Connecting piece and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a connecting piece and a battery pack, the connecting piece is used for connecting two battery modules which are arranged side by side, and the positive electrode of one battery module is opposite to the negative electrode of the other battery module; the connecting piece is bent to form two ends which are parallel to each other and are spaced from each other, and the two ends of the connecting piece are respectively connected to the opposite positive electrodes and negative electrodes of the two battery modules, so that the two battery modules are connected in series. The connecting piece can be used for connecting the positive electrodes and the negative electrodes of the two opposite battery modules, and meanwhile, the two ends of the connecting piece are arranged in parallel and at an interval, so that the risk of short circuit is reduced, and the safety of electric connection is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a connecting piece and a battery pack. Background Art

[0002] A battery is a product formed by combining battery cells in series and / or parallel, and installing a single battery monitoring and thermal management device. The battery can be formed by combining square battery cells, cylindrical battery cells, or soft-pack batteries, and is widely used in fields such as laptop computers, mobile power supplies, power tools, and electric vehicles.

[0003] In the prior art, multiple single battery cells are connected in series and / or in parallel into a group, mainly by welding the positive and negative electrode posts of each single battery cell together through a battery connecting piece according to design requirements. However, the current battery connecting pieces are generally used for connecting when the positive and negative electrode posts of the battery cells are on the same plane. When the number of battery cells increases or the electrode posts of the battery cells are arranged opposite to each other, the connecting piece cannot effectively connect the two electrode posts, which is extremely likely to cause short circuit between the positive and negative electrodes, increasing the insecurity of the battery.

[0004] Therefore, there is an urgent need for a connecting piece and a battery pack to solve the above problems. Summary of the Utility Model

[0005] An object of the utility model is to provide a connecting piece, which can connect the positive and negative electrodes of two battery modules arranged opposite to each other, reduce the short-circuit risk, and ensure the safety of electrical connection.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A connecting piece is used to connect two battery modules arranged side by side, where the positive electrode of one battery module is opposite to the negative electrode of the other battery module;

[0008] The connecting piece forms two ends that are parallel to each other and have a gap through its own bending. The two ends of the connecting piece are respectively connected to the opposite positive and negative electrodes of the two battery modules to connect the two battery modules in series.

[0009] Optionally, through holes for positioning with the cell bracket of the battery module are arranged at intervals on the connecting piece.

[0010] Another object of the utility model is to provide a battery pack, which includes a wiring output piece, two battery modules arranged side by side, and the connecting piece described in the above solution. Each battery module includes multiple cell groups with different polarities on the same side, and the multiple cell groups are connected in series end to end in sequence. The two cell groups at the opposite ends of the same side of the two battery modules are connected in series through the connecting piece, and the two cell groups at the other ends of the two battery modules are respectively connected to the wiring output piece.

[0011] Optionally, it further includes connecting bars, and multiple battery cell groups in each battery module are connected in series through the connecting bars.

[0012] Optionally, each battery cell group includes multiple battery cells with the same polarity on the same side, the length direction of the battery cells is parallel to the second direction, and the multiple battery cells are arranged in sequence along the first direction; and / or,

[0013] The multiple battery cells are arranged in sequence along the third direction, and the third direction, the second direction, and the first direction are perpendicular to each other in pairs.

[0014] Optionally, it further includes a box body and a filling and fixing layer. Two battery modules are arranged side by side in the box body along the second direction, the filling and fixing layer is arranged in the gap between the box body and the battery module, and the filling and fixing layer is a foaming glue fixing layer.

[0015] Optionally, the battery module includes two battery cell brackets, the two battery cell brackets are parallel to each other and arranged at intervals along the second direction, a plurality of mounting holes are formed in the battery cell brackets, and two ends of the battery cells are respectively inserted into a group of corresponding mounting holes on the two battery cell brackets.

[0016] Optionally, a positioning block is arranged on a side of the battery cell bracket facing away from the battery cell, the shape of the positioning block matches the shape of the through hole of the connecting piece, and the through hole is sleeved outside the positioning block.

[0017] Optionally, the battery module further includes a fixing piece, the fixing piece is arranged parallel to the second direction, and two ends of the fixing piece are respectively connected to the two battery cell brackets.

[0018] Optionally, the wiring output piece includes a connecting plate, the connecting plate is electrically connected to the positive electrode or the negative electrode of the battery module that is not connected to the connecting piece, an output plate is arranged on a side of the connecting plate away from the bottom of the box body, and the output plate extends to protrude from the battery module and is connected to the acquisition line.

[0019] Optionally, the output plate includes a lead-out portion and an output portion fixedly connected at an angle, the lead-out portion is connected to the connecting plate and extends along the side surface of the battery module in a direction away from the bottom of the box body, the output portion extends along the upper surface of the battery module, and the output portion is connected to the acquisition line.

[0020] Advantages of the present utility model:

[0021] The connecting piece provided by the present utility model is used to connect two battery modules arranged side by side. Specifically, the two battery modules are arranged side by side, and the positive electrode of one battery module faces the negative electrode of the other battery module. The connecting piece forms two ends that are parallel to each other and have a gap through its own bending, that is, the connecting piece is bent into a U-shaped structure after bending. The two ends of the connecting piece are respectively connected to the opposite positive and negative electrodes of the two battery modules to connect the two battery modules in series. At the same time, the parallel and spaced arrangement of the two ends of the connecting piece can also separate the positive and negative electrodes of the two battery cell modules, which helps to reduce the risk of short circuit and ensure the safety of electrical connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present utility model. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0023] Figure 1 is a schematic structural diagram of a battery pack provided by an embodiment of the present utility model;

[0024] Figure 2 is a schematic structural diagram of a battery pack (hiding the filling and fixing layer) provided by an embodiment of the present utility model;

[0025] Figure 3 is a cross-sectional view of a battery pack provided by an embodiment of the present utility model;

[0026] Figure 4 is a schematic structural diagram of a battery module provided by an embodiment of the present utility model;

[0027] Figure 5 is an exploded view of a battery module provided by an embodiment of the present utility model.

[0028] In the figure:

[0029] 1, box body;

[0030] 2, battery module; 21, battery cell group; 211, battery cell; 22, connecting tab; 23, battery cell bracket; 231, mounting hole; 232, positioning block; 24, fixing member;

[0031] 3, connecting piece; 31, through hole;

[0032] 4, wiring output member; 41, connecting plate; 42, output plate; 421, lead-out portion; 422, output portion;

[0033] 5, filling and fixing layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

[0037] It should be noted that: like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0039] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "installed" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0041] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0042] This embodiment provides a connecting member that can connect two battery modules arranged side by side. Specifically, as Figure 4 and Figure 5 shown, two battery modules 2 are arranged side by side, and the positive electrode of one battery module 2 faces the negative electrode of the other battery module 2. The connecting member 3 forms two ends that are parallel to each other and have a gap through its own bending, that is, the connecting member 3 is bent into a U-shaped structure after bending. The two ends of the connecting member 3 are respectively connected to the opposite positive and negative electrodes of the two battery modules 2 to connect the two battery modules 2 in series. At the same time, the parallel and spaced arrangement of the two ends of the connecting member 3 can also separate the positive and negative electrodes of the two battery cell modules 2, which helps to reduce the risk of short circuit and ensure the safety of electrical connection.

[0043] This embodiment also provides a battery pack, as Figures 1-5 shown, the battery pack includes the above-mentioned connecting member 3 and two battery modules 2 arranged side by side, and also includes a box body 1, a wiring output member 4 and a filling and fixing layer 5.

[0044] In this embodiment, as Figure 1 and Figure 2 shown, the box body 1 has a cuboid structure and includes a bottom shell and an upper cover (not shown in the figure). The upper cover is snap-connected to the top of the bottom shell to form a box body 1 with a hollow interior. The battery module 2, the connecting member 3, the wiring output member 4 and the filling and fixing layer 5 are all arranged in the box body 1 to protect the internal structure of the battery pack through the box body 1. Of course, in other embodiments, the shape of the box body 1 can be designed according to actual needs and is not limited here.

[0045] Referring to Figure 5, each battery module 2 includes a plurality of battery cell groups 21 with different polarities on the same side, and the plurality of battery cell groups 21 are connected in series end to end in sequence. Specifically, in this embodiment, the battery module 2 includes a plurality of battery cell groups 21 arranged in sequence along a first direction, and the positive and negative electrodes of two adjacent battery cell groups 21 are arranged in opposite directions along a second direction. The positive and negative electrodes of two adjacent battery cell groups 21 are connected in series through a connecting tab 22, and the second direction is perpendicular to the first direction. That is to say, two adjacent battery cell groups 21 with opposite polarities are connected in series through the connecting tab 22, so that the plurality of battery cell groups 21 in each battery module 2 are connected in series to form a "total battery cell", and the positive and negative electrodes of the two battery cell groups 21 located at the ends along the first direction respectively form the positive and negative electrodes of the battery module 2.

[0046] More specifically, in this embodiment, each battery module 2 includes two battery cell groups 21, and the two battery cell groups 21 are arranged side by side and with opposite polarities along the first direction. The connecting tab 22 is parallel to the first direction and is connected to the positive electrode of one battery cell group 21 and the negative electrode of the other battery cell group 21. The negative electrode of the battery cell group 21 not connected to the connecting tab 22 and the positive electrode of the other battery cell group 21 are the negative and positive electrodes of the battery module 2 respectively. It should be noted that the number of battery cell groups 21 in each battery module 2 is not limited and can be determined according to needs, as long as the plurality of battery cell groups 21 in each battery module 2 are connected in series.

[0047] It can be understood that since the square battery cells and soft-pack battery cells have the risk of causing damage to the battery pack due to the expansion force after cycling, which may further lead to the risk of liquid leakage, in this embodiment, the battery cell group 21 is a cylindrical battery cell group. The cylindrical battery cells have good internal resistance consistency and low liquid leakage risk, and are safer and more stable to use.

[0048] In one embodiment, the battery cell group 21 includes a plurality of battery cells 211 arranged in sequence along the first direction, and the length direction of the battery cells 211 is parallel to the second direction. That is to say, the plurality of battery cells 211 in each battery cell group 21 are connected in parallel and have a certain length in the first direction. The plurality of battery cell groups 21 are arranged in sequence along the first direction to form the battery module 2, and this structure is suitable for the case where the battery module 2 is flattened and has a longer length in the first direction.

[0049] In another embodiment, the battery cell group 21 includes a plurality of battery cells 211 arranged in sequence along a third direction, the length direction of the battery cells 211 is parallel to the second direction, and the third direction, the second direction and the first direction are perpendicular to each other in pairs. In this embodiment, the plurality of battery cells 211 in each battery cell group 21 are connected in parallel and have a certain height in the third direction. The plurality of battery cell groups 21 are arranged in sequence along the first direction to form the battery module 2, and this structure is suitable for the case where the battery module 2 has a higher height but a shorter length in the first direction.

[0050] In yet another embodiment, the battery cell group 21 includes a plurality of battery cell columns arranged in sequence along a first direction. Each battery cell column includes a plurality of battery cells 211 arranged in sequence along a third direction. The length direction of the battery cells 211 is parallel to the second direction, and the third direction, the second direction, and the first direction are perpendicular to each other pairwise. In this embodiment, the plurality of battery cells 211 in the battery cell group 21 are arranged in a rectangular array, which can not only parallel more battery cells 211, but also shorten the length of the battery cell group 21 in both the first direction and the third direction, thereby making the structure of the battery module 2 composed of a plurality of battery cell groups 21 more compact. The battery cell group 21 in this embodiment has such a structural design. Specifically, referring to Figure 5 , each battery cell group 21 in this embodiment includes 8 cylindrical battery cells. The 8 cylindrical battery cells are sequentially divided into 4 battery cell columns along the first direction. Each battery cell column includes 2 cylindrical battery cells arranged along the third direction, thereby forming a battery cell group 21 with 8 cylindrical battery cells in parallel.

[0051] Continuing to refer to Figure 4 and Figure 5 , in this embodiment, the connecting member 3 has a planar first state and a second state with both ends folded. When the connecting member 3 is in the first state, two battery modules 2 are arranged side by side along the first direction, and the connecting member 3 is connected to the positive electrode of one battery module 2 and the negative electrode of the other battery module 2. The connecting member 3 can also be folded to switch from the first state to the second state, and make the two connected battery modules 2 arranged side by side along the second direction. By folding the connecting member 3, it is possible to reduce the length of the battery pack in the first direction on the premise of connecting two battery modules 2 in series, making the structure of the battery pack more compact.

[0052] Specifically, first arrange two battery modules 2 side by side along the first direction, and make the positive electrode of one battery module 2 adjacent to the negative electrode of the other battery module 2. Then, connect the adjacent positive and negative electrodes of the two battery modules 2 through the connecting member 3, so that the two battery modules 2 are connected in series and form an integral body in the first direction. Next, fold the connecting member 3, driving the two ends of the battery modules 2 away from each other to rotate towards each other until the connecting member 3 is folded into a U shape, and the two battery modules 2 are arranged side by side in the second direction. At this time, the positive and negative electrodes of the two battery modules 2 connected to the connecting member 3 are facing each other. In this embodiment, first connecting the connecting member 3 to the positive or negative electrode of the battery module 2 and then folding the connecting member 3 can ensure the reliability of the connection between the connecting member 3 and the positive or negative electrode of the battery module 2, and further ensure the stability of the battery operation.

[0053] Optionally, to ensure the integrity of the structure of the battery module 2, such as Figure 4 and Figure 5As shown, the battery module 2 further includes a cell support 23. The two cell supports 23 are parallel to each other and are spaced apart in the second direction. A plurality of mounting holes 231 are formed in the cell support 23. Both ends of the cell group 21 are respectively inserted into a corresponding set of mounting holes 231 on the two cell supports 23. The cell support 23 can position and fix each cell 211 in the cell group 21 to prevent the cell 211 from shifting.

[0054] Further, a positioning block 232 is provided on a side of the cell support 23 facing away from the cell 211. A through hole 31 is formed in the connecting member 3 at a position corresponding to the positioning block 232. The shape of the positioning block 232 matches the shape of the through hole 31 of the connecting member 3. The positioning block 232 can be embedded in the through hole 31 to position the connecting member 3 when the connecting member 3 is welded to the positive or negative electrode of the battery module 2. Still further, the battery module 2 further includes a fixing member 24. The fixing member 24 is arranged parallel to the second direction, and both ends of the fixing member 24 are respectively connected to the two cell supports 23. In this embodiment, the fixing member 24 is a screw rod. Threads are provided at both ends of the screw rod. Threaded holes are respectively formed at opposite positions on the sides of the two cell supports 23. Both ends of the screw rod are respectively threadedly connected to two opposite threaded holes on the two cell supports 23.

[0055] In this embodiment, after two battery modules 2 are connected in series and stacked through the connecting member 3, a wiring output member 4 needs to be provided to transmit the electric energy of the battery module 2. As Figure 1 、 Figure 2 、 Figure 4 and Figure 5 shown, wiring output members 4 are respectively connected to the positive or negative electrodes of the two battery modules 2 that are not connected to the connecting member 3. The wiring output member 4 is connected to the acquisition line to complete the output or input of electric energy.

[0056] Specifically, the wiring output member 4 includes a connecting plate 41. The connecting plate 41 is electrically connected to the positive or negative electrode of the battery module 2 that is not connected to the connecting member 3. An output plate 42 is provided on a side of the connecting plate 41 away from the bottom of the box body 1. The output plate 42 extends and protrudes from the battery module 2 and is connected to the acquisition line. The output plate 42 includes a lead-out portion 421 and an output portion 422 fixedly connected at an angle. The lead-out portion 421 is connected to the connecting plate 41 and extends along the side surface of the battery module 2 in a direction away from the bottom of the box body 1. The output portion 422 extends along the upper surface of the battery module 2. The output portion 422 is connected to the acquisition line.

[0057] In this embodiment, the positive and negative electrodes of the battery module 2 connected to the two connecting plates 41 are arranged opposite to each other, and the output portion 422 extends along the upper surface of the battery module 2 in a direction away from the other battery module 2. When the positive and negative electrodes of the battery module 2 connected to the two connecting plates 41 are arranged back to back, the output portion 422 extends along the upper surface of the battery module 2 in a direction close to the other battery module 2. The extending direction of the output portion 422 needs to be determined according to the relative positions of the positive and negative electrodes of the two battery modules 2, and no limitation is made here.

[0058] As Figure 1 and Figure 2 shown, after the two battery modules 2 are connected, they are placed in the bottom shell of the box body 1, and then the filling and fixing layer 5 is filled and cured in the gap between the box body 1 and the battery module 2. Wrapping and fixing the battery module 2 through the filling and fixing layer 5 can play a role in protection and shock absorption. The filling and fixing layer 5 replaces fixing components such as end plates and fixing plates, and can also effectively reduce the overall weight of the battery pack, which is beneficial to achieving the lightweight goal.

[0059] Optionally, the filling and fixing layer 5 is a foaming glue fixing layer. Specifically, after the two battery modules 2 are placed in the box body 1, foaming glue is injected into the inside of the box body 1, and a flat surface tooling is pressed on the upper part, so that the foaming glue fully flows and expands inside the box body 1 and penetrates into small parts of the components. After the foaming glue is cured, it plays a role in fixing the battery cells 211, the battery cell bracket 23, the connecting bar pieces 22 and the connecting parts 3.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A connecting piece, characterized in that: Used to connect two battery modules (2) arranged side by side, wherein the positive electrode of one of the battery modules (2) is directly opposite to the negative electrode of the other battery module (2); The connecting member (3) is bent by itself to form two ends that are parallel to each other and spaced apart, and the two ends of the connecting member (3) are respectively connected to the positive pole and the negative pole opposite to the two battery modules (2) to connect the two battery modules (2) in series.

2. The connecting piece according to claim 1, characterized in that: Through holes (31) for positioning with the battery cell support (23) of the battery module (2) are provided at intervals on the connecting member (3).

3. A battery pack, characterized in that: It comprises a wiring output component (4), two battery modules (2) arranged side by side, and a connecting component (3) as claimed in claim 1 or 2, each of the battery modules (2) comprises a plurality of battery cell groups (21) with different polarities on the same side, and the plurality of battery cell groups (21) are sequentially connected end to end in series, the two battery cell groups (21) facing each other at the ends of the same side of the two battery modules (2) are connected in series via the connecting component (3), and the two battery cell groups (21) at the ends of the other sides of the two battery modules (2) are respectively connected to the wiring output component (4).

4. The battery pack according to claim 3, characterized in that: It also includes a connecting bar (22), and the multiple battery cell groups (21) in each battery module (2) are connected in series via the connecting bar (22).

5. The battery pack according to claim 3 or 4, characterized in that: Each of the battery cell groups (21) comprises a plurality of battery cells (211) with the same polarity on the same side, the length direction of the battery cells (211) is parallel to the second direction, and the plurality of battery cells (211) are arranged in sequence along the first direction; and / or, The plurality of battery cells (211) are arranged in sequence along a third direction, and the third direction, the second direction and the first direction are perpendicular to each other.

6. The battery pack according to claim 3, characterized in that: It also comprises a box body (1) and a filling and fixing layer (5), wherein the two battery modules (2) are arranged side by side in the box body (1) along the second direction, and the filling and fixing layer (5) is arranged in the gap between the box body (1) and the battery modules (2), and the filling and fixing layer (5) is a foamed rubber fixing layer.

7. The battery pack according to claim 5, characterized in that: The battery module (2) comprises two battery cell supports (23), the two battery cell supports (23) are parallel to each other and spaced apart along a second direction, a plurality of mounting holes (231) are provided on the battery cell supports (23), and two ends of the battery cell (211) are respectively inserted into a corresponding group of mounting holes (231) on the two battery cell supports (23).

8. The battery pack according to claim 7, characterized in that: A positioning block (232) is provided on the side of the battery cell support (23) facing away from the battery cell (211); the shape of the positioning block (232) matches the shape of the through hole (31) of the connecting member (3); and the through hole (31) is sleeved outside the positioning block (232).

9. The battery pack according to claim 8, characterized in that: The battery module (2) further comprises a fixing member (24), wherein the fixing member (24) is arranged parallel to the second direction, and the two ends of the fixing member (24) are respectively connected to the two battery cell brackets (23).

10. The battery pack according to claim 6, characterized in that: The wiring output member (4) comprises a connecting plate (41), the connecting plate (41) being conductively connected to a positive electrode or a negative electrode of the battery module (2) that is not connected to the connecting member (3), and an output plate (42) is provided on a side of the connecting plate (41) away from the bottom of the box (1), the output plate (42) extending to protrude from the battery module (2) and connected to a collection line.

11. The battery pack according to claim 10, characterized in that: The output plate (42) comprises a lead-out portion (421) and an output portion (422) which are fixedly connected at an angle, the lead-out portion (421) being connected to the connection plate (41) and extending along the side of the battery module (2) in a direction away from the bottom of the box body (1), the output portion (422) extending along the upper surface of the battery module (2), and the output portion (422) being connected to the collection line.

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