An insulating protective assembly and an electric core

Abstract

The application relates to the technical field of batteries, and particularly discloses an insulation protection assembly and a battery cell. The insulation protection assembly comprises a detachably connected insulation film and an end plate. The insulation film comprises a cylinder part and a blocking part which are connected to each other, the cylinder part is formed with an opening at one end away from the blocking part in a first direction, and a combined electrode group is arranged in the insulation film through the opening. The end plate is connected to one end of the insulation film provided with the opening, the end plate and the insulation film form a relatively closed mounting space, the combined electrode group is stably fixed through the combination of the insulation film and the end plate, and displacement is not prone to occurring between an electrode group main body and an electrode group sub-body of the combined electrode group. Moreover, the insulation film and the end plate both have good insulation performance, and can insulate and separate the combined electrode group from the outside. The application further provides a battery cell comprising the above insulation protection assembly.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to an insulating protection component and a battery cell. Background Technology

[0002] Currently, the electrode assembly in a battery cell is typically designed as a single unit with planar end faces. This design cannot be adapted to the shape of the cover plate, resulting in low internal space utilization and smaller cell capacity and assembly ratio. If an abnormality occurs at the end of the electrode assembly, the entire assembly must be scrapped, leading to a sharp increase in cost. Furthermore, this integrated electrode assembly structure lacks platform compatibility, making it unsuitable for battery cells with the same cross-section but different lengths and end shapes. Individual molds must be created for each cell, further increasing costs.

[0003] Therefore, some modular pole assemblies that can be disassembled and reassembled have emerged. These modular pole assemblies consist of at least two detachable components, which are then assembled into a single unit. After the modular pole assembly is installed inside the cell housing, an insulating film is typically fitted over the assembly to insulate it from the housing. However, because the insulating film is cylindrical with openings at both ends, the modular pole assembly inside the film lacks proper fixation. This can lead to relative displacement between adjacent components, resulting in poor fixation of the modular pole assembly within the housing. Furthermore, this poses a risk of insulating film failure and reduces the reliability of the cell. Summary of the Invention

[0004] The purpose of this invention is to provide an insulating protection component and a battery cell. The insulating protection component can fix the two components of the combined pole group to prevent them from shifting or separating. The combined pole group is well fixed in the housing. At the same time, the insulating protection component also insulates and isolates the combined pole group from the housing, resulting in high reliability and safety.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] On one hand, the present invention provides an insulating protection assembly for fixing a combined electrode assembly, the combined electrode assembly comprising an electrode assembly body and electrode component parts, wherein one end of the electrode assembly body along a first direction is detachably connected to one end of the electrode component parts along the first direction, and the insulating protection assembly comprises:

[0007] An insulating film, comprising a cylindrical portion and a sealing portion, wherein the sealing portion is connected to one end of the cylindrical portion along a first direction, and an opening is formed at one end of the cylindrical portion away from the sealing portion along the first direction, and the combined electrode assembly is inserted into the insulating film through the opening;

[0008] An end plate is connected to the end of the insulating film that has the opening, and the end plate presses the combined electrode assembly against the sealing part along a first direction.

[0009] Optionally, the insulating protection assembly further includes a connecting pin, a first mounting hole group is provided at one end of the cylindrical part near the end plate, a second mounting hole group is provided on the end plate, and the connecting pin passes through the first mounting hole group and the second mounting hole group.

[0010] Optionally, the cylindrical body includes a first sidewall disposed opposite to each other along a second direction and a second sidewall disposed opposite to each other along a third direction. The sealing part is connected to both the first sidewall and the second sidewall. The first mounting hole group is disposed on the first sidewall, and the second mounting hole group is disposed on the end face of the end plate adjacent to the first sidewall.

[0011] Each of the first sidewalls is provided with two first mounting hole groups at intervals along a third direction. The first mounting hole group includes a first through hole, a second through hole and a third through hole. The first through hole, the second through hole and the third through hole are arranged in a triangular array. The first through holes in the two first mounting hole groups are close to each other and face each other along a third direction. The second through hole is located on the edge side of the first through hole near the first sidewall.

[0012] Optionally, along a third direction, the distance between the centers of the two first through holes is W1, and the distance between the centers of the two third through holes is W2; W1 and W2 satisfy the following condition: 2mm≤W2-W1≤7mm;

[0013] The value range of W1 is: 8mm≤W1≤20mm;

[0014] The value range of W2 is: 15mm≤W2≤22mm.

[0015] Optionally, along the first direction, the distance between the wall of the second through hole on the side opposite to the third through hole and the edge of the first sidewall is L1; the thickness of the first sidewall along the second direction is T;

[0016] The following condition must be met between L1 and T: 0.48mm²≤L1×T≤3.2mm²;

[0017] The value range of L1 is: 1.6mm≤L1≤4.0mm;

[0018] The value of T is in the range of 0.3mm≤T≤0.8mm.

[0019] Optionally, along the first direction, the distance between the hole walls of the second through hole and the third through hole on the side closest to each other is L2, and the value range of L2 is: 1.0mm≤L2≤2.0mm.

[0020] Optionally, the end plate includes an end plate body and clamping portions disposed at both ends of the end plate body along a second direction. Two second mounting hole groups are provided at intervals on the third sidewalls of the two clamping portions that are opposite to each other. Each second mounting hole group includes a fourth through hole and a fifth through hole. The fourth through hole and the fifth through hole in the two second mounting hole groups are arranged in a V-shaped array. The fourth through holes in the two second mounting hole groups are close to each other and face each other along the third direction.

[0021] Optionally, after the connecting pin is interference-fitted with the second mounting hole group, the length of the connecting pin extending out of the second mounting hole group along the second direction is H, and the value range of H is: 0.5mm≤H≤0.7mm.

[0022] Optionally, the sealing portion includes a first covering surface and a second covering surface, wherein the first covering surface is used to cover the end face of the electrode component on the side opposite to the electrode body along a first direction, and the second covering surface is used to cover the mating connection portion in the electrode component.

[0023] On the other hand, the present invention provides a battery cell including the insulation protection component of any of the above-described solutions.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention provides an insulating protective assembly, including a detachably connected insulating film and an end plate. The insulating film includes a cylindrical portion and a sealing portion. The sealing portion is connected to one end of the cylindrical portion along a first direction, and an opening is formed at the end of the cylindrical portion away from the sealing portion along the first direction. A combined electrode assembly is inserted into the insulating film through the opening. The end plate is connected to the end of the insulating film with the opening, and presses the combined electrode assembly against the sealing portion along the first direction. The end plate and the insulating film form a relatively closed installation space. The combined insulating film and end plate work together to stably fix the combined electrode assembly, preventing displacement between the electrode assembly body and the electrode components. Moreover, both the insulating film and the end plate have good insulation properties, effectively isolating the combined electrode assembly from the outside environment.

[0026] This invention also provides a battery cell, including a housing, a shaped battery cell cover, a combined electrode assembly, and the aforementioned insulation and protection component. The insulation and protection component can separately fix the electrode assembly body and electrode assembly of the combined electrode assembly, ensuring good positioning and fixation between the two components of the combined electrode assembly. After the combined electrode assembly, insulation and protection component, housing, and shaped battery cell cover are assembled, the combined electrode assembly is well fixed within the housing, reducing the risk of displacement. Furthermore, the insulation and protection component provides insulation and isolation between the combined electrode assembly and the housing and shaped battery cell cover, resulting in high safety and reliability. In addition, due to the use of the shaped battery cell cover, this battery cell is easy to group with other battery cells, facilitating arrangement, saving assembly space, and achieving a high module grouping rate. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the insulation protection component provided in Embodiment 1 of the present invention;

[0028] Figure 2 for Figure 1 A magnified view of a section at point I;

[0029] Figure 3 for Figure 1 Enlarged view of a section at point II;

[0030] Figure 4 This is a cross-sectional view of the combined pole group and insulation protection component provided in Embodiment 1 of the present invention after assembly;

[0031] Figure 5 for Figure 4 Enlarged view of a section at point III;

[0032] Figure 6 for Figure 4 Enlarged view of a section at point IV;

[0033] Figure 7 This is a front view of the combined pole group provided in Embodiment 1 of the present invention;

[0034] Figure 8 This is a partial enlarged view of the insulating film provided in Embodiment 1 of the present invention;

[0035] Figure 9 This is an exploded view of the end plate and connecting pin provided in Embodiment 1 of the present invention;

[0036] Figure 10 This is a front view of the end plate and connecting pin after assembly, as provided in Embodiment 1 of the present invention;

[0037] Figure 11 This is a right view of the end plate provided in Embodiment 1 of the present invention;

[0038] Figure 12 This is a schematic diagram of the irregularly shaped battery cell cover plate provided in Embodiment 1 of the present invention;

[0039] Figure 13 This is a schematic diagram of the battery cell provided in Embodiment 1 of the present invention.

[0040] Figure 14 This is a cross-sectional view of the battery cell provided in Embodiment 1 of the present invention;

[0041] Figure 15 yes Figure 14 A magnified view of section V;

[0042] Figure 16 This is a schematic diagram of the insulation protection component provided in Embodiment 2 of the present invention;

[0043] Figure 17 for Figure 16 A magnified view of a section at point VI;

[0044] Figure 18 This is a schematic diagram of the battery cell provided in Embodiment 2 of the present invention.

[0045] Figure 19 This is a cross-sectional view of the battery cell provided in Embodiment 2 of the present invention;

[0046] Figure 20 for Figure 19 A magnified view of section VII;

[0047] Figure 21 for Figure 19 A magnified view of section VIII;

[0048] Figure 22 This is a schematic diagram of the irregularly shaped battery cell cover plate provided in Embodiment 2 of the present invention.

[0049] In the picture:

[0050] 100. Insulating film; 110. Cylinder body; 1101. Opening; 111. First sidewall; 112. Second sidewall; 113. First mounting hole group; 1131. First through hole; 1132. Second through hole; 1133. Third through hole; 120. Sealing part; 121. First covering surface; 122. Second covering surface; 1201. Perforation;

[0051] 200. End plate; 210. End plate body; 211. Clearance hole; 220. Clamping part; 221. Second mounting hole group; 2211. Fourth through hole; 2212. Fifth through hole; 222. Third side wall; 300. Connecting pin;

[0052] 400. Combined electrode assembly; 410. Electrode assembly body; 411. Insertion boss; 412. First flow guide connector; 413. Second flow guide connector; 420. Electrode assembly components; 421. Insertion groove; 422. Third flow guide connector; 423. Fourth flow guide connector; 424. Mating connection part; 425. Positioning boss; 430a. Negative electrode tab; 430b. Positive electrode tab;

[0053] 500. Irregularly shaped cell cover plate; 510. Cover plate body; 511. First panel; 512. Transition plate; 513. Second panel; 5131. Protrusion; 5132. Recess; 5133. Reinforcing rib; 520. First plastic part; 521. First receiving groove; 530. Connecting block; 540. Second plastic part; 5401. Second receiving groove; 541. Plastic part body; 5411. Limiting groove; 542. Support part; 5422. Second receiving space; 550. First electrode post; 551. Plate part; 552. Post part; 560. Conductive connecting piece; 561. First conductive plate; 562. Second conductive plate; 570. Insulating protective patch; 580. Sealing element;

[0054] 600, casing; 700, planar cell cover; 710, second electrode post. Detailed Implementation

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

[0056] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0059] Example 1

[0060] like Figures 1-6 As shown, this embodiment provides an insulating protective component, which can be used to fix the combined pole group 400 and simultaneously isolate the combined pole group 400 from the outside environment. Optionally, the combined pole group 400 includes a pole group body 410 and pole group components 420, with one end of the pole group body 410 along a first direction detachably connected to one end of the pole group component 420 along the first direction. The insulating protective component can fix the pole group body 410 and the pole group component 420, preventing misalignment or separation between the pole group body 410 and the pole group component 420, and ensuring that the combined pole group 400 is well fixed inside the battery cell. The aforementioned first direction is... Figure 1 The X-axis direction is shown in the figure.

[0061] Optionally, see Figure 7 The electrode assembly body 410 has a plug-in boss 411 at one end along the first direction, and the electrode assembly sub-assemblies 420 have a plug-in groove 421 at one end along the first direction. The plug-in boss 411 mates with the plug-in groove 421 along the first direction, enabling flexible assembly and disassembly between the electrode assembly body 410 and the electrode assembly sub-assemblies 420. Additionally, the electrode assembly body 410 has an insulated first current-guiding connector 412 and a second current-guiding connector 413. The first current-guiding connector 412 and the second current-guiding connector 413 are respectively located on both sides of the plug-in boss 411 along the second direction. The first current-guiding connector 412 connects to the positive electrode of the electrode assembly body 410, and the second current-guiding connector 413 connects to the negative electrode of the electrode assembly body 410. The aforementioned second direction is... Figure 7The Y-axis direction is shown in the diagram. The electrode assembly sub-assembly 420 is provided with an insulated third current-conducting connector 422 and a fourth current-conducting connector 423. The third current-conducting connector 422 and the fourth current-conducting connector 423 are respectively located on both sides of the insertion slot 421 along the second direction. The third current-conducting connector 422 connects to the positive electrode of the electrode assembly sub-assembly 420, and the fourth current-conducting connector 423 connects to the negative electrode of the electrode assembly sub-assembly 420. When the insertion boss 411 and the insertion slot 421 are inserted into each other along the first direction, the insertion boss 411 and the insertion slot 421 are completely matched and closely fitted together. The first current-conducting connector 412 and the third current-conducting connector 422 are opposite to each other along the first direction and are in contact with conductive communication. The second current-conducting connector 413 and the fourth current-conducting connector 423 are opposite to each other along the first direction and are in contact with conductive communication, thereby realizing the circuit connection between the electrode assembly body 410 and the electrode assembly sub-assembly 420. The electrode assembly body 410 and the electrode assembly sub-assembly 420 are electrically connected as a whole to supply power to the external circuit. The electrode assembly body 410 and electrode assembly components 420 are connected by contact, which can reduce the space occupied and help increase the volume of the combined electrode assembly 400 and improve its capacity.

[0062] Further, the first current-guiding connector 412 includes a first substrate and a first conductive coating. The first substrate is connected to the positive electrode of the electrode assembly body 410. After being led out from the positive electrode of the electrode assembly body 410, the first substrate is bent and attached to the end face of the electrode assembly body 410 facing the electrode assembly sub-section 420. The first conductive coating is applied to the end face of the first substrate facing the electrode assembly sub-section 420. The second current-guiding connector 413 includes a second substrate and a second conductive coating. The second substrate is connected to the negative electrode of the electrode assembly body 410. After being led out from the negative electrode of the electrode assembly body 410, the second substrate is bent and attached to the end face of the electrode assembly body 410 facing the electrode assembly sub-section 420. The second conductive coating is applied to the end face of the second substrate facing the electrode assembly sub-section 420. The third current-conducting connector 422 includes a third substrate and a third conductive coating. The third substrate is connected to the positive electrode of the electrode assembly 420. After being led out from the positive electrode of the electrode assembly 420, the third substrate is bent and attached to the end face of the electrode assembly 420 facing the electrode assembly body 410. The third conductive coating is applied to the end face of the third substrate facing the electrode assembly body 410. The fourth current-conducting connector 423 includes a fourth substrate and a fourth conductive coating. The fourth substrate is connected to the negative electrode of the electrode assembly 420. After being led out from the negative electrode of the electrode assembly 420, the fourth substrate is bent and attached to the end face of the electrode assembly 420 facing the electrode assembly body 410. The fourth conductive coating is applied to the end face of the fourth substrate facing the electrode assembly body 410. In other words, the first substrate and the third substrate are the same polarity tabs, and the first conductive coating and the third conductive coating are in contact electrical connection; the second substrate and the fourth substrate are the same polarity tabs, and the second conductive coating and the fourth conductive coating are in contact electrical connection. The first conductive coating, the second conductive coating, the third conductive coating, and the fourth conductive coating are at least one of carbon-based materials, metallic materials, and conductive polymers, and have superior conductivity, adhesion, and safety performance.

[0063] See also Figure 1 and Figure 4The insulating protective assembly includes a detachably connected insulating film 100 and an end plate 200. The insulating film 100 and the end plate 200 are combined to fix the combined electrode assembly 400. Optionally, the sealing portion 120 of the insulating film 100 is connected to one end of the cylindrical portion 110 along a first direction. The end of the cylindrical portion 110 away from the sealing portion 120 along the first direction forms an opening 1101. The combined electrode assembly 400 is inserted into the insulating film 100 through the opening 1101. The end plate 200 is connected to the end of the insulating film 100 with the opening 1101. The end plate 200 presses the combined electrode assembly 400 against the sealing portion 120 along the first direction. The end plate 200 and the insulating film 100 form a relatively closed installation space, and the combined electrode assembly 400 is disposed within the installation space. Optionally, the insulating film 100 is a flexible insulating material, such as polyimide (PI), polyester (PET), polypropylene (PP), etc. The end plate 200 is a rigid insulating material, such as modified polypropylene (modified PP), PC (polycarbonate), polyphenylene sulfide (PPS), etc. Both the insulating film 100 and the end plate 200 have good insulation properties, thereby achieving insulation isolation between the combined electrode assembly 400 and the outside world. At the same time, the insulating film 100 and the end plate 200 can also fix the combined electrode assembly 400. The combined electrode assembly 400 is subjected to balanced forces on both sides along the first direction, and is fixed stably.

[0064] See also Figures 1-2 ,as well as Figure 4 and Figure 5 In this embodiment, the insulating protection component also includes a connecting pin 300. A first mounting hole group 113 is provided at one end of the cylindrical body 110 near the end plate 200, and a second mounting hole group 221 is provided on the end plate 200. The connecting pin 300 corresponds one-to-one with the first mounting hole group 113 and the second mounting hole group 221. After passing through the first mounting hole group 113, the connecting pin 300 is press-fitted with the second mounting hole group 221, thereby achieving a detachable connection between the insulating film 100 and the end plate 200. Simultaneously, the insulating film 100 is stretched along the first direction, which can stably fix the combined electrode group 400, preventing misalignment or separation between the electrode group body 410 and the electrode group components 420 of the combined electrode group 400. In some embodiments, the connecting pin 300 can be made of the same material as the end plate 200.

[0065] Optionally, the cylindrical portion 110 includes first sidewalls 111 disposed opposite each other along a second direction, and second sidewalls 112 disposed opposite each other along a third direction. The first sidewalls 111 and the second sidewalls 112 are adjacent to and connected to each other, and the cylindrical portion 110 of the insulating film 100 is formed by the two first sidewalls 111 and the two second sidewalls 112. The aforementioned second direction is... Figure 1 The Y-axis direction shown is the third direction. Figure 1The Z-axis direction is shown in the diagram. The sealing part 120 is connected to one end of the first sidewall 111 and the second sidewall 112 along the first direction. The first mounting hole group 113 is provided on the two first sidewalls 111, and the second mounting hole group 221 is provided on the end face of the end plate 200 adjacent to the first sidewall 111. Each first sidewall 111 has two first mounting hole groups 113 spaced apart along a third direction. Each first mounting hole group 113 includes a first through hole 1131, a second through hole 1132, and a third through hole 1133, arranged in a triangular array. The two first mounting hole groups 113 are symmetrically arranged along the centerline of the length direction (first direction) of the first sidewall 111. The first through holes 1131 in the two first mounting hole groups 113 are close to each other and face each other along the third direction. The second through hole 1132 is located on the edge of the first through hole 1131 near the first sidewall 111. By arranging the first through hole 1131, the second through hole 1132, and the third through hole 1133 of the first mounting hole group 113 in a triangular array, the connecting pin 300 can selectively mate with one of the first through hole 1131, the second through hole 1132, and the third through hole 1133 according to the actual size of the combined pole group 400. This results in better fit, adaptability, and fixing effect between the insulating film 100 and the combined pole group 400. Otherwise, if the first mounting hole group 113 only includes one first through hole 1131, and there is a dimensional deviation in the processing of the combined pole group 400, the insulating film 100 may not be tightened, and the connecting pin 300 may easily detach from the first mounting hole group 113 on the insulating film 100, reducing the reliability of the fixing. Alternatively, the insulating film 100 may be stretched too tightly, and the sealing part 120 of the insulating film 100 may squeeze the combined pole group 400, causing damage to the combined pole group 400.

[0066] See Figure 8 The diameters of the first through hole 1131, the second through hole 1132, and the third through hole 1133 are equal, and the diameter of the first through hole 1131, the second through hole 1132, and the third through hole 1133 is A, where the value of A is 1.0mm ≤ A ≤ 1.5mm. For example, the value of A can be 1.0mm, 1.2mm, or 1.5mm, etc.

[0067] Along the third direction, the distance between the centers of the two first through holes 1131 is W1, and the distance between the centers of the two third through holes 1133 is W2. W1 and W2 satisfy the condition: 2mm ≤ W2 - W1 ≤ 7mm. For example, the value of W2 - W1 can be 2mm, 4mm, 6mm, or 7mm, etc. By limiting the value of W2 - W1 to the above range, on the one hand, a larger space is provided between the two first through holes 1131 and between the two third through holes 1133, preventing excessive strength reduction in the insulating film 100 after opening, which could easily lead to deformation and damage, thus reducing the reliability of the fixed combined pole group 400; on the other hand, it also ensures that the fixing position of the connecting pin 300 is as close as possible to both ends of the first sidewall 111 along the third direction, thereby ensuring the fixed balance of the insulating film 100. For example, the value range of W1 is: 8mm ≤ W1 ≤ 20mm, and the value range of W2 is: 15mm ≤ W2 ≤ 22mm. For example, when the value of W1 is 8mm, the value of W2 can be 15mm; when the value of W1 is 15mm, the value of W2 can be 17mm, 20mm or 22mm, etc.; when the value of W1 is 20mm, the value of W2 can be 22mm.

[0068] Furthermore, the thickness of the first sidewall 111 along the second direction is T, and the value of T ranges from 0.3mm to 0.8mm. For example, the value of T can be 0.3mm, 0.5mm, 0.7mm, or 0.8mm, etc. By limiting the value of T to the above range, it can be ensured that the first sidewall 111 of the insulating film 100 has high strength and can withstand a certain tensile force without cracking or deformation. Along the first direction, the distance between the wall of the second through hole 1132 on the side opposite to the third through hole 1133 and the edge of the first sidewall 111 is L1, and the value of L1 ranges from 1.6mm to 4.0mm. For example, L1 can be 1.6mm, 2.0mm, 3.0mm, or 4.0mm, etc. By limiting the value of L1 within the above range, a certain space can be ensured between the second through hole 1132 and the edge of the first sidewall 111, avoiding the second through hole 1132 being too close to the edge of the first sidewall 111 along the first direction, which would reduce the strength of the first sidewall 111 of the insulating film 100, making it prone to cracking and deformation when pulled by the connecting pin 300, thus reducing reliability.

[0069] The relationship between L1 and T satisfies: 0.48mm² ≤ L1×T ≤ 3.2mm². The value of L1×T is the cross-sectional area of ​​the first sidewall 111 in the YZ plane (the plane perpendicular to the first direction). For example, the value of L1×T can be 0.48mm², 1.00mm², or 1.50mm². 2The values ​​of L1×T are 2.00 mm², 2.50 mm², 3.00 mm², or 3.20 mm², etc. By limiting the value of L1×T to the above range, the strength of the first sidewall 111 after the first mounting hole group 113 is opened is ensured to remain high, avoiding excessive strength drop in the insulating film 100 after the hole is opened, which could easily lead to deformation, damage, and other problems, thereby reducing the reliability of the fixed combined pole group 400.

[0070] Along the first direction, the distance between the adjacent walls of the second through hole 1132 and the third through hole 1133 is L2, and the value of L2 ranges from 1.0mm to 2.0mm. For example, the value of L2 can be 1.0mm, 1.2mm, 1.5mm, 1.8mm, or 2.0mm. By limiting the value of L2 to the above range, a certain space is maintained between the second through hole 1132 and the third through hole 1133, preventing the second through hole 1132 and the third through hole 1133 from being too close together, which would reduce the strength of the first sidewall 111 of the insulating film 100, making it prone to cracking and deformation when pulled by the connecting pin 300, thus reducing reliability.

[0071] See Figures 9-11 In this embodiment, the end plate 200 includes an end plate body 210 and clamping portions 220 disposed at both ends of the end plate body 210 along a second direction. Two second mounting hole groups 221 are provided at intervals on the third sidewalls 222 of the two clamping portions 220 that are opposite to each other. The two second mounting hole groups 221 are symmetrically arranged along the centerline of the width direction (third direction) of the third sidewall 222. Each second mounting hole group 221 includes a fourth through hole 2211 and a fifth through hole 2212. The fourth through hole 2211 and the fifth through hole 2212 in the two second mounting hole groups 221 are arranged in a V-shaped array. The fourth through holes 2211 in the two second mounting hole groups 221 are close to each other and face each other along the third direction. The fifth through hole 2212 is located on the side of the fourth through hole 2211 that is away from the centerline of the width direction of the third sidewall 222. By arranging the fourth through hole 2211 and the fifth through hole 2212 of the two second mounting hole groups 221 in a V-shaped array, the connecting pin 300 can selectively mate with one of the fourth through hole 2211 or the fifth through hole 2212 according to the actual size of the combined pole group 400, so that the insulating film 100 fits better with the combined pole group 400, has better adaptability, and better fixing effect. Otherwise, if the second mounting hole group 221 only includes one fourth through hole 2211, if there is a dimensional deviation in the processing of the combined pole group 400, the insulating film 100 may not be tightened, and the connecting pin 300 may easily come off the first mounting hole group 113 on the insulating film 100, reducing the reliability of fixing; or the insulating film 100 may be tightened too much, and the sealing part 120 of the insulating film 100 will squeeze the combined pole group 400, causing damage to the combined pole group 400.

[0072] Furthermore, after the connecting pin 300 is interference-fitted with the second mounting hole group 221, the length of the connecting pin 300 extending out of the second mounting hole group 221 along the second direction is H, and the value of H is in the range of 0.5mm≤H≤0.7mm. For example, the value of H can be 0.5mm, 0.6mm, or 0.7mm, etc. By limiting the value of H to the above range, it can be ensured that the part of the connecting pin 300 extending out of the second mounting hole group 221 can be well matched with the first mounting hole group 113 on the first sidewall 111 of the insulating film 100, preventing the connecting pin 300 from coming out of the first mounting hole group 113, and achieving a better fixing effect. Otherwise, if the value of H is too small, the engagement length between the connecting pin 300 and the first mounting hole group 113 on the first side wall 111 will be short, making it easy for the pin to come out of the first mounting hole group 113. Of course, the value of H should not be too large either, otherwise the length of the connecting pin 300 extending out of the first mounting hole group 113 will be too long, and when the combined pole group 400 is inserted into the casing, it will easily interfere with the casing 600 of the battery cell, causing damage to the casing 600.

[0073] The following uses samples from specific implementation cases to verify the relevant dimensional design of the above-mentioned insulation and protection components. See Table 1 for details.

[0074] Table 1

[0075]

[0076] As can be seen from the above results, the range of values ​​for parameters L1, L2, A, H, W1, W2, T, W2-W1, and L1×T in Examples 1 to 6 meets their corresponding size limitations. After the combined pole group 400 is assembled with the insulation protection component, there are no abnormalities in the circuit connection between the pole group body 410 and the pole group components 420. The first current guide connector 412 and the third current guide connector 422 have good contact, and the second current guide connector 413 and the fourth current guide connector 423 have good contact. Furthermore, the positioning between the pole group body 410 and the pole group components 420 is accurate, the fixing effect is good, and it is not easy to shake or shift. There is no damage during the assembly of the combined pole group 400 and the insulation protection component, the assembly yield is high, and the product is good.

[0077] In Example 7, the value of parameter L1×T is less than the minimum value of 0.48mm²≤L1×T≤3.2mm². At this time, the first mounting hole group 113 is too close to the edge of the first sidewall 111 along the first direction, and the cross-sectional area of ​​the first sidewall 111 in the YZ plane of the insulating film 100 is small. After the first mounting hole group 113 is opened, the strength of the insulating film 100 decreases too much. When the insulating film 100 is assembled with the end plate 200 and the connecting pin 300, the insulating film 100 is prone to deformation and cracking at the position where the first mounting hole group 113 is opened. The fixing strength of the combined pole group 400 is insufficient, and there is a possibility of displacement of the pole group body 410 or the pole group component 420, which leads to damage and deformation of the combined pole group 400, reduces the reliability of the positioning and fixing of the combined pole group 400, and results in product defects.

[0078] In Example 8, the value of parameter L1×T is greater than the maximum value of 0.48mm²≤L1×T≤3.2mm². At this time, the first mounting hole group 113 is far from the edge of the first sidewall 111 along the first direction, and the mating connection position with the end plate 200 is close to the side of the combined pole group 400. The connecting pin 300 is prone to interference with the combined pole group 400, and the force on the end plate 200 is unbalanced, which is not conducive to fixing the combined pole group 400, reducing the assembly yield and causing product defects.

[0079] In Example 9, the value of parameter W2-W1 is less than the minimum value of 2mm ≤ W2-W1 ≤ 7mm. At this time, the distance between the two first mounting hole groups 113 on the first sidewall 111 of the insulating film 100 along the third direction is too close, and the spacing between the holes is insufficient. After the holes are opened, the strength of the insulating film 100 is severely reduced. The first sidewall 111 of the insulating film 100 is prone to deformation or cracking at the location where the first mounting hole group 113 is opened. There is a possibility of displacement of the electrode group body 410 or the electrode group component 420, which reduces the reliability of positioning and fixing of the combined electrode group 400 and results in product defects.

[0080] In Example 10, the value of parameter W2-W1 is greater than the maximum value of 2mm≤W2-W1≤7mm. At this time, the first through hole 1131 in the two first mounting hole groups 113 on the first sidewall 111 of the insulating film 100 is too close to the center of the width direction (i.e., the third direction) of the first sidewall 111. When the connecting pin 300 is engaged with the first through hole 1131, the two sides of the width direction of the first sidewall 111 of the insulating film 100 are prone to fixing imbalance. The fixing strength of the insulating protection component to the combined pole group 400 is insufficient, which can easily cause the combined pole group 400 to shift, reduce the reliability of fixing the combined pole group 400, and result in product defects.

[0081] In Example 11, the value of parameter L2 is greater than the maximum value of 1.0mm ≤ L2 ≤ 2.0mm. At this time, the distance between the second through hole 1132 and the third through hole 113 in each first mounting hole group 113 on the first sidewall 111 of the insulating film 100 is large. When the connecting pin 300 needs to adjust the assembly position with the insulating film 100, the adjustment distance is too large. Either the connecting pin 300 pulls the insulating film 100 too tightly, which can easily cause the combined electrode group 400 to be damaged, or the insulating film 100 is pulled too loosely, which can easily cause the connecting pin 300 to detach from the insulating film 100. The fixing effect is not good, and the assembly position of the connecting pin 300 and the insulating film 100 cannot effectively match the size of the combined electrode group 400 along the first direction. The assembly yield decreases and the product is defective.

[0082] In Example 12, the value of parameter L2 is less than the minimum value of 1.0mm ≤ L2 ≤ 2.0mm. At this time, the distance between the second through hole 1132 and the third through hole 113 in each first mounting hole group 113 on the first sidewall 111 of the insulating film 100 is too small, and the spacing between the holes is insufficient. After the holes are opened, the strength of the insulating film 100 is severely reduced. The first sidewall 111 of the insulating film 100 is prone to deformation or cracking at the location where the first mounting hole group 113 is opened. There is a possibility of displacement of the electrode group body 410 or the electrode group component 420, which reduces the reliability of the positioning and fixing of the combined electrode group 400 and results in product defects.

[0083] Taking all factors into consideration, when the size design of the insulation protection component meets the above size requirements, it can be ensured that after the combined pole group 400 and the insulation protection component are assembled, the two parts of the combined pole group 400 (pole group body 410 and pole group component 420) fit well, are accurately positioned and undamaged, and the insulation protection component has high strength and does not deform or break, ensuring that the two parts of the combined pole group 400 are well fixed and have high reliability.

[0084] See also Figure 4 , Figure 6 and Figure 7The electrode assembly sub-assembly 420 has a mating connection portion 424 at one end opposite to the insertion slot 421 along the first direction. The shape of the mating connection portion 424 is adapted to the shape of the irregularly shaped cell cover plate 500, thereby effectively utilizing the internal space of the cell and improving the cell capacity. In this embodiment, the mating connection portion 424 is a mating boss. The sealing portion 120 of the insulating film 100 includes a first covering surface 121 and a second covering surface 122. The first covering surface 121 is used to cover the end face of the electrode assembly sub-assembly 420 of the combined electrode assembly 400 on the side away from the electrode assembly body 410 along the first direction, and the second covering surface 122 is used to cover the mating connection portion 424 (i.e., the mating boss) in the electrode assembly sub-assembly 420. The second covering surface 122 has a U-shaped structure. The end of the cylindrical part 110 near the sealing part 120 extends and connects to the second covering surface 122. The second covering surface 122 and the extended part of the cylindrical part 110 can completely cover the mating boss of the electrode assembly component 420. Thus, the sealing part 120 and the cylindrical part 110 of the insulating film 100 can form a semi-closed structure with an opening 1101 on one side. When the insulating film 100 is assembled and connected with the end plate 200 and the connecting pin 300, the combined electrode assembly 400 can be insulated and isolated from the outside world. In addition, the first covering surface 121 of the sealing part 120 is also provided with a through hole 1201, which allows the electrode tab to pass through. In this embodiment, there are two first covering surfaces 121, which are located on both sides of the second covering surface 122 along the second direction, and each first covering surface 121 is provided with a through hole 1201.

[0085] See also Figure 12 and Figure 15In this embodiment, the irregularly shaped battery cell cover 500 includes a cover body 510, two first plastic parts 520, two connecting blocks 530, two second plastic parts 540, an insulating protective patch 570, and two first electrode posts 550. The cover body 510 is disposed on one side of the combined electrode group 400 along the first direction. A protrusion 5131 is provided at the middle position of the cover body 510 along the second direction. The protrusion 5131 protrudes in the direction away from the combined electrode group 400 along the first direction. The two ends of the cover body 510 along the second direction form recessed areas relative to the protrusion 5131. Two second plastic parts 540 are disposed on the side of the cover plate body 510 near the combined electrode assembly 400, and the two second plastic parts 540 are located at both ends of the cover plate body 510 along its length direction (i.e., the second direction). Two first plastic parts 520 are disposed on the side of the cover plate body 510 away from the combined electrode assembly 400, and the two first plastic parts 520 are located at both ends of the cover plate body 510 along its length direction (i.e., the second direction). The two first plastic parts 520, two connecting blocks 530, two second plastic parts 540, and two first electrode posts 550 correspond one-to-one and are respectively placed in the recessed areas on both sides of the protrusion 5131 on the cover plate body 510 along the second direction. One end of each first electrode post 550 passes through a second plastic part 540, the cover plate body 510, a first plastic part 520, and a connecting block 530, and is then riveted to the corresponding connecting block 530, thereby fixing the two first electrode posts 550 to both sides of the protrusion 5131 on the cover plate body 510 in the second direction. The first pole post 550 is insulated from the cover plate body 510 by the first plastic part 520 and the second plastic part 540.

[0086] Optionally, the two connecting blocks 530 are respectively located in the first receiving groove 521 on the side of the corresponding first plastic part 520 away from the cover plate body 510, and the plate part 551 of the first pole post 550 is located in the second receiving groove 5401 on the side of the second plastic part 540 away from the cover plate body 510. The first receiving groove 521 ensures the positioning accuracy between the first plastic part 520 and the connecting block 530; the second receiving groove 5401 ensures the positioning accuracy between the second plastic part 540 and the first pole post 550, thereby enabling the first pole post 550 and the connecting block 530 to be smoothly assembled with a high assembly yield.

[0087] It should be noted that the end face of the connecting block 530 facing away from the combined electrode assembly 400 is lower than the end face of the protrusion 5131 facing away from the combined electrode assembly 400, and the end of the first electrode post 550 riveted to the connecting block 530 is lower than the end face of the protrusion 5131 facing away from the combined electrode assembly 400. In other words, the ends of the first plastic part 520, the connecting block 530, and the first electrode post 550 riveted to the connecting block 530 are all recessed in the recessed areas at both ends of the cover plate body 510 along the second direction. This provides good protection for the first plastic part 520, the connecting block 530, and the first electrode post 550, mitigating the risk of collisions and ensuring high safety. In addition, after the irregularly shaped cell cover plate 500, the housing 600, and the combined electrode group 400 are assembled to form a cell, when the first electrode post 550 of the cell is welded to the conductive busbar to form a group (multiple cells are connected in series and parallel through the conductive busbar), the assembly space of the battery module can be saved, the module assembly rate can be increased, and the performance indicators of the battery module (including: size specifications, capacity, safety performance, etc.) can be improved.

[0088] Furthermore, the cover plate body 510 includes two first panels 511, two transition plates 512, and a second panel 513. The two transition plates 512 are located on both sides of the second panel 513 along the second direction. Each transition plate 512 connects to a first panel 511. There is a height difference between the first panel 511 and the second panel 513 along the first direction. The two transition plates 512 and the second panel 513 form a protrusion 5131, and a recessed area is formed at the first panel 511. The second plastic part 540 is disposed on the side of the first panel 511 facing the combined electrode assembly 400. An insulating protective patch 570 is affixed to the end face of the transition plate 512 and the second panel 513 facing the combined electrode assembly 400. The insulating protective patch 570 forms a first accommodating space on the side facing the combined electrode assembly 400. The opening of the first accommodating space faces the combined electrode assembly 400. The mating boss of the combined electrode assembly 400 extends into the first accommodating space and abuts against the insulating protective patch 570, thus insulating the combined electrode assembly 400 from the cover plate body 510. Furthermore, the mating boss's engagement with the first accommodating space increases the volume of the combined electrode assembly 400 while making efficient use of the internal space of the battery cell. This high space utilization rate is beneficial for increasing the battery cell's capacity and also improves the positioning accuracy between the combined electrode assembly 400 and the irregularly shaped battery cell cover plate 500. The combined electrode assembly 400 is better fixed within the battery cell, reducing the likelihood of movement.

[0089] Optionally, the transition plate 512 is tilted relative to the second panel 513 at an angle between 100° and 160°. This makes it easy for the mating bosses of the electrode assembly sub-assemblies 420 to mate with the insulating protective patches 570 on the cover body 510, making assembly easy and convenient. The cover body 510, adopting the above design, has high overall mechanical strength and structural stability. In some embodiments, the cover body 510 can be formed by flat plate stamping, ensuring high processing accuracy and high reliability and stability after assembly with other structural components of the irregularly shaped cell cover 500. Furthermore, multiple reinforcing ribs 5133 can be provided on the side of the second panel 513 facing away from the combined electrode assembly 400. These reinforcing ribs 5133 are spaced apart along a third direction, and both ends of each reinforcing rib 5133 extend to the transition plate 512 along a second direction. The reinforcing ribs 5133 further improve the mechanical strength of the cover body 510, preventing severe deformation after impact.

[0090] See also Figure 15 The first electrode post 550 includes a plate portion 551 and a column portion 552 connected to each other. At least a portion of the plate portion 551 is embedded in the second receiving groove 5401 of the second plastic part 540. One end of the column portion 552 passes through the second plastic part 540, the first panel 511 of the cover plate body 510, the first plastic part 520, and the connecting block 530 in sequence, and is then riveted to the connecting block 530. In this embodiment, the two second plastic parts 540 are arranged separately, which can reduce the positioning accuracy requirements when assembling the cover plate body 510 and the second plastic parts 540, and improve the assembly yield. The irregularly shaped cell cover plate 500 also includes a sealing member 580, which is sleeved on the column portion 552 of the first electrode post 550 and seals the gap between the column portion 552 of the first electrode post 550 and the cover plate body 510. The sealing element 580 ensures excellent sealing and insulation performance of the irregularly shaped battery cell cover 500, resulting in high safety and preventing electrolyte leakage.

[0091] Furthermore, in this embodiment, the supporting position of the combined electrode group 400 and the irregularly shaped cell cover plate 500 is located at the middle position of the combined electrode group 400 along the second direction, that is, at the mating point of the mating boss and the insulating protective patch 570. The combined electrode group 400 is supported and balanced on both sides along the second direction. When the irregularly shaped cell cover plate 500 pushes the combined electrode group 400 into the shell and fixes it, it is not easy to cause damage, fragments, excessive movement, or other defects.

[0092] This embodiment also provides a battery cell, see [link to example]. Figures 13-15The battery cell includes a housing 600, the aforementioned irregularly shaped cell cover 500, the aforementioned combined electrode assembly 400, and the aforementioned insulation protection component. The insulation protection component secures the electrode assembly body 410 and electrode assembly components 420 of the combined electrode assembly 400, ensuring proper positioning and fixation between the two parts of the combined electrode assembly 400. After assembly with the combined electrode assembly 400, the insulation protection component, the housing 600, and the irregularly shaped cell cover 500, the combined electrode assembly 400 is well-fixed within the housing 600, reducing the risk of displacement. Furthermore, the insulation protection component provides insulation and isolation between the combined electrode assembly 400 and the housing 600 and the irregularly shaped cell cover 500, ensuring high safety and reliability. Additionally, the use of the irregularly shaped cell cover 500 facilitates grouping this battery cell with other cells, simplifying layout, saving assembly space, and resulting in a high module grouping rate.

[0093] The battery cell in this embodiment can be a blade battery cell, including the aforementioned combined electrode assembly 400, insulation protection component, irregularly shaped battery cell cover plate 500, housing 600, and flat battery cell cover plate 700. The housing 600 has openings at both ends along the first direction, and the flat battery cell cover plate 700 and the irregularly shaped battery cell cover plate 500 are respectively disposed at one opening of the housing 600. The combined electrode assembly 400 is installed inside the housing 600, and positive electrode tabs 430b and negative electrode tabs 430a are respectively led out from both ends of the combined electrode assembly 400 along the first direction. The irregularly shaped battery cell cover plate 500 is the negative electrode cover plate, the flat battery cell cover plate 700 is the positive electrode cover plate, there are two negative electrode tabs 430a, and one positive electrode tab 430b. The positive electrode tab 430b passes through the clearance hole 211 on the end plate body 210 of the end plate 200 (see...). Figure 9 Afterwards, it is electrically connected to the second electrode post 710 on the planar cell cover plate 700. The two negative electrode tabs 430a pass through a perforation 1201 on the sealing portion 120 of the insulating film 100 and are correspondingly connected to a conductive connecting piece 560 on the irregularly shaped cell cover plate 500. Optionally, the conductive connecting piece 560 includes a first conductive plate 561 and a second conductive plate 562 connected to each other. The first conductive plate 561 and the second conductive plate 562 are L-shaped. The first conductive plate 561 is connected to the plate body portion 551 of the first electrode post 550 integrated on the irregularly shaped cell cover plate 500. The second conductive plate 562 is stacked and connected to the negative electrode tabs 430a along a third direction (the third direction is...). Figure 13 (The Z-axis direction is shown in the diagram).

[0094] Example 2

[0095] This embodiment provides an insulation protection component; see [link / reference] Figure 16 , Figure 17 and Figure 19 The difference between this and the insulation protection component in Embodiment 1 is that the sealing part 120 of the insulation film 100 has a different structural design.

[0096] In this embodiment, the electrode assembly 400 has a mating connection portion 424 in the electrode assembly component 420, which is a mating groove. The mating groove is located along the second direction (…). Figure 16 Two positioning bosses 425 are formed on both sides of the insulating film 100 (in the Y-axis direction shown). The sealing portion 120 of the insulating film 100 includes a first covering surface 121 and a second covering surface 122. The cylindrical portion 110 extends from both ends along the second direction toward the sealing portion 120 and connects with the first covering surface 121. The extended portion of the cylindrical portion 110 is used to cover the sidewalls of the two positioning bosses 425. The first covering surface 121 is used to cover the end face of the electrode component 420 away from the electrode body 410 along the first direction (that is, the end face of the two positioning bosses 425 away from the electrode body 410 along the first direction). The second covering surface 122 is used to cover the mating connection portion 424 (that is, the mating groove) in the electrode component 420. The second covering surface 122 is also a U-shaped structure, and the mating groove of the electrode component 420 can be completely covered by the second covering surface 122. Therefore, the sealing portion 120 and the cylindrical portion 110 of the insulating film 100 can form a semi-closed structure with an opening 1101 on one side. When the insulating film 100 is assembled and connected with the end plate 200 and the connecting pin 300, it can insulate and isolate the combined electrode group 400 from the outside world. At the same time, the insulating protection component can still be used to fix the combined electrode group 400, ensuring that the combined electrode group 400 is well fixed inside the cell. The electrode group body 410 and the electrode group components 420 of the combined electrode group 400 are not prone to displacement, and the positioning and fixing effect is better. In addition, a through hole 1201 is provided on the second covering surface 122 of the sealing portion 120, through hole 1201, allowing the electrode tab to pass through. In this embodiment, there are two first covering surfaces 121, which are located on both sides of the second covering surface 122 along the second direction.

[0097] This embodiment also provides a battery cell, see [link to example]. Figures 18-22 The battery cell includes a housing 600, a shaped cell cover 500, the aforementioned combined electrode assembly 400, and the aforementioned insulation protection component. The insulation protection component secures the electrode assembly body 410 and electrode assembly parts 420 of the combined electrode assembly 400, ensuring proper positioning and fixation between the two components. After assembly with the housing 600 and the shaped cell cover 500, the combined electrode assembly 400 is well-fixed within the housing 600, minimizing the risk of displacement. Furthermore, the insulation protection component provides insulation between the combined electrode assembly 400 and the housing 600 and the shaped cell cover 500, ensuring high safety and reliability. Additionally, the use of the shaped cell cover 500 facilitates grouping this battery cell with other cells, simplifying layout, saving assembly space, and resulting in a high module grouping rate.

[0098] However, it should be noted that in order to adapt to the above-mentioned combined electrode group 400, the structural design of the irregularly shaped cell cover plate 500 in this embodiment is different from the structural design of the irregularly shaped cell cover plate 500 in Embodiment 1.

[0099] Specifically, the irregularly shaped battery cell cover 500 includes a cover body 510, a first plastic component 520, a connecting block 530, a second plastic component 540, and a first terminal post 550. The first plastic component 520 is disposed on the cover body 510 along a first direction ( Figure 18 On one side of the cover plate body 510 (shown in the X-axis direction), a recess 5132 is provided on the side where the first plastic part 520 is located. The first plastic part 520 is disposed in the recess 5132, and a connecting block 530 is disposed on the side of the first plastic part 520 away from the cover plate body 510. A second plastic part 540 is located on the end face of the cover plate body 510 opposite to the first plastic part 520 and is attached to the other end face of the cover plate body 510 along the first direction. One end of the first pole post 550 passes through the second plastic part 540, the cover plate body 510, the first plastic part 520, and the connecting block 530 and is riveted to the connecting block 530, thereby fixing the first pole post 550 on the cover plate body 510. The first plastic part 520 and the second plastic part 540 insulate the first pole post 550 from the cover plate body 510. The end face of the connecting block 530 facing away from the first plastic part 520 is located below the edge of the recess 5132, and the end of the first electrode post 550 riveted to the connecting block 530 is located below the end face of the connecting block 530 facing away from the first plastic part 520. The arrangement of the recess 5132 on the cover plate body 510 provides good protection for the first electrode post 550, mitigating the risk of impact and ensuring high safety. Simultaneously, the two ends of the second plastic part 540 along the second direction are respectively engaged with a positioning boss 425 of the combined electrode assembly 400 for press fitting, which can evenly apply pressure to the combined electrode assembly 400, preventing damage to the combined electrode assembly 400 when the irregularly shaped cell cover plate 500 is pressed into the casing, resulting in a high assembly yield.

[0100] As an optional embodiment, the cover body 510 includes two first panels 511, two transition plates 512, and one second panel 513. The two transition plates 512 are located on opposite sides of the second panel 513 along its length (i.e., the second direction), and each transition plate 512 connects to one first panel 511. Along the first direction, there is a height difference between the first panels 511 and the second panel 513, and the two transition plates 512 and the second panel 513 form the aforementioned recess 5132. The first plastic part 520 is fitted to the end face of the second panel 513 facing away from the second plastic part 540, and the connecting block 530 is at least partially accommodated within the first receiving groove 521 of the first plastic part 520, achieving precise positioning between the connecting block 530 and the first plastic part 520. After the connecting block 530 and the first plastic part 520 are disposed in the recess 5132, the end face of the connecting block 530 facing away from the second plastic part 540 is lower than the end face of the first panel 511 facing away from the second plastic part 540, thereby effectively protecting the connecting block 530 and the first terminal 550 from damage during the manufacturing process of the irregularly shaped cell cover 500. Simultaneously, when the cells are assembled, the end face of the connecting block 530 facing away from the second plastic part 540 is lower than the end face of the first panel 511 facing away from the second plastic part 540, which also allows the conductive busbar connecting two adjacent cells to be housed in the recess 5132. The end face of the conductive busbar facing away from the second plastic part 540 is also lower than the end face of the first panel 511 facing away from the second plastic part 540, saving assembly space and improving the assembly rate of the battery module. It should be noted that the battery module is formed by multiple cells connected in series and parallel via conductive busbars. For example, the height difference between the first panel 511 and the second panel 513 can be formed by mechanical bending. And in order to make the transition between the first panel 511 and the second panel 513 smoother and more gradual, the transition plate 512 can be arranged at an angle relative to the second panel 513.

[0101] See also Figures 18-22 The second plastic part 540 includes a plastic part body 541 and two support portions 542. The support portions 542 are connected to the plastic part body 541 along its length direction (i.e., the second direction). Figure 18 At the end of the second plastic part 540 (in the Y-axis direction shown), the two positioning bosses 425 of the combined electrode assembly 400 can be supported by the support part 542. Thus, the two support parts 542 of the second plastic part 540 can apply pressure evenly to the two positioning bosses 425 of the combined electrode assembly 400 along the first direction, ensuring that the combined electrode assembly 400 is subjected to balanced force when inserted into the casing, reducing the risk of fragmentation or damage, improving assembly yield, and enhancing the safety and reliability of the battery cell. Optionally, the support part 542 has a shell-like structure with a hollow interior forming a second accommodating space 5422, the opening of which faces the combined electrode assembly 400. By setting the support part 542 to a shell-like structure, the manufacturing cost of the second plastic part 540 is reduced, and a certain weight reduction effect is achieved.

[0102] Further, the first electrode post 550 includes a plate portion 551 and a column portion 552 connected to each other. The column portion 552 is sequentially inserted through the plastic body 541 of the second plastic part 540, the second panel 513 of the cover plate body 510, the first plastic part 520, and the connecting block 530, and then riveted to the connecting block 530. The plate portion 551 is located on the side of the second plastic part 540 away from the cover plate body 510. By adopting the above method, the first electrode post 550 is fixed on the cover plate body 510. The irregularly shaped battery cell cover plate 500 also includes a conductive connecting piece 560. The electrode group 420 of the combined electrode group 400 is provided with a negative electrode tab 430a on the side facing the irregularly shaped battery cell cover plate 500. The first conductive plate 561 of the conductive connecting piece 560 is electrically connected to the plate portion 551 of the first electrode post 550, and the second conductive plate 562 of the conductive connecting piece 560 is connected to the negative electrode tab 430a along a third direction ( Figure 18 The conductive connecting piece 560 (shown in the Z-axis direction) is stacked and electrically connected to the negative electrode tab 430a. Optionally, in this embodiment, the conductive connecting piece 560 is bent into an L-shape, and the second conductive plate 562 of the conductive connecting piece 560 extends in the direction of the combined electrode group 400, which helps to shorten the length of the electrode tab and reduce the risk of electrode tab tearing and poor bending. For example, the conductive connecting piece 560 can be made of copper.

[0103] Optionally, in some embodiments, the second plastic part 540 is further provided with a limiting groove 5411 on its body 541. The limiting groove 5411 is located on the end face of the plastic part 541 facing the electrode assembly, and the plate portion 551 of the first electrode post 550 is embedded in the limiting groove 5411. Through the cooperation between the plate portion 551 and the limiting groove 5411, precise positioning between the second plastic part 540 and the first electrode post 550 is achieved, resulting in high assembly accuracy. At the same time, the setting of the limiting groove 5411 also reduces the thickness of the irregularly shaped cell cover 500 along the first direction, which is beneficial to the lightweight design of the irregularly shaped cell cover 500 and saves space.

[0104] The irregularly shaped cell cover 500 also includes a sealing element 580, which is sleeved on the outer side of the cylindrical portion 552 of the first electrode post 550, sealing the gap between the cylindrical portion 552 of the first electrode post 550 and the cover body 510. The sealing element 580 ensures excellent sealing and insulation performance of the irregularly shaped cell cover 500, resulting in high safety and preventing electrolyte leakage.

[0105] Optionally, the battery cell in this embodiment is also a blade battery cell, including the aforementioned combined electrode assembly 400, insulation protection component, irregularly shaped battery cell cover plate 500, housing 600, and flat battery cell cover plate 700. The housing 600 has openings at both ends along the first direction, and the flat battery cell cover plate 700 and the irregularly shaped battery cell cover plate 500 are respectively disposed at one opening of the housing 600. The combined electrode assembly 400 is installed inside the housing 600, and a positive electrode tab 430b and a negative electrode tab 430a are respectively led out from both ends of the combined electrode assembly 400 along the first direction. The irregularly shaped battery cell cover plate 500 is the negative electrode cover plate, and the flat battery cell cover plate 700 is the positive electrode cover plate. There is one negative electrode tab 430a and one positive electrode tab 430b. The positive electrode tab 430b passes through the clearance hole 211 on the end plate body 210 of the end plate 200 and is electrically connected to the second electrode post 710 on the flat battery cell cover plate 700. The negative electrode tab 430a passes through the perforation 1201 on the sealing part 120 of the insulating film 100 and is connected to the conductive connecting piece 560 on the irregularly shaped battery cell cover plate 500.

[0106] The remaining structures in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0107] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An insulating protective assembly for fixing a modular electrode assembly, the modular electrode assembly comprising an electrode assembly body and electrode component parts, wherein one end of the electrode assembly body along a first direction is detachably connected to one end of each electrode component part along a first direction, characterized in that, The insulation protection component includes: An insulating film, comprising a cylindrical portion and a sealing portion, wherein the sealing portion is connected to one end of the cylindrical portion along a first direction, and an opening is formed at one end of the cylindrical portion away from the sealing portion along the first direction, and the combined electrode assembly is inserted into the insulating film through the opening; An end plate is connected to the end of the insulating film that has the opening, and the end plate presses the combined electrode assembly against the sealing part along a first direction; The insulating protective assembly also includes a connecting pin. The cylindrical part is provided with a first mounting hole group at one end near the end plate, and the end plate is provided with a second mounting hole group. The connecting pin passes through the first mounting hole group and the second mounting hole group. After passing through the first mounting hole group, the connecting pin is press-fitted with the second mounting hole group so that the insulating film is stretched along the first direction. The cylindrical part includes a first sidewall disposed opposite to each other along a second direction and a second sidewall disposed opposite to each other along a third direction. The sealing part is connected to both the first sidewall and the second sidewall. The first mounting hole group is disposed on the first sidewall, and the second mounting hole group is disposed on the end face of the end plate adjacent to the first sidewall. Each of the first sidewalls has two sets of first mounting holes spaced apart along a third direction. Each set of first mounting holes includes a first through hole, a second through hole, and a third through hole. The first through hole, the second through hole, and the third through hole are arranged in a triangular array, so that the connecting pin can selectively engage with one of the first through hole, the second through hole, and the third through hole according to the actual size of the combined pole group. The first through holes in the two sets of first mounting holes are close to each other and face each other along a third direction. The second through hole is located on the edge of the first through hole near the first sidewall.

2. The insulating protective assembly according to claim 1, characterized in that, Along the third direction, the distance between the centers of the two first through holes is W1, and the distance between the centers of the two third through holes is W2; The following condition must be satisfied between W1 and W2: 2mm≤W2-W1≤7mm; The value range of W1 is: 8mm≤W1≤20mm; The value range of W2 is: 15mm≤W2≤22mm.

3. The insulating protective assembly according to claim 1, characterized in that, Along the first direction, the distance between the wall of the second through hole on the side opposite to the third through hole and the edge of the first sidewall is L1; the thickness of the first sidewall along the second direction is T; The following condition must be met between L1 and T: 0.48mm²≤L1×T≤3.2mm²; The value range of L1 is: 1.6mm≤L1≤4.0mm; The value of T is in the range of 0.3mm≤T≤0.8mm.

4. The insulating protective assembly according to claim 1, characterized in that, Along the first direction, the distance between the walls of the second through hole and the third through hole on the side closest to each other is L2; The value range of L2 is: 1.0mm≤L2≤2.0mm.

5. The insulating protective assembly according to claim 1, characterized in that, The end plate includes an end plate body and clamping portions disposed at both ends of the end plate body along a second direction. Two second mounting hole groups are provided at intervals on the third sidewalls of the two clamping portions that are opposite to each other. Each second mounting hole group includes a fourth through hole and a fifth through hole. The fourth through hole and the fifth through hole in the two second mounting hole groups are arranged in a V-shaped array. The fourth through holes in the two second mounting hole groups are close to each other and face each other along the third direction.

6. The insulating protective assembly according to claim 1, characterized in that, After the connecting pin is interference-fitted with the second mounting hole group, the connecting pin extends out of the second mounting hole group in the second direction by a length H. The value range of H is: 0.5mm≤H≤0.7mm.

7. The insulating protective assembly according to claim 1, characterized in that, The sealing portion includes a first covering surface and a second covering surface. The first covering surface is used to cover the end face of the electrode component on the side away from the electrode body along a first direction, and the second covering surface is used to cover the mating connection portion in the electrode component.

8. A battery cell, characterized in that, Includes the insulating protective component as described in any one of claims 1-7.

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