Battery

Abstract

The invention provides a battery which comprises a shell, a battery cell, a protection assembly and an insulating part, the shell is provided with a top sealing edge, and the top sealing edge is located on one side, in the first direction, of the shell; the battery cell is arranged in the shell, the protection assembly is connected with the battery cell, the protection assembly is arranged on the top sealing edge, the protection assembly comprises a first contact piece, the first contact piece comprises a first area and a second area, in the second direction, the projection of the first area is located outside the projection of the top sealing edge, and the projection of the second area is located inside the projection of the top sealing edge; the insulating part is located between the top sealing edge and the first contact piece so as to connect the top sealing edge and the first contact piece. The surface of the side, facing the top sealing edge, of the insulating part comprises a first insulating area and a second insulating area, the second insulating area is arranged on the side, away from the top sealing edge, of the first insulating area in the first direction, at least part of the second insulating area covers the first area, and the initial adhesion force of the first insulating area is larger than that of the second insulating area. The battery provided by the invention is relatively high in energy density, safety and preparation yield.

Description

Technical Field

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

[0002] Batteries typically have protection components that provide circuit protection when the battery malfunctions or overheats. These protection components are usually mounted on the top edge of the battery. Specifically, a part of the protection component is electrically connected to the battery's tabs. Exposed temperature-sensing elements on the protection component are attached to the top edge to sense the battery's temperature.

[0003] In existing technologies, to avoid the risk of short circuits or battery corrosion caused by the temperature sensing element contacting the battery, the temperature sensing element is covered by the top seal edge. This results in a larger cell seal edge width, which means a corresponding reduction in the width of the cell electrode sheets, leading to a decrease in battery capacity and energy density. While narrowing the top seal edge can effectively improve battery energy density, it also exposes the temperature sensing element beyond the edge of the top seal edge, potentially causing short circuits and cell corrosion. To mitigate these risks, insulating tape is needed between the temperature sensing element and the top seal edge. However, existing insulating tape has high adhesion, which can cause foreign objects, trays, and other components to adhere to the insulating tape during the assembly of the protection components. This results in low assembly efficiency of the protection components and reduces the battery manufacturing yield. Summary of the Invention

[0004] Based on this, this application provides a battery to address the shortcomings of related technologies.

[0005] The battery provided in this application embodiment includes:

[0006] The housing has a top sealing edge located on one side of the housing along a first direction;

[0007] The battery cell is located inside the casing;

[0008] The protection component is electrically connected to the battery cell and is located on the top sealing edge. The protection component includes a first contact piece, which includes a first region and a second region. Along the second direction, the projection of the first region is outside the projection of the top sealing edge, and the projection of the second region is inside the projection of the top sealing edge.

[0009] An insulating element is located between the top seal edge and the first contact piece to connect the top seal edge and the first contact piece;

[0010] The surface of the insulating component facing the top sealing edge includes a first insulating area and a second insulating area. Along the first direction, the second insulating area is located on the side of the first insulating area away from the top sealing edge. The second insulating area at least partially covers the first area. The initial adhesion of the first insulating area is greater than that of the second insulating area.

[0011] The second direction is along the thickness direction of the battery, and the first direction is perpendicular to the second direction.

[0012] In one possible implementation, the insulating element includes a substrate layer, a first adhesive layer, and an adhesive barrier layer stacked along the second direction;

[0013] Along the second direction, a barrier layer is provided on the first adhesive layer, and the surface of the barrier layer facing away from the substrate layer constitutes a second insulating region. Along the first direction, the width W1 of the barrier layer is smaller than the width W2 of the first adhesive layer.

[0014] In one possible implementation, along the first direction, the width W1 of the barrier layer and the width W2 of the first adhesive layer satisfy: W1 / W2≤0.5;

[0015] And / or, the insulating element has a first thickness and a second thickness, the first thickness corresponding to the location of the first insulating area, the second thickness corresponding to the location of the second insulating area, and the second thickness being greater than the first thickness;

[0016] And / or, the dimension W1 of the adhesive barrier layer along the first direction satisfies: 0.2 mm ≤ W1 ≤ 2 mm;

[0017] And / or, the dimension H1 of the adhesive barrier layer along the second direction satisfies: 0.01 mm ≤ H1 ≤ 0.3 mm.

[0018] In one possible implementation, the adhesive barrier layer includes a third region and a fourth region. Along the second direction, the projection of the third region overlaps with the projection of the top sealing edge, and the projection of the fourth region is located outside the projection of the top sealing edge. Along the first direction, the size W3 of the third region satisfies: W3≤0.5mm.

[0019] Alternatively, along the second direction, the projection of the adhesive barrier layer is offset from the projection of the top sealing edge, and along the first direction, the distance W4 between the adhesive barrier layer and the top sealing edge satisfies: W4≤0.5mm.

[0020] In one possible implementation, the first contact piece includes a first connecting portion and a second connecting portion, which are offset from each other in a second direction. Along the second direction, the projection of the first connecting portion and the projection of the adhesive barrier layer at least partially overlap, and the projection area S1 of the overlapping portion and the projection area S2 of the first connecting portion satisfy: S1 / S2≤0.5.

[0021] The protective component also includes a thermal element, which is connected to the first connecting part. Along the second direction, the thermal element is located on the side of the first connecting part away from the top sealing edge. The projection of the thermal element and the projection of the adhesive barrier layer at least partially overlap, and the projection area S3 of the overlapping part and the projection area S4 of the thermal element satisfy: S3 / S4≤0.45.

[0022] In one possible implementation, the average transmittance T of the barrier layer in the visible light band is ≥70%.

[0023] And / or, the barrier layer has a first transmittance T1 at a first wavelength λ1, and the barrier layer has a second transmittance T2 at a second wavelength λ2, the first wavelength λ 1、 The second wavelength λ2 satisfies: |λ1-λ2|≥80nm, and the first transmittance T1 and the second transmittance T2 satisfy: T1 / T2≥1.5.

[0024] In one possible implementation, the insulating element further includes a second adhesive layer, with the first adhesive layer and the second adhesive layer disposed on both sides of the substrate layer, and the second adhesive layer located on the side of the substrate layer facing the first contact piece.

[0025] Along the first direction, the first adhesive layer is flush with the second adhesive layer;

[0026] And / or, along a third direction, the second adhesive layer is flush with the substrate layer;

[0027] And / or, along the first direction, the misalignment distance between the edge of the barrier layer and the edge of the first adhesive layer is less than or equal to 0.2 mm;

[0028] And / or, along a third direction, the misalignment distance between the edge of the barrier layer and the edge of the first adhesive layer is less than or equal to 0.2 mm;

[0029] Among them, the first direction, the second direction, and the third direction are all perpendicular to each other.

[0030] In one possible implementation, the adhesive barrier layer includes one of an imide film, a polyethylene terephthalate film, a polyvinyl chloride film, a nonwoven fabric, and foam.

[0031] And / or, the adhesive barrier layer has a first side, a transition side and a second side that are adjacent to each other in sequence, the first side extends along a first direction and the second side extends along a third direction, and the adhesive barrier layer is arranged in an arc in the area of ​​the transition side.

[0032] Among them, the first direction, the second direction, and the third direction are all perpendicular to each other.

[0033] In one possible implementation, the battery further includes a first tab, which is connected to the cell and extends out of the top seal edge in a first direction;

[0034] The protection assembly includes a second contact piece, a first adapter piece, and a second adapter piece. The second contact piece includes a first end and a second end. The first end of the second contact piece is detachably connected to or disconnected from the first contact piece. The second end of the second contact piece is electrically connected to a first adapter metal piece. The first adapter piece is electrically connected to a second connecting portion. A first tab is electrically connected to one of the first adapter piece and the second adapter piece.

[0035] Along the second direction, the projection of the adhesive barrier layer and the projection of the top sealing edge at least partially overlap, and the upper edge of the adhesive barrier layer near the first electrode extends beyond the upper edge of the first connecting portion near the first electrode.

[0036] In one possible implementation, the battery further includes a first welding portion that connects the first electrode tab to one of the first adapter piece and the second adapter piece, wherein the projection of the first welding portion is located within the projection of the adhesive barrier layer along the second direction.

[0037] The first electrode tab is provided with a first electrode tab adhesive, which is connected to the top sealing edge, and at least a portion of the first electrode tab adhesive extends beyond the top sealing edge along the first direction. The first electrode tab adhesive and the projection of the adhesive barrier layer in the second direction at least partially overlap.

[0038] In this embodiment of the battery, the narrow top seal edge increases the battery's energy density. The first contact piece includes a first region extending beyond the top seal edge and a second region overlapping it. Since the insulating member covers the first region, it provides insulation protection, preventing the first region from being exposed and thus preventing short circuits or corrosion caused by contact between the first contact piece and the battery. The insulating member has a first insulating region on its surface facing the top seal edge. This first insulating region has high adhesion, allowing the second region to be bonded to the top seal edge. This enables the protection component to be installed on the top seal edge, allowing the first contact piece to promptly and accurately sense the battery's temperature. This, in turn, allows the protection component to accurately control the on / off state of the cell and external circuitry. Furthermore, the insulating member also has a second insulating region on its surface facing the top seal edge. This second insulating region is at least partially exposed outside the top seal edge and has low or no adhesion, effectively preventing other substances from adhering to the insulating member. This avoids reducing battery production efficiency and yield, thereby improving the battery's energy density, safety, and manufacturing yield.

[0039] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that the battery provided by this application can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific embodiments. Attached Figure Description

[0040] 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0042] Figure 2 for Figure 1 A schematic diagram of the structure without the insulating components;

[0043] Figure 3 This is a schematic diagram of the structure of the protection component in the battery provided in an embodiment of this application;

[0044] Figure 4 This is a schematic diagram of the structure of the protection components and insulating parts in the battery provided in the embodiments of this application;

[0045] Figure 5 for Figure 4 A schematic diagram of the structure without the insulating components;

[0046] Figure 6 for Figure 4 Rear view;

[0047] Figure 7 A schematic diagram of the structure of the insulating component in the battery provided in this application embodiment. Figure 1 ;

[0048] Figure 8 A schematic diagram of the structure of the insulating component in the battery provided in this application embodiment. Figure 2 ;

[0049] Figure 9 A schematic diagram of the structure of the insulating component in the battery provided in this application embodiment. Figure 3 ;

[0050] Figure 10 for Figure 8 A schematic diagram of the structure when the insulating component is used in a battery;

[0051] Figure 11 for Figure 8 Another structural diagram of an insulating component used in a battery;

[0052] Figure 12 for Figure 9 A schematic diagram of the structure when the insulating component is used in a battery;

[0053] Figure 13A schematic diagram of the structure of the insulating component in the battery provided in this application embodiment. Figure 4 ;

[0054] Figure 14 for Figure 13 A schematic diagram of the structure when the insulating component is used in a battery;

[0055] Figure 15 for Figure 13 Another structural diagram of an insulating component used in a battery;

[0056] Figure 16 for Figure 13 Another structural diagram of an insulating component used in a battery.

[0057] Explanation of reference numerals in the attached figures:

[0058] 100 - Housing; 110 - Top sealing edge; 200 - Protective component; 210 - First contact piece; 211 - First area; 212 - Second area; 210a - First connecting part; 210b - Second connecting part; 220 - Thermosensitive element; 230 - Second contact piece; 230a - Third connecting part; 230b - Fourth connecting part; 231 - Contact point; 240 - First adapter piece; 250 - Second adapter piece; 260 - First protective element; 270 - Second protective element; 280 - Housing; 290 - Spring; 300 - Insulating element; 310 - First insulating area; 320 - Second insulating area; 300a - Substrate layer; 300b - First adhesive layer; 300c - Adhesive barrier layer; 300d - Second adhesive layer; 400 - First tab; 500 - Second tab. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0062] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0063] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0064] In existing technologies, to avoid the risk of short circuits or battery corrosion caused by the temperature sensing element contacting the battery, the temperature sensing element is covered by the top seal edge. This results in a larger cell seal edge width, which means a corresponding reduction in the width of the cell electrode sheets, leading to a decrease in battery capacity and energy density. While narrowing the top seal edge can effectively improve battery energy density, it also exposes the temperature sensing element beyond the edge of the top seal edge, potentially causing short circuits and cell corrosion. To mitigate these risks, insulating tape is needed between the temperature sensing element and the top seal edge. However, existing insulating tape has high adhesion, which can cause foreign objects, trays, and other components to adhere to the insulating tape during the assembly of the protection components. This results in low assembly efficiency of the protection components and reduces the battery manufacturing yield.

[0065] In view of the above problems, this application provides a battery that provides a second insulating area with no stickiness or low stickiness on the surface of the insulating member away from the first contact piece, so as to accurately cover the exposed first contact piece and prevent foreign matter from adhering to the insulating member.

[0066] The specific implementation of the battery provided in this application will be described in detail below with reference to the accompanying drawings.

[0067] Reference Figures 1 to 7 As shown, the battery provided in this application embodiment includes a housing 100, a battery cell, a protection component 200, and an insulating component 300. The battery cell is disposed inside the housing 100, and the housing 100 has a top sealing edge 110, which is located on one side of the housing 100 along a first direction.

[0068] The protection component 200 is located on the top sealing edge 110 and is electrically connected to the battery cell. The protection component 200 can disconnect the battery from the external circuit when the battery is abnormal, thereby protecting the battery. Alternatively, the protection component 200 can make the battery and the external circuit conduct when the battery is working normally.

[0069] The protection component 200 includes a first contact piece 210, which includes a first region 211 and a second region 212. Along the second direction, the orthographic projection of the first region 211 is located outside the orthographic projection of the top sealing edge 110, and the projection of the second region 212 is located inside the orthographic projection of the top sealing edge 110.

[0070] An insulating member 300 is located between the top sealing edge 110 and the first contact piece 210 to connect the top sealing edge 110 and the first contact piece 210. The surface of the insulating member 300 facing the top sealing edge 110 includes a first insulating region 310 and a second insulating region 320. Along a first direction, the second insulating region 320 is located on the side of the first insulating region 310 away from the top sealing edge 110. At least a portion of the second insulating region 320 covers the first region 211. The initial adhesion of the first insulating region 310 is greater than the initial adhesion of the second insulating region 320.

[0071] The second direction is along the thickness direction of the battery, and the second direction can be referred to as the Y direction in the attached figure. The first direction is perpendicular to the second direction, and the first direction can be referred to as the X direction in the attached figure.

[0072] It should be noted that, referring to Figure 3 As shown, the protection component 200 in this embodiment may further include a thermal element 220, a second contact piece 230, a first adapter piece 240, a second adapter piece 250, a spring piece 290, and a housing 280. The first contact piece 210, the thermal element 220, the second contact piece 230, the first adapter piece 240, the second adapter piece 250, and the spring piece 290 are all disposed on the housing 280 and integrated together through the housing 280.

[0073] The first contact piece 210 is connected to the battery cell via the first adapter piece 240, and the second contact piece 230 is connected to the external circuit via the second adapter piece 250. The first contact piece 210 and the second contact piece 230 can selectively make contact or disconnect, thereby making the battery cell and the external circuit conduct or disconnect.

[0074] In this circuit, both the first contact piece 210 and the thermistor 220 are temperature-sensing elements. When the first contact piece 210 is connected to the battery cell via the first adapter piece 240, it can detect the battery's operating temperature. The first contact piece 210 transfers the battery's temperature to the thermistor 220, which then transfers the heat to the spring piece 290. The spring piece 290 undergoes elastic deformation when heated. When the battery temperature is high, the spring piece 290 deforms due to heat, causing the second contact piece 230 to separate from the first contact piece 210, thereby disconnecting the battery cell from the external circuit. When the battery temperature is normal, the spring piece 290 remains in its original state, causing the second contact piece 230 to contact the first contact piece 210, thus connecting the battery cell to the external circuit.

[0075] Specifically, refer to Figure 3 As shown, the first contact piece 210 may include a first connecting portion 210a and a second connecting portion 210b connected to each other. The first connecting portion 210a and the second connecting portion 210b are offset in a second direction. The first connecting portion 210a is positioned closer to the top sealing edge 110 than the second connecting portion 210b, so that the first connecting portion 210a can be connected to the top sealing edge 110. The first connecting portion 210a has a first region 211 extending beyond the top sealing edge 110 and a second region 212 located within the top sealing edge 110. The second region 212 is connected to the top sealing edge 110 through an insulating member 300. The battery may also include a first tab 400 and a second tab 500 with opposite polarities. Both the first tab 400 and the second tab 500 are connected to the battery cell, and both the first tab 400 and the second tab 500 extend out of the housing 100 from the top sealing edge 110.

[0076] One of the first electrode tab 400 and the second electrode tab 500 is connected to the second connecting portion 210b via a first adapter piece 240. The second connecting portion 210b is raised relative to the first connecting portion 210a so that after the second connecting portion 210b is connected to the first adapter piece 240, the first adapter piece 240 can be raised relative to the top sealing edge 110, thereby facilitating the welding of the first adapter piece 240 to either the first electrode tab 400 or the second electrode tab 500, and making it easier to connect to the first electrode tab 400. The current is drawn out from the second tab 500 or the second contact piece 230. The second contact piece 230 may include a third connecting part 230a and a fourth connecting part 230b that are connected to each other. The third connecting part 230a and the fourth connecting part 230b are offset in the second direction. The fourth connecting part 230b is provided with a contact 231. The contact 231 can selectively contact or separate from the second connecting part 210b to control the connection and disconnection between the battery and the external circuit. The third connecting part 230a is connected to the second adapter piece 250.

[0077] Since the first contact piece 210 is made of metal such as copper, the first contact piece 210 is conductive. The first region 211 is exposed outside the top sealing edge 110. If it is not insulated, it is easy to cause a short circuit in the battery. Therefore, in this embodiment, the insulating member 300 at least partially covers the first region 211 to reduce the exposure of the first region 211, or the insulating member 300 completely covers the first region 211 to eliminate the exposure of the first region 211, thereby preventing a short circuit in the battery.

[0078] Understandably, since the insulating component 300 needs to bond the second region 212 to the top sealing edge 110, the surface of the insulating component 300 facing the top sealing edge 110 needs to have high adhesion. That is, the surface of the insulating component 300 facing the top sealing edge 110 is provided with a first insulating region 310. The first insulating region 310 has high initial adhesion to fix the first contact piece 210 to the top sealing edge 110 together through adhesive force, thereby reliably installing the first contact piece 210 onto the top sealing edge 110. This allows the temperature sensing element to promptly and accurately sense and detect the battery temperature, thereby ensuring that the protection component 200 can quickly break the circuit when the battery malfunctions, thus protecting the safety of battery use.

[0079] To prevent foreign matter from adhering to the surface of the insulating component 300 facing the top sealing edge 110, a second insulating region 320 is provided on the surface of the insulating component 300 facing the top sealing edge 110. The second insulating region 320 has lower adhesion, that is, the initial adhesion of the second insulating region 320 is lower than the initial adhesion of the first insulating region 310. In this way, the adhesion of other substances to the insulating component 300 due to part of the structure of the insulating component 300 extending beyond the top sealing edge 110 can be reduced, thus affecting the battery manufacturing yield. In addition, the second insulating region 320 can partially or completely cover the first region 211, so that the second insulating region 320 can provide insulation protection for the first connection portion 210a extending beyond the top sealing edge 110.

[0080] The initial tack force can be obtained by the probe contact test. A small stainless steel needle-shaped cylinder (probe) is used to contact the first insulation area and the second insulation area with the same pressure, and the maximum separation force is recorded. This maximum separation force can be regarded as the initial tack force.

[0081] In some embodiments, the first contact piece 210 may also be a flat sheet structure. One end of the first contact piece 210 is connected to the first adapter piece 240, and the other end of the first contact piece 210 is bonded to the top sealing edge 110. The first contact piece 210 includes a first region 211 and a second region 212. The first region 211 extends beyond the top sealing edge 110, and the second region 212 is located inside the top sealing edge 110. The first region 211 can be covered by the second insulating region 320, thereby preventing the side of the first region 211 away from the first adapter piece 240 from being exposed, thus preventing the battery from short-circuiting.

[0082] In this embodiment of the battery, the narrower top sealing edge 110 increases the battery's energy density. The first contact piece 210 includes a first region 211 extending beyond the top sealing edge 110 and a second region 212 overlapping the top sealing edge 110. Since the insulating member 300 covers the first region 211, it provides insulation protection, preventing the first region 211 from being exposed and thus preventing a short circuit. Because the insulating member 300 has a first insulating region 310 on its surface facing the top sealing edge 110, and the first insulating region 310 has high adhesion, the second region 212 can be bonded to the top sealing edge 110 through the first insulating region 310. This allows the protection component 200 to be installed on the top sealing edge 110, enabling the first contact piece 210 to promptly and accurately sense the battery temperature, thereby allowing the protection component 200 to accurately control the on / off state of the cell and external circuitry. Furthermore, since the insulating component 300 has a second insulating region 320 on the side facing the top seal edge 110, and the second insulating region 320 is at least partially exposed outside the top seal edge 110, the second insulating region 320 is non-adhesive or has low adhesion, so that the second insulating region 320 can effectively prevent other substances from adhering to the insulating component 300, thereby avoiding a reduction in battery production efficiency and yield. Therefore, the battery of this application has relatively high energy density, safety, and manufacturing yield.

[0083] Reference Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 As shown, in some embodiments, the insulating member 300 includes a first adhesive layer 300b, a substrate layer 300a, and a second adhesive layer 300d stacked along a second direction. On the side of the insulating member 300 away from the battery cell along the first direction, a portion of the substrate layer 300a extends beyond the first adhesive layer 300b, and the surface of this portion of the substrate layer 300a away from the second adhesive layer 300d forms a second insulating region 320.

[0084] in, Figure 8 This illustration shows a design where the upper end of the substrate layer 300a extends beyond the first adhesive layer 300b. Figure 10 , Figure 11 It indicated Figure 8 The insulating component 300 shown is used in a battery solution. Figure 10 In the middle, the upper end of the first adhesive layer 300b does not extend beyond the top sealing edge 110. Figure 11 In the middle, the upper end of the first adhesive layer 300b is flush with the top sealing edge 110.

[0085] In another implementation, the two may not be flush. Figure 9 This illustration shows a scheme where the upper end of the substrate layer 300a extends beyond both the first adhesive layer 300b and the second adhesive layer 300d. Figure 12 It indicated Figure 9 The insulating component 300 shown is used in a battery design.

[0086] Reference Figure 13 , Figure 14 , Figure 15 , Figure 16 As shown, in one possible implementation, the insulating member 300 includes a substrate layer 300a, a first adhesive layer 300b, an adhesive barrier layer 300c, and a second adhesive layer 300d stacked along the second direction. The surface of the adhesive barrier layer 300c facing away from the substrate layer 300a forms a second insulating region 320.

[0087] In other words, when the first adhesive layer 300b extends beyond the top sealing edge 110, in order to reduce and prevent other substances from adhering to the first adhesive layer 300b, a barrier layer 300c can be provided on the first adhesive layer 300b. This ensures that after this portion of the first adhesive layer 300b is covered by the barrier layer 300c, it no longer has adhesiveness, thereby preventing other substances from adhering to the insulating component 300 and affecting the battery manufacturing yield. Figure 8 , Figure 9 It is difficult to completely remove the first adhesive layer 300b beyond the top sealing edge 110 from the insulation component, thus posing a risk of other substances adhering. In contrast, the insulation component 300 with the adhesive barrier layer 300c... Figure 8 , Figure 9 The proposed solution is easier to implement, has lower processing difficulty, lower cost, higher efficiency, and is easier to achieve. Therefore, in the implementation method, the insulating component 300 with the adhesive barrier layer 300c is preferred.

[0088] Among them, reference Figure 7 As shown, along the first direction, the width W1 of the adhesive barrier layer 300c is smaller than the width W2 of the first adhesive layer 300b, so as to prevent the adhesive barrier layer 300c from completely covering the first adhesive layer 300b, thereby ensuring that the first adhesive layer 300b effectively bonds the second area 212 and the top sealing edge 110, thus ensuring the installation reliability of the first contact piece 210.

[0089] In one possible implementation, along the first direction, the width W1 of the adhesive barrier layer 300c and the width W2 of the first adhesive layer 300b satisfy: W1 / W2≤0.5.

[0090] In this way, on the one hand, it can be ensured that the adhesive barrier layer 300c can fully cover the first adhesive layer 300b, thereby forming a sufficiently wide second insulating area 320, thus ensuring that the insulating component 300 will not adhere to any other substances besides the first contact piece 210 and the top sealing edge 110.

[0091] On the other hand, it can ensure the bonding area between the first adhesive layer 300b and the top sealing edge 110, thereby ensuring the bonding force between the insulating component 300 and the top sealing edge 110, and thus ensuring that the protective component 200 can be better fixed on the top sealing edge 110, so as to accurately detect whether the battery temperature is abnormal.

[0092] In some embodiments, the insulating member 300 has a first thickness and a second thickness, the first thickness corresponding to the location of the first insulating region 310, the second thickness corresponding to the location of the second insulating region 320, and the second thickness being greater than the first thickness.

[0093] In other words, when the insulating component 300 is provided with a baffle layer 300c on the side away from the first contact piece 210, and a second insulating region 320 is formed through the baffle layer 300c, the insulating component 300 at the location of the second insulating region 320 will be thickened, resulting in a relationship where the second thickness is greater than the first thickness.

[0094] In some embodiments, the dimension W1 of the adhesive barrier layer 300c along the first direction satisfies: 0.2 mm ≤ W1 ≤ 2 mm. This configuration allows the width of the adhesive barrier layer 300c to match the width of the first region 211, thereby ensuring that the second insulating region 320 at least partially or completely covers the first region 211.

[0095] For example, the dimension W1 of the adhesive barrier layer 300c along the first direction can be any one of 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 0.9 mm, and 1 mm, or fall within any two of these values.

[0096] In some embodiments, the dimension H1 of the adhesive barrier layer 300c along the second direction satisfies: 0.01 mm ≤ H1 ≤ 0.3 mm. This setting allows the adhesive barrier layer 300c to have a certain thickness, thereby ensuring that the adhesive barrier layer 300c will not be damaged, thus preventing the exposure of the first adhesive layer 300b. Furthermore, it prevents the adhesive barrier layer 300c from being too thick, thereby preventing the adhesive barrier layer 300c from protruding beyond the top sealing edge 110 in the second direction, thus ensuring that the adhesive barrier layer 300c will not interfere with other components when the battery is assembled to an external device.

[0097] For example, the dimension H1 of the adhesive barrier layer 300c along the second direction can be any one of 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.9 mm, 0.1 mm, 0.2 mm, or 0.3 mm, or fall within any two of these values.

[0098] In some implementations, the adhesive barrier layer 300c includes a third region and a fourth region. Along the second direction, the projection of the third region overlaps with the projection of the top sealing edge 110, and the projection of the fourth region is located outside the projection of the top sealing edge 110. Along the first direction, the size W3 of the third region satisfies: W3≤0.5mm.

[0099] In other words, a portion of the adhesive barrier layer 300c is sandwiched between the top sealing edge 110 and the first adhesive layer 300b, which is the third region. Another portion of the adhesive barrier layer 300c is located outside the top sealing edge 110, which is the fourth region. The dimension W3 of the third region along the first direction is less than 0.5 mm to avoid affecting the overall dimension of the battery in the second direction.

[0100] In some embodiments, along the second direction, the projection of the adhesive barrier layer 300c is offset from the projection of the top sealing edge 110, and along the first direction, the distance W4 between the adhesive barrier layer 300c and the top sealing edge 110 satisfies: W4 ≤ 0.5 mm. This ensures that the adhesive barrier layer 300c can fully cover the first adhesive layer 300b, thereby preventing excessive exposure of the first adhesive layer 300b and thus preventing the first adhesive layer 300b from adhering to other substances or components, thereby reducing the battery manufacturing yield.

[0101] In one possible implementation, the first contact piece 210 includes a first connecting portion 210a and a second connecting portion 210b. The first connecting portion 210a and the second connecting portion 210b are offset in a second direction. The first region 211 and the second region 212 are both located in the first connecting portion 210a. Along the second direction, the projection of the first connecting portion 210a and the projection of the adhesive layer 300c at least partially overlap, and the projection area S1 of the overlapping portion and the projection area S2 of the first connecting portion 210a satisfy: S1 / S2≤0.5.

[0102] It should be noted that the adhesive barrier 300c can prevent foreign objects from adhering to the insulating component 300. However, due to the presence of the adhesive barrier 300c, it will affect the temperature sensing ability and speed of the first connecting part 210a to a certain extent. Therefore, in the specific setting, the overlapping area of ​​the projection of the first connecting part 210a and the adhesive barrier 300c should not be too large, and the relationship S1 / S2≤0.5 should be satisfied to ensure that the first connecting part 210a can sense the temperature of the battery in a timely and accurate manner.

[0103] In some embodiments, the protective component 200 further includes a thermal element 220, which is connected to the first connecting portion 210a. Along the second direction, the thermal element 220 is located on the side of the first connecting portion 210a facing away from the top sealing edge 110. The projection of the thermal element 220 at least partially overlaps with the projection of the adhesive barrier layer 300c, and the projection area S3 of the overlapping portion and the projection area S4 of the thermal element 220 satisfy: S3 / S4≤0.45.

[0104] Understandably, the thermistor 220 is also a temperature-sensing element. The first connection portion 210a absorbs heat from the casing 100 and transfers the heat to the thermistor 220, which can sense changes in the battery temperature. When the temperature rises to a certain level, the resistance of the thermistor 220 increases rapidly, thereby limiting the current and preventing the battery from being damaged due to excessive temperature.

[0105] In this embodiment, in order to ensure the temperature sensitivity of the thermal element 220, the overlapping area of ​​the projected thermal element 220 and the adhesive layer 300c cannot be too large, so as to avoid the response delay of the thermal element 220. When S4 and S3 satisfy the relationship S3 / S4≤0.45, it can be ensured that the thermal element 220 can sense the temperature of the battery in a timely and accurate manner.

[0106] In some embodiments, the average transmittance T of the barrier layer 300c in the visible light band is ≥70%.

[0107] It should be noted that the visible light band is defined as wavelengths of 400nm-760nm, corresponding to the red, green, blue and intermediate colors of light that the human eye can perceive. Transmittance refers to the ratio of the intensity of transmitted light to the intensity of incident light when light passes through a material.

[0108] Therefore, the average transmittance T≥70% in this embodiment means that the average transmittance values ​​of multiple wavelength points are calculated within the full visible light band of 400nm-760nm, and the final result must be greater than or equal to 70%.

[0109] In this way, it can be ensured that the adhesive barrier layer 300c does not significantly block visible light, so as to facilitate the observation and determination of the setting position of the adhesive barrier layer 300c, or to facilitate the identification of the adhesive barrier layer 300c by a CCD image sensor, etc., to confirm that the adhesive barrier layer 300c effectively covers the part of the first adhesive layer 300b that extends beyond the top sealing edge 110.

[0110] For example, the adhesive barrier layer 300c may be in a distinct red, green, or blue color to distinguish it from the translucent first adhesive layer 300b.

[0111] In some embodiments, the adhesive barrier layer 300c has a first transmittance T1 at a first wavelength λ1, and the adhesive barrier layer 300c has a second transmittance T2 at a second wavelength λ2, wherein the first wavelength λ1... 1、 The second wavelength λ2 satisfies: |λ1-λ2|≥80nm, and the first transmittance T1 and the second transmittance T2 satisfy: T1 / T2≥1.5.

[0112] Here, the first wavelength λ1 can be less than the second wavelength λ2, and the first wavelength λ1 can also be greater than the second wavelength λ2. Therefore, |λ1-λ2| refers to the absolute value of the difference between the first wavelength λ1 and the second wavelength λ2.

[0113] In this way, the barrier layer 300c can exhibit a significant difference in light transmittance at two sufficiently far apart wavelengths, rather than maintaining uniform light transmittance across the entire wavelength range as a highly transparent barrier layer 300c does. In other words, the barrier layer 300c has a distinct color and an opaque structure, making it easier to distinguish and detect the coverage of the barrier layer 300c over the first region 211.

[0114] In one possible implementation, the insulating element 300 further includes a second adhesive layer 300d, with the first adhesive layer 300b and the second adhesive layer 300d disposed on both sides of the substrate layer 300a, and the second adhesive layer 300d located on the side of the substrate layer 300a facing the first contact piece 210, so that the second adhesive layer 300d is bonded to the second region 212.

[0115] Along the first direction, the first adhesive layer 300b is flush with the second adhesive layer 300d, and along the third direction, the second adhesive layer 300d is flush with the substrate layer 300a. This reduces the manufacturing cost of the insulating component 300 and avoids material waste.

[0116] In some embodiments, along the first direction, the misalignment distance between the edge of the adhesive barrier layer 300c and the edge of the first adhesive layer 300b is less than or equal to 0.2 mm. Along the third direction, the misalignment distance between the edge of the adhesive barrier layer 300c and the edge of the first adhesive layer 300b is less than or equal to 0.2 mm.

[0117] Thus, within the allowable tolerance range, the misalignment distance between the adhesive barrier layer 300c and the first adhesive layer 300b in the length direction should be less than 0.2mm, and the misalignment distance between the adhesive barrier layer 300c and the first adhesive layer 300b in the width direction should be less than 0.2mm. Through high-precision alignment control, it is ensured that the adhesive barrier layer 300c fully covers the first adhesive layer 300b, thereby enabling the first insulation area 310 to effectively cover the first region 211.

[0118] In one possible implementation, the adhesive barrier layer 300c includes one of an imide film, a polyethylene terephthalate film, a polyvinyl chloride film, a nonwoven fabric, and foam.

[0119] These materials all have good high temperature resistance, which allows the adhesive barrier layer 300c to maintain structural stability under high temperature conditions, thus preventing the adhesive barrier layer 300c from deforming and falling off. Furthermore, after the adhesive barrier layer 300c is attached to the first adhesive layer 300b, it can effectively reduce the initial adhesion of the first insulating region 310.

[0120] In some embodiments, the adhesive barrier layer 300c has a first side, a transition side, and a second side that are sequentially adjacent to each other. The first side extends along a first direction, and the second side extends along a third direction. The adhesive barrier layer 300c is arc-shaped in the region of the transition side. In this way, the arc transition between the first side and the second side can effectively reduce the generation of burrs when the insulating component 300 is die-cut, thereby avoiding burrs from affecting the safety of the battery. On the other hand, the arc-shaped arrangement of the adhesive barrier layer 300c in the region of the transition side can prevent the sharp corners of the adhesive barrier layer 300c from being subjected to excessive stress when expanded or squeezed, which could cause the adhesive barrier layer 300c to deform or fall off, thus failing to effectively cover the first region 211.

[0121] Among them, the first direction, the second direction, and the third direction are perpendicular to each other, and the third direction can be referred to as the Z direction in the attached figure.

[0122] It should be noted that the transition edge can be set close to the first adapter piece 240, or the transition edge can be set close to the second adapter piece 250. This application embodiment does not limit this.

[0123] In one possible implementation, the battery further includes a first tab 400, which is connected to the cell and extends out of the top seal edge 110 in a first direction.

[0124] The protection component 200 includes a second contact piece 230, a first adapter piece 240, and a second adapter piece 250. The second contact piece 230 includes a first end and a second end. The first end of the second contact piece 230 is detachably connected to or disconnected from the second connecting portion 210b. The second end of the second contact piece 230 is electrically connected to the second adapter piece 250. The first adapter piece 240 is electrically connected to the second connecting portion 210b. The first tab 400 is electrically connected to one of the first adapter piece 240 and the second adapter piece 250.

[0125] The protective component 200 may further include a first protective element 260 and a second protective element 270, a first adapter piece 240 being welded to a second connecting portion 210b, and the first protective element 260 covering the welding area of ​​the first adapter piece 240 and the second connecting portion 210b. In a second direction, the projection of the first protective element 260 at least partially overlaps with the projection of the adhesive barrier layer 300c.

[0126] The second adapter piece 250 is welded to the third connecting part 230a, and the second protective member 270 covers the welding area between the second adapter piece 250 and the third connecting part 230a to prevent the protrusions and burrs formed by welding from affecting the safety of the battery.

[0127] In the second direction, the projections of the first protective element 260 and the second protective element 270 at least partially overlap with the projection of the adhesive barrier layer 300c, forming double protection to prevent the solder stamp from piercing the first protective element 260 or the second protective element 270 and causing safety problems.

[0128] In some embodiments, along the second direction, the projection of the adhesive barrier layer 300c at least partially coincides with the projection of the top sealing edge 110, and along the first direction, the upper edge of the adhesive barrier layer 300c near the first tab 400 extends beyond the upper edge of the first connecting portion 210a near the first tab 400.

[0129] In this way, the adhesive barrier layer 300c extends beyond the first region 211 in the first direction, thereby enabling the adhesive barrier layer 300c to completely cover the first region 211, thereby improving the insulation protection effect of the insulating component 300 on the first connection portion 210a and effectively preventing the insulating component 300 from sticking to other substances.

[0130] In one possible implementation, the battery further includes a first welding portion that connects the first tab 400 to one of the first adapter piece 240 and the second adapter piece 250, wherein the projection of the first welding portion is located within the projection of the adhesive layer 300c along the second direction.

[0131] Thus, after the top sealing edge 110 is narrowed, the adhesive layer 300c can provide enhanced protection for the first welded part, so as to prevent the first welded part from contacting the housing 100. Since the housing 100 uses aluminum-plastic film, if the first welded part comes into contact with the aluminum layer of the aluminum-plastic film, it will cause corrosion or puncture of the aluminum-plastic film, resulting in leakage.

[0132] In one possible implementation, a first tab adhesive is provided on the first tab 400, the first tab adhesive is connected to the top sealing edge 110, and at least a portion of the first tab adhesive extends out of the top sealing edge 110 along the first direction, thereby encapsulating the first tab 400 on the top sealing edge 110, and the first tab adhesive and the projection of the adhesive barrier layer 300c in the second direction at least partially overlap.

[0133] In this way, the partial adhesive layer 300c can be placed between the first tab adhesive and the first region 211, which can increase the distance between the first tab adhesive and the first contact piece 210 in the second direction. In addition, during the drop test, the adhesive layer 300c can play a buffering role, preventing the first tab adhesive from directly impacting the first connecting part 210a and causing it to deform and fail.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized by, The application relates to a battery protection assembly. The battery protection assembly comprises: a housing having a top edge located on one side of the housing along a first direction; a battery cell arranged in the housing; a protection assembly electrically connected to the battery cell, the protection assembly being arranged on the top edge, the protection assembly comprising a first contact sheet, the first contact sheet comprising a first region and a second region, a projection of the first region being located outside a projection of the top edge along a second direction, and a projection of the second region being located inside the projection of the top edge along the second direction; an insulating piece arranged between the top edge and the first contact sheet to connect the top edge and the first contact sheet; a side surface of the insulating piece facing the top edge comprises a first insulating region and a second insulating region, the second insulating region being arranged away from the top edge along the first direction relative to the first insulating region, at least part of the second insulating region covering the first region, and the first insulating region having a greater initial adhesion than the second insulating region; 2. The battery of claim 1, wherein, wherein the second direction is along a thickness direction of the battery, and the first direction is perpendicular to the second direction. The insulating piece comprises a substrate layer, a first adhesive layer and a glue-blocking layer arranged in a stack along the second direction; 3. The battery of claim 2, wherein, a surface of the glue-blocking layer away from the substrate layer constitutes the second insulating region, and a width W1 of the glue-blocking layer along the first direction is less than a width W2 of the first adhesive layer. The width W1 of the glue-blocking layer along the first direction and the width W2 of the first adhesive layer satisfy the condition W1 / W2<=0.5; and / or, the insulating piece has a first thickness corresponding to a position of the first insulating region and a second thickness corresponding to a position of the second insulating region, the second thickness being greater than the first thickness; and / or, a dimension W1 of the glue-blocking layer along the first direction satisfies the condition 0.2mm<=W1<=2mm; 4. The battery of claim 2, wherein, and / or, a dimension H1 of the glue-blocking layer along the second direction satisfies the condition 0.01mm<=H1<=0.3mm. The glue-blocking layer comprises a third region and a fourth region, a projection of the third region overlaps a projection of the top edge along the second direction, and a projection of the fourth region is located outside the projection of the top edge, a dimension W3 of the third region along the first direction satisfying the condition W3<=0.5mm; 5. The battery of claim 2, wherein, alternatively, a projection of the glue-blocking layer is staggered relative to a projection of the top edge along the second direction, and a spacing W4 of the glue-blocking layer to the top edge along the first direction satisfies the condition W4<=0.5mm. The first contact sheet comprises a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being arranged staggered relative to each other along the second direction, and the first region and the second region being located in the first connecting portion; a projection of the first connecting portion overlaps at least part of a projection of the glue-blocking layer along the second direction, and a projection area S1 of the overlapping part, and a projection area S2 of the first connecting portion satisfy the condition S1 / S2<=0.

5. The protection assembly further comprises a heat-sensitive element connected with the first connecting part and located on the side of the first connecting part away from the top sealing edge in the second direction, a projection of the heat-sensitive element at least partially overlaps a projection of the glue-blocking layer, and a projection area S3 of the overlapping part, a projection area S4 of the heat-sensitive element satisfy S3 / S4≤0.

45.

6. The battery of claim 2, wherein, In the visible light band range, the average transmittance T of the glue-blocking layer in the visible light band is greater than or equal to 70%. And / or, the glue-blocking layer has a first transmittance T1 at a first wavelength λ1, and a second transmittance T2 at a second wavelength λ2, the first wavelength λ1 and the second wavelength λ2 satisfy: |λ1-λ2|≥80nm, the first transmittance T1 and the second transmittance T2 satisfy: T1 / T2≥1.

5. 1、 Second wavelength λ2, satisfy: |λ1-λ2|≥80nm, the first transmittance T1, the second transmittance T2 satisfy: T1 / T2≥1.

5.

7. The battery of claim 2, wherein, The insulating element further comprises a second adhesive layer, the first adhesive layer and the second adhesive layer are arranged on both sides of the substrate layer, and the second adhesive layer is arranged on the side of the substrate layer facing the first contact sheet; In the first direction, the first adhesive layer is flush with the second adhesive layer; In the third direction, the second adhesive layer is flush with the substrate layer; In the first direction, the edge of the glue-blocking layer is misaligned with the edge of the first adhesive layer by a distance less than or equal to 0.2 mm; In the third direction, the edge of the glue-blocking layer is misaligned with the edge of the first adhesive layer by a distance less than or equal to 0.2 mm; The first direction, the second direction and the third direction are perpendicular to each other.

8. The battery of claim 2, wherein The glue-blocking layer comprises one of an imide film, a polyethylene terephthalate film, a polyvinyl chloride film, a non-woven fabric, and a foam; In the first direction, the edge of the glue-blocking layer is misaligned with the edge of the first adhesive layer by a distance less than or equal to 0.2 mm; The first direction, the second direction and the third direction are perpendicular to each other.

9. The battery of claim 5, wherein, The battery further comprises a first tab, the first tab is connected with the battery cell, and the first tab extends out of the top sealing edge in the first direction; The protection assembly comprises a second contact sheet, a first adapter sheet and a second adapter sheet, the second contact sheet comprises a first end and a second end, the first end of the second contact sheet is detachably connected or disconnected with the second connecting part, the second end of the second contact sheet is electrically connected with the second adapter sheet, the first adapter sheet is electrically connected with the second connecting part, and the first tab is electrically connected with one of the first adapter sheet and the second adapter sheet; In the second direction, a projection of the glue-blocking layer at least partially overlaps a projection of the top sealing edge, and in the first direction, an upper edge of the glue-blocking layer close to the first tab exceeds an upper edge of the first connecting part close to the first tab.

10. The battery of claim 9, wherein, Further comprising a first welding part connecting the first tab with one of the first adapter sheet and the second adapter sheet, and in the second direction, a projection of the first welding part is located within a projection of the glue-blocking layer; The first tab is provided with a first tab adhesive, the first tab adhesive is connected with the top sealing edge, and at least part of the first tab adhesive extends out of the top sealing edge in the first direction, and a projection of the first tab adhesive in the second direction at least partially overlaps the blocking adhesive layer.

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