Battery assembly and electric equipment

Abstract

The battery assembly comprises a soft package battery and a PCB, the soft package battery comprises a packaging main body, a top sealing edge, a battery cell and a tab, the battery cell is located in the packaging main body, the packaging main body is provided with a first surface, the top sealing edge comprises an unsealed part and a sealed part, the unsealed part is connected to the first surface, the sealed part is connected to the unsealed part, and the tab is connected to the first surface. The sealing part is bent towards the packaging main body to form a sub-sealing part extending along the thickness direction of the soft package battery, one end of the tab is connected to the battery cell, and the other end of the tab penetrates out from the top sealing edge; the tab is electrically connected to the PCB, and at least part of the PCB is located between the sub-seal part and the first surface. According to the utility model, the sealing part is arranged in a bending manner, so that the risk that the internal PP layer cracks is reduced, the risk that the side voltage of the battery assembly is poor is reduced, and meanwhile, the PCB is partially arranged between the sub-sealing part and the first surface, so that the size of the battery assembly in the length direction of the soft package battery is reduced, and the energy density of the battery assembly is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially a kind of battery assembly and electric equipment. BACKGROUND

[0002] In order to obtain higher volume energy density, in some technologies, the top sealing edge is bent to the packaging body to make the top sealing edge fit the packaging body. However, due to the sealing process factors, there is a certain gap between the sealing part and the packaging body, i.e., there is an unsealed part between the sealing part and the packaging body. Since the aluminum plastic film between the unsealed part is not bonded, when the top sealing edge is bent near the packaging body, the PP layer inside the bending part is prone to crack, which may cause poor edge voltage. If the bending is performed at the sealing part, there is a gap between the bending part and the packaging body, which may reduce the energy density of the battery assembly. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery assembly, which can reduce the risk of poor edge voltage and has high energy density.

[0004] The utility model also provides an electric device comprising the above battery assembly.

[0005] According to the battery assembly of the first aspect of the utility model, the battery assembly comprises a soft-pack battery and a PCB board.

[0006] The soft-pack battery comprises a packaging body, a top sealing edge, a battery cell and a tab. The battery cell is located in the packaging body. The packaging body has a first surface. The top sealing edge comprises an unsealed part and a sealing part connected to each other. The unsealed part is connected to the first surface. The sealing part is connected to a side of the unsealed part away from the first surface. The sealing part is bent towards the packaging body to form a sub-sealing part spaced apart from the first surface. One end of the tab is connected to the battery cell, and the other end of the tab passes through the top sealing edge. The PCB board is located at one end of the soft-pack battery in the length direction. The PCB board has a second surface facing in the thickness direction of the PCB board. The second surface faces the first surface. At least part of the PCB board is located between the sub-sealing part and the first surface. The tab is electrically connected to the PCB board.

[0007] According to the battery assembly of the utility model, the following beneficial effects are achieved:

[0008] In the embodiment, the sealing part of the top sealing edge is bent to form a sub-sealing part spaced from the first surface, thereby reducing the risk of cracks in the internal PP layer and the risk of poor voltage of the battery assembly, and part of the PCB is arranged between the sub-sealing part and the first surface, thereby fully utilizing the space in the length direction of the soft package battery, reducing the size of the battery assembly in the length direction of the soft package battery, and improving the energy density of the battery assembly.

[0009] According to some embodiments of the present application, the PCB has a third surface in the width direction of the PCB, the PCB has a mounting slot, the mounting slot has a slot opening, the slot opening is located on the third surface, in the thickness direction of the PCB, the slot opening has a first edge close to the second surface, the sub-sealing part is inserted into the mounting slot from the slot opening, and the first edge abuts against the sealing part.

[0010] According to some embodiments of the present application, in the thickness direction of the PCB, the distance between the first edge and the second surface is a, and the width of the unsealed part is b, a>b.

[0011] According to some embodiments of the present application, the sub-sealing part comprises a first limiting part, the PCB comprises a second limiting part, the first limiting part abuts against the second limiting part, and the distance between the first edge and the first surface is not less than a.

[0012] According to some embodiments of the present application, the PCB further has a fourth surface arranged opposite to the third surface, and an end of the sub-sealing part away from the slot opening is located between the third surface and the fourth surface.

[0013] According to some embodiments of the present application, the mounting slot comprises a first hole section and a second hole section, the sub-sealing part is inserted into the first hole section, the tab is inserted into the second hole section, the thickness of the sub-sealing part is L1, in the thickness direction of the sub-sealing part, the size of the first hole section is L2, and 0≤L2-L1≤0.2mm.

[0014] According to some embodiments of the present application, the tab is electrically connected to the inner wall of the mounting slot.

[0015] According to some embodiments of the present application, the PCB comprises a first plate part and a second plate part arranged separately in the thickness direction of the PCB, and the first plate part is connected to the second plate part to jointly define the mounting slot.

[0016] According to some embodiments of the present application, the mounting slot is arranged obliquely relative to the third surface.

[0017] The power utilization device according to the second aspect of the present application comprises the battery assembly according to the first aspect of the present application.

[0018] The power utilization device according to the present application has at least the following beneficial effects:

[0019] The battery assembly according to the first aspect is provided with a sub-sealing part spaced apart from the first surface, which reduces the risk of cracks in the internal PP layer, thereby reducing the risk of poor edge voltage of the battery assembly.

[0020] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below in combination with the drawings and embodiments, wherein:

[0022] Figure 1 FIG. 1 is a structural schematic diagram of a battery assembly according to a first aspect of the present application;

[0023] Figure 2 FIG. 2 is a structural schematic diagram of a soft-packaged battery according to the first aspect of the present application; Figure 1

[0024] Figure 3 FIG. 3 is a structural schematic diagram of a PCB according to the first aspect of the present application; Figure 1

[0025] Figure 4 FIG. 4 is a sectional view of A-A according to the first aspect of the present application; Figure 1

[0026] Figure 5 FIG. 5 is a structural schematic diagram of another battery assembly according to the first aspect of the present application;

[0027] Figure 6 FIG. 6 is a structural schematic diagram of a PCB according to another battery assembly according to the first aspect of the present application;

[0028] Figure 7 FIG. 7 is a structural schematic diagram of a PCB according to another battery assembly according to the first aspect of the present application.

[0029] REFERENCE SIGNS:

[0030] ​​​Pouch battery 100, package body 110, first surface 111, top sealing edge 120, unsealed part 121, sealing part 122, first limiting part 123, sub-sealing part 1221, battery cell 130, tab 140;

[0031] PCB board 200, first plate part 201, second plate part 202, second surface 210, mounting groove 220, groove opening 221, first edge 2211, first hole section 222, second hole section 223, stepped surface 224, second limiting part 230, third surface 240, fourth surface 250. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0033] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0034] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of part of the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0035] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0036] To achieve higher volumetric energy density, some technologies bend the top seal edge towards the package body to make it fit the package body. However, due to sealing process factors, there is usually a certain gap between the sealed area and the package body, that is, there is an unsealed area between the sealed area and the package body. Since the aluminum-plastic film of the top seal edge is not bonded to the unsealed area, cracks are likely to appear in the internal PP layer at the bend when bending close to the package body, which can lead to poor edge voltage. If the bend is made at the sealed area, there will be a gap between the bend and the package body, resulting in a decrease in the energy density of the battery module.

[0037] Side voltage refers to the voltage of a single battery cell during charging and discharging. Specifically, it can be the voltage between the positive tab and the aluminum layer in the aluminum-plastic film, or the voltage between the negative tab and the aluminum layer in the aluminum-plastic film. In lithium-ion battery packs, side voltage is one of the important parameters for measuring battery state and performance. The presence of side voltage may indicate damage or poor encapsulation of the battery packaging film, which may lead to problems such as aluminum foil corrosion, electrolyte leakage, battery swelling, and low voltage. If the side voltage is too high, it may also cause an internal short circuit in the battery, creating a safety hazard.

[0038] In view of the above background, this utility model proposes a battery assembly that can reduce the risk of edge voltage defects while enabling the battery assembly to have a high energy density. Combined with... Figures 1 to 7 The embodiments of this utility model will be explained and described. It should be noted that in the drawings, the length direction is the length direction of the pouch battery, the width direction is the length direction of the top sealing edge, and the thickness direction is the thickness direction of the pouch battery. When the second surface 210 of the PCB board 200 is parallel to the first surface 111 of the pouch battery 100, the width direction of the PCB board 200 corresponds to the thickness direction of the pouch battery 100, the length direction of the PCB board 200 corresponds to the width direction of the pouch battery 100, and the thickness direction of the PCB board 200 corresponds to the length direction of the pouch battery 100.

[0039] Reference Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of the battery assembly according to the first aspect of the present invention. Figure 2 for Figure 1 A schematic diagram of the structure of a pouch cell battery. Figure 3 for Figure 1 A schematic diagram of the PCB board structure, in which... Figure 2 The dotted lines in the text should not be interpreted as the actual outline of the pouch battery, but are only used to more clearly show the specific locations of the unsealed portion 121 and the sealed portion 122. The battery assembly in this embodiment includes: a pouch battery 100 and a PCB board 200.

[0040] The pouch battery 100 includes a packaging body 110, a top sealing edge 120, a battery cell 130, and electrode tabs 140. The battery cell 130 is located within the packaging body 110, and the packaging body 110 has a first surface 111 (in the prior art, the first surface 111 in this embodiment is usually referred to as the top surface of the pouch battery 100). The top sealing edge 120 includes an unsealed portion 121 and a sealed portion 122 (e.g., ...) connected to each other. Figure 2 As shown), the unsealed portion 121 is connected to the first surface 111, and the sealed portion 122 is connected to the side of the unsealed portion 121 facing away from the first surface 111. The sealed portion 122 is bent toward the encapsulation body 110 to form a sub-sealed portion 1221 spaced apart from the first surface 111 (as shown). Figure 4 (As shown). One end of the tab 140 is connected to the cell 130, and the other end extends from the top sealing edge 120 and is electrically connected to the PCB board 200. The PCB board 200 is disposed at one end of the pouch battery 100 along its length direction. The PCB board 200 has a second surface 210 facing along its own thickness direction, and the second surface 210 faces the first surface 111. That is, the PCB board 200 is disposed on the top surface of the pouch battery 100 and is parallel to or nearly parallel to the top surface of the pouch battery 100. At least a portion of the PCB board 200 is located between the sub-sealing portion 1221 and the first surface 111.

[0041] For example, the PCB board 200 is entirely located between the sub-seal portion 1221 and the first surface 111, or as in the embodiments described below, the PCB board 200 has a mounting groove 220, and the sub-seal portion 1221 is inserted into the mounting groove 220, such that a portion of the PCB board 200 is located between the first surface 111 and the sub-seal portion 1221 (e.g., Figure 1 (As shown).

[0042] Specifically, in this embodiment, a sub-sealing portion 1221 is formed by bending the sealing portion 122 of the top sealing edge 120, which is spaced apart from the first surface 111. That is, the top sealing edge 120 is bent at the sealing portion 122, thereby reducing the risk of cracks in the internal PP layer and thus reducing the risk of poor edge voltage of the battery assembly. At the same time, at least a portion of the PCB board 200 is disposed between the sub-sealing portion 1221 and the first surface 111, so that the space occupied by the PCB board 200 and the top sealing edge 120 partially overlaps in the length direction of the pouch battery 100, making full use of the space in the length direction of the pouch battery 100, thereby reducing the size of the battery assembly in the length direction of the pouch battery 100 and improving the energy density of the battery assembly.

[0043] Reference Figure 1 , Figure 3 , Figure 4 and Figure 7 , Figure 4 for Figure 1 Sectional view of AA,Figure 7 Fig. 1 is a structural schematic diagram of a battery assembly according to an embodiment of the present application, Fig. 2 is a structural schematic diagram of a PCB board in the battery assembly according to an embodiment of the present application, Fig. 3 is a structural schematic diagram of another PCB board in the battery assembly according to an embodiment of the present application, Fig. 4 is a structural schematic diagram of a battery assembly according to another embodiment of the present application, and Fig. 5 is a structural schematic diagram of a battery assembly according to another embodiment of the present application. Figure 4 In some embodiments, the PCB board 200 has a third surface 240 in the width direction of the PCB board 200, the PCB board 200 has a mounting groove 220, the mounting groove 220 has a groove opening 221, the groove opening 221 is located on the third surface 240, and the mounting groove 220 extends along the width direction of the PCB board 200, i.e., the mounting groove 220 is arranged perpendicularly to the third surface 240 (as shown in Fig. 2) or is arranged obliquely to the third surface 240 (as shown in Fig. 3). Figure 4 In some embodiments, the PCB board 200 has a third surface 240 in the width direction of the PCB board 200, the PCB board 200 has a mounting groove 220, the mounting groove 220 has a groove opening 221, the groove opening 221 is located on the third surface 240, and the mounting groove 220 extends along the width direction of the PCB board 200, i.e., the mounting groove 220 is arranged perpendicularly to the third surface 240 (as shown in Fig. 2) or is arranged obliquely to the third surface 240 (as shown in Fig. 3). Figure 7 In some embodiments, the PCB board 200 has a third surface 240 in the width direction of the PCB board 200, the PCB board 200 has a mounting groove 220, the mounting groove 220 has a groove opening 221, the groove opening 221 is located on the third surface 240, and the mounting groove 220 extends along the width direction of the PCB board 200, i.e., the mounting groove 220 is arranged perpendicularly to the third surface 240 (as shown in Fig. 2) or is arranged obliquely to the third surface 240 (as shown in Fig. 3).

[0044] In some embodiments, the PCB board 200 has a third surface 240 in the width direction of the PCB board 200, the PCB board 200 has a mounting groove 220, the mounting groove 220 has a groove opening 221, the groove opening 221 is located on the third surface 240, and the mounting groove 220 extends along the width direction of the PCB board 200, i.e., the mounting groove 220 is arranged perpendicularly to the third surface 240 (as shown in Fig. 2) or is arranged obliquely to the third surface 240 (as shown in Fig. 3).

[0045] In addition, in the assembling process, the conventional technology needs to connect the top sealing edge 120 respectively with the packaging body 110 and the PCB 200, for example, by using glue to bond one surface of the top sealing edge 120 to the first surface 111 and to bond the PCB 200 to the other surface of the top sealing edge 120, so as to improve the strength of the battery assembly structure. In the present embodiment, since the top sealing edge 120 is inserted into the mounting groove 220, it is only needed to bond the PCB 200 to the first surface 111, which further improves the assembling efficiency of the battery assembly. Further, the battery assembly of the present embodiment only needs to set a layer of glue between the PCB 200 and the first surface 111, compared with the two layers of glue (the glue between the top sealing edge 120 and the first surface 111 and the glue between the top sealing edge 120 and the PCB 200) in the conventional technology, which has a smaller size in the length direction of the soft package battery 100, thereby improving the energy density of the battery assembly.

[0046] When the mounting groove 220 is arranged obliquely relative to the third surface 240, the mounting groove has a larger size in the case of the same width of the PCB, thereby being able to accommodate a wider sub-sealing part. In other words, under the premise of the same width of the sub-sealing part, the width of the PCB can be smaller, thereby avoiding the PCB protruding from the soft package battery in the thickness direction of the soft package battery, thereby improving the energy density of the battery assembly.

[0047] Referring to Figure 3 On the basis of the above embodiment, the size between the first edge 2211 and the second surface 210 in the thickness direction of the PCB 200 is a, and the width of the unsealed part 121 is b. The width of the unsealed part 121 is the size between the side of the unsealed part 121 away from the first surface 111 and the connection between the unsealed part 121 and the first surface 111, i.e. the size of the unsealed part 121 in the length direction of the soft package battery 100 when the unsealed part 121 extends in the length direction of the soft package battery 100, wherein a > b, i.e. when the top sealing edge 120 is inserted into the mounting groove 220, the crease of the top sealing edge 120 can be located in the sealing part 122, thereby making the assembling of the PCB 200 more simple and convenient.

[0048] Specifically, since the aluminum plastic film is an opaque structure, it is difficult to visually see the boundary between the sealing part 122 and the unsealed part 121 after the top sealing edge 120 of the soft package battery 100 is sealed. If manual assembly is used, only experienced workers can accurately determine the position of the sealing part 122, and the crease is arranged in the sealing part 122. Even experienced workers have the risk of crease position deviation, which leads to edge voltage failure. If automatic assembly is used, the position accuracy between the soft package battery 100 and the PCB board 200 needs to be high. Even if the boundary between the unsealed part 121 and the sealing part 122 can be seen, manual assembly requires workers to control the position of the crease, which affects the assembly efficiency.

[0049] In the embodiment, a is greater than b, and no matter how the bending is, the crease is located in the sealing part 122. Specifically, in the assembly process, the top sealing edge 120 is inserted into the mounting groove 220, and the PCB board 200 is rotated towards the first surface 111 with the first edge 2211 as the rotation axis, so that part of the PCB board 200 is located between the sub-sealing part 1221 and the first surface 111, and the crease is located at the first edge 2211. Since a is greater than b, the crease is located outside the unsealed part 121, that is, the crease is located in the sealing part 122. Therefore, in the embodiment, by a being greater than b, the crease can be ensured to be located in the sealing part 122, so that the bending of the top sealing edge 120 is simpler, and the assembly efficiency of the battery assembly of the embodiment is improved.

[0050] Referring to Figures 2 to 4In some embodiments, the sub-sealing part 1221 comprises a first limiting part 123, and the PCB 200 comprises a second limiting part 230, the first limiting part 123 abuts against the second limiting part 230, for limiting the size of the sub-sealing part 1221 extending into the mounting groove 220. Specifically, as in the above embodiments, a is greater than b, in the mounting process, no matter how to bend, it can be ensured that the crease is located in the sealing part, but in the specific operation process, the following situation may exist: when the top sealing edge 120 is inserted into the mounting groove 220, the size of the insertion is too large, and thus the distance between the edge of the mounting groove 220 and the first surface 111 is less than the distance between the second surface 210 and the slot 221, so that in the bending process, the edge of the PCB 200 collides with the first surface 111, and if the bending continues, it may cause the first surface 111 to have a crease, wrinkle or even damage, and if the size of the top sealing edge 120 inserted into the mounting groove 220 is adjusted, the assembly speed will be reduced. The present embodiment can effectively improve this problem. In the present embodiment, the PCB 200 comprises a first limiting part 123, and the PCB 200 comprises a second limiting part 230, for example, the mounting groove 220 comprises a first hole section 222 and a second hole section 223 which are in communication with each other, the cross sections of the first hole section 222 and the second hole section 223 are different, so that a stepped surface 224 facing the first hole section 222 is formed at the position where the first hole section 222 and the second hole section 223 are in communication, the stepped surface 224 serves as the second limiting part 230, the sub-sealing part 1221 is inserted into the first hole section 222, and the end of the sub-sealing part 1221 abuts against the stepped surface as the first limiting part 123, for limiting the size of the sub-sealing part 1221 extending into the mounting groove 220, so that the distance between the edge of the mounting groove 220 and the first surface 111 is not less than the distance between the second surface 210 and the slot 221, thereby avoiding the edge of the PCB 200 contacting the first surface 111 in the bending process. Thus, not only can the first surface 111 be prevented from being damaged, but also the assembly efficiency of the battery assembly can be ensured.

[0051] Referring to Figure 1 and Figure 3In some embodiments, the PCB 200 further has a fourth surface 250 opposite to the third surface 240, and the end of the sub-seal 1221 away from the slot 221 is located between the third surface 240 and the fourth surface 250. That is, the end of the top seal 120 is at least partially hidden in the PCB 200, improving the safety of the battery assembly. Specifically, taking the case where the mounting slot 220 is perpendicular to the third surface 240 as an example, if the length of the top seal 120 is equal to the length of the PCB 200, that is, in the width direction of the pouch battery 100, the size of the PCB 200 is equal to the size of the top seal 120, then the end of the top seal 120 is completely hidden inside the PCB 200. However, considering the energy density of the battery assembly, in some embodiments, the length of the PCB 200 is less than the length of the top seal 120, so the end of the top seal 120 is partially hidden inside the PCB 200. The top seal 120 is part of the shell formed by the aluminum plastic film, which includes an internal aluminum layer, so the aluminum layer of the top seal 120 will be exposed from the end. If the top seal 120 is completely exposed, it may cause the aluminum layer to contact other components and short circuit. The embodiment at least partially hides the end of the top seal 120 inside the PCB 200, which can effectively reduce the risk of short circuit of the battery assembly. Thus, the safety of the battery assembly is improved.

[0052] With reference to Figure 5 , Figure 5 is a structural schematic view of another battery assembly according to a first aspect of the present application. Based on the above embodiment, the tab 140 is electrically connected to the inner wall of the mounting slot 220. Specifically, the inner wall of the mounting slot 220 has a solder pad, and the tab 140 is welded to the solder pad, so that the tab 140 is located inside the PCB 200, which can avoid the tab 140 from contacting other components and causing short circuit, further improving safety. In addition, the tab 140 is connected to the inside of the PCB 200, without occupying the space on the outer surface of the PCB 200, so that the overall size of the PCB 200 can be made smaller, which not only improves the energy density of the battery assembly, but also reduces the weight of the battery assembly.

[0053] With reference to Figure 3In some embodiments, the mounting groove 220 includes a first hole section 222 and a second hole section 223, the sub-sealing part 1221 is inserted into the first hole section 222, and the tab 140 is inserted into the second hole section 223. The thickness of the sub-sealing part 1221 is L1, the size of the first hole section 222 in the thickness direction of the sub-sealing part 1221 is L2, and 0≤L2-L1≤0.2mm. Specifically, it can be understood that L2 is greater than L1, the sub-sealing part 1221 and the first hole section 222 are clearance fit, which can make the sub-sealing part 1221 more easily inserted into the first hole section 222, and the greater L2-L1, the more easily the sub-sealing part 1221 is inserted, and the heat dissipation performance of the sub-sealing part 1221 is improved. However, if L2-L1 is too large, it means that the hole on the PCB 200 is larger, which reduces the strength of the PCB 200. Therefore, the size of the first hole section 222 and the sub-sealing part 1221 is set in a suitable range, i.e. 0≤L2-L1≤0.2mm, which ensures the strength of the PCB 200 while improving the convenience of inserting the sub-sealing part 1221 and the heat dissipation performance.

[0054] Similarly, in some embodiments, the mounting groove 220 also includes a second hole section 223 in communication with the first hole section 222, and the tab 140 is arranged in the second hole section 223. The size of the tab 140 in the thickness direction of the sub-sealing part 1221 is L3, the size of the second hole section 223 is L4, and 0≤L4-L3≤0.2mm. Details are not repeated here.

[0055] It should be noted that the PCB 200 is provided with two second hole sections 223, and the tab 140 is arranged in the second hole section 223 one by one, which cannot be interpreted as the only limitation of the present embodiment. The second hole section 223 can also be provided as one, and two tabs 140 are inserted into the same second hole section 223. In some embodiments, the battery assembly includes a plurality of soft package batteries 100, for example, in a double-electrode 130 battery assembly, which includes four tabs 140. Therefore, the PCB 200 is provided with four second hole sections 223.

[0056] In some embodiments, the tab 140 is arranged in one-to-one correspondence with the second hole section 223, for example, the battery assembly is provided with only one soft package battery 100, the soft package battery 100 has two tabs 140, and the PCB board 200 has two second hole sections 223, so as to improve the strength of the PCB board 200. Specifically, if the PCB board 200 is provided with only one second hole section 223, the size of the second hole section 223 in the length direction of the PCB board 200 needs to be added to the spacing between the adjacent tabs 140, and in the present embodiment, the tab 140 is arranged in one-to-one correspondence with the second hole section 223, and the size of each second hole section 223 in the length direction of the PCB board 200 is not less than the width of the tab 140, that is, the PCB board 200 removes less material, so that the strength of the PCB board 200 is higher. On this basis, in the length direction of the PCB board 200, that is, in the width direction of the soft package battery 100, the size of the tab 140 is L5, and the size of the second hole section 223 is L6, 0≤L6-L5≤0.5mm, which improves the convenience of insertion of the tab 140 and the heat dissipation while ensuring the strength of the PCB board 200.

[0057] Referring to Figure 6 , Figure 6 The structure of the PCB board in another battery assembly according to the first aspect of the present application is shown in the figure. In some embodiments, the PCB board 200 includes a first plate part 201 and a second plate part 202 arranged separately along the thickness direction thereof, and the first plate part 201 is connected to the second plate part 202 to jointly define the mounting groove 220, so that the processing of the PCB board 200 is simpler. Specifically, the sub-sealing part 1221 is a sheet structure, and therefore the mounting groove 220 is a long and narrow hole. To simplify the processing of the mounting groove 220, the PCB board 200 is arranged as the first plate part 201 and the second plate part 202 in the present embodiment, and the mounting groove 220 is jointly defined by the first plate part 201 and the second plate part 202. Specifically, the first plate part 201 includes a second surface 210 and a third surface opposite to the second surface 210. In the processing, a groove penetrating along the width direction is formed on the first plate part 201, and then the second plate part 202 is connected to the first plate part 201, and the inner wall of the groove and the surface of the second plate part 202 facing the first plate part 201 form the mounting groove 220. It can be understood that the depth of the groove in the processing corresponds to the width of the mounting groove 220, and the depth to be processed is shallower, so that the processing of the mounting groove 220 is simpler.

[0058] It should be noted that the battery assembly in the first aspect of the present application is not limited to only one soft package battery 100, and the number of soft package batteries 100 can be two, three or four according to requirements, and the structure of the PCB board 200 needs to be adjusted accordingly.

[0059] The battery assembly of the second aspect embodiment of the utility model, comprising: the battery assembly of the first aspect embodiment, the sub-sealing part 1221 that is formed with the first surface 111 interval arrangement is set up to the sealing part 122 of top edge 120 is bent down, reduce the risk of crack of internal PP layer, thereby reduce the risk of battery assembly edge voltage bad, simultaneously, part of PCB board 200 is arranged between sub-sealing part 1221 and first surface 111, make full use of the length direction space of soft package battery 100, thereby reduce the size of battery assembly in the length direction of soft package battery 100, to improve the energy density of battery assembly, and then improve the endurance of electric equipment.

[0060] It should be noted that the battery assembly of the first aspect embodiment is adopted in the embodiment, and therefore, the embodiment has all the beneficial effects brought by the first aspect embodiment, which will not be repeated here.

[0061] The utility model embodiment has been described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, and within the knowledge range of ordinary skill in the art, various changes can be made without departing from the purpose of the utility model.In addition, in the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "schematic embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model.In the specification, the schematic description of the above-mentioned terms does not necessarily refer to the same embodiment or example.Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A battery assembly characterized by, The battery assembly comprises: a soft package battery comprising a packaging body, a top sealing edge, a cell and a tab, the cell is located in the packaging body, the packaging body has a first surface, the top sealing edge comprises an unsealed part and a sealing part connected to each other, the unsealed part is connected to the first surface, the sealing part is connected to a side of the unsealed part away from the first surface, the sealing part is arranged to be bent towards the packaging body to form a sub-sealing part spaced from the first surface, one end of the tab is connected to the cell, and the other end of the tab passes out of the top sealing edge; a PCB board located at one end of the soft package battery in the length direction, the PCB board has a second surface facing in the thickness direction of the PCB board, the second surface faces the first surface, and at least part of the PCB board is located between the sub-sealing part and the first surface, and the tab is electrically connected to the PCB board.

2. The battery assembly of claim 1, wherein, The PCB board has a third surface in the width direction of the PCB board, the PCB board has a mounting slot, the mounting slot has a slot opening, the slot opening is located on the third surface, and in the thickness direction of the PCB board, the slot opening has a first edge close to the second surface, the sub-sealing part is inserted into the mounting slot from the slot opening, and the first edge abuts against the sealing part.

3. The battery assembly of claim 2, wherein, In the thickness direction of the PCB board, the distance between the first edge and the second surface is a, and the width of the unsealed part is b, a > b.

4. The battery assembly of claim 3, wherein, The sub-sealing part comprises a first limiting part, the PCB board comprises a second limiting part, the first limiting part abuts against the second limiting part, so that the distance between the first edge and the first surface is not less than a.

5. The battery assembly of claim 2, wherein, The PCB board further has a fourth surface arranged opposite to the third surface, and an end of the sub-sealing part away from the slot opening is located between the third surface and the fourth surface.

6. The battery assembly of claim 5, wherein, The mounting slot comprises a first hole section and a second hole section, the sub-sealing part is inserted into the first hole section, the tab is inserted into the second hole section, the thickness of the sub-sealing part is L1, in the thickness direction of the sub-sealing part, the size of the first hole section is L2, and 0 ≤ L2-L1 ≤ 0.2 mm.

7. The battery assembly of claim 2, wherein, The tab is electrically connected to the inner wall of the mounting slot.

8. The battery assembly of claim 2, wherein, The PCB board comprises a first plate part and a second plate part arranged separately in the thickness direction of the PCB board, the first plate part is connected to the second plate part to jointly define the mounting slot.

9. The battery assembly of claim 2, wherein, The mounting slot is arranged to be inclined relative to the third surface.

10. An electrical device, characterized by The battery assembly comprises any one of claims 1 to 9.

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