Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a battery cell assembly and a protection circuit board, the battery cell assembly comprises a plurality of battery cells, each battery cell comprises a body, a tab assembly and an outer wrapping film, first chamfers are arranged at the ends, close to each other, of every two adjacent battery cells, the two ends of the first side wall of each body are connected with the second side wall and the third side wall respectively, and the outer wrapping film is provided with a first edge sealing section, a second edge sealing section and a third edge sealing section. The edge sealing sections are attached to the side wall of the body in a one-to-one correspondence mode, and notch parts are arranged at the joint of the first edge sealing section and the second edge sealing section and the joint of the first edge sealing section and the third edge sealing section. The protection circuit board is located on the first side of the battery cell assembly and is attached to the battery cells, and the protection circuit board is electrically connected with the tab assemblies of the battery cells. The problem that in the prior art, when the protection circuit board is arranged in the direction close to the battery cell, the space of the head of the battery is wasted can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, and in particular to a battery pack. Background Art

[0002] As electronic products become more intelligent, their power consumption is increasing. In order to extend the service life of electronic products, their batteries are formed by connecting multiple cells in series or in parallel. This solution usually folds the top edge of the cell flat and places the protection plate flat on the top of the cell to reduce the total length of the battery and increase the space occupancy rate. However, when conventional batteries fold the top and side seals toward the cell body, the top and side seals interfere with each other, resulting in sharp corners, which affects the placement of the protection plate close to the cell, thereby wasting the head space of the battery. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery pack, which at least solves the problem in the prior art that when the battery is folded and sealed, the top seal and the side seal interfere with each other to produce sharp angles, which affects the setting of the protection circuit board in the direction close to the battery cell and causes waste of battery head space.

[0004] According to one aspect of the utility model, a battery pack is provided, comprising:

[0005] A cell assembly, the cell assembly comprising a plurality of cells, the plurality of cells are arranged side by side along the x direction, each of the cells comprises a body, a tab assembly and an outer film, the tab assembly is electrically connected to the body, the outer film covers the body, and on a first side of the cell assembly, ends of two adjacent cells close to each other are each provided with a first chamfer, the body comprises a first side wall extending along the x direction, a second side wall extending along the z direction and a third side wall extending along the z direction, both ends of the first side wall are respectively connected with the second side wall and the third side wall, the outer film comprises a first edge sealing section, a second edge sealing section and a third edge sealing section, the first edge sealing section is arranged against the first side wall, the second edge sealing section is arranged against the second side wall, the third edge sealing section is arranged against the third side wall, and a notch is arranged at a position where the first edge sealing section and the second edge sealing section meet, and at a position where the first edge sealing section and the third edge sealing section meet;

[0006] A protection circuit board extends along the x-direction, is located on a first side of the battery cell assembly and is disposed close to the battery cell, and is electrically connected to the tab assembly of each battery cell.

[0007] Furthermore, when projected along the z direction, the protection circuit board is located within the projection range of the battery cell assembly.

[0008] Furthermore, the protection circuit board includes a PCB board and multiple FPC boards, extending along the x direction, the PCB board includes a first end and a second end, and the first end and the second end are respectively connected to at least one of the FPC boards.

[0009] Furthermore, the first chamfer includes a chamfered corner or a rounded corner.

[0010] Further, the degree α of the chamfer angle satisfies the relationship: 30°≤α≤60°, and / or;

[0011] Along the x direction, the width L1 of the chamfer satisfies the relationship: 2mm≤L1≤5mm.

[0012] Further, the battery pack includes a y direction, the x direction, the y direction and the z direction are perpendicular to each other, and within the projection of the y direction, the contour line of the notch portion includes at least one straight line segment and / or at least one arc segment.

[0013] Furthermore, the contour line includes a first straight line segment, and a minimum distance L2 between the first straight line segment and the first chamfer satisfies the relationship: 2mm≤L2≤5mm.

[0014] Further, the contour line includes a second straight line segment and a third straight line segment, and the second straight line segment intersects the third straight line segment at an obtuse angle;

[0015] Wherein, the angle α1 between the second straight line segment and the z direction satisfies the relationship: 5°≤α1≤80°; and / or,

[0016] The angle α2 between the third straight line segment and the x direction satisfies the relationship: 5°≤α2≤80°.

[0017] Furthermore, the center of the arc segment is located on a side of the arc segment away from the main body.

[0018] Further, a position where the third edge sealing section is connected to the first edge sealing section and / or a position where the second edge sealing section is connected to the first edge sealing section has a cavity, and a temperature sensor is arranged in the cavity.

[0019] Further, the tab assembly is arranged to protrude from the first edge sealing section; or,

[0020] The tab assembly is arranged to protrude from the second edge sealing section; or,

[0021] The tab assembly is arranged to protrude from the third edge sealing section.

[0022] In the utility model, by arranging a plurality of battery cells in a battery pack, and the plurality of battery cells are arranged in parallel in sequence along the x direction, wherein the plurality of battery cells can be arranged in series or in parallel, the use time of the electronic product can be extended. Each battery cell includes a body, a tab assembly and an outer film; the tab assembly is electrically connected to the body to achieve a conductive effect and ensure the normal operation of the battery pack; the outer film is coated and arranged on the outside of the body of the battery cell, which plays a sealing role for the battery pack, and can effectively isolate the influence of the outside world on the battery cell, thereby improving the working efficiency and service life of the battery pack. On the first side of the battery cell assembly, the ends of the two adjacent battery cells close to each other are both provided with a first chamfer, and a notch is provided at the intersection of the first edge sealing section and the second edge sealing section of the outer film, and at the intersection of the first edge sealing section and the third edge sealing section. In this way, when the outer film is fitted with the side wall of the body, there will be no interference between them, and no sharp corners will be generated, which provides favorable conditions for the protection circuit board to be arranged on the first side of the plurality of battery cells. Specifically, when the protection circuit board is electrically connected to the tab assembly on the battery cell, the distance between the two is shorter, which reduces the waste of head space in the battery pack, reduces the length of the battery pack at the same volume, and improves the energy density of the battery pack at the same battery capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the battery cell (without the protection circuit board) disclosed in the embodiment of the utility model when it is at a first viewing angle;

[0025] Figure 2 This is a schematic diagram showing that the outline of the notch of the outer film of the battery cell disclosed in the embodiment of the utility model is a straight line segment;

[0026] Figure 3 This is a schematic diagram showing that the outline of the notch portion of the outer film of the battery cell disclosed in the embodiment of the utility model is two straight line segments;

[0027] Figure 4 A schematic diagram showing that the outline of the notch of the outer film of the battery cell disclosed in the embodiment of the utility model is an arc segment;

[0028] Figure 5 It is a schematic structural diagram of a battery pack in which a tab assembly protrudes from a third edge sealing section according to an embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of the structure of the tab assembly of the battery pack disclosed in the embodiment of the utility model protruding from the second edge sealing section;

[0030] Figure 7 It is a schematic diagram of the structure of a battery pack disclosed in an embodiment of the utility model when it is composed of two battery cells;

[0031] Figure 8 It is a left side view of the battery pack (with plastic parts) disclosed in the embodiment of the utility model;

[0032] Fig. 9 for Figure 8 A partial enlarged view of area A.

[0033] The above drawings include the following reference numerals:

[0034] 10. Battery cell; 11. Body; 111. First side wall; 112. Second side wall; 113. Third side wall; 12. Ear assembly; 13. Outer film; 1311. First edge sealing section; 1312. Second edge sealing section; 1313. Third edge sealing section; 132. Notch; 133. Contour line; 1331. Straight line section; 13311. First straight line section; 13312. Second straight line section; 13313. Third straight line section; 1332. Arc line section; 14. First chamfer; 141. Chamfer; 20. Protection circuit board; 21. PCB board; 211. First end section; 212. Second end section; 22. FPC board; 30. Cavity; 40. Temperature sensor; 50. Plastic part. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0038] As mentioned in the background technology, in order to make the use time of electronic products longer, the battery is formed by connecting multiple cells in series or in parallel. This solution usually folds the top edge of the cell flat and places the protective plate flat on the top of the cell to reduce the total length of the battery in the length direction and improve the space occupancy rate. However, when the top edge and side edge of a conventional battery are folded toward the cell body, the top edge interferes with the side edge, which will produce sharp corners, affecting the placement of the protective plate in the direction close to the cell, thereby resulting in a waste of space at the head of the battery. To this end, the present application proposes a battery pack, which can be used when the edge segments of the outer film are bonded to the body without interfering with each other, and no sharp corners are generated. The protective circuit board is bonded with multiple cells, which reduces the total length of the battery pack in the length direction and the space waste at the head of the battery pack, and improves the energy density of the battery pack to a certain extent. The battery pack of the present application will be described in detail in conjunction with the accompanying drawings.

[0039] like Figures 1 to 9 As shown, according to an embodiment of the present application, a battery pack is provided. The battery pack includes a battery cell assembly and a protection circuit board 20.

[0040] In this embodiment, the battery cell assembly includes a plurality of battery cells 10, and the plurality of battery cells 10 are arranged side by side along the x direction. Each battery cell 10 includes a body 11, a tab assembly 12 and an outer film 13. The tab assembly 12 is electrically connected to the body 11, and the outer film 13 covers the body 11. On the first side of the battery cell assembly, the ends of two adjacent battery cells 10 close to each other are both provided with a first chamfer 14. The body 11 includes a first chamfer 14 along the x direction (i.e. Figures 1 to 6 The first side wall 111 extending in the length direction of the battery cell 10, along the z direction (i.e. Figures 1 to 6The second side wall 112 extending in the height direction of the battery cell 10 and the third side wall 113 extending in the z direction, the two ends of the first side wall 111 are respectively connected with the second side wall 112 and the third side wall 113, the outer film 13 has a first edge sealing section 1311, a second edge sealing section 1312 and a third edge sealing section 1313, the first edge sealing section 1311 is arranged close to the first side wall 111, the second edge sealing section 1312 is arranged close to the second side wall 112, and the third edge sealing section 1313 is arranged close to the third side wall 113, and a notch 132 is arranged at the intersection of the first edge sealing segment 1311 and the second edge sealing segment 1312, and at the intersection of the first edge sealing segment 1311 and the third edge sealing segment 1313; a protective circuit board 20, the protective circuit board 20 extends along the x direction, the protective circuit board 20 is located on the first side of the battery cell assembly and is arranged close to the battery cell 10, and the protective circuit board 20 is electrically connected to the tab assembly 12 of each battery cell 10.

[0041] In the present application, multiple battery cells 10 are arranged in a battery pack, and the multiple battery cells 10 are arranged side by side in sequence along the x direction, wherein the multiple battery cells 10 can be arranged in series or in parallel. For example, the number of battery cells 10 can be 2, 3, 4, etc., so that the use time of electronic products can be extended. Each battery cell 10 includes a body 11, a tab assembly 12, and an outer film 13; the tab assembly 12 is electrically connected to the body 11 to achieve conductivity and ensure the normal operation of the battery pack; the outer film 13 is coated on the outside of the body 11 of the battery cell 10, and plays a sealing role on the battery pack, which can effectively isolate the influence of the outside world on the battery cell 10, and improve the working efficiency and service life of the battery pack. On the first side of the battery cell assembly, the ends of two adjacent battery cells 10 that are close to each other are both provided with a first chamfer 14, and a notch 132 is provided at the intersection of the first edge sealing section 1311 and the second edge sealing section 1312 of the outer film 13, and at the intersection of the first edge sealing section 1311 and the third edge sealing section 1313. In this way, when the outer film 13 is attached to the side wall of the body 11, there will be no interference between them, and no sharp corners will be generated, which provides favorable conditions for the protection circuit board 20 to be set on the first side of multiple battery cells 10. Specifically, when the protection circuit board 20 is electrically connected to the tab assembly 12 on the battery cell 10, the distance between the two is shorter, which reduces the waste of the head space of the battery pack, reduces the length of the battery pack at the same volume, and improves the energy density of the battery pack at the same battery capacity.

[0042] That is to say, in this embodiment, a plurality of battery cells 10 are arranged in the battery pack, and a first chamfer 14 is arranged at the ends of two adjacent battery cells 10 that are close to each other. At the same time, a notch 132 is arranged at the intersection of the first edge sealing section 1311 and the second edge sealing section 1312 of the outer film 13, and at the intersection of the first edge sealing section 1311 and the third edge sealing section 1313. In this way, when the two adjacent battery cells 10 are sealed with the outer film 13, there will be no interference between the edge sealing sections, and the sharp corners are eliminated. When the protection circuit board 20 is electrically connected to the tab assembly 12, the distance between the protection circuit board 20 and the battery cell 10 is reduced, the space occupancy rate is improved, and the energy density of the battery pack is improved at the same battery capacity. In addition, when the protection circuit board 20 is electrically connected to the tab assembly 12, the protection circuit board 20 does not need to be hollowed out, which improves the efficiency of battery pack packaging.

[0043] In this embodiment, along the projection of the z direction, the protection circuit board 20 is located within the projection range of the battery cell assembly. The protection circuit board 20 is located on the first side of the battery cell assembly, and the length of the protection circuit board 20 is less than the length of the first side of the battery cell assembly. In this way, when the two ends of two adjacent battery cells 10 that are far away from each other are not provided with the first chamfer 14, the distance between the protection circuit board 20 and the battery cell 10 can also be reduced, and the energy density of the battery pack can also be improved under the same battery capacity.

[0044] See also Figure 7 As shown, the protection circuit board 20 includes a PCB board 21 and a plurality of FPC boards 22. When extending along the x direction, the PCB board 21 includes a first end 211 and a second end 212. At least one FPC board 22 is connected to each of the two ends of the PCB board 21. The FPC board 22 is a flexible circuit board, which can be bent as needed during the actual production and processing process so that the protection circuit board 20 can be better electrically connected to the tab assembly 12. Exemplarily, the number of FPC boards 22 at one end of the PCB board 21 can be 1, 2, 3, etc. In actual production and processing, the number of appropriate FPC boards 22 is selected according to the situation of the protection battery core assembly, as long as the electrical connection with the tab assembly 12 can be achieved.

[0045] See also Figure 1 As shown, the first chamfer 14 can be set as a chamfer 141, and can also be set as a rounded corner. In the present embodiment, the first chamfer 14 is preferably set as a chamfer 141. The first chamfer 14 can be set at at least one of the two ends of the battery cell 10, and can be set at both ends of the battery cell 10. It is worth noting that in the present embodiment, the ends of two adjacent battery cells 10 in the battery cell assembly that are close to each other are both provided with a first chamfer 14, which can better seal the battery cell 10 and improve the energy density of the battery pack during the subsequent packaging process of the battery pack. The present application Figures 1 to 7 The figure shows a case where chamfers 141 are provided at both ends of a battery cell 10 .

[0046] Furthermore, if Figure 2 As shown, in the present application, the degree α of the chamfer angle 141 satisfies the relationship: 30°≤α≤60°. For example, the degree of α can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc. In the present embodiment, the degree of α is preferably set to 45°. When the degree is 45°, the operation of setting the chamfer angle 141 on the battery cell 10 is the simplest, and the work difficulty can be reduced and the work efficiency can be improved in actual processing. In addition, along the x direction, the width L1 of the chamfer 141 satisfies the relationship: 2mm≤L1≤5mm. For example, the value of L1 can be 2mm, 3mm, 4mm, 5mm, etc. When the width L1 is less than 2mm, the processing difficulty of the chamfer 141 is increased; if the width L1 is greater than 5mm, the volume of the battery cell 10 cut off is large, resulting in poor sealing when the edge sealing sections of the outer film 13 are fitted to the body 11, and the capacity of the battery pack may also be reduced.

[0047] See also Figures 2 to 4 As shown, the x direction and y direction (i.e. Figures 1 to 6 The thickness direction of the battery cell 10 and the z direction are perpendicular to each other. In the projection in the y direction, the contour line 133 of the notch 132 can be at least one straight line segment 1331 and / or at least one arc segment 1332. In this embodiment, no matter what type of line the contour line 133 of the notch 132 is, as long as it can be ensured that when the outer film 13 is subsequently attached to the body 11, the edge sealing segments of the outer film 13 do not interfere with each other, do not form sharp corners, and do not affect the safety of the outer film 13.

[0048] Further, Figure 2 The figure shows the situation when the contour line 133 of the notch 132 is a straight line segment 1331. In this embodiment, the contour line 133 includes a first straight line segment 13311, so that the edge sealing segments of the outer film 13 of the battery pack are changed from the original three edge sealing segments to five edge sealing segments, thereby improving the sealing performance of the battery cell 10. Among them, the minimum distance L2 between the first straight line segment 13311 and the first chamfer 14 satisfies the relationship: 2mm≤L2≤5mm. For example, the value of the minimum distance L2 can be 2mm, 3mm, 4mm, 5mm, etc. If the minimum distance L2 is less than 2mm, the sealing effect of each edge of the outer film 13 on the battery cell 10 may be poor when it is attached to the body 11, thereby reducing the safety of the battery pack; if the minimum distance is greater than 5mm, the size of the battery pack is increased, resulting in a decrease in the energy density of the battery pack under the same volume.

[0049] Further, Figure 3 The figure shows the situation when the contour line 133 of the notch 132 is two straight line segments 1331. Specifically, the contour line 133 in this embodiment includes a second straight line segment 13312 and a third straight line segment 13313, and the second straight line segment 13312 intersects with the third straight line segment 13313 and forms an obtuse angle. The use of this type of linear contour line 133 can also prevent the edge seal on the outer film 13 from interfering when it is fitted with the body 11, and will not produce sharp corners to cause rupture of the outer film 13, which also reduces the difficulty of the battery pack assembly process to a certain extent. It is worth noting that the angle α1 between the second straight line segment 13312 and the z direction satisfies the relationship: 5°≤α1≤80°; the angle α2 between the third straight line segment 13313 and the x direction satisfies the relationship: 5°≤α2≤80°. For example, the degree values ​​of α1 and α2 can be 5°, 10°, 30°, 60°, 70°, 80°, etc. In actual production and processing, if the degree values ​​of α1 and α2 are less than 5°, the production difficulty will be increased, which is not conducive to the cutting of the second straight line segment 13312 and the third straight line segment 13313, and may have an adverse effect on the packaging of the battery pack; if the degree values ​​of α1 and α2 are greater than 80°, sharp corners may appear when the outer film 13 is fitted with the main body 11, causing the outer film 13 to break, and failing to seal the battery cell 10 well, affecting the safety of the battery pack.

[0050] Further, Figure 4 The figure shows the case where the outline 133 of the notch 132 is an arc segment 1332. In this embodiment, the center of the arc segment 1332 is located on the side of the arc segment 1332 away from the body 11. With this arrangement, when the outer film 13 is attached to the body 11, no sharp corners are generated between the sealing edge segments of the outer film 13, and the outer film 13 is not easy to rupture, thereby improving the safety of the battery pack.

[0051] Specifically, in the present application, the contour line 133 of the notch 132 is preferably set as a straight line segment 1331, which is simpler to operate during actual production and processing, and has better sealing performance for the battery cell 10, which not only simplifies the process but also makes the appearance of the battery pack more beautiful.

[0052] See also Figures 1 to 7 As shown, in this embodiment, by providing notches 132 at the intersection of the first edge sealing segment 1311 and the second edge sealing segment 1312 of the outer film 13, and at the intersection of the first edge sealing segment 1311 and the third edge sealing segment 1313, and then bending the outer film 13 by bending or stamping, it is more conducive to sealing and wrapping the battery cell 10, ensuring the safety and stability of the battery cell 10, thereby improving the performance of the battery pack in actual work.

[0053] Further, in the present embodiment, the cavity 30 can be provided between two adjacent battery cells 10, or can be provided on any battery cell 10 at both ends of the battery pack and between two adjacent battery cells 10, or can be provided on the battery cells 10 at both ends of the battery pack and between two adjacent battery cells 10 at the same time. Specifically, in the first case, the ends of two adjacent battery cells 10 close to each other are both provided with a first chamfer 14, and a cavity 30 will be formed at the two first chamfers 14 of the two adjacent battery cells 10; in the second case, the first chamfer 14 is provided on any battery cell 10 at both ends of the battery pack, that is, when the first edge sealing section 1311 and the second edge sealing section 1312 are attached to the body 11, or when the first edge sealing section 1311 and the third edge sealing section 1313 are attached to the body 11, there will also be a cavity 30 at the position where the first edge sealing section 1311 is connected to the second edge sealing section 1312, or at the position where the second edge sealing section 1312 is connected to the first edge sealing section 1311. The third situation: the two battery cells 10 at both ends of the battery pack are provided with cavities 30 , and the first chamfer 14 between two adjacent battery cells 10 has a cavity 30 .

[0054] Furthermore, for some high-power battery packs, a temperature sensor 40 is set in the cavity 30 to monitor the temperature of the battery cell 10 in real time to prevent the battery pack from being adversely affected by excessive temperature. This arrangement does not occupy the space of the finished battery pack and further improves the safety of the high-power battery pack during the actual charging and discharging process. The temperature sensor 40 can be set in any of the above cavities 30. Figure 7 2 shows a case where the temperature sensor 40 is disposed in the cavity 30 of one of the battery cells 10 at both ends of the battery pack. For example, the temperature sensor 40 can be placed in the cavity 30 by welding, snap connection, screw connection, etc. In this embodiment, the connection method is preferably set to welding, which can avoid damaging the internal structure of the battery cell 10 and ensure the safety of the battery pack during operation.

[0055] See also Figures 1 to 6 As shown, during actual packaging, the tab assembly 12 may protrude from the first edge sealing section 1311, may protrude from the second edge sealing section 1312, or may protrude from the third edge sealing section 1313. In this embodiment, the tab assembly 12 is preferably arranged to protrude from the first edge sealing section 1311, and the tab assembly 12 is located between the two chamfers 141, which is more conducive to improving the electrical and mechanical properties of the battery pack, and in actual operation, avoids affecting the charging and discharging performance and mechanical properties of the battery pack. In addition, the tab assembly 12 is arranged to protrude from the first edge sealing section 1311, which reduces the operating steps in actual production and processing, and the process is simpler.

[0056] Furthermore, in the actual production and processing process, since the protection circuit board 20 is electrically connected to the tab assembly 12, it is easy to contact with the conductive material in the external environment, causing a short circuit problem in the battery pack; and each edge sealing section of the outer film 13 is obtained by cutting the outer film 13. After cutting, the conductive material on the outer film 13 is also easy to contact with the conductive material in the environment, causing a short circuit problem. Therefore, insulation treatment is performed at the first edge sealing section 1311, the second edge sealing section 1312 and the third edge sealing section 1313 of the protection circuit board 20 and the outer film 13 to reduce the impact of the external environment on the battery pack. In this embodiment, the insulation treatment can be performed by coating the cut parts of the protection circuit board 20 and the outer film 13 with an insulating member to prevent the cut parts of the protection circuit board 20 and the outer film 13 from directly contacting the external environment and causing a short circuit problem in the battery pack. The insulating member can be at least one of an organic insulating layer and an inorganic insulating layer.

[0057] Further, see Figure 8 and Fig. 9 As shown, after the protection circuit board 20 is electrically connected to the tab assembly 12, there will be a gap between the protection circuit board 20 and the battery cell assembly. A plastic part 50 may or may not be provided between the gaps. In this embodiment, the gaps are preferably filled with a plastic part 50 by injection molding to enhance the structural strength of the battery pack.

[0058] According to the above embodiments, the battery pack of the present application can at least achieve the following technical effects:

[0059] (1) In the present application, by setting chamfers at the ends of two adjacent battery cells that are close to each other, and setting notches at the intersection of the first edge sealing section and the second edge sealing section, and at the intersection of the first edge sealing section and the third edge sealing section, the edge sealing sections of the outer film will not interfere with each other when they are arranged in affixed relation with the side wall of the body, thereby eliminating sharp corners during battery pack packaging. When multiple battery cells are arranged side by side, the distance between the protection circuit board and the tab assembly of the battery cell is shorter when they are electrically connected, thereby improving the space occupancy rate, reducing the total length of the battery pack in the length direction of the battery pack, and improving the energy density of the battery pack to a certain extent under the same battery capacity;

[0060] (2) The present application provides a notch at the intersection of the first edge sealing section and the second edge sealing section, and provides a notch at the intersection of the first edge sealing section and the third edge sealing section, thereby avoiding interference between the edge sealing sections of the outer film and the side wall of the body when they are fitted together, eliminating sharp corners during battery pack packaging, improving the safety of the battery cell and the sealing of the battery cell, simplifying the operation, and improving the production efficiency of the battery pack;

[0061] (3) The present application arranges a temperature sensor in a cavity formed at the intersection of the first edge sealing section and the second edge sealing section and the chamfered corner of the battery cell, or in a cavity formed at the intersection of the first edge sealing section and the third edge sealing section and the chamfered corner of the battery cell, or arranges a temperature sensor in a cavity formed after chamfers are set at the ends of two adjacent battery cells close to each other; in this way, the temperature of the battery pack can be monitored in real time without occupying the space of the finished battery pack;

[0062] (4) The present application improves the safety of the battery pack by providing insulation at the cutting point between the protective circuit board and the outer film.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery cell assembly, the battery cell assembly comprising a plurality of battery cells (10), the plurality of battery cells (10) being arranged side by side along the x-direction, each of the battery cells (10) comprising a body (11), a tab assembly (12) and an outer film (13), the tab assembly (12) being electrically connected to the body (11), the outer film (13) covering the body (11), and on a first side of the battery cell assembly, the ends of two adjacent battery cells (10) close to each other are each provided with a first chamfer (14), the body (11) comprising a first side wall (111) extending along the x-direction, a second side wall (112) extending along the z-direction and a third side wall (113) extending along the z-direction, the two ends of the first side wall (111) being respectively connected to the first side wall (111) and the second side wall (112) extending along the z-direction. The second side wall (112) and the third side wall (113) are connected, and the outer envelope (13) comprises a first edge sealing section (1311), a second edge sealing section (1312) and a third edge sealing section (1313); the first edge sealing section (1311) is arranged close to the first side wall (111), the second edge sealing section (1312) is arranged close to the second side wall (112), and the third edge sealing section (1313) is arranged close to the third side wall (113); and a notch (132) is arranged at a position where the first edge sealing section (1311) and the second edge sealing section (1312) are connected, and at a position where the first edge sealing section (1311) and the third edge sealing section (1313) are connected; A protective circuit board (20), the protective circuit board (20) extending along the x-direction, the protective circuit board (20) being located on a first side of the battery cell assembly and disposed close to the battery cell (10), and the protective circuit board (20) being electrically connected to the tab assembly (12) of each of the battery cells (10).

2. The battery pack according to claim 1, characterized in that: Projected along the z direction, the protection circuit board (20) is located within the projection range of the battery core assembly.

3. The battery pack according to claim 1, characterized in that: The protective circuit board (20) comprises a PCB board (21) and a plurality of FPC boards (22), and extends along the x-direction; the PCB board (21) comprises a first end (211) and a second end (212); the first end (211) and the second end (212) are respectively connected to at least one of the FPC boards (22).

4. The battery pack according to claim 1, characterized in that: The first chamfer (14) comprises a chamfer (141) or a rounded corner.

5. The battery pack according to claim 4, characterized in that: The degree α of the chamfer angle (141) satisfies the relationship: 30°≤α≤60°, and / or; Along the x direction, the width L1 of the chamfer (141) satisfies the relationship: 2mm≤L1≤5mm.

6. The battery pack according to claim 2, characterized in that: The battery pack includes a y direction, the x direction, the y direction and the z direction are perpendicular to each other, and within the projection of the y direction, the contour line (133) of the notch portion (132) includes at least one straight line segment (1331) and / or at least one arc segment (1332).

7. The battery pack according to claim 6, characterized in that: The contour line (133) includes a first straight line segment (13311), and the minimum distance L2 between the first straight line segment (13311) and the first chamfer (14) satisfies the relationship: 2mm≤L2≤5mm.

8. The battery pack according to claim 6, characterized in that: The contour line (133) includes a second straight line segment (13312) and a third straight line segment (13313), and the second straight line segment (13312) intersects with the third straight line segment (13313) at an obtuse angle; The angle α1 between the second straight line segment (13312) and the z direction satisfies the relationship: 5°≤ α1≤80°; and / or, The angle α2 between the third straight line segment (13313) and the x direction satisfies the relationship: 5°≤α2≤80°.

9. The battery pack according to claim 6, characterized in that: The center of the arc segment (1332) is located on the side of the arc segment (1332) that faces away from the main body (11).

10. The battery pack according to claim 2, characterized in that: A position where the third edge sealing section (1313) is connected to the first edge sealing section (1311) and / or a position where the second edge sealing section (1312) is connected to the first edge sealing section (1311) has a cavity (30), and a temperature sensor (40) is arranged in the cavity (30).

11. The battery pack according to claim 10, characterized in that: The tab assembly (12) is arranged to protrude from the first edge sealing section (1311); or, The tab assembly (12) is arranged to protrude from the second edge sealing section (1312); or, The pole tab assembly (12) is arranged to protrude from the third edge sealing section (1313).

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