Battery pack

Abstract

The utility model relates to a kind of battery pack in power battery technical field.It includes: box;Electricity core stack, electricity core stack includes multiple soft package electric core with tab, electricity core stack is installed in box;Heat-conducting structural glue, electricity core stack and the bottom plate of box are fixed by heat-conducting structural glue bonding;Foaming glue, foaming glue is filled between the tab side of electricity core stack and box;Flexible circuit board assembly, flexible circuit board assembly includes flexible circuit board and insulating clamping component, flexible circuit board is fixed by the tab of the tab side of electricity core stack with insulating clamping component clamping.It is fixed by the tab of the tab side of electricity core stack with insulating clamping component clamping to realize the limiting of flexible circuit board assembly, and structure and process flow are simplified, space utilization is high, not only reduce the difficulty of flexible circuit board assembly positioning installation, and connection is reliable, structure is stable, not easy to fail, it is favorable to promote the energy density and product performance of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery pack. Background Technology

[0002] Existing battery packs mostly use flexible circuit boards to achieve functions such as cell temperature acquisition and voltage detection. The positioning and fixation of flexible circuit boards mainly rely on plastic parts, which are fixed to the plastic parts by adhesive, thermal riveting, or welding. However, these fixing methods have certain drawbacks. For example, adhesive failure over time can cause the flexible circuit board to shift or fall off; thermal riveting requires the investment of thermal riveting equipment on the production line, increasing costs, and the long-term stability and reliability of this process have not been verified in actual use; before the sampling pads on the flexible circuit board are welded to the tabs, the tabs need to be fixed to the plastic parts first, which not only increases costs but also introduces uncertainty in welding strength. If the welding fails, it will affect the sampling function of the flexible circuit board. Utility Model Content

[0003] This utility model provides a battery pack that solves the technical problems of difficulty in fixing the position of flexible circuit boards and poor structural stability, thereby improving the energy density and product performance of the battery pack.

[0004] To achieve the above and other related objectives, this utility model provides a battery pack, comprising: Box; A battery cell stack comprising a plurality of pouch cells with tabs, the battery cell stack being mounted inside the housing; Thermally conductive structural adhesive is used to directly bond and fix the battery cell stack to the bottom plate of the housing. Expanding foam, which fills and connects the tab side of the cell stack to the housing; A flexible circuit board assembly, comprising a flexible circuit board and an insulating snap-fit ​​component, wherein the insulating snap-fit ​​component is fixedly connected to the flexible circuit board assembly, and the flexible circuit board is snapped and fixed to the tab side of the battery cell stack via the insulating snap-fit ​​component.

[0005] In one embodiment of the present invention, the tabs of a plurality of pouch cells located on the same side of the cell stack are bent toward each other and at least partially stacked and connected to form a tab overlap portion. In the height direction of the cell stack, the insulating snap-fit ​​component is adapted to move from top to bottom and be positioned and snapped into the upper part of the tab overlap portion.

[0006] In one embodiment of the present invention, the insulating snap-fit ​​component includes a first snap-fit ​​member, the first snap-fit ​​member including a first support piece, the first support piece having a first side facing the flexible circuit board and a second side facing away from the flexible circuit board, the first side of the first support piece being connected and fixed to the flexible circuit board, a portion of the top of the first support piece being bent downward to form a plurality of first clips, the first clips being arranged opposite to the second side of the first support piece, the first clips cooperating with the first support piece and clamping the corresponding electrode overlap portion.

[0007] In one embodiment of the present invention, a portion of the first support piece protrudes toward the first clamping piece to form a first raised portion, and the first raised portion is arranged opposite to the first clamping piece so that the overlapping portion of the electrode tab is clamped between the first raised portion and the first clamping piece.

[0008] In one embodiment of the present invention, the first support piece extends along the length direction of the flexible circuit board and is bonded and fixed to the flexible circuit board. There are multiple first clips, which are distributed at intervals along the extension direction of the first support piece and respectively engage with the corresponding overlapping part of the tab.

[0009] In one embodiment of the present invention, the insulating snap-fit ​​component includes an insulating reinforcing sheet and a second snap-fit ​​member. The insulating reinforcing sheet is connected and fixed to the flexible circuit board, and the second snap-fit ​​member is connected and fixed to the insulating reinforcing sheet and snaps into the overlapping portion of the electrode tab.

[0010] In one embodiment of the present invention, the insulating reinforcing sheet extends along the length direction of the flexible circuit board and is bonded and fixed to the flexible circuit board. The number of the second snap-fit ​​pieces is multiple. The multiple second snap-fit ​​pieces are distributed at intervals along the extension direction of the insulating reinforcing sheet and are bonded and fixed to the insulating reinforcing sheet. Each second snap-fit ​​piece corresponds to and snaps into one or more of the overlapping portions of the tabs.

[0011] In one embodiment of the present invention, the second snap-fit ​​member includes a second support piece, the second support piece having a first side facing the insulating reinforcing piece and a second side facing away from the insulating reinforcing piece, the first side of the second support piece being bonded and fixed to the insulating reinforcing piece, a portion of the top of the second support piece being bent downward to form one or more second clips, the second clips being arranged opposite to the second side of the second support piece, the second clips cooperating with the second support piece and clamping the corresponding electrode overlap portion.

[0012] In one embodiment of the present invention, a portion of the second support piece protrudes toward the second clamping piece to form a second protrusion, the second protrusion being arranged opposite to the second clamping piece so that the overlapping portion of the electrode tab is clamped between the second protrusion and the second clamping piece.

[0013] In one embodiment of the present invention, the flexible circuit board includes a flexible circuit board body, on which a plurality of sampling pieces are provided, distributed along the stacking direction of the soft-pack battery cells. The sampling pieces are adapted to be aligned with and welded to the electrode corresponding to the sampling pieces when the insulating snap-fit ​​component and the electrode overlap portion are snapped into place.

[0014] The beneficial effects of this utility model are as follows: The battery pack proposed in this utility model achieves the limiting of the flexible circuit board assembly by fixing the electrode tabs of the cell stack with the insulating snap-fit ​​component, which simplifies the structure and process flow, and has a high space utilization rate. It not only reduces the difficulty of positioning and installing the flexible circuit board assembly, but also ensures reliable connection, stable structure, and less susceptibility to failure, which is conducive to improving the energy density and product performance of the battery pack. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1 This is an exploded view of the battery pack provided in Embodiment 1 of this utility model; Figure 2 An exploded view of a partial structure of the battery pack provided in Embodiment 2 of this utility model; Figure 3 for Figure 2 Exploded view of the flexible circuit board assembly; Figure 4 for Figure 3 A schematic diagram of the structure of the second connector in the middle; Figure 5 for Figure 2 A schematic diagram of the structure when the flexible circuit board assembly is connected to the battery cell stack; Figure 6 for Figure 5 A magnified schematic diagram of part A in the middle; Figure 7 for Figure 6 Sectional view at point BB; Figure 8This is a partial structural schematic diagram of the battery pack provided in Embodiment 3 of this utility model; Figure 9 for Figure 8 A magnified schematic diagram of part C in the middle; Figure 10 for Figure 9 Sectional view at point DD; Figure 11 for Figure 9 A schematic diagram of the structure of the second connector in the middle; Figure 12 A partial structural diagram of the battery pack provided in Embodiment 4 of this utility model; Figure 13 for Figure 12 A schematic diagram of the structure of the first card connector in the middle; Figure 14 for Figure 13 A magnified schematic diagram of a local part of F; Figure 15 for Figure 12 A magnified schematic diagram of part E in the middle; Figure 16 for Figure 15 Sectional view at point GG.

[0017] The attached figures are labeled as follows: 1. Housing, 2. Cell stack, 21. Soft-pack cell, 211. Electrode, 22. Electrode overlap, 3. Foam, 4. Flexible circuit board assembly, 41. Insulating snap-fit ​​component, 411. First snap-fit ​​component, 4111. First support piece, 4112. First clamping piece, 4113. Insulating reinforcement piece, 412. Second snap-fit ​​component, 4131. Second support piece, 4132. Second clamping piece, 4133. Flexible circuit board, 421. Flexible circuit board body, 422. Sampling piece, 5. Housing cover. Detailed Implementation

[0018] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0021] Please see Figure 1 , Figure 2 , Figure 5 , Figure 8 and Figure 12 In some optional embodiments, the present invention provides a battery pack, which includes a housing 1, a cell stack 2, a thermally conductive structural adhesive, a foam adhesive 3, and a flexible circuit board assembly 4; in addition to the above-mentioned components, the battery pack may also include a cover 5. The housing 1 has a bottom plate and a box opening opposite to the bottom plate. The cell stack 2 includes a plurality of stacked soft-pack cells 21 with tabs 211 and two opposite tab sides. The tabs 211 of the soft-pack cells 21 are located on the tab sides of the cell stack 2. The cell stack 2 is adapted to be inserted into the housing 1 from the box opening and installed inside the housing 1. The cover 5 is distributed along the height direction of the cell stack 2 with the housing 1. The cover 5 is located above the cell stack 2 and seals the box opening to encapsulate the cell stack 2 inside the housing 1. The cell stack 2 is bonded and fixed to the base plate of the housing 1 using thermally conductive structural adhesive. Specifically, the cell stack 2 and the base plate of the housing 1 can be directly bonded and fixed using thermally conductive structural adhesive. Foam 3 fills and connects the tab side of the cell stack 2 to the housing 1. The flexible circuit board assembly 4 includes a flexible circuit board 42 and an insulating snap-fit ​​component 41. The insulating snap-fit ​​component 41 is fixedly connected to the flexible circuit board assembly 4, and the flexible circuit board 42 is snapped and fixed to the tab 211 on the tab side of the cell stack 2 through the insulating snap-fit ​​component 41.

[0022] Optionally, in the length direction of the soft-pack battery cell 21, both ends of the soft-pack battery cell 21 are provided with tabs 211. The tabs 211 of multiple soft-pack battery cells 21 located on the same side of the battery cell stack 2 are bent towards each other and at least partially overlapped and connected to form a tab overlap portion 22. That is, the tab overlap portion 22 can be formed by two or more tabs 211 overlapping and fixedly connected. The tabs 211 between the soft-pack battery cells 21 are stacked and electrically connected to realize the series and parallel connection between the soft-pack battery cells 21. In the height direction of the battery cell stack 2, the insulating snap-fit ​​component 41 is adapted to move from top to bottom and be positioned and snap-fitted to the upper part of the tab overlap portion 22. When the insulating snap-fit ​​component 41 is snapped into place, the flexible circuit board assembly 4 is positioned and fixed in the height direction of the battery cell stack 2. Furthermore, one end of the pouch cell 21 has a copper tab 211, and the other end has an aluminum tab 211. The copper tabs and aluminum tabs of two adjacent pouch cells 21 located on the same side of the cell stack 2 are stacked and directly welded to achieve electrical connection between the pouch cells 21, thereby realizing series connection between the pouch cells 21, which helps to simplify the structure.

[0023] Optionally, the flexible circuit board 42 includes a flexible circuit board body 421. The flexible circuit board body 421 has multiple sampling pieces 422 distributed along the stacking direction of the pouch cells 21. The sampling pieces 422 are adapted to align with and be soldered to the corresponding tabs 211 when the insulating snap-fit ​​component 41 is engaged with the tab overlap portion 22. The sampling pieces 422 include nickel sheets, which are electrically connected to the tabs 211 of the pouch cells 21 for sampling. Further, in the height direction of the cell stack 2, the insulating snap-fit ​​component 41 is located at the upper part of the flexible circuit board body 421, and the sampling pieces 422 are located at the lower part of the flexible circuit board body 421. The flexible circuit board 42 is snapped onto the tab overlap portion 22 by the insulating snap-fit ​​component 41. After the sampling pieces 422 are in place, they can be aligned with the corresponding tabs 211, which helps to ensure that the multiple sampling pieces 422 are at the same height in the height direction of the cell stack 2, facilitating soldering between the sampling pieces 422 and the tabs 211.

[0024] It should be noted that in this utility model, the length direction of the cell stack 2, the distribution direction of the two tab sides of the cell stack 2, and the length direction of the pouch cell 21 are the same, i.e., the X direction in the figure; the width direction of the cell stack 2, the stacking direction of multiple pouch cells 21 in the same cell stack 2, and the thickness direction of the pouch cell 21 are the same, i.e., the Y direction in the figure; the height direction of the cell stack 2 and the height direction of the pouch cell 21 are the same, i.e., the Z direction in the figure.

[0025] In the battery pack of the above embodiment, the flexible circuit board assembly 4 is fixed to the tab 211 on the tab side of the cell stack 2 by the insulating snap-fit ​​component 41. This not only limits the position of the flexible circuit board assembly 4, but also simplifies installation and ensures a stable and reliable structure. In particular, compared with hot riveting, snap-fit ​​fixing is simple to operate and low in cost. Compared with adhesive fixing, snap-fit ​​fixing is less prone to failure. In addition, the flexible circuit board assembly 4 is fixedly installed on the tab 211, eliminating the need for additional plastic parts to provide installation support for the flexible circuit board assembly 4. This simplifies the structure, improves space utilization, and thus helps to improve the energy density and product performance of the battery pack. Furthermore, it does not obstruct the upper part of the tab side of the cell stack 2, making it convenient to operate and observe when potting glue in the tab 211 area.

[0026] See Figures 12 to 16 In some optional embodiments, the insulating snap-fit ​​component 41 includes a first snap-fit ​​member 411, which includes a first support piece 4111. The first support piece 4111 has a first side facing the flexible circuit board 42 and a second side facing away from the flexible circuit board 42. The first side of the first support piece 4111 is connected and fixed to the flexible circuit board 42. A portion of the top of the first support piece 4111 is bent downward to form a plurality of first clips 4112. The plurality of first clips 4112 are arranged facing the second side of the first support piece 4111. The first clips 4112 cooperate with the first support piece 4111 and clamp the corresponding tab overlap portion 22.

[0027] Optionally, a portion of the first support piece 4111 protrudes towards the first clamping piece 4112 to form a first raised portion 4113. The first raised portion 4113 and the first clamping piece 4112 are arranged opposite each other so that the electrode overlap portion 22 is clamped between the first raised portion 4113 and the first clamping piece 4112. Further, the gap width between the first raised portion 4113 and the first clamping piece 4112 is less than or equal to the thickness of the electrode overlap portion 22, so that the first raised portion 4113 and the first clamping piece 4112 can fully clamp the electrode overlap portion 22, preventing loosening and improving the reliability and stability of the connection between the insulating snap-fit ​​component 41 and the electrode overlap portion 22. When the gap width between the first raised portion 4113 and the first clamping piece 4112 is less than the thickness of the electrode overlap portion 22, the insulating snap-fit ​​component 41 and the electrode overlap portion 22 can be an interference fit.

[0028] Optionally, the first support piece 4111 extends along the length of the flexible circuit board 42 and is bonded and fixed to the flexible circuit board 42. The first support piece 4111 can support the flexible circuit board 42, which helps to improve the structural strength of the flexible circuit board 42. Multiple first clips 4112 are distributed at intervals along the extension direction of the first support piece 4111, or in other words, multiple first clips 4112 are distributed at intervals along the stacking direction of multiple soft-pack cells 21 of the cell stack 2. The multiple first clips 4112 are respectively engaged with the corresponding electrode overlap portion 22.

[0029] Optionally, the first raised portion 4113 extends continuously along the stacking direction of the multiple soft-pack cells 21, so that the first raised portion 4113 can cover all the tabs 211 on the tab side of the corresponding cell stack 2, and the first raised portion 4113 is in contact with the surface of all the tab overlap portions 22 on the same tab side of the cell stack 2. Multiple spaced first clips 4112 are engaged with some of the tab overlap portions 22 on the same tab side of the cell stack 2, which not only ensures the stability of the engagement, but also helps to reduce the amount of material used.

[0030] Optionally, the first connector 411 may include a PC (polycarbonate) component, a PET (polyethylene terephthalate) component, or other rigid components made of plastic, which can provide reliable support for the flexible circuit board 42.

[0031] The battery pack of the above embodiment has a simple structure for the insulating snap-fit ​​component 41. The first support piece 4111 and the first clamp piece 4112 are an integral structure, which is simple to manufacture and has low cost.

[0032] See Figures 2 to 11 In some alternative embodiments, the insulating snap-fit ​​component 41 includes an insulating reinforcing sheet 412 and a second snap-fit ​​component 413. The insulating reinforcing sheet 412 is connected and fixed to the flexible circuit board 42, and the second snap-fit ​​component 413 is connected and fixed to the insulating reinforcing sheet 412 and snaps into the electrode overlap portion 22.

[0033] Optionally, the insulating reinforcing sheet 412 extends along the length of the flexible circuit board 42 and is bonded and fixed to the flexible circuit board 42. The extending direction of the insulating reinforcing sheet 412, the length direction of the flexible circuit board 42, and the stacking direction of the plurality of soft-pack cells 21 in the cell stack 2 are the same. The insulating reinforcing sheet 412 at least covers the portion of the flexible circuit board 42 corresponding to the tab side of the cell stack 2. The insulating reinforcing sheet 412 can strengthen the support of the flexible circuit board 42, which is beneficial to improving the structural strength of the flexible circuit board 42.

[0034] Optionally, the insulating reinforcement sheet 412 may include a rigid sheet of PC, PET or other plastic material, which can provide reliable support for the flexible circuit board 42.

[0035] Optionally, there may be multiple second snap-fit ​​pieces 413. These multiple second snap-fit ​​pieces 413 are distributed at intervals along the extension direction of the insulating reinforcing sheet 412 and are bonded and fixed to the insulating reinforcing sheet 412. Providing multiple second snap-fit ​​pieces 413 is beneficial to improving the snap-fit ​​stability with the battery cell stack 2.

[0036] Optionally, the second snap-fit ​​member 413 includes a second support piece 4131, which has a first side facing the insulating reinforcing piece 412 and a second side facing away from the insulating reinforcing piece 412. The first side of the second support piece 4131 is bonded and fixed to the insulating reinforcing piece 412. A portion of the top of the second support piece 4131 is bent downward to form a second clip 4132. The second clip 4132 is arranged opposite to the second side of the second support piece 4131. The second clip 4132 cooperates with the second support piece 4131 and clamps the corresponding electrode overlap portion 22.

[0037] Optionally, a portion of the second support piece 4131 protrudes towards the second clamping piece 4132 to form a second raised portion 4133. The second raised portion 4133 and the second clamping piece 4132 are arranged opposite each other so that the overlapping tab 22 is clamped between the second raised portion 4133 and the second clamping piece 4132. Further, the gap width between the second raised portion 4133 and the second clamping piece 4132 is less than or equal to the thickness of the overlapping tab 22, so that the second raised portion 4133 and the second clamping piece 4132 can fully clamp the overlapping tab 22, preventing loosening and improving the reliability and stability of the connection between the insulating snap-fit ​​component 41 and the overlapping tab 22. When the gap width between the second raised portion 4133 and the second clamping piece 4132 is less than the thickness of the overlapping tab 22, the second snap-fit ​​component 413 and the overlapping tab 22 can be an interference fit.

[0038] In the battery pack of the above embodiment, the insulating reinforcing sheet 412 and the second snap-fit ​​member 413 of the insulating snap-fit ​​member 41 are separate structures. The insulating reinforcing sheet 412 and the second snap-fit ​​member 413 can be processed separately, which is more flexible, helps to reduce the processing difficulty, and thus helps to reduce costs.

[0039] See Figures 8 to 11 In some alternative embodiments, each second snap-fit ​​413 corresponds to and snaps into a tab overlap 22.

[0040] Optionally, a portion of the top of the second support piece 4131 is bent downward to form a second clamping piece 4132. The second clamping piece 4132 is arranged opposite to the second side of the second support piece 4131. The second clamping piece 4132 cooperates with the second support piece 4131 and clamps the corresponding tab overlap portion 22.

[0041] The battery pack of the above embodiment has a simple structure for the second connector 413, which is easy to manufacture and process, and helps to reduce the complexity of the processing mold, thereby helping to reduce costs.

[0042] See Figures 2 to 7 In some alternative embodiments, each second snap-fit ​​413 corresponds to and snaps into a plurality of tab overlaps 22.

[0043] Optionally, a portion of the top of the second support piece 4131 is bent downwards to form multiple second clips 4132. The second clips 4132 are arranged opposite to the second side of the second support piece 4131, and they engage with the second support piece 4131 to clamp the corresponding electrode overlap portion 22. Further, each second snap-fit ​​member 413 corresponds to and snaps into two adjacent electrode overlap portions 22. That is, a portion of the top of the second support piece 4131 of each second snap-fit ​​member 413 is bent downwards to form two second clips 4132. It is understood that the number of second clips 4132 in each second snap-fit ​​member 413 is not limited to the two listed; the number of second clips 4132 can be set according to requirements.

[0044] In the battery pack of the above embodiment, the second snap-fit ​​member 413 snaps into the overlapping portions 22 of the multiple tabs, which helps to ensure the stability of the snap-fit.

[0045] In this utility model, the flexible circuit board assembly 4 is directly engaged and fixed to the tab 211 on the tab side of the cell stack 2 through the insulating snap-fit ​​component 41. This allows the flexible circuit board assembly 4 to be fixedly positioned on the tab 211 of the cell stack 2, thereby achieving the positioning and fixation of the flexible circuit board assembly 4. This simplifies the structure, makes assembly simple, ensures structural stability, and improves the energy density and product performance of the battery pack.

[0046] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: Box; A battery cell stack comprising a plurality of pouch cells with tabs, the battery cell stack being mounted inside the housing; Thermally conductive structural adhesive is used to directly bond and fix the battery cell stack to the bottom plate of the housing. Expanding foam, which fills and connects the tab side of the cell stack to the housing; A flexible circuit board assembly, comprising a flexible circuit board and an insulating snap-fit ​​component, wherein the insulating snap-fit ​​component is fixedly connected to the flexible circuit board assembly, and the flexible circuit board is snapped and fixed to the tab side of the battery cell stack via the insulating snap-fit ​​component.

2. The battery pack according to claim 1, characterized in that, The tabs of multiple pouch cells located on the same side of the cell stack are bent toward each other and at least partially stacked to form a tab overlap. In the height direction of the cell stack, the insulating snap-fit ​​component is adapted to move from top to bottom and be positioned and snapped into the upper part of the tab overlap.

3. The battery pack according to claim 2, characterized in that, The insulating snap-fit ​​component includes a first snap-fit ​​member, which includes a first support piece. The first support piece has a first side facing the flexible circuit board and a second side facing away from the flexible circuit board. The first side of the first support piece is connected and fixed to the flexible circuit board. A portion of the top of the first support piece is bent downward to form a plurality of first clips. The first clips are arranged opposite to the second side of the first support piece. The first clips cooperate with the first support piece and clamp the corresponding electrode overlap portion.

4. The battery pack according to claim 3, characterized in that, A portion of the first support piece protrudes toward the first clamping piece to form a first raised portion, which is arranged opposite to the first clamping piece so that the overlapping portion of the electrode tab is clamped between the first raised portion and the first clamping piece.

5. The battery pack according to claim 3, characterized in that, The first support piece extends along the length of the flexible circuit board and is bonded and fixed to the flexible circuit board. There are multiple first clips, which are distributed at intervals along the extension direction of the first support piece and respectively engage with the corresponding overlapping part of the tab.

6. The battery pack according to claim 2, characterized in that, The insulating snap-fit ​​component includes an insulating reinforcing sheet and a second snap-fit ​​member. The insulating reinforcing sheet is connected and fixed to the flexible circuit board, and the second snap-fit ​​member is connected and fixed to the insulating reinforcing sheet and snaps into the overlapping portion of the electrode tab.

7. The battery pack according to claim 6, characterized in that, The insulating reinforcing sheet extends along the length of the flexible circuit board and is bonded and fixed to the flexible circuit board. There are multiple second snap-fit ​​pieces, which are distributed at intervals along the extension direction of the insulating reinforcing sheet and are bonded and fixed to the insulating reinforcing sheet. Each second snap-fit ​​piece corresponds to and snaps into one or more of the overlapping portions of the tabs.

8. The battery pack according to claim 7, characterized in that, The second snap-fit ​​member includes a second support piece having a first side facing the insulating reinforcing sheet and a second side facing away from the insulating reinforcing sheet. The first side of the second support piece is bonded and fixed to the insulating reinforcing sheet. A portion of the top of the second support piece is bent downward to form one or more second clips. The second clips are arranged opposite to the second side of the second support piece. The second clips cooperate with the second support piece and clamp the corresponding electrode overlap portion.

9. The battery pack according to claim 8, characterized in that, A portion of the second support piece protrudes toward the second clamping piece to form a second raised portion, which is arranged opposite to the second clamping piece so that the overlapping portion of the electrode tab is clamped between the second raised portion and the second clamping piece.

10. The battery pack according to claim 2, characterized in that, The flexible circuit board includes a flexible circuit board body, on which a plurality of sampling pieces are provided, distributed along the stacking direction of the soft-pack battery cells. The sampling pieces are adapted to be aligned with and welded to the electrode corresponding to the sampling pieces when the insulating snap-fit ​​component and the electrode overlap portion are snapped into place.

Images