Battery packs and electronic devices

Abstract

The utility model relates to the field of batteries, and specifically to a battery pack and an electronic device. The battery pack includes a box body; a battery cell stack formed by stacking a plurality of soft-pack battery cells and arranged in the box body; an electrode lead-out portion led out from the soft-pack battery cell; a heat-conducting structural adhesive bonded between the battery cell stack body and the box body; a side plate arranged at the end of the stacking direction of the soft-pack battery cell; an output pole piece fixedly arranged at at least one end of the side plate in a form corresponding to the electrode lead-out portion; and the output pole piece and the electrode lead-out portion are welded and fixedly arranged. On the one hand, the side plate can be fully utilized to provide a pre-tightening force from the end of the battery cell stack body to install and protect the battery cell stack body, and on the other hand, the output pole piece fixed at the end of the side plate can be electrically connected and fixed to the electrode lead-out portion without the need to separately set up a fixing structure for the output pole piece, thereby improving the degree of integration and space utilization, and facilitating automated installation.

Description

Technical Field

[0001] The utility model relates to the field of power batteries, and in particular to a battery pack and an electronic device having the battery pack. Background Art

[0002] In electric vehicles or energy storage systems that require large capacity and high voltage output, it is usually necessary to connect multiple battery cells in series and / or in parallel to form a battery module, and then connect the battery modules in series and / or in parallel to form a battery pack, and further use the battery pack as an energy system for powering electric vehicles or as an energy storage system. As a solution to improve energy density, the CTP (cell to pack) type battery pack omits the step of forming battery modules from battery cells, and directly integrates the battery cells into a battery pack, thereby eliminating the structural parts and electrical connectors required to form the battery module, so that the space left for the battery cells themselves can be increased.

[0003] At present, common battery cells are divided into cylindrical cells, square shell cells and soft pack cells according to their structures. CTP battery packs using square shell cells have been widely promoted and used, but soft pack cells still face a series of problems in the process of integration into CTP battery packs because they are not easy to withstand external impacts and have poor assembly. In the prior art, it is necessary to set a fixed structure for the output pole piece separately, which occupies more space in the battery pack, affecting the space utilization and the energy density of the battery pack. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a battery pack having a higher space utilization rate and a higher energy density.

[0005] To achieve the above-mentioned purpose and other related purposes, the first aspect of the utility model provides a battery pack, including a case body; a battery cell stack formed by stacking a plurality of soft-pack battery cells and arranged in the case body; electrode lead-out parts led out from the soft-pack battery cells, at least part of the electrode lead-out parts of two adjacent soft-pack battery cells are directly overlapped and welded and fixed; a thermally conductive structural adhesive directly bonded between the battery cell stack body and the case body; a side panel arranged at the end of the stacking direction of the soft-pack battery cells; an output pole tab fixedly arranged at at least one end of the side panel in a form corresponding to the electrode lead-out part; part of the electrode lead-out part is formed as an output pole lead-out part, and the output pole tab is welded and fixed to the output pole lead-out part.

[0006] According to the battery pack provided by the first aspect of the utility model, the output pole lead-out part led out from the soft-pack battery cell is welded and fixed to the output pole bar piece fixed at the end of the side plate. On the one hand, the side plate can be fully utilized to provide a pre-tightening force from the end of the battery cell stack to install and protect the battery cell stack. On the other hand, the output pole bar piece fixed at the end of the side plate can be electrically connected and fixed to the electrode lead-out part without the need to separately set up a fixing structure for the output pole bar piece. Therefore, the degree of integration and space utilization are improved, which is conducive to automated installation.

[0007] As the battery pack of the preferred technical solution of the utility model, the end of the side plate has a fixed end wall in the length extension direction of the soft-pack battery cell. The output pole piece is fixed on the fixed end wall, and at least one output pole lead-out portion close to the side plate is bent and overlapped and fixed on the output pole piece.

[0008] According to the preferred technical solution, by setting a fixed end wall for fixing the output pole piece at the end of the side panel, and bending the output pole lead portion close to the side panel and then overlapping and fixing it to the output pole piece, the output pole piece can be installed at the same time as the side panel is installed, which simplifies the installation process and can complete the electrical connection between the output pole lead portion and the output pole piece in a short distance without taking up too much space.

[0009] As the preferred technical solution of the battery pack of the utility model, the two output pole pieces are located on the same side of the battery stack in the length extension direction of the soft-pack battery cells, and the two output pole pieces are respectively fixed on two side panels on both sides of the stacking direction of the soft-pack battery cells in the battery stack.

[0010] According to the preferred technical solution, the two output pole pieces are respectively installed on the two side panels and are located on the same side of the battery cell stack. Such an output pole piece structure is conducive to adjacent connection with the output positive and negative electrodes of other adjacent battery cell stacks. The compact structure reduces the electrical connection length and the internal insulation protection requirements of the battery pack, while also improving the volume utilization of the battery pack.

[0011] In the battery pack as the preferred technical solution of the utility model, the two output pole pieces are located on the same side of the battery cell stack, and the two output pole pieces are fixed on the same side plate on the same side of the battery cell stack.

[0012] According to the preferred technical solution, the structure in which the two output pole pieces are located at the same end of the same side plate makes it easy to assemble and electrically connect the two output pole pieces when they are used as the external total output pole of the battery pack.

[0013] As the battery pack of the preferred technical solution of the present utility model, the fixed end wall also has a step fixing portion, and the two output pole pieces are respectively fixed on the step fixing portion.

[0014] According to the preferred technical solution, the two output pole pieces are respectively fixed at different positions of the step fixing portion, so that the output pole pieces can be arranged in a staggered manner to ensure the safety of electrical insulation.

[0015] As the battery pack of the preferred technical solution of the utility model, the step fixing portion also has two fixed walls, the two fixed walls are staggered in the length extension direction of the soft-pack battery cell, and the two output pole pieces are respectively fixed on the two fixed walls, so that the two output pole pieces are staggered with each other in the length extension direction of the soft-pack battery cell.

[0016] According to the preferred technical solution, the two output pole pieces are staggered with each other in the length extension direction of the soft-pack battery cell, thereby ensuring the electrical insulation performance between the two output pole pieces.

[0017] As the battery pack of the preferred technical solution of the utility model, the top of the output pole piece is constructed as an external output part, and the external output parts of the two output pole pieces are staggered in the height extension direction of the soft-pack battery cell.

[0018] According to the preferred technical solution, the external output parts of the two output pole pieces are staggered in the height extension direction of the soft-pack battery cell, so as to achieve electrical insulation between the external output parts of the two output pole pieces.

[0019] As the battery pack of the preferred technical solution of the utility model, a avoidance hole for the output pole lead-out part to pass through is also provided on the step fixing part, the avoidance hole is located between the two fixed walls, and at least one output pole lead-out part is suitable for passing through the avoidance hole to be fixed to the output pole bar.

[0020] According to the preferred technical solution, an output pole lead-out portion is led out through a avoidance hole arranged on the step fixing portion and fixedly connected to the output pole bar. Through a compact integrated structure, the two electrode lead-out portions can be fixed separately to the two output pole bars arranged on the same side of the side plate without interfering with each other.

[0021] As the battery pack of the preferred technical solution of the utility model, the box body also includes a beam structure, the soft-pack battery cell includes a main body and an electrode lead-out portion arranged at least at one end of the main body close to the beam structure, and foam glue is filled between the beam structure, the main body and the electrode lead-out portion.

[0022] According to the preferred technical solution, the foamed glue is filled between the beam structure, the main body and the electrode lead-out part, which can fix the battery cell stack and increase the rigidity and strength of the battery pack. On the other hand, it can isolate the adjacent electrode lead-out parts to achieve electrical insulation between the electrode lead-out parts and between the electrode lead-out parts and the box body. At the same time, it can also reduce the risk of heat transfer between different soft-pack battery cells during thermal runaway.

[0023] The second aspect of the present invention further provides an electronic device having the battery pack provided by the first aspect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structural explosion of the battery pack in some embodiments of the present invention.

[0025] Figure 2 It is a schematic diagram of the structure of a battery cell stack in some embodiments of the present invention.

[0026] Figure 3 It is a schematic structural diagram of the side plate in the first embodiment of the utility model.

[0027] Figure 4 It is a schematic three-dimensional diagram of the partial structure of the end portion of the side plate in the first embodiment.

[0028] Figure 5 It is a schematic perspective view of the structure of the end portion of the side plate in the second embodiment.

[0029] Figure 6 It is a partial schematic diagram of the end portion of the side plate in the second embodiment.

[0030] Figure 7 It is a partially enlarged side view of the output pole piece in the third embodiment.

[0031] Figure 8 for Figure 7 Schematic diagram of the cross section at CC.

[0032] Fig. 9 It is a partial schematic diagram of the end of the soft-pack battery cell in the fourth embodiment.

[0033] Fig.10 This is a schematic diagram of a cell stack according to a fifth embodiment.

[0034] Reference numerals:

[0035] 100-battery pack; 1-box; 10-installation space; 101-first installation space; 102-second installation space; 11-top plate; 12-lower shell; 120-bottom plate of lower shell; 121-beam structure; 122-side beam; 123-middle beam; 2-cell stack; 20-soft-pack battery cell; 201-main body; 202-electrode lead-out part; 202a-output pole lead-out part; 202b-output pole lead-out part; 21-side panel; 211-fixed end wall; 22-output pole piece; 221-external output part; 22a-first output pole piece; 22b-second output pole piece; 23-step fixing part; 231-first fixed wall; 232-second fixed wall; 24-avoidance hole; 25-foaming glue. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] <Terms and Explanations>

[0038] The term "electronic device" in the present disclosure should be understood in a broad sense, and may refer not only to computers, mobile phones, PDAs, etc., but also to electricity-consuming or electricity-storing equipment such as electric vehicles and energy storage power stations.

[0039] Spatially relative terms such as "upper", "lower", "bottom", "top", etc., may be used herein for convenience of description to describe the relationship of one element or feature to other elements or features shown in the drawings. It should be understood that the spatially relative terms may also include different orientations of the device in use and operation in addition to the orientation shown in the drawings.

[0040] The term "and / or" includes any and all combinations of the associated listed items.

[0041] <Battery Pack>

[0042] refer to Figure 1 In some embodiments of the present invention, a battery pack 100 used as a power battery pack for an electric vehicle is provided. The battery pack 100 is a CTP type battery pack, including a box 1 and a battery cell stack 2. Two groups of battery cell stacks 2 can be placed in one box 1, and each group of battery cell stacks 2 is formed by stacking a plurality of soft-pack battery cells 20 along the thickness direction of the soft-pack battery cells 20. Figure 2 It is a schematic structural diagram of one group of battery cell stacks 2.

[0043] Figure 2 Schematic diagram of the structure of the battery cell stack 2. Figure 1 and Figure 2 A plurality of soft-pack battery cells 20 are arranged side by side with the main body portions 201 (ie, the portion consisting of two opposite side surfaces with larger areas of the soft-pack battery cells 20 ) corresponding to each other, thereby forming a battery cell stack 2 .

[0044] Side panels 21 are provided at the ends where multiple soft-pack battery cells 20 are stacked, i.e., on both sides of the battery cell stack 2. The side panels 21 apply a pre-tightening force inward along the stacking direction of the soft-pack battery cells 20 to the battery cell stack 2, which can squeeze to reduce the gaps between the soft-pack battery cells 20 and make the soft-pack battery cells 20 stacked together more compactly.

[0045] After compacting the battery cell stack 2, the battery cell stack 2 is placed into a box (placed inside the box 1). The bottom of the box 1 can be coated with a thermally conductive structural adhesive (not shown) in some areas. Using the thermally conductive structural adhesive, the battery cell stack 2 can be directly bonded to the box 1 as a whole.

[0046] The box body 1 is formed by covering the top plate 11 on the lower shell 12. The lower shell 12 includes a lower shell bottom plate 120 and a beam structure 121. The lower shell bottom plate 120 is a rectangular panel, which matches the size and shape of the top plate 11 and is arranged at the bottom of the lower shell 12. The beam structure 121 is vertically arranged between the top plate 11 and the lower shell bottom plate 120, and includes a side beam 122 and a middle beam 123. Among them, the side beam 122 is arranged at the outer edge of the lower shell bottom plate 120, in a rectangular frame shape, and together with the top plate 11 and the bottom plate, encloses the installation space 10. The middle beam 123 is arranged in the middle of the lower shell bottom plate 120, and divides the installation space 10 inside the box body 1 into a first installation space 101 and a second installation space 102, wherein the first installation space 101 is used to install a group of battery cell stacks 2, and the second installation space 102 is used to install another group of battery cell stacks 2. In some embodiments, an electrical connection component may be provided at the middle beam 123 to electrically connect the two groups of battery cell stacks 2 to each other, and to supply power to the outside of the battery pack 100 via output electrodes provided at the side beams 122 .

[0047] <Output pole piece>

[0048] like Figure 3 As shown, in some embodiments, a fixed end wall 211 is further provided at at least one end of the side plate 21. The fixed end wall 211 is provided in the form of being located at one end of the side plate 21, and has an end surface on which the output pole piece 22 is fixedly provided. The output pole piece 22 is fixedly provided on its end surface.

[0049] A soft-pack battery cell 20 adjacent to the side plate 21 has an output lead-out portion 202 extending from the end of the soft-pack battery cell 20 along its length direction ( Figure 3 (not shown in the figure), the output pole lead portion 202 is welded and fixed to the output pole piece 22.

[0050] The specific fixing form of the output pole piece 22 and the output pole lead-out portion 202, the specific shape of the fixed end wall 211 at the end of the side plate 21, and the specific structure of the output pole piece 22 and the fixed end wall 211 will be illustrated in the following specific implementation manner.

[0051] <First Embodiment>

[0052] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0053] The structure of the battery pack 100 of the first embodiment is Figure 1-Figure 3 The contents described are the same and will not be repeated here.

[0054] Figure 4 It is a partial enlarged view of the end of the side plate 21 of one battery cell stack 2 in the first embodiment.

[0055] like Figure 4 As shown, a fixed end wall 211 is also provided at at least one end of the side plate 21, and the fixed end wall 211 is provided in the form of being located at one or both ends of the side plate 21, and the end surface formed by the fixed end wall 211 can make the output pole bar piece 22 fit and be fixed on the end surface. Specifically, the material of the side plate 21 can be a plastic plate, and the output pole bar piece 22 can be a copper bar, and the output pole bar piece 22 can be pre-fixed on the fixed end wall 221 of the side plate 22 by hot riveting.

[0056] like Figure 4 As shown, the output pole piece 22 also includes an external output portion 221 formed by folding. An opening 222 is provided on the external output portion 221. The opening 222 can be a round hole or a waist hole. The opening 222 is used for connecting and fixing external connecting parts such as connecting bolts to electrically connect with other battery cell stacks or external battery packs.

[0057] like Figure 4 As shown, a soft-pack battery cell 20 adjacent to the side plate 21 has an output pole lead-out portion 202 extending from the end of the soft-pack battery cell 20 along its length direction. After the output pole lead-out portion 202 is bent, the bent portion is overlapped and fixed with the output pole bar 22 in the form of planar contact.

[0058] According to the battery pack provided by the first embodiment of the utility model, an output pole piece 22 is arranged at the end of the side panel 21, and the output pole lead-out portion 202 of the soft-pack battery cell 20 adjacent to the side panel 21 is welded and fixed to the output pole piece 22. On the one hand, the side panel 21 can be fully utilized to provide a pre-tightening force from the end of the battery stack 2 to improve the installation and protection of the battery stack 2. On the other hand, the connection between the output pole piece 22 fixed at the end of the side panel 21 and the output pole lead-out portion 202 can be utilized for fixation, without the need to separately set up a fixing structure for the output pole piece 22, thereby improving the degree of integration and space utilization, and facilitating automated installation.

[0059] More specifically, the output pole piece 22 can be fixed to the end of the side panel 21 in advance by hot riveting or the like to form an integrated side panel assembly including the side panel 21 and the output pole piece 22. That is, when the side panel 21 is installed, the output pole piece 22 is also installed, which reduces the number of parts and improves the efficiency of installation and process management.

[0060] More specifically, Figure 4 As shown, the end of the side panel 21 is provided with a fixed end wall 221 for fixing the output pole piece 22, and the output pole lead-out portion 202 close to the side panel 21 is bent and overlapped and fixed to the output pole piece 22. Based on a simple structure, the output pole lead-out portion 202 and the output pole piece 22 can be directly connected in a small space, which simplifies the installation process and is conducive to improving the volume utilization inside the box body 1, so as to increase the space occupancy rate of the soft-pack battery cell 20.

[0061] in addition, Figure 4 The specific structure of the fixed end wall 221 of the first embodiment shown does not constitute a limitation on the protection scope of the present utility model. Those skilled in the art can understand that any structure that can be set at the end of the side plate 21 and can overlap and fix the output pole piece 22 belongs to the protection scope of the present utility model.

[0062] <Second Embodiment>

[0063] Figure 5 and Figure 6 The schematic structure of the side plate 2 of the battery cell stack 2 provided in the second embodiment of the present invention is shown.

[0064] The same reference numerals as those in the first embodiment in the second embodiment of the utility model represent the same structures, and they will not be described in detail here.

[0065] Figure 5 1 is a partial perspective view of the end of a side plate 21 of a battery cell stack 2 in the second embodiment. Figure 6 This is a partial perspective view of the end of the side plate when viewed from the front direction of the battery cell stack 2.

[0066] The second embodiment is different from the first embodiment in that a step fixing portion 23 is provided at the end of a side panel 21, and the step fixing portion 23 includes a first fixed wall 231 extending and bent from the end of the side panel 21 and a second fixed wall 232 extending and bent from the first fixed wall 231. The first fixed wall 231 and the second fixed wall 232 form a step difference and together constitute the step fixing portion 23.

[0067] like Figure 5 and Figure 6 As shown, the two output pole pieces 22a and 22b (the first output pole piece 22a and the second output pole piece 22b) of the second embodiment are respectively arranged on the first fixed wall 231 and the second fixed wall 232, and are respectively fixed by heat riveting to the first fixed wall 231 and the second fixed wall 232. The first output pole piece 22a and the second output pole piece 22b, which are the same as the output pole piece 22 of the first embodiment, both have an external output portion 221 formed by folding.

[0068] The soft-pack battery cell 20 adjacent to the side panel 21 extends along its length direction at one end corresponding to the step fixing portion 23 to lead out two output pole lead-out portions 202a and 202b (i.e., the positive and negative poles of the battery cell stack 2). After being bent respectively, the bent portions are overlapped and fixed with the first output pole piece 22a and the second output pole piece 22b in the form of planar contact.

[0069] Therefore, the battery pack of the second embodiment is provided with a step fixing portion 23, so that in the length extension direction of the soft-pack battery cell 20, the two output pole pieces, namely the first output pole piece 22a and the second output pole piece 22b, are respectively fixed at different positions of the step fixing portion 23, in a stepped arrangement, that is, the first output pole piece 22a and the second output pole piece 22b are arranged in a staggered manner. At this time, the two electrode lead-out portions, namely the output pole lead-out portion 202a and the output pole lead-out portion 202b, which are led out from the ends of the two soft-pack battery cells 20, are overlapped and fixed with the first output pole piece 22a and the second output pole piece 22b arranged in a stepped manner, respectively, so as to ensure the safety of the electrical insulation between the output pole lead-out portion 202a and the output pole lead-out portion 202b.

[0070] In addition, preferably, the external output portion 221 of the first output pole piece 22a and the external output portion 221 of the second output pole piece 22b are arranged in the height extension direction of the soft-pack battery cell 20 (i.e. Figure 5 Because the external output portion 221 of the first output pole piece 22a and the external output portion 221 of the second output pole piece 22b are also staggered in the height extension direction of the soft-pack battery cell 20, the electrical insulation performance between the external output portions 221 of the first output pole piece 22a and the second output pole piece 22b can be ensured.

[0071] Furthermore, because the first output pole piece 22a and the second output pole piece 22b are staggered and arranged in a stepped manner in the length extension direction of the soft-pack battery cell 20, the external output portion 221 of the first output pole piece 22a and the external output portion 221 of the second output pole piece 22b are arranged in the height extension direction of the soft-pack battery cell 20 (i.e. Figure 5 The first output pole piece 22a and the second output pole piece 22b are staggered in the vertical direction, which fully utilizes the space for compact design and ensures that the first output pole piece 22a and the second output pole piece 22b will not interfere with each other when the side plate 21 is installed, thereby reducing the possibility of contact with each other.

[0072] As described above, in the second embodiment of the utility model, since a step fixing portion 23 including a first fixed wall 231 and a second fixed wall 232 is provided at one end of the side plate 21, two electrode lead-out portions as positive and negative electrodes (output pole lead-out portion 202a and output pole lead-out portion 202b) can be led out at one end of the battery cell stack 2 and overlapped and fixed with the first output pole piece 22a and the second output pole piece 22b arranged in a step manner, respectively, thereby realizing a structure of leading out positive and negative output poles at one end of the side plate 21, thereby improving the flexibility of the external output electrode position configuration of the battery cell stack 2.

[0073] in addition, Figure 5 and Figure 6 The specific structure of the step fixing portion 23 of the second embodiment shown does not constitute a limitation on the protection scope of the present utility model. Those skilled in the art can understand that any other structure that can be set at the end of the side plate 21 and can stagger and overlap and fix the two output pole pieces 22 (the first output pole piece 22a and the second output pole piece 22b) belongs to the protection scope of the present utility model.

[0074] <Third Embodiment>

[0075] Figure 7 and Figure 8 The schematic diagram of the end portion of the side plate 2 of the cell stack 2 provided in the third embodiment of the present invention is shown.

[0076] The same reference numerals as those in the first and second embodiments in the third embodiment of the utility model represent the same structures, and they will not be described in detail herein.

[0077] Figure 7 1 is a partial schematic diagram of the end of a side plate 21 of a battery cell stack 2 in the third embodiment. Figure 8 yes Figure 7 A cross-sectional view of section CC is shown in FIG.

[0078] like Figure 8 As shown, in the third embodiment, an avoidance hole 24 for the output pole lead-out portion 202a to pass through is opened on the step fixing portion 23, specifically on the extended portion of the first fixed wall 231. The avoidance hole 24 is located between two fixed walls, namely the first fixed portion 231 and the second fixed wall 232. The output pole lead-out portion 202a of a soft-pack battery cell passes through the avoidance hole 24 to be fixed to the first output pole bar 22a.

[0079] The specific shape of the avoidance hole 24 is not particularly limited, but it is preferably opened in a form that adapts to the thickness and width of the output pole lead-out portion 202a. More preferably, the avoidance hole 24 can be opened in a form that penetrates to the bottom of the step fixing portion 23 (i.e., the side of the lower shell bottom plate 120 close to the box body 1), so that when the side plate 21 is inserted and installed, the output pole lead-out portion 202a can be inserted into the avoidance hole 24 from the bottom of the step fixing portion 23, so as not to interfere with the step fixing portion 23 at the end of the side plate 21.

[0080] In the third embodiment of the utility model, an output pole lead-out portion 202a is led out through an avoidance hole 24 arranged on the step fixing portion 23, and is fixedly connected to the first output pole piece 22a. The structure can realize the two adjacent output pole lead-out portions 202a and 202b and the two output pole pieces arranged on the same side of the side plate 21, namely the first output pole piece 22a and the second output pole piece 22b, respectively, through a compact integrated design, and they are fixed without interfering with each other.

[0081] <Fourth Embodiment>

[0082] Fig. 9 A partial schematic diagram of the vicinity of the output electrode lead-out portion 202 of the soft-pack battery cell 20 provided in the fourth embodiment of the present utility model is shown.

[0083] The same reference numerals as those in the first embodiment in the fourth embodiment of the utility model represent the same structures, and they will not be described in detail herein.

[0084] In the fourth embodiment of the present utility model, Figure 1 and Figure 2 As shown, the box body 1 further includes a beam structure 121 , which is vertically arranged between the top plate 11 of the box body 1 and the bottom plate 120 of the lower shell, and can specifically be a side beam 122 and a middle beam 123 .

[0085] The side beam 122 is arranged at the outer edge of the lower shell bottom plate 120, in a rectangular frame shape, and together with the top plate 11 and the bottom plate, encloses the battery stack 2. The middle beam 123 is arranged in the middle of the lower shell bottom plate 120, between the two battery stacks 2 arranged inside the box body 1.

[0086] like Fig. 9As shown, the soft-packed battery cell 20 is stacked in the thickness direction with its main body 201 standing upright, and the length direction of the soft-packed battery cell 20 is the length direction of the box body 1. Electrode lead-out portions 202 extend from both ends of the length direction of the soft-packed battery cell 20. The electrode lead-out portion 202 as the positive electrode and the electrode lead-out portion 202 as the negative electrode are respectively located at both ends of the length direction of the soft-packed battery cell 20, and the electrode lead-out portion 202 at one end is close to the side beam 122. In addition, the positive and negative electrodes of adjacent soft-packed battery cells 20 can be rolled and bent and directly overlapped and welded to fix.

[0087] The foam glue 25 is filled between the side beam 122, the main body 201 and the electrode lead-out portion 202. Fig. 9 Only a structural schematic diagram of one side end of the soft-pack battery cell 20 is shown, but specifically, the foam glue 25 can be filled at both ends of the length direction of the soft-pack battery cell 20, that is, between the side beam 122 and the battery cell stack 2 formed by stacking the soft-pack battery cells 20, and between the middle beam 123 of the box body and the battery cell stack 2.

[0088] The foam glue 25 is poured between the soft-pack battery cell 20 and the side beam 122 and the middle beam 123 of the box body. After foaming and curing, the gap between the battery cell stack 2 and the side beam 122 and the gap between the battery cell stack 2 and the middle beam 123 of the box body will be filled with the foam glue 25.

[0089] Through the above method, the foam glue 25 can, on the one hand, fix the battery cell stack 2 and increase the rigidity and strength of the soft-pack CTP battery pack 100; on the other hand, it can isolate the electrode lead-out part 202, including isolating the electrode lead-out part 202 from the high-temperature gas generated during thermal runaway, and realizing electrical insulation between adjacent electrode lead-out parts 202 and between the electrode lead-out part 202 and the box body 1.

[0090] It should be noted that although the utility model Fig. 9 For example, the case where one end of the soft-pack battery 20 in the length direction extends to lead out the electrode lead-out portion 202 as the positive electrode, and the other end extends to lead out the electrode lead-out portion 202 as the negative electrode is described. However, the filling of the foam 25 is also applicable to the case where two electrode lead-out portions 202 as the positive electrode and the negative electrode are simultaneously led out from one end of the soft-pack battery 20, and will not be described in detail here.

[0091] <Fifth Embodiment>

[0092] Fig.10 A schematic diagram of a cell stack 2 provided in a fifth embodiment of the present invention is shown.

[0093] like Fig.10As shown, the box 1 contains two battery stacks 2 each formed by stacking a plurality of soft-pack battery cells 20. At the ends of the stacking direction of the soft-pack battery cells 20, the two battery stacks 2 are clamped from both sides by their own side plates 21. Fig.10 As shown in the figure below, a battery stack 2 is provided at the ends of the two side panels 21 on both sides of the battery stack 2, and output pole pieces 22 are provided. One of the two output pole pieces 22 can be used as a positive pole and the other as a negative pole for connection or output. And the two output pole pieces 22 are arranged on the same side of the battery stack 2. The specific arrangement structure of the output pole piece 22 at the end of the side panel 21 can refer to the specific content of the first embodiment of the utility model, which will not be repeated here.

[0094] Located in Fig.10 Similarly, on the side of the cell stack 2 adjacent to the cell stack 2 at the bottom shown in the figure, the ends of the two side plates 21 on both sides of the cell stack 2 are provided with output pole pieces 22, and one of the two output pole pieces 22 can be used as a positive pole and the other as a negative pole for connection or output. More specifically, it can be as follows Fig.10 As shown, the output pole pieces 22 of two adjacent different battery cell stacks can be configured with opposite polarities to facilitate electrical connection.

[0095] In addition, Fig.10 As shown in the figure, a battery cell stack 2 is provided at the top, and a first output pole piece 22a and a second output pole piece 22b are provided at the end of one of the side plates 22 on the side opposite to the output pole piece 22. The specific arrangement structure of the first output pole piece 22a and the second output pole piece 22b at the end of the side plate 21 can be referred to the specific content of the second embodiment of the present utility model, and will not be repeated here.

[0096] According to the battery pack of the fifth embodiment of the present invention, in the length extension direction of the soft-pack battery cell 20, as shown in FIG. Fig.10 As shown in the lower battery stack 2 in the figure, the two output pole pieces 22 are located on the same side of the battery stack 2, and the two output pole pieces 22 are respectively fixed on two different side panels 21 on both sides of the stacking direction of the soft-pack battery cells 20 in the battery stack 2.

[0097] Because the two output pole pieces 22 are respectively mounted on the two side plates 21 and are located on the same side of the battery cell stack 2, such an output pole piece structure is conducive to the connection with other adjacent battery cell stacks 2 ( Fig.10 The positive and negative electrodes of the upper battery cell stack 2) shown in the figure are connected adjacently, and the compact structure reduces the internal electrical connection length, reduces the internal insulation protection requirements of the battery pack, and also improves the volume utilization of the battery pack.

[0098] In addition, if Fig.10 As shown in the upper battery cell stack 2, in the length extension direction of the soft-pack battery cell 20, two output pole pieces, namely the first output pole piece 22a and the second output pole piece 22b, are located on the same side of the battery cell stack 2, and the two output pole pieces are fixed on the same side plate 21 on the same side of the battery cell stack 2.

[0099] Therefore, the structure in which the two output pole pieces, namely the first output pole piece 22a and the second output pole piece 22b, are located at the same end of the same side plate 21 makes it easy to assemble and electrically connect the two output pole pieces, namely the first output pole piece 22a and the second output pole piece 22b, when used as the external total output pole of the battery pack.

[0100] That is to say, Fig.10 The three fixed end walls 211 of the two end plates 21 in the upper battery cell stack 2 shown in FIG. 1 are provided with output pole pieces. Fig.10 In the lower battery cell stack 2 shown in the figure, only two end walls of the two end plates 21 are provided with output pole pieces.

[0101] In other embodiments, output pole tabs are provided on the four fixed end walls 211 of the two end plates 21 in the upper battery cell stack 2 (the two external output pole tabs of the battery pack are provided separately), and output pole tabs are provided on only two end walls of the two end plates 21 in the lower battery cell stack 2.

[0102] In addition, the various structures and technical effects described in the first to fourth embodiments of the present invention are all applicable to the fifth embodiment and will not be repeated here.

[0103] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: Box; A battery cell stack is formed by stacking a plurality of soft-pack battery cells and is disposed in the box, wherein the soft-pack battery cells have electrode lead-out portions, and the electrode lead-out portions of at least two adjacent soft-pack battery cells are directly overlapped and welded to be fixed; Thermally conductive structural adhesive, the thermally conductive structural adhesive is directly bonded between the battery cell stack and the box; A side plate, arranged on a side of the battery stack along a stacking direction of the soft-pack battery cells in the battery stack; The output electrode piece is fixedly arranged at at least one end of the side plate in a form corresponding to the electrode lead-out portion. Part of the electrode lead-out portion is formed as an output pole lead-out portion, and the output pole bar is welded and fixed to the output pole lead-out portion.

2. The battery pack according to claim 1, characterized in that: In the length extension direction of the soft-pack battery cell, the end of the side panel has a fixed end wall, the output pole piece is fixed on the fixed end wall, and at least one output pole lead-out portion close to the side panel is bent and overlapped and fixed on the output pole piece.

3. The battery pack according to claim 2, characterized in that: In the length extension direction of the soft-pack battery cell, the two output pole pieces are located on the same side of the battery cell stack, and the two output pole pieces are respectively fixed on the two side plates on both sides of the stacking direction of the soft-pack battery cells in the battery cell stack.

4. The battery pack according to claim 2, characterized in that: In the length extension direction of the soft-pack battery cell, the two output pole pieces are located on the same side of the battery cell stack, and the two output pole pieces are fixed on the same side plate on one side of the battery cell stack.

5. The battery pack according to claim 4, characterized in that: The fixed end wall has a step fixing portion, and the two output pole pieces are respectively fixed on the step fixing portion.

6. The battery pack according to claim 5, characterized in that: The step fixing portion has two fixed walls, and the two fixed walls are staggered in the length extension direction of the soft-pack battery cell. The two output pole pieces are respectively fixed on the two fixed walls, so that the two output pole pieces are staggered with each other in the length extension direction of the soft-pack battery cell.

7. The battery pack according to claim 5, characterized in that: The top of the output pole piece is configured as an external output portion, and the external output portions of the two output pole pieces are staggered in a height extension direction of the soft-pack battery cell.

8. The battery pack according to claim 6, characterized in that: The step fixing portion is provided with an avoidance hole for the output pole lead-out portion to pass through, the avoidance hole is located between the two fixing walls, and at least one of the output pole lead-out portions is suitable for passing through the avoidance hole to be fixed to the output pole bar.

9. The battery pack according to any one of claims 1 to 8, characterized in that: Also includes: The box body comprises: a beam structure, the soft-pack battery cell comprises a main body and at least the electrode lead-out portion arranged at one end of the main body close to the beam structure, and the foamed glue is filled between the beam structure, the main body and the electrode lead-out portion.

10. An electronic device, characterized in that: A battery pack as claimed in any one of claims 1 to 9.

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