Battery cell assembly and battery

Abstract

The application provides an electric cell assembly and a battery. The electric cell assembly comprises a cell package, a tab connected to the cell package, a cover plate, the tab being located between the cover plate and the cell package along a first direction, and a spacer configured to form a separation between the tab and a battery shell. The spacer comprises a first adapting part, a second adapting part, and a connecting part. The first adapting part is arranged on the tab along a second direction. The second adapting part is arranged on at least part of the cell package along the second direction. The connecting part is connected to one side of the first adapting part away from the second adapting part, and the connecting part is fixedly connected to the cover plate. The second direction intersects the first direction. In the embodiment of the application, the second adapting part and the connecting part are respectively limited in movement. Since the first adapting part is located between the second adapting part and the connecting part, both sides of the first adapting part are constrained, the stability of the spacer is improved, the possibility of displacement of the spacer is reduced, and the protection effect on the tab is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a cell assembly and a battery. Background Technology

[0002] Currently, lithium batteries typically consist of core components such as the cell pack, tabs, cover plate, and casing. Among these, the tabs are key conductive components that connect the terminals on the cell pack and cover plate to enable current output. Since the casing is usually made of metal, direct contact between the tabs and the casing can easily cause an internal short circuit.

[0003] To achieve effective isolation between the tab and the housing, related technologies involve attaching protective adhesive paper to the surface of the tab to isolate it from the housing; however, the protective adhesive paper has poor adhesion stability on the surface of the tab and is prone to falling off, affecting the protective effect on the tab. Utility Model Content

[0004] The embodiments of this application provide a cell assembly and a battery to at least partially solve the above-mentioned technical problems.

[0005] In a first aspect, embodiments of this application provide a battery cell assembly, comprising:

[0006] Core package;

[0007] The tab is connected to the core package;

[0008] A cover plate, wherein the electrode tab is located between the cover plate and the core package along a first direction;

[0009] The separator is configured to provide isolation between the tab and the battery casing;

[0010] The isolation component includes:

[0011] A first adapter portion is disposed on the electrode tab along the second direction;

[0012] The second adapter is disposed on at least a portion of the core package along the second direction;

[0013] A connecting portion is connected to the side of the first adapter portion away from the second adapter portion, and the connecting portion is fixedly connected to the cover plate;

[0014] The second direction intersects with the first direction.

[0015] By adopting the above scheme, through the setting of the first adapter, the second adapter, and the connecting part, the first adapter is covered on the tab to protect it, while the second adapter, after being inserted into the casing with the core pack, can be restricted in its movement by the core pack and the battery casing. The connecting part is fixedly connected to the cover plate to restrict the movement of the connecting part. Since the first adapter is located between the second adapter and the connecting part, both sides of the first adapter are constrained, which improves the stability of the separator, reduces the possibility of the separator shifting, and thus improves the protection effect on the tab.

[0016] Optionally, in some embodiments of this application, the connecting portion is bent relative to the first adapter portion;

[0017] On a projection plane perpendicular to the first direction, the projection of the connecting portion at least partially overlaps with the projection of the cover plate.

[0018] By adopting the above solution, since the tab is located between the inner side of the core package and the cover plate facing the core package, and the connecting part is bent relative to the first adapter part, the insulating member can better adapt to the relative spatial position of the cover plate and the tab. At the same time, by limiting the projection relationship between the connecting part and the cover plate in the first direction, it can be ensured that the connecting part and the cover plate have sufficient contact area, thereby improving the connection stability between the connecting part and the cover plate.

[0019] Optionally, in some embodiments of this application, the electrode tab includes a positive electrode tab and a negative electrode tab;

[0020] On a projection plane perpendicular to the second direction, the projections of the positive electrode and the negative electrode are located within the same projection of the first adapter.

[0021] By adopting the above scheme, by defining the projection relationship between the positive tab and the negative tab and the same first adapter in the second direction, the same first adapter can simultaneously form the isolation between the positive tab and the negative tab and the battery casing, which facilitates the assembly of the isolation component.

[0022] Optionally, in some embodiments of this application, at least a portion of the connecting portion is bonded to the cover plate.

[0023] Using the above solution, the connecting part is fixedly connected to the cover plate by adhesive bonding, which eliminates the need to apply mechanical pressure to the connecting part, is less likely to damage the isolation component, adapts well to the structure of the cover plate, and has high assembly efficiency.

[0024] Optionally, in some embodiments of this application, in a third-party aspect, the size of the connecting portion is smaller than the size of the first adapter portion;

[0025] The third direction intersects with the first direction and the second direction, respectively.

[0026] By adopting the above solution, since the space available for the connection part on the cover plate is limited, by limiting the size of the third upward connection part to be smaller than the size of the first adapter part, the coverage effect of the first adapter part on the electrode tab can be guaranteed, while avoiding interference between the connection part and other structures of the cover plate.

[0027] Optionally, in some embodiments of this application, the battery cell assembly further includes:

[0028] The pole is installed onto the cover plate;

[0029] The isolation element has:

[0030] A first clearance space extends through the connecting portion along the first direction;

[0031] At least a portion of the pole is located in the first clearance space.

[0032] By adopting the above solution and setting the first clearance space, the connecting part can avoid the position of the pole post, so that the connecting part can be better connected to the cover plate.

[0033] Optionally, in some embodiments of this application, the battery cell assembly further includes:

[0034] An explosion-proof valve is installed on the cover plate;

[0035] The isolation element has:

[0036] The second clearance space extends through the connecting portion along the first direction;

[0037] At least a portion of the explosion-proof valve is located in the second clearance space.

[0038] By adopting the above solution and setting the second clearance space, the connecting part can avoid the position of the pole post, so that the connecting part can be better connected to the cover plate.

[0039] Optionally, in some embodiments of this application, in the second direction, at least two of the first adapters are connected to both sides of the same connecting portion.

[0040] By adopting the above scheme, at least two first adapters are connected through the same connecting part, so that the connection between the connecting part and the cover plate can realize the isolation of the electrode tabs on both sides in the second direction from the battery casing, thereby improving assembly efficiency.

[0041] Optionally, in some embodiments of this application, the second adapter has:

[0042] At least two liquid passage holes extend through the second adapter portion along the second direction.

[0043] By adopting the above solution and setting the liquid passage holes, the influence of the separator on the electrolyte wettability of the core package can be avoided.

[0044] Optionally, in some embodiments of this application, adjacent liquid passage holes are aligned or staggered in the connection direction between the first adapter and the second adapter.

[0045] Using the above scheme, the arrangement of adjacent liquid passage holes is relatively simple and facilitates the processing of the liquid passage holes.

[0046] With two adjacent liquid passage holes staggered, the electrolyte is more likely to enter the core package evenly through multiple liquid passage holes in the connection direction of the first adapter and the second adapter.

[0047] Optionally, in some embodiments of this application, the size of the second adapter portion ranges from 3 mm to 25 mm in the connection direction between the first adapter portion and the second adapter portion.

[0048] By adopting the above solution, the size range of the second adapter is limited, which ensures the fixing effect of the second adapter while avoiding the second adapter occupying too much space in the battery casing and affecting the energy density of the battery.

[0049] Optionally, in some embodiments of this application, the thickness of the separator ranges from 0.08 mm to 0.5 mm.

[0050] By adopting the above solution, the thickness range of the separator is limited, which ensures the high temperature resistance and structural strength of the separator, while avoiding the separator occupying too much space in the battery casing and affecting the energy density of the battery.

[0051] Secondly, embodiments of this application provide a battery, including a battery casing and a cell assembly as described above;

[0052] The cell assembly is mounted on the battery casing. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0054] Figure 1 This is a schematic diagram of the structure of the battery cell assembly provided in an embodiment of this application;

[0055] Figure 2This is a perspective view of a portion of the battery cell assembly provided in an embodiment of this application;

[0056] Figure 3 This is a schematic diagram of the structure of the separator in the battery cell assembly provided in an embodiment of this application;

[0057] Figure 4 This is a schematic diagram of another type of isolation component in the battery cell assembly provided in an embodiment of this application;

[0058] Figure 5 This is a schematic diagram of another type of isolation component in the battery cell assembly provided in an embodiment of this application;

[0059] Figure 6 This is an unfolded view of the separator in the battery cell assembly provided in the embodiments of this application;

[0060] Figure 7 This is an unfolded view of another type of separator in the battery cell assembly provided in the embodiments of this application.

[0061] Explanation of reference numerals in the attached figures:

[0062] 100. Battery cell assembly;

[0063] 110. Core package; 120. Tab; 121. Positive tab; 122. Negative tab; 130. Cover plate; 131. Protrusion;

[0064] 140. Isolator; 141. First adapter; 142. Second adapter; 142a. Liquid passage hole; 143. Connecting part; 143a. First clearance space; 143b. Second clearance space;

[0065] 150. Pole post; 160. Explosion-proof valve; 170. Liquid injection structure. Detailed Implementation

[0066] 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. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application.

[0067] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operating state, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". The terms first, second, third, etc., are used merely as illustrative purposes and do not impose numerical requirements or establish a numerical order.

[0068] In this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0069] As a connecting component inside a lithium battery, the tab connects to the cell pack at one end and to the current collector or terminal post on the cover plate at the other end. The tab is under dynamic stress at different stages of battery life. For example, during cell pack insertion and cover plate welding, the tab may be stretched or bent due to cell pack positioning adjustments and welding stress. During charge / discharge cycles, the cell pack undergoes slight deformation due to expansion or contraction, causing the tab to shift synchronously. If the battery is subjected to external impacts such as vibration or compression, the tab will also be subjected to lateral or longitudinal shear forces. In related technologies, protective adhesive paper is pasted on the surface of the tab to isolate it from the battery casing. However, the dynamic stress on the tab continuously acts on the adhesion interface between the protective adhesive paper and the tab, resulting in poor adhesion stability of the protective adhesive paper on the tab surface, making it prone to detachment.

[0070] To solve the above technical problems, firstly, referring to... Figures 1 to 3 This application provides a battery cell assembly 100, including: a core pack 110, a tab 120, a cover plate 130, and an insulating member 140.

[0071] The core pack 110 is composed of at least a positive electrode, a negative electrode, and a separator. The tab 120 is connected to the core pack 110 and is located between the cover plate 130 and the core pack 110 along a first direction to connect the current collector or terminal post 150 on the cover plate 130 to realize the current transmission between the core pack 110 and the outside. The separator 140 is configured to form an isolation between the tab 120 and the battery casing to avoid direct contact between the tab 120 and the battery casing.

[0072] It is understood that the first direction in the embodiments of this application may be the spatial arrangement direction of the cover plate 130 and the core package 110.

[0073] Specifically, the insulating member 140 includes a first adapter 141, a second adapter 142, and a connecting portion 143. The first adapter 141 is disposed on the tab 120 along a second direction; the second adapter 142 is disposed on at least a portion of the core package 110 along the second direction; the connecting portion 143 is connected to the side of the first adapter 141 away from the second adapter 142, and the connecting portion 143 is fixedly connected to the cover plate 130. The second direction intersects the first direction, and more specifically, the second direction intersects the first direction at an angle or is perpendicular to it.

[0074] It is understood that the first adapter 141 is covered on the tab 120 to protect the tab 120 and prevent the tab 120 from directly contacting the battery casing, thereby reducing the risk of internal short circuit in the battery; the second adapter 142 is covered on at least a portion of the core pack 110. After the separator 140 and the core pack 110 are placed into the battery casing, the second adapter 142 is sandwiched between the core pack 110 and the inner wall of the battery casing, which can reduce the mobility of the second adapter 142 and thus improve the stability of the separator 140.

[0075] It should be noted that the overlay in this embodiment is to indicate the relative positional relationship between the first adapter 141 and the tab 120 in the second direction, and the relative positional relationship between the second adapter 142 and the core package 110 in the second direction, and does not constitute a limitation on whether the insulating member 140 is in direct contact with the tab 120 and the core package 110.

[0076] Since the cover plate 130 is typically made of metals such as aluminum alloy or stainless steel, its dimensions and shape are fixed after molding, with no significant deformation capability. Furthermore, the cover plate 130 is rigidly connected to the battery casing via welding or mechanical sealing, remaining static throughout the battery's lifespan and not displacing due to cell expansion, contraction, or external impacts. This means the cover plate 130 only bears the static pressure inside the battery (such as the minute gas pressure generated by electrolyte evaporation), exerting no dynamic tensile, bending, or shearing force on the separator 140. The connection 143, fixedly attached to the cover plate 130, reduces the mobility of the connection 143, further improving the stability of the separator 140.

[0077] By adopting the above solution, through the arrangement of the first adapter 141, the second adapter 142, and the connecting part 143, the first adapter 141 covers the tab 120 to protect the tab 120, while the second adapter 142 covers at least a portion of the core pack 110. After being inserted into the casing with the core pack 110, its movement can be restricted by the core pack 110 and the battery casing. The connecting part 143 is fixedly connected to the cover plate 130, thereby restricting the movement of the connecting part 143. Since the first adapter 141 is located between the second adapter 142 and the connecting part 143, both sides of the first adapter 141 are constrained, improving the stability of the separator 140 and reducing the possibility of displacement of the separator 140, thereby improving the protective effect on the tab 120.

[0078] It should be noted that the first direction, indicating the up and down direction, is used here only for the convenience of introducing specific embodiments of this application. There is no absolute correspondence between the first direction and the up and down direction. Similarly, there is no absolute correspondence between the second direction and the front and back direction, and between the third direction and the left and right direction. Furthermore, the first direction, second direction, and third direction of this application are only used to express relative positional relationships; they only indicate approximate locations, not absolute geometric relationships.

[0079] To clearly demonstrate the overall structure of the spacer 140, Figures 2 to 5 The first adapter portion 141 and the second adapter portion 142 of the middle separator 140 are appropriately extended in the front-rear direction, and should not be construed as limiting the actual state of the separator 140 in the battery casing.

[0080] In some specific embodiments, the insulating material can be one of polypropylene (PP), polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC), etc. More specifically, the insulating material can be protective adhesive paper made of the above materials.

[0081] In some embodiments of this application, reference is made to Figure 1 and Figure 2 The connecting portion 143 is bent relative to the first adapter portion 141; on the projection plane perpendicular to the first direction, the projection of the connecting portion 143 at least partially overlaps with the projection of the cover plate 130.

[0082] With the above solution, since the tab 120 is located between the inner surfaces of the core package 110 and the cover plate 130 facing the core package 110, the connecting part 143 is bent relative to the first adapter part 141, allowing the insulating member 140 to better adapt to the relative spatial position of the cover plate 130 and the tab 120. Simultaneously, by limiting the projection relationship between the connecting part 143 and the cover plate 130 in the first direction, sufficient contact area between the connecting part 143 and the cover plate 130 can be ensured, improving the connection stability between the connecting part 143 and the cover plate 130.

[0083] In some embodiments of this application, reference is made to Figure 1 and Figure 3 The tab 120 includes a positive tab 121 and a negative tab 122. On the projection plane perpendicular to the second direction, the projection of the positive tab 121 and the projection of the negative tab 122 are located inside the projection of the same first adapter 141.

[0084] It is understood that, in the second direction, the area of ​​the first adapter 141 can simultaneously cover the positive tab 121 and the negative tab 122, so as to simultaneously isolate the positive tab 121 and the negative tab 122 from the battery casing.

[0085] By adopting the above solution, by defining the projection relationship between the positive tab 121 and the negative tab 122 and the same first adapter 141 in the second direction, the same first adapter 141 simultaneously constitutes the isolation between the positive tab 121 and the negative tab 122 and the battery casing, which facilitates the assembly of the isolation member 140.

[0086] In one example of this application, reference is made to Figure 1 The positive electrode tab 121 and the negative electrode tab 122 are spaced apart in the left and right directions. Correspondingly, the first adapter 141 extends in the direction so that the first adapter 141 can cover the positive electrode tab 121 and the negative electrode tab 122 at the same time.

[0087] In other embodiments of this application, reference is made to Figure 4 In the second direction, two independent first adapters 141 can be connected to the same side of the connecting part 143, one of which corresponds to the positive electrode tab 121 and the other corresponds to the negative electrode tab 122, which can improve the assembly flexibility of the isolator 140.

[0088] In some embodiments of this application, reference is made to Figure 2 At least a portion of the connecting part 143 is bonded to the cover plate 130.

[0089] Using the above solution, the connecting part 143 is fixedly connected to the cover plate 130 by adhesive bonding. There is no need to apply mechanical pressure to the connecting part 143, which is less likely to damage the isolation part 140. It also adapts well to the structure of the cover plate 130 and has high assembly efficiency.

[0090] In some specific embodiments, the connecting part 143 can be bonded to the cover plate 130 by at least a portion of the connecting part 143 being heat-melted, or a coating of colloid (e.g., thermoplastic resin) can be applied and then fixed after cooling to form the bonding and fixing of the connecting part 143 and the cover plate 130.

[0091] In some other embodiments of this application, physical structures can also be used to assist in fixing the connecting part 143 to the cover plate 130. For example, micro buckles can be provided on the edge of the cover plate 130 to form a mechanical limit; or plastic rivets can be designed for fixing; or pressure strips can be provided on the surface of the cover plate 130 to fix the connecting part 143.

[0092] In some embodiments of this application, reference is made to Figure 2 and Figure 3 In the third direction, the size of the connecting part 143 is smaller than the size of the first adapter part 141; the third direction intersects with the first direction and the second direction respectively; more specifically, the first direction, the second direction and the third direction intersect at an angle or are perpendicular to each other respectively.

[0093] By adopting the above solution, since the space available for the connecting part 143 on the cover plate 130 is limited, by limiting the size of the third-party upward connecting part 143 to be smaller than the size of the first adapter part 141, the isolation effect of the first adapter part 141 on the tab 120 can be guaranteed, while avoiding interference between the connecting part 143 and other structures of the cover plate 130.

[0094] In one example of this application, reference is made to Figure 2 The cover plate 130 has a protrusion 131, which can be inserted into the battery housing when the cover plate 130 is assembled with the battery housing. Since the dimension of the connecting part 143 along the third direction is smaller than the dimension of the first adapter part 141, the portion of the first adapter part 141 that protrudes relative to the connecting part 143 can cover the protrusion 131. Thus, after the cover plate 130 is assembled with the battery housing, this portion of the first adapter part 141 can be clamped between the protrusion 131 and the battery housing, further improving the stability of the separator 140.

[0095] In some embodiments of this application, reference is made to Figure 2 and Figure 3 The cell assembly 100 also includes: terminal post 150. Terminal post 150 is mounted to cover plate 130.

[0096] The separator 140 has a first clearance space 143a. The first clearance space 143a extends through the connecting portion 143 along a first direction; at least a portion of the pole post 150 is located in the first clearance space 143a. The size and shape of the first clearance space 143a can be adjusted according to the structural design of the pole post 150, and are not limited herein.

[0097] By adopting the above solution, the first clearance space 143a is provided so that the connecting part 143 can avoid the position of the pole post 150, so that the connecting part 143 can be better connected to the cover plate 130.

[0098] In some embodiments of this application, reference is made to Figure 2 and Figure 3 The battery cell assembly 100 also includes an explosion-proof valve 160. The explosion-proof valve 160 is mounted to the cover plate 130.

[0099] The isolation member 140 has a second clearance space 143b. The second clearance space 143b extends through the connection portion 143 along a first direction; at least a portion of the explosion-proof valve 160 is located in the second clearance space 143b. The size and shape of the second clearance space 143b can be adjusted according to the structural design of the explosion-proof valve 160, and are not limited herein.

[0100] By adopting the above solution, the second clearance space 143b is provided so that the connecting part 143 can avoid the position of the pole post 150, so that the connecting part 143 can be better connected to the cover plate 130.

[0101] In some embodiments of this application, reference is made to Figure 2 and Figure 3 The cell assembly 100 also includes an injection structure 170. The injection structure 170 is disposed on the cover plate 130, and at least a portion of the injection structure 170 is also located in the second clearance space 143b.

[0102] In one example of this application, reference is made to Figure 2 and Figure 3 In the left-right direction, the explosion-proof valve 160 is located between the two pole posts 150, and correspondingly, the second clearance space 143b is located between the two first clearance spaces 143a. Of course, the specific positions of the first clearance space 143a and the second clearance space 143b can also be designed according to the specific arrangement of the pole posts 150 and the explosion-proof valve 160.

[0103] In some embodiments of this application, reference is made to Figure 2 and Figure 3 In the second direction, at least two first adapters 141 are connected to both sides of the same connector 143.

[0104] It is understood that the isolator 140 includes two first adapters 141, and the connecting portion 143 of the same isolator 140 is connected between the two first adapters 141; in the same isolator 140, one of the first adapters 141 is located on one side of the tab 120 in the second direction, while the other first adapter 141 is located on the other side of the tab 120 in the second direction.

[0105] By adopting the above solution, at least two first adapters 141 are connected through the same connecting part 143, so that the connection of the connecting part 143 and the cover plate 130 can realize the isolation of the electrode tabs 120 on both sides in the second direction from the battery casing, thereby improving the assembly efficiency.

[0106] In one example of this application, in the second direction, the two first adapter portions 141 are symmetrically arranged relative to the connecting portion 143.

[0107] In other embodiments of this application, reference is made to Figure 5 The battery cell assembly 100 includes two isolators 140, with connecting portions 143 of the two isolators 140 respectively connected to a cover plate 130. In a second direction, the first adapter portion 141 of one isolator 140 is located on one side of the tab 120, and the first adapter portion 141 of the other isolator 140 is located on the other side of the tab 120, so that the two isolators 140 cooperate to protect the tab 120. In this embodiment, the two isolators 140 can be independently installed on the cover plate 130, reducing the precision requirements of the isolators 140 and improving the installation flexibility of the isolators 140.

[0108] In one example of this application, in the second direction, the two spacers 140 are symmetrically arranged opposite the connecting portion 143.

[0109] In some embodiments of this application, reference is made to Figure 1 and Figure 3 The second adapter 142 has a liquid passage hole 142a. At least two liquid passage holes 142a penetrate the second adapter 142 along a second direction.

[0110] It is understood that the number and shape of the liquid passage 142a can be selected according to the battery design requirements, and are not specifically limited here. For example, the shape of the liquid passage 142a can be at least one of the following: circular, polygonal, etc.

[0111] By adopting the above solution and setting the liquid passage 142a, the influence of the separator 140 on the electrolyte wettability of the core package 110 can be avoided.

[0112] In one example of this application, reference is made to Figure 1 and Figure 2 The liquid passage holes 142a are arranged in an array along the first direction and the third direction, respectively.

[0113] In some embodiments of this application, reference is made to Figure 6 In the connection direction of the first adapter 141 and the second adapter 142, two adjacent liquid passage holes 142a are aligned.

[0114] Using the above scheme, the arrangement of two adjacent liquid passage holes 142a is relatively simple and facilitates the processing of the liquid passage holes 142a.

[0115] In some embodiments of this application, reference is made to Figure 7 In the connection direction of the first adapter 141 and the second adapter 142, two adjacent liquid passage holes 142a are staggered.

[0116] By adopting the above scheme, the electrolyte is made easier to uniformly enter various positions of the core package 110 through multiple liquid passage holes 142a in the connection direction of the first adapter 141 and the second adapter 142 (that is, in the first direction) by staggering the two adjacent liquid passage holes 142a.

[0117] In some embodiments of this application, the second adapter 142 may cover a portion of the core package 110 in the vertical direction, or the second adapter 142 may completely cover the core package 110.

[0118] In some embodiments of this application, reference is made to Figure 6 In the connection direction of the first adapter 141 and the second adapter 142, the value of the dimension L2 of the second adapter 142 ranges from 3mm to 25mm.

[0119] It is understandable that, since the size of the second adapter 142 affects the coverage area of ​​the second adapter 142 on the core pack 110, if the size of the second adapter 142 is too small, the fixing effect of the second adapter 142 is poor, and the second adapter 142 is prone to shifting; if the size of the second adapter 142 is too small, the second adapter 142 occupies too much space in the battery casing, which affects the energy density of the battery.

[0120] In the connection direction of the first adapter 141 and the second adapter 142, the value range of the size L2 of the second adapter 142 can be at least one of 3mm to 4mm, 4mm to 5mm, 5mm to 7mm, 7mm to 10mm, 10mm to 12mm, 12mm to 14mm, 14mm to 16mm, 16mm to 18mm, 18mm to 20mm, 20mm to 22mm, 22mm to 24mm and 24mm to 25mm.

[0121] By adopting the above solution, by limiting the size range of the second adapter 142, the fixing effect of the second adapter 142 is ensured, while avoiding the second adapter 142 occupying too much space in the battery casing and affecting the energy density of the battery.

[0122] At the same time, by adopting the above-mentioned size range of the second adapter 142, the effect of the second adapter 142 on electrolyte penetration can be reduced while ensuring the fixing effect of the second adapter 142.

[0123] In one example of this application, in the connection direction of the first adapter 141 and the second adapter 142, the value of the size L2 of the second adapter 142 can range from 5mm to 20mm.

[0124] It should be noted that, in the connection direction of the connecting part 143, the first adapter part 141, and the second adapter part 142, the size L1 of the first adapter part 141 can be selected according to the size of the tab 120 in the first direction, and the size L3 of the connecting part 143 can be selected according to the size of the cover plate 130. No specific limitation is made here.

[0125] In some embodiments of this application, the thickness of the spacer 140 ranges from 0.08 mm to 0.5 mm.

[0126] It is understandable that if the thickness of the separator 140 is too small, its high-temperature resistance will decrease and its structural strength will be poor, making it easy to break. If the thickness of the separator 140 is too large, it will occupy too much of the internal space of the battery casing, affecting the energy density of the battery.

[0127] The thickness of the spacer 140 can be at least one of the following: 0.08 mm to 0.09 mm, 0.09 mm to 0.1 mm, 0.1 mm to 0.15 mm, 0.15 mm to 0.2 mm, 0.25 mm to 0.3 mm, 0.35 mm to 0.4 mm, 0.4 mm to 0.45 mm, and 0.45 mm to 0.5 mm.

[0128] By adopting the above solution, by limiting the thickness range of the separator 140, the high temperature resistance and structural strength of the separator 140 are guaranteed, while avoiding the separator 140 occupying too much space in the battery casing and affecting the energy density of the battery.

[0129] In one example of this application, the thickness of the spacer 140 can range from 0.1 mm to 0.2 mm.

[0130] Secondly, this application provides a battery, including a battery casing and the aforementioned cell assembly 100; the cell assembly 100 is mounted on the battery casing. This battery possesses all the beneficial effects of the aforementioned cell assembly 100, which will not be elaborated upon here.

[0131] Specifically, the cover plate 130 is fixedly connected to the battery housing, and the cover plate 130 and the battery housing cooperate to form an accommodating space. The first adapter 141 and the second adapter 142 are placed into the accommodating space along with the core pack 110. The first adapter 141 is shielded between the tab 120 and the battery housing, and the second adapter 142 is located between the core pack 110 and the battery housing.

[0132] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery cell assembly, characterized in that, include: Core package; The tab is connected to the core package; A cover plate, wherein the electrode tab is located between the cover plate and the core package along a first direction; The separator is configured to provide isolation between the tab and the battery casing; The isolation component includes: A first adapter portion is disposed on the electrode tab along the second direction; The second adapter is disposed on at least a portion of the core package along the second direction; A connecting portion is connected to the side of the first adapter portion away from the second adapter portion, and the connecting portion is fixedly connected to the cover plate; The second direction intersects with the first direction.

2. The battery cell assembly according to claim 1, characterized in that, The connecting portion is bent relative to the first adapter portion; On a projection plane perpendicular to the first direction, the projection of the connecting portion at least partially overlaps with the projection of the cover plate.

3. The battery cell assembly according to claim 1, characterized in that, The electrode includes a positive electrode and a negative electrode; On a projection plane perpendicular to the second direction, the projection of the positive electrode and the projection of the negative electrode are located within the same projection of the first adapter.

4. The cell assembly according to claim 1, characterized in that, At least a portion of the connecting part is bonded to the cover plate.

5. The battery cell assembly according to any one of claims 1 to 4, characterized in that, In the third direction, the size of the connecting part is smaller than the size of the first adapter part; The third direction intersects with the first direction and the second direction, respectively.

6. The cell assembly according to any one of claims 1 to 4, characterized in that, The battery cell assembly also includes: The pole is installed onto the cover plate; The isolation element has: A first clearance space extends through the connecting portion along the first direction; At least a portion of the pole is located in the first clearance space.

7. The cell assembly according to any one of claims 1 to 4, characterized in that, The battery cell assembly also includes: An explosion-proof valve is installed on the cover plate; The isolation element has: The second clearance space extends through the connecting portion along the first direction; At least a portion of the explosion-proof valve is located in the second clearance space.

8. The cell assembly according to any one of claims 1 to 4, characterized in that, In the second direction, at least two of the first adapters are connected to both sides of the same connector.

9. The cell assembly according to any one of claims 1 to 4, characterized in that, The second adapter has: At least two liquid passage holes extend through the second adapter portion along the second direction.

10. The cell assembly according to claim 9, characterized in that, In the connection direction between the first adapter and the second adapter, two adjacent liquid passage holes are aligned or staggered.

11. The cell assembly according to any one of claims 1 to 4, characterized in that, In the connection direction between the first adapter and the second adapter, the size of the second adapter ranges from 3mm to 25mm.

12. The cell assembly according to any one of claims 1 to 4, characterized in that, The thickness of the isolation element ranges from 0.08 mm to 0.5 mm.

13. A battery, characterized in that, Includes a battery casing and a cell assembly as described in any one of claims 1 to 12; The cell assembly is mounted on the battery casing.

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