Devices that connect components, battery modules, battery packs and battery cells as power sources

Abstract

The present application relates to the technical field of energy storage devices, and in particular to a device that uses a connection assembly, a battery module, a battery pack, and a battery cell as a power source, wherein the connection assembly includes: a connection sheet; an insulating film, wherein the insulating film is connected to a plurality of the connection sheets; wherein the insulating film is provided with a weak portion. In the present application, the insulating film is provided with a weak portion, and the strength of the weak portion is lower than that of a position where the weak portion is not provided. When subjected to force, the position of the weak portion is deformed and / or damaged, thereby reducing the risk of tearing at other positions of the insulating film, improving the flexibility of the connection assembly, and reducing the risk of the connection sheet being exposed due to the tearing of the insulating film, thereby reducing the risk of the connection sheet being short-circuited with other conductive components, and improving the safety performance of the battery module.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and to a device that uses a connection assembly, a battery module, a battery pack, and a battery cell as a power source. Background Art

[0002] The battery module includes a battery cell and a connection component, which includes a circuit board and a connection piece, wherein the connection piece is connected to the electrode lead of the battery cell, and the circuit board is connected to the connection piece, which is used to collect the temperature and voltage signals of the battery cell. At the same time, the connection piece is bonded by a hot pressing film to make multiple connection pieces form an integrated structure for easy assembly.

[0003] However, during the operation of the battery module, the battery cells have expansion force. Under the action of the expansion force of the battery cells, the hot pressing film is at risk of being torn, causing the connecting piece to leak out and posing a risk of short circuit. Summary of the invention

[0004] The present application provides a device that uses a connection component, a battery module, a battery pack, and a battery cell as a power source. The connection piece in the connection component is not easy to leak out, thereby reducing the risk of short circuit between the connection component and the battery module.

[0005] A first aspect of the present application provides a connection assembly, the connection assembly comprising:

[0006] Connecting piece;

[0007] an insulating film connected to the plurality of connecting pieces;

[0008] Wherein, the insulating film is provided with a weak portion.

[0009] In a possible design, the insulating film includes a first insulating film and a second insulating film;

[0010] Along the height direction of the connecting assembly, at least a portion of the connecting sheet is located between the first insulating film and the second insulating film;

[0011] The first insulating film and the second insulating film are both provided with the weak portion, and along the height direction of the connecting component, the weak portion located on the first insulating film and the weak portion located on the second insulating film are provided correspondingly.

[0012] In a possible design, along the height direction of the connection assembly, a projection of the weak portion of the first insulating film and a projection of the weak portion of the second insulating film at least partially overlap.

[0013] In a possible design, a center line of the weak portion of the first insulating film coincides with a center line of the weak portion of the second insulating film.

[0014] In a possible design, along the height direction of the connection assembly, the weak portion of the first insulating film and the weak portion of the second insulating film are staggered.

[0015] In a possible design, a minimum distance between the weak portion of the first insulating film and the weak portion of the second insulating film is t, and 0<t≤0.5 mm.

[0016] In a possible design, along the height direction, the first insulating film overlaps with the second insulating film, and the overlapping portion thereof is located between the weak portion of the first insulating film and the weak portion of the second insulating film.

[0017] In a possible design, the weak portion of the first insulating film is set as a first through hole, and the weak portion of the second insulating film is set as a second through hole.

[0018] In a possible design, a width dimension a of the first through hole is smaller than a width dimension b of the second through hole.

[0019] In a possible design, the length dimension L1 of the first through hole is greater than the length dimension L2 of the second through hole.

[0020] In a possible design, the first through hole includes a first body portion and a first arc-shaped portion, and along the extension direction of the first through hole, both ends of the first body portion are provided with the first arc-shaped portions;

[0021] The first arc-shaped portion is a circular structure with an opening, and the first arc-shaped portion is connected to the first main body portion through the opening;

[0022] The second through hole is an oblong hole;

[0023] The length dimension L2 of the second through hole and the length dimension L1 of the first through hole satisfy: L2≤L1-2*D, wherein D is the diameter of the first arc-shaped portion.

[0024] In a possible design, the first insulating film is provided with a first via hole, and the second insulating film is provided with a second via hole;

[0025] Along the height direction of the connecting assembly, the connecting portion of the connecting sheet is located between the first via hole and the second via hole.

[0026] A second aspect of the present application provides a battery module, the battery module comprising:

[0027] A battery cell, the battery cell comprising an electrode lead;

[0028] A connection component, wherein the connection component is the connection component described above;

[0029] The connecting portion of the connecting piece is used to connect the electrode lead of the battery cell.

[0030] A third aspect of the present application provides a battery pack, comprising a box and the above-mentioned battery module, wherein the battery module is fixed in the box.

[0031] A fourth aspect of the present application provides a device, using a battery cell as a power source, the device comprising:

[0032] a power source, the power source being used to provide driving force for the device; and,

[0033] A battery module as described above is configured to provide electrical energy to the power source.

[0034] In the present application, the insulating film is provided with a weak portion. Compared with a position where no weak portion is provided, the strength of the weak portion is lower. When subjected to force, deformation and / or damage occurs at the position of the weak portion, thereby reducing the risk of tearing at other positions of the insulating film, improving the flexibility of the connecting assembly, and reducing the risk of exposure of the connecting piece due to tearing of the insulating film, thereby reducing the risk of short circuit between the connecting piece and other conductive components, and improving the insulation performance of the battery module.

[0035] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 An exploded view of a battery module in a specific embodiment is provided for the present application;

[0037] Figure 2 for Figure 1 A schematic diagram of the structure of the connecting component in a specific embodiment;

[0038] Figure 3 for Figure 2 Exploded diagram of

[0039] Figure 4 for Figure 3 A schematic structural diagram of the first insulating film;

[0040] Figure 5 for Figure 4 A partial enlarged view of part I in the middle, wherein the weak part is the first embodiment;

[0041] Figure 6 for Figure 4 A partial enlarged view of part I, wherein the weak part is the second embodiment;

[0042] Figure 7 for Figure 4 A partial enlarged view of part II, wherein the weak part is the third embodiment;

[0043] Figure 8 for Figure 3 A schematic diagram of the structure of the second insulating film;

[0044] Fig. 9 for Figure 8 A partial enlarged view of part III, wherein the weak part is the fourth embodiment;

[0045] Fig.10 for Figure 8 A partial enlarged view of part III, wherein the weak part is the fifth embodiment;

[0046] Fig.11 is a schematic structural diagram of a weak portion in a sixth embodiment;

[0047] Fig.12 is a schematic structural diagram of a weak portion in a seventh embodiment;

[0048] Fig.13 for Figure 2 A top view of

[0049] Fig.14 for Fig.13 AA section view;

[0050] Fig.15 for Fig.13 A partial enlarged view of part IV;

[0051] Fig.16 for Fig.15 BB section view;

[0052] Fig.17 for Figure 2 Bottom view of

[0053] Fig.18 for Fig.17 A partial enlarged view of part V;

[0054] Fig.19 for Figure 2 A top view of another embodiment of the present invention;

[0055] Fig. 20 for Fig.19 CC section view;

[0056] Fig.21 This is a schematic diagram of the structure of a battery pack provided in the present application in a specific embodiment.

[0057] Reference numerals:

[0058] A-battery module;

[0059] B-box;

[0060] B1-upper box;

[0061] B2-lower box;

[0062] B3-accommodation cavity;

[0063] 1- Connect components;

[0064] 11- insulating film;

[0065] 111- a first insulating film;

[0066] 111a-first via hole;

[0067] 112- a second insulating film;

[0068] 112a - second via hole;

[0069] 12- weak part;

[0070] 121-through hole;

[0071] 121a- first body portion;

[0072] 121b-first arc portion;

[0073] 121c-first arcuate wall;

[0074] 121g-opening;

[0075] 121h- first paragraph;

[0076] 121k-Second paragraph;

[0077] 121m-third section;

[0078] 121A-first through hole;

[0079] 121B-second through hole;

[0080] 122-groove;

[0081] 122a- second body portion;

[0082] 122b- second arc portion;

[0083] 122c- a second curved wall;

[0084] 122d - bottom wall;

[0085] 122A-first groove;

[0086] 122B-second groove;

[0087] 13-connecting piece;

[0088] 131-connecting part;

[0089] 14- Circuit board;

[0090] 141-connector;

[0091] 2-Battery monomer;

[0092] 21-electrode lead;

[0093] 3- End plate;

[0094] 5-First cable tie;

[0095] 6-Second cable tie.

[0096] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0097] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0098] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0099] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0100] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0101] In the description of this application, unless otherwise clearly specified and limited, the terms "first", "second", and "first" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" means more than two, including two; the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0102] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0103] The embodiment of the present application provides a device using a battery cell 2 as a power source, a battery pack, a battery module A and a connection assembly 1, wherein the device using a battery cell 2 as a power source includes a vehicle, a ship, a small aircraft and other mobile equipment, and the device includes a power source, which is used to provide a driving force for the device, and the power source can be configured as a battery module A that provides electrical energy to the power source. The driving force of the device can be all electrical energy, or it can include electrical energy and other energy sources (such as mechanical energy), and the power source can be a battery module A (or a battery pack), and the power source can also be a battery module A (or a battery pack) and an engine, etc. Therefore, as long as the device can use a battery cell 2 as a power source, it is within the protection scope of the present application.

[0104] Taking a vehicle as an example, the vehicle in the embodiment of the present application may be a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The vehicle may include a battery pack and a vehicle body, wherein the battery pack is disposed on the vehicle body, and the vehicle body is further provided with a drive motor, and the drive motor is electrically connected to the battery pack, and the battery pack provides electrical energy, and the drive motor is connected to the wheels on the vehicle body through a transmission mechanism, thereby driving the vehicle to move forward. Specifically, the battery pack may be horizontally disposed at the bottom of the vehicle body.

[0105] like Fig.21As shown, the battery pack includes a box body B and a battery module A of the present application, wherein the box body B has a receiving cavity B3, and the battery module A is received in the receiving cavity B3. The number of battery modules A can be one or more, and multiple battery modules A are arranged in the receiving cavity B3. The type of box body B is not limited, and can be a frame-shaped box body, a disk-shaped box body, or a box-shaped box body, etc. Specifically, as Fig.21 As shown, the box body B may include a lower box body B2 for accommodating the battery module A and an upper box body B1 covering the lower box body B2.

[0106] More specifically, if Figure 1 As shown, the battery module A includes a plurality of battery cells 2 and a frame structure for fixing the battery cells 2, wherein the plurality of battery cells 2 are stacked one on another along the length direction X. The frame structure includes an end plate 3, and the end plate 3 is located at both ends of the battery cell 2 along the length direction X, and is used to limit the movement of the battery cell 2 along the length direction X. At the same time, in a specific embodiment, the frame structure may also include a side plate (not shown in the figure), and the two side plates are located on both sides of the battery cell 2 along the width direction Y, and the side plates are connected to the end plates 3, so as to form a frame structure; in another preferred embodiment, the frame structure may not be provided with a side plate, and after the battery cells 2 are stacked, they are connected by a first tie 5 or by a first tie 5 and a second tie 6, and the end plate 3 and the tie form the above-mentioned frame structure.

[0107] Specifically, the battery cells 2 include electrode leads 21, and each battery cell 2 includes a positive electrode lead and a negative electrode lead. In the battery module A, multiple battery cells 2 are electrically connected, and specifically, they can be connected in series and / or in parallel, and the battery cells 2 are connected by connecting plates 13. For example, when the battery cells 2 are connected in series, the positive electrode lead of one battery cell 2 is connected to the negative electrode lead of another battery cell 2 through the connecting plate 13.

[0108] like Figure 1 As shown, the battery module A also includes a connection assembly 1, which is placed near one end of the electrode lead 21 of the battery cell 2. Figure 1 In the illustrated embodiment, the connecting assembly 1 is located above the battery cell 2 .

[0109] In a specific embodiment, Figure 2 and Figure 3 As shown, the connection assembly 1 includes: a circuit board 14 and a connecting piece 13, the circuit board 14 is used to collect signals such as temperature and voltage during the operation of the battery cell 2, and the collected signals are output through a connector 141, and the connecting piece 13 is used to connect the electrode lead 21 of the battery cell 2, as shown in FIG. Figure 3As shown, the connection assembly 1 includes a plurality of connection pieces 13, and the setting position of each connection piece 13 changes with the position and connection mode of the battery cell 2. The circuit board 14 is electrically connected to the connection piece 13, so that the information of the battery cell 2 can be collected through the connection piece 13. The specific circuit board 14 can be an FPC or a PCB, etc., without specific limitation, as long as the information of the battery cell 2 can be collected.

[0110] At the same time, in this embodiment, Figure 3 As shown, the connection assembly 1 also includes an insulating film 11, which is connected to both the circuit board 14 and the connecting pieces 13, so that the circuit board 14 and the connecting pieces 13 are connected as a whole through the insulating film 11. At the same time, the insulating film 11 also plays an insulating role, thereby preventing the electrical components from short-circuiting.

[0111] In another specific embodiment, the connection assembly 1 includes a plurality of connection pieces 13, the connection pieces 13 are used to connect the electrode leads 21 of the battery cells 2, so as to realize the electrical connection of each battery cell 2, and the connection assembly 1 also includes an insulating film 11, the insulating film 11 is connected to each connection piece 13, and the insulating film 11 also plays an insulating role, so as to prevent short circuits between the connection pieces 13. Specifically, as described above, in the connection assembly 1, each connection piece 13 is connected to each corresponding battery cell 2, and because the battery cell 2 expands during operation, the battery cell 2 is displaced under the action of the expansion force, driving the connection piece 13 connected thereto to be displaced, thereby pulling the insulating film 11 of the connection assembly 1, resulting in the risk of the insulating film 11 being torn.

[0112] In order to solve this technical problem, in the present application, the insulating film 11 is provided with a weak portion 12. Compared with the position where the weak portion 12 is not provided, the strength of the weak portion 12 is lower. When subjected to force, deformation and / or damage occurs at the position of the weak portion 12, thereby reducing the risk of tearing at other positions of the insulating film 11, improving the flexibility of the connecting component 1, and reducing the risk of exposure of the connecting piece 13 due to tearing of the insulating film 11, thereby reducing the risk of short circuit between the connecting piece 13 and other conductive components, and improving the safety performance of the connecting component 1 and the battery module A.

[0113] At the same time, when the connecting component 1 includes a circuit board 14 and multiple connecting pieces 13, the weak portion 12 is located between adjacent connecting pieces 13, and / or the weak portion 12 is located between the connecting piece 13 and the circuit board 14, so that when the weak portion 12 ruptures under the action of the expansion force, the ruptured portion is located between adjacent connecting pieces 13, and / or the ruptured portion is located between the connecting piece 13 and the circuit board 14, and the risk of the connecting piece 13 and / or the circuit board 14 being exposed is low, thereby further improving the insulation performance of the connecting component 1 and the battery module A.

[0114] When the connection assembly 1 includes multiple connection plates 13, the weak portion 12 is located between adjacent connection plates 13, so that when the weak portion 12 ruptures under the action of the expansion force, the rupture site is located between adjacent connection plates 13, and the risk of the connection plates 13 being exposed is low, thereby further improving the insulation performance of the connection assembly 1 and the battery module A.

[0115] Specifically, Figure 4 and Figure 5 As shown, the dimension of the weak portion 12 along the length direction X of the connecting component 1 is smaller than its dimension along the width direction Y. Since the expansion force of the battery cell 2 is along the length direction X (the stacking direction of the battery cell 2), the weak portion 12 is easily deformed along the length direction X when subjected to the expansion force, thereby further improving the strength of the insulating film 11 without the weak portion 12.

[0116] In one possible design, Figure 3 As shown, the insulating film 11 is provided with a through hole 121 and / or a groove 122 , and the through hole 121 and / or the groove 122 is the above-mentioned weak portion 12 .

[0117] In this embodiment, the through hole 121 has the advantage of a simple structure, and the processing difficulty is low when the through hole 121 is set on the insulating film 11 with a relatively small thickness; the groove 122 has a bottom wall, and the thickness of the bottom wall of the groove 122 is relatively small, and deformation and / or damage are easily caused at the position with the smaller thickness, that is, the insulating film 11 remains a whole after the groove 122 is set, which can further improve the insulation performance of the connecting component 1.

[0118] like Figure 3 In the embodiment shown, the insulating film 11 includes a first insulating film 111 and a second insulating film 112, and the first insulating film 111 and the second insulating film 112 are arranged along the height direction Z of the battery module A, and the two are connected as a whole, specifically by hot pressing. At the same time, at least part of the above-mentioned circuit board 14 and multiple connecting pieces 13 are located between the first insulating film 111 and the second insulating film 112. After the two insulating films are connected, each connecting piece 13 and the circuit board 14 are connected as a module, and the two insulating films can also achieve insulation between the circuit board 14 and the battery cell 2. Therefore, the connecting assembly 1 can play the role of insulation, and can also play the role of connecting the battery cell 2, and the role of collecting information during the working process of the battery cell 2.

[0119] In another embodiment, in the connection assembly 1, at least part of the plurality of connection pieces 13 is located between the first insulating film 111 and the second insulating film 112, and after the two insulating films are connected to the connection pieces 13, the plurality of connection pieces 13 are connected into one module, and the two insulating films can also achieve insulation between the connection pieces 13. Specifically, at least one of the first insulating film 111 and the second insulating film 112 is provided with the above-mentioned weak portion 12, so that under the action of the expansion force, the first insulating film 111 can be deformed and / or ruptured at its weak portion 12, thereby improving the flexibility of the first insulating film 111; under the action of the expansion force, the second insulating film 112 can be deformed and / or ruptured at its weak portion 12, thereby improving the flexibility of the second insulating film 112.

[0120] In one possible design, Figure 4 As shown, the weak portion 12 of the first insulating film 111 is configured as a first through hole 121A or a first groove 122A; or Figure 8 As shown, the weak portion 12 of the second insulating film 112 is configured as a second through hole 121B or a second groove 122B. Figure 5 As shown, the first through hole 121A (or the second through hole 121B) includes a first body portion 121a and a first arc-shaped portion 121b, and along the extension direction of the first body portion 121a, the ends of the first body portion 121a are connected to the first arc-shaped portion 121b; Figure 6 As shown, the first groove 122A (or the second groove 122B) includes a second body portion 122a and a second arc portion 122b, and along the extension direction of the second body portion 122b, the ends of the second body portion 122a are connected to the second arc portion 122b.

[0121] It should be noted that, taking the first through hole 121A (or the second through hole 121B) as an example, the extension direction of the first body portion 121a refers to the direction of the largest end of the first body portion 121a, and the first body portion 121a does not necessarily extend in one direction, that is, the first body portion 121a can be Figure 5 , Figure 6 , Fig. 9 and Fig.10 The structure shown extending in one direction (for example, the first body portion 121a extends along the width direction Y of the connecting assembly 1) may also be Figure 7 , Fig.11 and Fig.12 The structure shown extending in multiple directions, that is, the first body portion 121a is a bent structure (for example, a portion of the first body portion 121a extends along the length direction X of the connecting component 1, and another portion extends along the width direction Y of the connecting component 1). Therefore, no matter what the structure of the first body portion 121a is, the first arc-shaped portions 121b are provided at both ends thereof.

[0122] In this embodiment, when the connecting component 1 is subjected to expansion force, the insulating film is deformed and / or ruptured at the position of its weak portion 12. The arc-shaped side wall of the first arc-shaped portion 121b can reduce the stress concentration of the weak portion 12 and reduce the risk of continued tearing of the two insulating films under the action of the expansion force, thereby improving the strength of the insulating film.

[0123] In one possible design, the arc length of the first arc portion 121b is greater than the width dimension of the end of the first main body portion 121a, wherein the end of the first main body portion 121a is the portion where the first main body portion 121a is connected to the first arc portion 121b, that is, the arc length of the first arc portion 121b is greater than the width dimension of the end of the first main body portion 121a connected thereto.

[0124] For example, the width dimension a of the end of the first body portion 121a is less than 0.3 mm, and the first body portion 121a of this width can also reduce the risk of welding slag falling from the weak portion 12 into the battery module A. Preferably, the width dimension a of the end of the first body portion 121a is ≤ 0.2 mm; further preferably, the width dimension a of the end of the first body portion 121a is ≤ 0.1 mm. The first body portion 121a has a first arcuate wall 121c at both ends along its extension direction, and the first arcuate wall 121c is the above-mentioned first arcuate portion 121b.

[0125] When the widths of the first body portion 121a at all positions are the same (for example, the cross section of the first body portion 121a is a rectangle), the arc length of the first arc portion 121b is greater than the width dimension a of the first body portion 121a.

[0126] Specifically, Figure 5 and Figure 7 In the illustrated embodiment, the weak portion 12 of the first insulating film 111 is set as a first through hole 121A, and the first through hole 121A includes a first main body portion 121a and a first arc portion 121b. The first arc portion 121b is a circular structure with an opening 121g, and the first arc portion 121b is connected with the first main body portion 121a through the opening 121g, and the two form the above-mentioned first through hole 121A. Among them, the first main body portion 121a can be a structure extending in one direction or a structure extending in multiple directions (bending structure), and the diameter D of the first arc portion 121b is greater than the width dimension a of the first main body portion 121a. When the diameter D of the circular arc-shaped first arc portion 121b is greater than the width of the first main body portion 121a, the stress concentration of the weak portion 12 at the first arc portion 121b can be further reduced.

[0127] More specifically, the cross-section of the first main body portion 121a is rectangular, and the width dimension a of the first main body portion 121a is less than 0.3mm, and the diameter D of the first arc-shaped portion 121b is less than 0.5mm. In this embodiment, the width of the first main body portion 121a is relatively small, and the diameter of the first arc-shaped portion 121b is slightly larger than the width of the first main body portion 121a. When the weak portion 12 is a through hole or a groove, the risk of welding slag falling from the first main body portion 121a into the interior of the battery module A can be reduced. In this embodiment, the first arc-shaped portion 121b of the arc structure has the advantage of easy molding, and its various positions are evenly stressed, which can further reduce the risk of stress concentration. At the same time, the first arc-shaped portion 121b with a larger diameter can further reduce the risk of tearing after being stressed. Of course, the first arc-shaped portion 121b can be as follows Figure 5-7 The circular structure shown is not necessarily a circular structure, as long as it is an arc-shaped structure.

[0128] In another possible design, Fig. 9 and Fig.11 As shown, the weak portion 12 of the second insulating film 112 is set as a second through hole 121B, and the second through hole 121B includes a first main body portion 121a and a first arc portion 121b. The weak portion 12 can be a long hole. Specifically, the cross-section of the first main body portion 121a is rectangular, and the first arc portion 121b is an arc structure, and the first arc portion 121b is tangent to the two side walls of the first main body portion 121a. At this time, the diameter D of the first arc portion 121b is equal to the width dimension a of the first main body portion 121a. In this embodiment, when the weak portion 12 is a long hole, it has the advantages of simple structure and convenient molding, and the diameter D of the first arc portion 121b is small, which can reduce the risk of welding slag falling into the connection component 1 through the first arc portion 121b.

[0129] The first body portion 121a may be a structure extending in one direction, such as Fig. 9 As shown, it can also be a structure extending in multiple directions (bending structure), such as Fig.11 As shown, no matter how the first body portion 121a extends, the end portion thereof is provided with the first arc portion 121b.

[0130] In another possible design, Fig.12As shown, the cross section of the first body portion 121a is rectangular, and the first body portion 121a can be a structure extending in one direction, or a structure extending in multiple directions (bending structure). The first arc portion 121b includes a first section 121h, a second section 121k, and a third section 121m, wherein the third section 121m is located between the first section 121h and the second section 121k, and the first section 121h, the third section 121m and the second section 121k have a smooth transition; the first section 121h and the second section 121k are both arc-shaped structures, and the first section 121h and the second section 121k are tangent to the two side walls of the first body portion 121a respectively, and the third section 121m is a curved structure, or the third section 121m is a combination of an arc structure and a straight structure.

[0131] In this embodiment, the first arc-shaped portion 121b may include one or more third sections 121m, each third section 121m is located between the first section 121k and the second section 121h, and has a smooth transition. Therefore, the first arc-shaped portion 121b may be an irregular arc-shaped structure or a regular arc-shaped structure. For example, the first arc-shaped portion 121b may be a partial elliptical structure.

[0132] Specifically, Fig.12 As shown, the cross-sectional dimension of the first arc-shaped portion 121b is larger than the width dimension a of the first main body portion 121a. At this time, the first arc-shaped portion 121b can reduce the stress concentration at the position of the weak portion 12. The width dimension a of the first main body portion 121a is less than 0.3mm. The first main body portion 121a with a smaller dimension can reduce the risk of welding slag falling from the weak portion 12 into the battery module A.

[0133] In order to further improve the reliability of the connection component 1, when the first insulating film 111 and the second insulating film 112 are both provided with a weak portion 12, along the height direction Z of the connection component 1, the weak portion 12 located in the first insulating film 111 and the weak portion 12 located in the second insulating film 112 are provided correspondingly. The "correspondingly provided" here means that the weak portion 12 located in the second insulating film 112 is provided close to the weak portion 12 located in the first insulating film 111. In this embodiment, when the weak portions 12 of the two insulating films are close to each other, under the action of the expansion force, the positions of deformation and / or rupture of the two insulating films are the same or close, so that the two insulating films can be deformed and / or ruptured synchronously, which can improve the deformation consistency of the connection component 1 under the action of the expansion force.

[0134] In one possible design, the projection of the weak portion 12 of the first insulating film 111 along the height direction Z at least partially overlaps with the projection of the weak portion 12 of the second insulating film 112 along the height direction Z. Under the action of the expansion force, the deformation and / or rupture degrees of the two insulating films are closer, thereby further improving the deformation consistency of the connecting component 1.

[0135] Among them, the projections of the two weak portions 12 respectively located in the first insulating film 111 and the second insulating film 112 along the height direction Z at least partially overlap, which means that: along the height direction Z, the projection of one weak portion 12 is located within the range of the projection of the other weak portion 12. At this time, the overlapping area of ​​the projections of the two weak portions 12 is larger, thereby further improving the deformation consistency of the two insulating films; or, the projections of the two weak portions 12 partially overlap, and the other part does not overlap. Since the overlapping area of ​​the projections of the two weak portions 12 is reduced, when the two weak portions 12 are through holes, the risk of welding slag falling into the interior of the battery module A through the overlapping area of ​​the projections of the two weak portions 12 can be reduced.

[0136] Preferably, if Fig.14 As shown, the center line O1 of the weak portion 12 of the first insulating film 111 coincides with the center line O2 of the weak portion 12 of the second insulating film 112. When the center lines of the two weak portions 12 coincide, it can be ensured that the projections of the two weak portions 12 partially coincide, and the overlapping area of ​​the two projections is large, that is, the projections of the weak portion 12 with a smaller area are all located within the projection range of the weak portion 12 with a larger area, so that the connection component 1 has a higher flexibility.

[0137] In another possible design, the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 are staggered, and there is a preset distance between the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112, and the minimum distance between the two is t, 0<t≤0.5mm. Fig. 20 In the illustrated embodiment, the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 have a preset distance along the length direction X of the connecting component 1, and the minimum distance between the edge of the weak portion 12 of the first insulating film 111 and the edge of the weak portion 12 of the second insulating film 112 adjacent thereto is t, 0<t≤0.5mm.

[0138] In this embodiment, the distance between the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 is small, that is, the two are close to each other, so under the action of the expansion force, the deformation consistency of the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 is still high, so that the flexibility of the connection component 1 is high. At the same time, when the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 are not connected along the height direction Z, even if the welding slag can enter the connection component 1 through the weak portion 12 of the first insulating film 111, it cannot enter the interior of the battery module A through the weak portion 12 of the second insulating film 112, that is, the welding slag can be effectively prevented from entering the battery module A.

[0139] Specifically, Fig. 20As shown, along the height direction Z, the first insulating film 111 overlaps with the second insulating film 112 , and the overlapping portion thereof is located between the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112 .

[0140] In this embodiment, the overlapping portion of the first insulating film 111 and the second insulating film 112 is located between adjacent connecting pieces 13 and between the weak portions 12 of the two insulating films 11, and along the length direction X, the overlapping size of the two insulating films 11 is equal to the minimum spacing t between the weak portion 12 of the first insulating film 111 and the weak portion 12 of the second insulating film 112, that is, the overlapping size 0 of the two is 0<t≤0.5mm, for example, the overlapping size t can be specifically 0.4mm, etc.

[0141] In this embodiment, the first insulating film 111 and the second insulating film 112 are overlapped with each other to increase the connection area between the two, thereby improving the connection reliability between the two. At the same time, the two weak parts 12 can be brought closer to each other by controlling the overlap size t, thereby reducing the processing difficulty of the insulating film 11 and improving the flexibility of the connecting component 1.

[0142] It should be noted that when the overlap size t of the two insulating films 11 is reduced, the first insulating film 111 and the second insulating film 112 are more easily deformed under the action of the expansion force, thereby further improving the flexibility of the connection component 1; when the overlap size t is increased, the processing difficulty of the first through hole 121A and the second through hole 121B during the molding of the connection component 1 can be reduced, and the connection reliability of the first insulating film 111 and the second insulating film 112 can be improved. Therefore, in actual working conditions, the overlap size t of the first insulating film 111 and the second insulating film 112 can be set by comprehensively considering the above two factors, and is not limited to t≤0.5mm.

[0143] In the above embodiments, the weak portion 12 of the first insulating film 111 can be set as a first through hole 121A, and the weak portion 12 of the second insulating film 112 can be set as a second through hole 121B. When the two weak portions 12 are through holes, the two insulating films 11 are easier to deform under the action of expansion force, thereby improving the flexibility of the connecting component 1.

[0144] Specifically, the width dimension a of the first through hole 121A is smaller than the width dimension b of the second through hole 121B. When the width dimension a of the first through hole 121A is smaller, the risk of welding slag entering the connection component 1 through the first through hole 121A can be reduced.

[0145] When the first through hole 121A and the second through hole 121B are two through holes, the dimension in the direction of the larger dimension is defined as the length of the through hole, and the dimension in the direction of the smaller dimension is defined as the width of the through hole, that is, no matter what the shapes of the first through hole 121A and the second through hole 121B are, their length is greater than their width.

[0146] In this embodiment, since the dimensions of the two through holes along the width direction Y are the largest, the dimension a of the first through hole 121A along the length direction X is the width dimension of the first through hole 121A, and the dimension b of the second through hole 121B along the length direction X is the width dimension of the second through hole 121B, and the widths of the two through holes satisfy: the width of the first through hole 121A located in the first insulating film 111 is smaller than the width of the second through hole 121B located in the second insulating film 112.

[0147] In addition, along the extension direction of the first body portion 121a (for example, the width direction Y of the connecting assembly), the size of the second through hole 121B is L2, and the size of the first through hole 121A is L1. As described above, along the extension direction of the first body portion 121a, the size L1 of the first through hole 121A is the length of the first through hole 121A, and the size L2 of the second through hole 121B is the length of the second through hole 121B. Therefore, the relationship between the length L1 of the first through hole 121A and the length L2 of the second through hole 121B is: L1>L2. In this embodiment, the second through hole 121B with a smaller length can reduce the risk of impurities such as welding slag entering the connecting assembly 1 through the first through hole 121A entering the battery module A through the second through hole 121B.

[0148] In a specific embodiment, the first through hole 121A of the first insulating film 111 may be Figure 5 In the structure shown in FIG. 1 , the second through hole 121B of the second insulating film 112 may be Fig. 9 Specifically, Figure 5 As shown, the first through hole 121A includes a first body portion 121a, and along the extension direction of the first body portion 121a, the end of the first body portion 121a is provided with a first arc portion 121b, and the first arc portion 121b is a circular structure with an opening 121g, and the first arc portion 121b is connected to the first body portion 121a through the opening 121g; Fig. 9 As shown, the second through hole 121B is a long hole.

[0149] At the same time, if Fig.14 As shown, the center line O1 of the first through hole 121A coincides with the center line O2 of the second through hole 121B, that is, the first through hole 121A and the second through hole 121B are connected along the height direction Z. Under the action of the expansion force, the first insulating film 111 and the second insulating film 112 can be deformed, so that the connection component 1 has higher flexibility.

[0150] Specifically, L2≤L1-2*D, where Fig.14 As shown, dimension D is the diameter of the first arc-shaped portion 121b in the first through hole 121A, L1 is the length dimension of the first through hole 121A, and L2 is the length dimension of the second through hole 121B. At the same time, the center line O1 of the first through hole 121A coincides with the center line O1 of the second through hole 121B.

[0151] In this embodiment, Figure 5 As shown, when the first through hole 121A includes a first arc-shaped portion 121b with a larger diameter D, the risk of welding slag entering the connection assembly 1 from the first arc-shaped portion 121b is relatively high. In order to reduce the risk of welding slag entering the battery module A through the first arc-shaped portion 121b, the through hole structure is not set at the position corresponding to the first arc-shaped portion 121b in the second insulating film 112, that is, the length L2 of the second through hole 121B and the length L1 of the first through hole 121A satisfy L2≤L1-2*D, so that after the welding slag enters the wiring harness isolation assembly 1 through the first arc-shaped portion 121b, the risk of welding slag entering the inner cavity of the battery module A can be reduced.

[0152] In the above embodiments, in order to effectively prevent metal particles from entering the inner cavity of the battery module A from the weak portion 12 while ensuring the release of the expansion force, the width dimension a of the first main body portion 121a is <0.3mm, preferably, a≤0.2mm; more preferably, a≤0.1mm.

[0153] Of course, the through hole structure in the above embodiments may also be a groove structure, for example, the first insulating film 111 is provided with a first groove 122A, and the second insulating film 112 is provided with a second groove 122B, wherein the first groove 122A and the second groove 122B may be structures of the same shape or structures of different shapes. Alternatively, one of the first insulating film 111 and the second insulating film 112 may be provided as a through hole 121, and the other may be provided as a groove 122. The shapes of the through hole 121 or the groove 122 of the first insulating film 111 and the through hole 121B or the groove 122B of the second insulating film 112 may be the same or different.

[0154] In a first specific embodiment, Figure 6 As shown, the first groove 122A and the second groove 122B both include a second body portion 122a, which is specifically a rectangular groove, and along the extension direction of the second body portion 122a, both ends of the second body portion 122a are provided with a second arc portion 122b, and the second arc portion 122b is an arc groove structure (with a bottom wall 122d). Specifically, the second arc portion 122b is specifically a circular arc groove. In another specific embodiment, as Fig.10As shown, the first groove 122A and the second groove 122B can both be long strip groove structures, that is, both sides of the first groove 122A and the second groove 122B along the width direction Y have a second arc wall 122c.

[0155] It can be understood that, for the through hole 121 and the groove 122, when subjected to force, the through hole 121 is more likely to deform, that is, the insulating film 11 is provided with the through hole 121, which can make the strength of the connecting assembly 1 higher, and the through hole 121 also has the advantage of easy processing. On the other hand, the groove 122 has a bottom wall, and after the groove 122 is provided, this position still has an isolation effect, thereby reducing the risk of welding slag entering the inner cavity of the battery module A through the weak part 12.

[0156] On the other hand, Figures 1 to 3 As shown, the second insulating film 112 is close to the battery cell 2, that is, when the connecting assembly 1 is installed in the battery module A, the second insulating film 112 is located below the first insulating film 111, and the connecting sheet 13 is located between the first insulating film 111 and the second insulating film 112, and both insulating films are connected to the connecting sheet 13 (specifically, they can be bonded), thereby playing the role of fixing the connecting sheet 13. At the same time, the connecting sheet 13 includes a connecting portion 131, which corresponds to and is connected to the electrode lead 21. The first insulating film 111 is provided with a first through hole 111a, and the second insulating film 112 is provided with a second through hole 112a. Along the height direction Z, the connecting portion 131 is located between the first through hole 111a and the second through hole 112a. Therefore, in the battery module A, from top to bottom, they are: the first through hole 111a, the connecting portion 131 of the connecting sheet 13, the second through hole 112a, and the electrode lead 21.

[0157] In the present embodiment, when the connecting piece 13 is connected to the corresponding electrode lead 21 (such as by welding), the first via hole 111a and the second via hole 112a serve as avoidance holes for connecting the connecting piece 13 to the corresponding electrode lead 21, which facilitates the welding of the connecting portion 131 to the electrode lead 21 and can avoid the insulation film being burned by excessively high welding temperature, resulting in the failure of the insulation film connecting the connecting piece 13, thereby improving the reliability of the connection component 1.

[0158] Therefore, in actual working conditions, each weak portion 12 of the connection component 1 can be set by comprehensively considering the above-mentioned factors, that is, each weak portion 12 can be in the form of a portion of a groove 122 and a portion of a through hole 121.

[0159] To sum up, in the present application, by setting a weak portion 12 on the insulating film 11, under the action of the expansion force of the battery cell 2, the weak portion 12 is deformed and / or ruptured, thereby reducing the risk of rupture at the position where the weak portion 12 is not set, reducing the risk of short circuit caused by exposure of the connecting piece 13, and improving the insulation performance and mechanical properties of the connecting assembly 1 and the battery module A.

[0160] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A connection assembly (1), accommodated in a battery module, characterized in that: The connection component (1) comprises: Connecting piece (13); An insulating film (11), the insulating film (11) being connected to the plurality of connecting pieces (13); The insulating film (11) is provided with a weak portion (12), the weak portion (12) comprises a through hole or a groove, the weak portion (12) extends along a width direction (Y) of the connecting component (1), and the battery cells in the battery module are arranged along a length direction (X) of the connecting component (1); The insulating film (11) comprises a first insulating film (111) and a second insulating film (112); Along the height direction (Z) of the connection assembly (1), at least a portion of the connection sheet (13) is located between the first insulating film (111) and the second insulating film (112); The first insulating film (111) and the second insulating film (112) are both provided with the weak portion (12), and along the height direction (Z) of the connecting component (1), the weak portion (12) located on the first insulating film (111) and the weak portion (12) located on the second insulating film (112) are arranged correspondingly; Along the height direction (Z) of the connecting component (1), the projection of the weak portion (12) of the first insulating film (111) and the projection of the weak portion (12) of the second insulating film (112) at least partially overlap, or the weak portion (12) of the first insulating film (111) and the weak portion (12) of the second insulating film (112) are offset.

2. The connection assembly (1) according to claim 1, characterized in that The center line of the weak portion (12) of the first insulating film (111) coincides with the center line of the weak portion (12) of the second insulating film (112).

3. The connection assembly (1) according to claim 1, characterized in that The minimum distance between the weak portion (12) of the first insulating film (111) and the weak portion (12) of the second insulating film (112) is t, and 0<t≤0.5 mm.

4. The connection assembly (1) according to claim 3, characterized in that Along the height direction (Z), the first insulating film (111) overlaps with the second insulating film (112), and the overlapping portion of the two is located between the weak portion (12) of the first insulating film (111) and the weak portion (12) of the second insulating film (112).

5. The connection assembly (1) according to any one of claims 1 to 4, characterized in that: The weak portion (12) of the first insulating film (111) is set as a first through hole (121A), and the weak portion (12) of the second insulating film (112) is set as a second through hole (121B).

6. The connection assembly (1) according to claim 5, characterized in that A width dimension a of the first through hole (121A) is smaller than a width dimension b of the second through hole (121B).

7. The connection assembly (1) according to claim 5, characterized in that The length dimension L1 of the first through hole (121A) is greater than the length dimension L2 of the second through hole (121B).

8. The connection assembly (1) according to claim 5, characterized in that The first through hole (121A) comprises a first main body portion (121a) and a first arc-shaped portion (121b); along the extension direction of the first through hole (121A), both ends of the first main body portion (121a) are provided with the first arc-shaped portion (121b); The first arc-shaped portion (121b) is a circular structure having an opening (121g), and the first arc-shaped portion (121b) is connected to the first main body portion (121a) through the opening (121g); The second through hole (121B) is a long hole; The length dimension L2 of the second through hole (121B) and the length dimension L1 of the first through hole (121A) satisfy: L2≤L1-2*D, wherein D is the diameter of the first arc-shaped portion (121b).

9. The connection assembly (1) according to any one of claims 1 to 4, characterized in that: The first insulating film (111) is provided with a first via hole (111a), and the second insulating film (112) is provided with a second via hole (112a); Along the height direction (Z) of the connection assembly (1), the connection portion (131) of the connection sheet (13) is located between the first through hole (111a) and the second through hole (112a).

10. A battery module (A), characterized in that: The battery module (A) comprises: A battery cell (2), the battery cell (2) comprising an electrode lead (21); A connection assembly (1), wherein the connection assembly (1) is the connection assembly (1) according to any one of claims 1 to 9; The connecting portion (131) of the connecting sheet (13) is used to connect the electrode lead (21) of the battery cell (2).

11. A battery pack, characterized in that: The battery pack comprises a box (B) and the battery module (A) according to claim 10, and the battery module (A) is fixed in the box (B).

12. A device using a battery cell (2) as a power source, characterized in that: The device comprises: a power source, the power source being used to provide driving force for the device; and, The battery module (A) according to claim 10 is configured to provide electrical energy to the power source.

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