thickness of the second thinning portion is less than the thickness of the separator body and the thickness of the top edge.

[0020] Optionally, in the above-described battery cell assembly, a gap exists between the top edge and the protrusion along the second direction.

[0021] Optionally, in the above-mentioned battery cell assembly, the insulating layer is bonded to the first battery cell or the second battery cell.

[0022] Optionally, in the above-mentioned battery cell assembly, the insulating layer includes an adhesive portion opposite to the second battery cell body, and the adhesive portion is bonded to the second battery cell body.

[0023] Optionally, in the above-mentioned battery cell assembly, the bonding portion is disposed at the end of the separator body and the side portion away from the protrusion, and the width of the middle portion of the insulating separator is greater than the width of the top sealing groove of the second battery cell body along the first direction, wherein the width of the middle portion is the width of the insulating separator along the first direction minus the width of the protrusion along the first direction minus the width of the bonding portion along the first direction.

[0024] The battery cell assembly provided in this application includes a first battery cell, a second battery cell, and an insulating layer. The second battery cell is stacked on top of the first battery cell. The first battery cell includes a first battery cell body and a first top seal portion disposed at the top of the first battery cell body. The second battery cell includes a second battery cell body and a second top seal portion disposed at the top of the second battery cell body. An insulating layer is provided between the first battery cell and the second battery cell. One end of the insulating layer extends along a first direction to at least be flush with the edge of the first top seal portion, and the opposite sides of the insulating layer extend to at least be flush with the sides of the first top seal portion. The first direction is from the bottom end to the top end of the first battery cell body.

[0025] By applying the cell assembly provided in this application, for the stacked first and second cells, an insulating layer is provided between them. The top end of the insulating layer along the first direction is flush with the edge of the first top seal and extends beyond the edge of the first top seal. The two ends of the insulating layer along the second direction are flush with the edge of the first top seal or extend beyond the sides of the first top seal. Therefore, the insulating layer can separate the edge of the first top seal from the edge of the second top seal, thereby playing an insulating role. This effectively prevents accidental contact caused by external factors (such as friction, squeezing, etc.) during the use of the battery using this cell assembly, thereby improving battery safety and reducing the risk of battery fire or explosion.

[0026] Furthermore, only an insulating layer needs to be placed between the first and second battery cells, eliminating the need for separate insulation treatments for each cell. This saves materials, simplifies the manufacturing process, and improves production efficiency. Moreover, since the insulating layer is laid between the first and second battery cells, it is not necessary to wrap the first or second top seal during manufacturing, simplifying the operation. The insulating layer can also be made in a regular shape, further saving manpower and resources.

[0027] To achieve the above objectives, this application also provides an electrical device comprising any of the aforementioned battery cell assemblies. Since the aforementioned battery cell assemblies possess the aforementioned technical effects, the electrical device comprising such battery cell assemblies should also possess the corresponding technical effects. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a battery cell according to a specific embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the structure of a battery cell assembly according to a specific embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the unfolded insulating layer according to a specific embodiment of this application;

[0032] Figure 4 for Figure 3 A diagram of the back of the building;

[0033] Figure 5 This is a schematic diagram of the control circuit board.

[0034] Figure 6 A schematic diagram showing the assembly of the second battery cell and the control circuit board;

[0035] Figure 7 Schematic diagram of insulating layer attachment;

[0036] Figure 8 This is a schematic diagram showing the placement of the first battery cell;

[0037] Figure 9 for Figure 8 Side view;

[0038] Figure 10 for Figure 8 A magnified view of part A in the middle;

[0039] Figure 11 This is a schematic diagram of the first shell structure;

[0040] Figure 12 This is a top view of the first shell.

[0041] Figure 13 This is a schematic diagram of the battery cell assembly and casing.

[0042] Figure 14 This is a magnified view of a portion of the side panel folded over.

[0043] Figure 15 This is a magnified view of a portion of the top edge that has been folded over.

[0044] Figure 16 This is a schematic diagram of the structure of a battery according to a specific embodiment of this application;

[0045] Figure 17 This is a schematic diagram of the battery structure according to another specific embodiment of this application.

[0046] Figure label:

[0047] 1-Battery cell; 101-Battery cell body; 102-Top seal; 103-Taper; 104-Head end; 105-Top seal groove; 106-Top seal edge;

[0048] 11-First battery cell; 111-First battery cell body; 112-First top seal; 113-First electrode tab;

[0049] 12-Second cell; 121-Second cell body; 122-Second top seal; 123-Second tab; 13-Buffer pad;

[0050] 2-Insulating layer; 21-Layer body; 22-Side portion; 23-First thinned portion; 24-Top edge portion; 25-Protrusion; 26-Second thinned portion; 27-Adhesive portion; 28-Notch;

[0051] 3-Housing shell; 31-Mounting groove; 32-Limiting post; 33-First housing shell; 34-Second housing shell;

[0052] 4-Control circuit board; 41-Electrical connection part; 42-Connector terminal;

[0053] 5 - Tag; 51 - First tag; 52 - Second tag. Detailed Implementation

[0054] This application discloses a battery cell assembly and an electrical device to reduce the insulation cost of the top sealing section and improve production efficiency.

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] Please see Figure 1The battery cell 1 provided in this application includes a battery cell body 101 and a tab 103 extending from one end of the battery cell body 101. For ease of explanation, the end of the battery cell 1 extending from the tab 103 is referred to as the head end 104. The tab 103 is electrically connected to the battery cell body 101. The battery cell body 101 is responsible for storing electrical energy, and the tab 103 is used for electrical connection with the battery control circuit board 4. Specifically, the tab 103 can be configured as a positive tab and a negative tab electrically connected to the battery cell body 101. For example, there can be two tabs 103, one of which is a positive tab and the other is a negative tab. Alternatively, there can be more than two tabs 103. For example, the head end 104 of the battery cell body 101 is connected to three tabs 103, one of which is a positive tab and the other two are negative tabs connected in parallel. For example, the width of the positive electrode tab ranges from 5 to 8 mm, and the width of the negative electrode tab ranges from 5 to 8 mm. It should be noted that, unless otherwise stated, the numerical ranges mentioned in this application include the values ​​at both ends. For a pouch battery, the cell 1 also includes a protective structure disposed on the cell body 101, and the protective structure forms a top sealing groove 105 at the top of the cell body 101. For example, the width C of the top sealing groove 105 ranges from 2.5 to 3.5 mm. The protective structure at the top sealing groove 105 is called the top sealing portion 102. In some specific examples, the top sealing portion 102 can be made of a polymer film, such as aluminum-plastic film material. The top edge of the top sealing portion 102, i.e., the top sealing edge 106, needs to be insulated to prevent accidental short circuits caused by external factors (such as friction, compression, etc.) during battery use, and also to prevent the negative electrode and the aluminum layer of the aluminum-plastic film from forming an electronic path that would cause internal corrosion and damage to the cell 1. In this application, the insulation method of the top sealing part 102 has been improved, and the following embodiments will mainly describe it.

[0057] In some embodiments, please refer to Figures 2-4 The battery cell assembly provided in this application includes a first battery cell 11, a second battery cell 12, and an insulating layer 2. The second battery cell 12 is stacked on top of the first battery cell 11. The first battery cell 11 includes a first battery cell body 111 and a first top seal portion 112 disposed at the top of the first battery cell body 111; the second battery cell 12 includes a second battery cell body 121 and a second top seal portion 122 disposed at the top of the second battery cell body 121. It is understood that the stacking order of the first battery cell 11 and the second battery cell 12 is not specifically limited here; that is, the first battery cell 11 can be disposed above or below the second battery cell 12. Of course, "above" and "below" here are only used to distinguish the relative positional relationship of the first battery cell 11 and the second battery cell 12, and to define the positional relationship under use. Figure 2In this example, the first cell 11 is located above the second cell 12. In other examples, the first cell 11 may also be located below the second cell 12. It is understood that the naming of the first cell 11 and the second cell 12 is to distinguish between two different cells, not to specify their primary or secondary importance. Their specific structures can be found in [reference needed]. Figure 1 And as stated above. The front and back orientations of the first battery cell 11 and the second battery cell 12 can be the same or different. For example, Figure 2 The back sides of the first battery cell 11 and the second battery cell 12 are positioned opposite each other, meaning the top sealing grooves of the first battery cell 11 and the second battery cell 12 are positioned opposite each other, so that their tabs can be connected to the control circuit board 4 respectively. For ease of explanation, the direction from the bottom end to the top end of the first battery cell body 111 is referred to as the first direction, and correspondingly, the direction from the bottom end to the top end of the second battery cell body 121 is also referred to as the first direction.

[0058] An insulating layer 2 is provided between the first battery cell 11 and the second battery cell 12. Unlike the conventional method of wrapping an insulating film around the top edge, in this application, an insulating layer 2 is provided between the first top sealing portion 112 and the second top sealing portion 122 to separate the top edge of the first top sealing portion 112 from the top edge of the second top sealing portion 122. One end of the insulating layer 2 extends at least along the first direction to be flush with the edge of the first top sealing portion 112. It can be understood that one end of the insulating layer 2 refers to the end of the insulating layer 2 extending in the first direction. This end extends along the first direction and exceeds the edge of the first top sealing portion 112, but does not fold back around the edge of the first top sealing portion 112 or the second top sealing portion 122. Therefore, during assembly, the insulating layer 2 can be directly laid between the first battery cell 11 and the second battery cell 12. In one example, one end of the insulating layer 2 extends to be flush with the top sealing edge 106 of the first top sealing portion 112; in another example, one end of the insulating layer extends beyond the top sealing edge 106 of the first top sealing portion 112. Both ends of the insulating layer 2 along the second direction extend at least to be flush with both ends of the first top sealing portion 112 along the second direction. In one example, both ends of the insulating layer 2 along the second direction extend to be flush with both ends of the first top sealing portion 112 along the second direction; in another example, both ends of the insulating layer 2 along the second direction extend beyond both ends of the first top sealing portion 112 along the second direction. The second direction is perpendicular to the first direction and perpendicular to the stacking direction of the first battery cell 11 and the second battery cell 12. With this configuration, the peak edges of the first top sealing portion 112 can be opposite to the insulating layer 2, thereby effectively isolating the peak edges of the first top sealing portion 112 from the peak edges of the second top sealing portion 122.

[0059] By applying the battery cell assembly provided in this application, for the stacked first battery cell 11 and second battery cell 12, an insulating layer 2 is provided between them. The top end of the insulating layer 2 along the first direction is flush with or extends beyond the edge of the first top seal portion 112, and both ends of the insulating layer 2 along the second direction are flush with or extend beyond the sides of the first top seal portion 112. Therefore, the insulating layer 2 can separate the edge of the first top seal portion 112 from the edge of the second top seal portion 122, thereby providing insulation. This effectively prevents accidental contact caused by external factors such as friction and compression during use of the battery using this cell assembly, thereby improving battery safety and reducing the risk of battery fire or explosion. This further extends the battery's lifespan and ensures its long-term stable operation.

[0060] Furthermore, for the first battery cell 11 and the second battery cell 12, only an insulating layer 2 needs to be placed between them, eliminating the need for separate insulation treatment of each cell. This saves materials, simplifies the manufacturing process, and improves production efficiency. Moreover, since the insulating layer 2 is laid between the first battery cell 11 and the second battery cell 12, it is not necessary to wrap the first top seal 112 or the second top seal 122 during manufacturing, simplifying the operation. The insulating layer 2 can also be in a regular shape, further saving manpower and resources.

[0061] In some specific examples, the first battery cell 11 and the second battery cell 12 have the same specifications, and the corresponding first top seal 112 and second top seal 122 have the same dimensions. When one end of the insulating layer 2 extends along the first direction to protrude from or be flush with the edge of the first top seal 112, and both ends of the insulating layer 2 extend along the second direction to be flush with both ends of the first top seal 112 along the second direction, then one end of the insulating layer 2 correspondingly extends along the first direction to protrude from or be flush with the edge of the second top seal 122, and both ends of the insulating layer 2 correspondingly extend along the second direction to be flush with both ends of the second top seal 122 along the second direction.

[0062] In other specific examples, the first cell 11 and the second cell 12 have different specifications, such as different lengths along the first direction or different widths along the second direction. To provide more reliable insulation, one end of the insulating layer 2 extends along the first direction to protrude from or be flush with the edge of the first top seal 112, and also protrudes from or be flush with the edge of the second top seal 122. The two ends of the insulating layer 2 along the second direction extend at least to be flush with the two ends of the first top seal 112 along the second direction, and also extend at least to be flush with the two ends of the second top seal 122 along the second direction.

[0063] In some embodiments, please refer to Figures 3-4The insulating layer 2 includes a layer body 21 and two side portions 22. The length between the two ends of the layer body 21 along the second direction is not less than the length between the two ends of the first top seal portion 112 along the second direction. The two side portions 22 are respectively connected to the two ends of the layer body 21 along the second direction and extend along a third direction, wherein the third direction is the stacking direction of the first battery cell 11 and the second battery cell 12. It can be understood that the stacking direction of the first battery cell 11 and the second battery cell 12 includes the direction from the first battery cell 11 to the second battery cell 12, and also includes the direction from the second battery cell 12 to the first battery cell 11. In this embodiment, the opposite sides of the insulating layer 2 extend beyond the sides of the first top seal portion 112. The separator body 21 is located between the first battery cell 11 and the second battery cell 12 in the third direction. Two side portions 22 extend from both ends of the separator body 21 in the second direction, forming two side portions 22. For example, the two side portions 22 extend from both ends of the insulating separator 2 in the second direction toward the first battery cell 11. The side portions 22 ensure that the length of the insulating separator 2 in the second direction is greater than the length of the first top seal portion 112, thereby ensuring that the top seal edge 106 of the first top seal portion 112 is completely isolated from the second top seal portion 122. Specifically, the length E of the separator body 21 in the second direction is equal to the width B of the first battery cell. In other examples, the two side portions 22 extend from both ends of the insulating separator 2 in the second direction toward the second battery cell 12, or one extends toward the first battery cell 11 and the other extends toward the second battery cell 12.

[0064] In some embodiments, a first thinning portion 23 is provided at the connection between the insulating layer body 21 and the two side portions 22, respectively. The thickness of the first thinning portion 23 is less than the thickness of the insulating layer body 21 and the thickness of the side portions 22. By providing the first thinning portion 23, a weak structure is formed between the side portions 22 and the insulating layer body 21, which facilitates bending so that the side portions 22 and the insulating layer body 21 form a certain angle, such as 90 degrees, greatly facilitating the assembly of the insulating layer 2.

[0065] In some specific examples, the first thinning portion 23 is a through hole, such as a strip-shaped through hole. Multiple through holes are spaced apart at the connection between the insulating layer body 21 and the side portion 22 to form a seam. For example, the width of the through hole along the second direction ranges from 1.0 to 3.0 mm, the spacing between adjacent through holes ranges from 1.0 to 3.0 mm, and the distance between the through hole closest to the edge and the edge of the insulating layer 2 is greater than 2.0 mm. The seam reduces bending stress, facilitating the folding of the insulating layer 2.

[0066] In some embodiments, the height of the side portion 22 along a third direction ranges from 0.5 mm to 3 mm. Figure 3In the middle, the height H of the side portion 22 along the third direction satisfies: 0.5mm ≤ H ≤ 3mm. For example, the height H of the side portion 22 along the third direction is 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm. By setting the height of the side portion 22 within the above-mentioned value range, even if the width of the first cell 11 is slightly different, a margin is reserved for assembly and processing, and it can still be ensured that the insulating layer 2 separates the top sealing edge 106 of the first top sealing portion 112.

[0067] In some embodiments, the insulating layer 2 has a notch 28 at one end edge of the first top seal portion 112 along a first direction. When the cell assembly is assembled into the battery, it can be installed inside the battery housing 3. By providing the notch 28 on the insulating layer 2, it can avoid misalignment with the locking part provided on the housing 3 for positioning or locking. That is, in the assembled state, the locking part is provided at the notch 28. In addition, by providing the notch 28 at the edge of the insulating layer 2 protruding from the first top seal portion 112, the misalignment requirement is met without affecting the effective isolation of the top seal edge 106 of the first top seal portion 112.

[0068] In some embodiments, the insulating layer 2 includes a layer body 21 and a protrusion 25. The length between the two ends of the layer body 21 along the second direction is not less than the length between the two ends of the first top sealing portion 112 along the second direction. The protrusion 25 is connected to one end of the layer body 21 along the first direction and extends along the first direction, with the connection point between the protrusion 25 and the layer body 21 flush with the edge of one end of the first top sealing portion 112 along the first direction. The layer body 21 is the portion of the insulating layer 2 located inside the top sealing edge of the first top sealing portion 112, and the protrusion 25 is located outside the top sealing edge of the first top sealing portion 112 in the first direction, that is, it extends beyond the first top sealing portion 112 in the first direction. By providing the protrusion 25, the end of the insulating layer 2 along the first direction, i.e., the top end, extends beyond the edge of the first top sealing portion 112, thus better ensuring that the insulating layer 2 separates the edge of the first top sealing portion 112 from the edge of the second top sealing portion 112, thereby achieving an insulating function.

[0069] In some embodiments, the insulating spacer 2 further includes a top edge portion 24, which is connected to one end of the spacer body 21 along a first direction and extends along a third direction. The top edge portion 24 and the spacer body 21 are sequentially distributed along a second direction, and a notch 28 is formed between the top edge portion 24 and the spacer body 21. It is understood that both the top edge portion 24 and the protrusion 25 are located at the top end of the spacer body 21 along the first direction, and the top edge portion 24 and the protrusion 25 are adjacent to or spaced apart. For example, the top edge portion 24 is located outside the protrusion 25 along the second direction, specifically as shown below. Figure 2The top left and right sides of the top of the partition layer body 21 are respectively provided with top edge portions 24. The top edge portions 24 extend in a third direction, which can form the above-mentioned notch 28 to avoid misalignment during assembly, and at the same time can isolate the top sealing edges of the corresponding positions of the first top sealing portion 112 and the second top sealing portion 122 for insulation.

[0070] In the case where the insulating layer 2 includes a top edge 24 and a side edge 22, in some embodiments, the top edge 24 is provided on both sides of the protrusion 25 along the second direction. For example, the side edge 22 and the top edge 24 are adjacent in projection in the second direction. This arrangement can better separate the first top seal 112 and the second top seal 122, and facilitate the formation of the side edge 22 and the top edge 24 by folding. Specifically, the battery housing 3 can be used in conjunction with the cell assembly. For example, the housing 3 is provided with a mounting groove 31. By matching the size of the mounting groove 31 with the cell assembly, and by matching the snap-fit ​​part on the housing 3 with the cell assembly, during the assembly process, the wall surface of the mounting groove 31 and the side edge 22 abut against each other to apply a force to the side edge 22, and the snap-fit ​​part abuts against the top edge 24 to apply a force to the top edge 24, so that the side edge 22 and the top edge 24 are folded under force to form the desired shape.

[0071] In some embodiments, a second thinning portion 26 is provided at the connection between the top edge 24 and the interlayer body 21. The thickness of the second thinning portion 26 is less than the thickness of the interlayer body 21 and the thickness of the top edge 24. By providing the second thinning portion 26, a weak structure is formed between the top edge 24 and the interlayer body 21, which facilitates bending the top edge 24 and the interlayer body 21 to form a certain angle, such as 90 degrees, greatly facilitating the assembly of the insulating interlayer 2. The specific configuration of the second thinning portion 26 can be referred to the structure of the first thinning portion 23 described above, and will not be repeated here.

[0072] In some embodiments, the top edge 24 is abutted against the top sealing edge of the first top sealing portion 112 or the top sealing edge of the second top sealing portion 122. In one example, the top edge 24 extends toward the first cell 11 and is abutted against the top sealing edge of the first top sealing portion 112; in another example, the top edge 24 extends toward the second cell 12 and is abutted against the top sealing edge of the second top sealing portion 122. As configured above, the insulating layer 2 can further shield the top sealing edges of the first top sealing portion 112 or the second top sealing portion 122, making the insulation more reliable.

[0073] In some embodiments, a gap exists between the top edge 24 and the protrusion 25 along the second direction. That is, the connection between the top edge 24 and the interlayer body 21, and the connection between the protrusion 25 and the interlayer body 21, are spaced apart. For an insulating interlayer 2 that is initially planar, after folding, a gap exists between the portion forming the top edge 24 and the protrusion 25 in the second direction to facilitate folding. Specifically, the length of the gap along the first direction is the same as the length of the protrusion 25 along the first direction, and the width G of the gap along the second direction ranges from 0.5 mm to 1.0 mm. For example, the width G of the gap along the second direction is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm. The gap may specifically be rounded to prevent stress tearing.

[0074] In some embodiments, the length J of the protrusion 25 along the first direction is not greater than 2.5 mm. Figure 3 In this case, the length J of the protrusion 25 ranges from 0 mm to 2.5 mm. For example, the length J of the protrusion 25 along the first direction is 0.5 mm, 1 mm, 1.5 mm, 2 mm, or 2.5 mm. By setting the length of the protrusion 25 within the above-mentioned range, it is possible to ensure that the insulating layer 2 separates the top sealing edge 106 of the first top sealing portion 112.

[0075] In some embodiments, the insulating layer 2 is bonded to the first battery cell 11 or the second battery cell 12. Using bonding to fix the insulating layer 2 ensures reliable connection, facilitates assembly, and further improves production efficiency.

[0076] In some embodiments, the insulating layer 2 includes an adhesive portion 27 opposite to the second cell body 121, and the adhesive portion 27 is bonded to the second cell body 121. The purpose of the adhesive portion 27 is to fix the insulating layer 2 to the first cell 11 or the second cell 12. Its length L along the first direction ranges from 3.0 to 6.0 mm. The larger the value of the length L, the more area is bonded to the cell, and the stronger the bond. For example, the length L of the adhesive portion 27 along the first direction is 3.0 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, or 6.0 mm.

[0077] In some embodiments, the adhesive portion 27 is disposed at the end of the insulating layer body 21 and the side portion 22 away from the protrusion 25. The width of the middle portion of the insulating layer 2 is greater than the width of the top sealing groove of the second cell body 121 along the first direction. The middle portion width is the width of the insulating layer 2 along the first direction minus the width of the protrusion 25 along the first direction and the width of the adhesive portion 27 along the first direction. The difference between the width I of the insulating layer 2 along the first direction and the width J of the protrusion 25 along the first direction, and the width L of the adhesive portion 27 along the first direction, needs to be greater than the width of the top sealing groove so that the adhesive portion 27 can adhere to the cell surface. The thickness K of the insulating layer 2 ranges from 0.05 to 0.2 mm. For example, the thickness K of the insulating layer 2 is 0.05 mm, 0.1 mm, 0.15 mm, or 0.2 mm.

[0078] In some embodiments, the insulating layer 2 is a one-piece structure. The one-piece structure has a regular shape, is easy to form, and has low manufacturing costs. For example, the insulating layer 2 is initially planar, and the side portions 22 and top portions 24 are formed by folding.

[0079] In some embodiments, the insulating layer 2 is one of Norme paper, DuPont paper, polyimide film, and high-temperature tape.

[0080] In some embodiments, the battery includes a control circuit board 4, and a first cell 11 and a second cell 12 are electrically connected to the control circuit board 4, respectively. See also... Figure 5 The length S of the control circuit board 4 is slightly less than the width B of the first battery cell 11. For example, the gap between the control circuit board 4 and the first battery cell 11 is 0.3 mm. The width R of the control circuit board 4 is set according to the requirements of the circuit system; for example, the width R of the control circuit board 4 is 10.0~30.0 mm. The thickness T of the control circuit board 4 is 0.8~1.2 mm. The control circuit board 4 is provided with an electrical connection part 41, which serves as a connection medium with the electrode tab. This connection medium is a metal conductor, commonly made of metals such as nickel, copper, or aluminum. An external connector, such as a connector terminal 42, can also be provided on the control circuit board 4. The connector terminal 42 can be soldered to the control circuit board 4, enabling the battery to charge and discharge devices such as laptops.

[0081] In some embodiments, the top end of the insulating layer 2 is attached to the control circuit board 4. The insulating layer 2 can completely separate the first tab 113 of the first cell 11 and the second tab 123 of the second cell 12, thereby separating the first top seal from the second top seal and the first tab 113 and the second tab 123 or other conductive components, thus effectively preventing accidental contact of the battery due to external factors during use.

[0082] In some embodiments, the battery further includes a housing 3, in which the control circuit board 4 and the battery cell assembly are disposed. The housing 3 provides protection for the control circuit board 4 and the battery cell assembly and assembles them into a whole. Exemplarily, the housing 3 is a plastic housing 3, specifically made of plastic materials such as polycarbonate (PC), polypropylene (PP), and acrylonitrile-butadiene-styrene (ABS), and can be injection molded.

[0083] In some embodiments, please refer to Figures 11-12 The housing 3 has a mounting groove 31, and the battery cell assembly is disposed within the mounting groove 31. The width M of the mounting groove 31 is equal to or slightly greater than the length A of the first battery cell 11, and the width N of the mounting groove 31 is equal to or slightly greater than the width B of the first battery cell 11, so that the first battery cell 11 can be inserted. Where MA < J, NB < H, so that the insulating material can be folded under the action of the housing 3.

[0084] In some embodiments, the housing 3 includes a first housing 33 and a second housing 34, the first housing 33 being connected to the second housing 34, with the first housing 33 located on the back of the battery cell and battery cell assembly, and the second housing 34 located on the front of the battery cell assembly. The housing 3 adopts a split structure for easy assembly. The first housing 33 is located on the back of the battery cell and battery cell assembly as a whole, providing overall protection. It is understood that the first housing 33 can have a frame structure, located on the back of the battery cell assembly, the bottom edge of the battery cell, and the outer side, to allow for better heat dissipation of the battery cell. The second housing 34 is located on the front of the battery cell assembly, primarily providing protection for the battery cell assembly, and cooperating with the first housing 33 to form a frame supporting the battery cell and battery cell assembly as a whole. Specifically, the first housing 33 and the second housing 34 are snap-fitted together, ensuring reliable connection and easy assembly and disassembly. The thickness Q of the first housing 33 is greater than or equal to the total thickness D of the first battery cell 11 and the second battery cell 12.

[0085] In some embodiments, a limiting post 32 is provided inside the housing 3, which can restrict the movement of the first battery cell 11 and the second battery cell 12. Additionally, when the housing 3 includes a first housing 33 and a second housing 34, the limiting post 32 can be provided with a slot to engage with a snap-fit ​​on the second housing 34 to achieve a snap-fit ​​connection between the first housing 33 and the second housing 34. The width P of the limiting post 32 ranges from 0.8 to 2.5 mm, and the length ranges from 3.0 to 10.0 mm. Specifically, the value of the width F minus the height H of the side portion 22 along a third direction is greater than the width of the limiting post 32.

[0086] In some embodiments, battery cell assemblies are respectively disposed on both sides of the housing 3 on the control circuit board 4, and mounting grooves 31 and limiting posts 32 are respectively disposed on the housing 3 and each battery cell assembly. The distance O between adjacent limiting posts 32 is slightly larger than the width R of the control circuit board 4, and the gap between them can be 0.3 mm.

[0087] For a better explanation of this solution, please refer to [link / reference]. Figures 6-15 The following describes the assembly process of this battery using a specific embodiment. Figure 2 The example shown is where the first battery cell 11 is assembled above the second battery cell 12.

[0088] First, place the second battery cell 12 parallel to the horizontal plane of the control circuit board 4. After the first electrode tabs 113 of the first battery cell 11 are stacked with the electrical connection parts 41 on the control circuit board 4, the circuit connection can be firmly secured by laser welding, resistance welding, or soldering, thus completing the welding of the first layer of battery cells. Figure 6 As shown.

[0089] Then, an insulating layer 2 in its unfolded state is applied to the surface of the second cell 12, covering the top edge of the second top seal 122. Additionally, a buffer pad 13, such as cushioning foam, can be applied to the surface of the second cell body 121. By placing the buffer pad 13 between the first cell 11 and the second cell 12, the thickness of the cell's cyclic expansion can be absorbed, connecting and fixing the upper and lower layers of the first cell 11 and the second cell 12. This effectively absorbs impact and vibration, thereby protecting the safety of the battery's internal components during transportation and storage. Figure 7 As shown.

[0090] Next, the first battery cell 11 is placed. Similarly, the first tabs 113 led out from the first battery cell 11 are stacked with the corresponding electrical connection parts 41 on the control circuit board 4. The circuit connection can be firmly secured by laser welding, resistance welding, or soldering, thus realizing the energy storage of the battery. Figure 8 and Figure 9 As shown.

[0091] Please see Figure 9 After the first battery cell 11 and the second battery cell 12 are stacked, the insulating layer 2 in the unfolded state has a width V exposed on the side in the width direction of the battery cell, and V=H. The insulating layer 2 has a length W exposed on the top side in the length direction of the battery cell, and W=J.

[0092] Assemble the control circuit board 4, battery cell assembly, first housing 33, and second housing 34 horizontally downwards. First, insert the battery cell assembly horizontally downwards into the first housing 33, and then mate the hooks on the second housing 34 with the slots on the first housing 33 to complete the assembly.

[0093] like Figures 11-13As shown, when the battery cell assembly is horizontally inserted into the first housing 33, the insulating layer 2 is blocked by the side wall of the housing 3 and the limiting post 32, and simultaneously completes a folding action due to the force. Specifically, the portion of the insulating layer 2 with a width V protruding from the side in the width direction of the battery cell is folded upward along the first thinning portion 23 under the action of force due to the relative displacement between the side wall of the first housing 33 and the width side of the second battery cell 12, forming the side portion 22, as shown. Figure 14 As shown. Similarly, as the battery cell assembly is installed horizontally downwards into the first inner shell, the insulating layer 2 protrudes by a length W at its top edge along the length of the battery cell. Due to the relative displacement between the limiting post 32 and the top sealing edge along the length of the battery cell, this portion folds upwards along the second thinning portion 26 under the action of force, forming the top edge portion 24, as shown. Figure 15 As shown, the folded insulating layer 2 not only insulatingly separates the top edges of the first top seal 112 and the second top seal 122, but also effectively isolates the first tab 113 and the second tab 123, effectively preventing accidental contact of the cell tabs due to external factors during battery use. This battery assembly process is simple, utilizing the stress generated during assembly to fold and wrap the battery, thus improving production efficiency.

[0094] In some embodiments, please refer to Figures 16-17 The battery also includes a label 5 disposed on the outside of the housing 3. For example, an adhesive, screen-printed insulating protective label 5 is used for covering. When the housing 3 includes a first housing 33 and a second housing 34, the label 5 includes a first label 51 disposed on the outside of the first housing 33 and a second label 52 disposed on the outside of the second housing 34 and the front of the battery cell. For example, the first label 51 is a polyethylene terephthalate film with one side blank and the other side coated with adhesive, achieving both insulation and structural bonding after covering. The second label 52 is a polyethylene terephthalate film with one side printed with safety regulations and the other side coated with adhesive, achieving both insulation and structural bonding after covering.

[0095] Based on the battery cell assembly provided in the above embodiments, this application also provides an electrical device, which includes any one of the batteries and battery cell assemblies in the above embodiments. Since this electrical device uses the battery cell assembly in the above embodiments, the beneficial effects of this electrical device can be found in the above embodiments.

[0096] The various embodiments in this specification 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.

[0097] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electrochemical cell assembly, comprising: The battery cell comprises a first electrode (11), a second electrode (12) and an insulating separator (2); The first electrode (11) comprises a first electrode body (111) and a first top sealing part (112) arranged at the top end of the first electrode body (111); The second electrode (12) is stacked with the first electrode (11) and comprises a second electrode body (121) and a second top sealing part (122) arranged at the top end of the second electrode body (121); The insulating separator (2) is arranged between the first electrode (11) and the second electrode (12), one end of the insulating separator (2) extends at least to the edge of the first top sealing part (112) along a first direction, and both ends of the insulating separator (2) along a second direction extend at least to the edges of the first top sealing part (112) along the second direction respectively; The first direction is from the bottom end to the top end of the first electrode body (111), and the second direction is perpendicular to the first direction and the stacking direction of the first electrode (11) and the second electrode (12).

2. The cell assembly of claim 1, wherein, The insulating separator (2) comprises: A separator body (21), the length between both ends of the separator body (21) along the second direction is not less than the length between both ends of the first top sealing part (112) along the second direction; Two side edge parts (22) are respectively connected to both ends of the separator body (21) along the second direction and extend along a third direction, wherein the third direction is the stacking direction of the first electrode (11) and the second electrode (12).

3. The cell assembly of claim 2, wherein, The connection between the separator body (21) and the two side edge parts (22) is respectively provided with a first thinning part (23), and the thickness of the first thinning part (23) is less than the thickness of the separator body (21) and the thickness of the side edge part (22).

4. The cell assembly of any of claims 2-3, wherein, The insulating separator (2) further comprises a protruding part (25) connected to one end of the separator body (21) along the first direction and extending along the first direction, and the connection between the protruding part (25) and the separator body (21) is flush with one end edge of the first top sealing part (112) along the first direction.

5. The cell assembly of claim 4, wherein, The insulating separator (2) further comprises a top edge part (24) connected to one end of the separator body (21) along the first direction, the top edge part (24) extends along the third direction, and the top edge part (24) and the protruding part (25) are sequentially distributed along the second direction.

6. The cell assembly of claim 5, wherein, Along the second direction, both sides of the protruding part (25) are respectively provided with the top edge part (24), and the projections of the side edge part (22) and the top edge part (24) in the second direction are adjacent.

7. The cell assembly of claim 5, wherein, The connection between the top edge part (24) and the separator body (21) is provided with a second thinning part (26), and the thickness of the second thinning part (26) is less than the thickness of the separator body (21) and the thickness of the top edge part (24).

8. The cell assembly of claim 5, wherein, Along the second direction, there is a gap between the top edge part (24) and the protruding part (25).

9. The cell assembly of claim 4, wherein, The insulating partition (2) is bonded to the first electrode body (11) or the second electrode body (12).

10. The cell assembly of claim 9, wherein, The insulating partition (2) includes a bonding portion (27) opposite to the second electrode body (121), and the bonding portion (27) is bonded to the second electrode body (121).

11. The cell assembly of claim 10, wherein, The bonding portion (27) is arranged at an end of the partition main body (21) and the side edge portion (22) away from the protruding portion (25), and a middle portion width of the insulating partition (2) is greater than a width of a top sealing groove of the second electrode body (121) along the first direction, wherein the middle portion width is a width of the insulating partition (2) along the first direction minus a width of the protruding portion (25) along the first direction and minus a width of the bonding portion (27) along the first direction.

12. An electrical device, comprising: An electrode assembly including the electrode assembly according to any one of claims 1 to 11.

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