Battery cell stack and battery module

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cell stacking body and a battery module, the battery cell stacking body comprises a soft package battery cell, and an electrode is arranged on the first edge of the soft package battery cell; the plurality of soft package battery cells are mutually stacked along a first direction; projections of adjacent edges of at least one first edge of each soft package battery cell in the first direction are aligned; the adjacent edges of the first edges of the plurality of soft package battery cells comprise sealing parts, and at least one sealing part comprises a flanging part, so that the sealing part of the soft package battery cell does not protrude out of the end surface of the battery cell stacking body, and at least one sealing part is only bent once. According to the utility model, the projections of the adjacent edges of at least one first edge of each soft package battery cell in the first direction are aligned, so that the aligned edges can be used for positioning the battery cell stack and the shell, and the positive electrode and the negative electrode can be ensured to be aligned with the via holes in the cover plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery core stack and a battery module. Background Art

[0002] A battery module is generally composed of multiple single cells. Specifically, multiple single cells are stacked in the same module shell, and the positive and negative electrodes of each single cell are staggered and welded to realize the series and parallel connection of the battery circuit to achieve the required battery voltage and energy. Before the soft-pack battery is put into the shell, the folding process of folding the sealing area to the side of the battery cell is a necessary process to unify the size of the battery in the shell.

[0003] In the currently commonly used process, the battery cells are folded one by one during production, and then stacked, pasted, and pressurized into the shell. When stacking and pasting, all electrodes are required to be inserted into the electrode slots without hindrance, without misalignment and large offset (the electrodes cannot be stuck to the edge of the slot), so it is necessary to position the battery cells by the edge, that is, by the edge of the battery cells after folding, so as to ensure the accuracy of the battery stacking position. In addition, to ensure the safety of the battery, a temperature sensor will be installed in the shell, but the temperature sensor cannot directly contact the battery to ensure the reliability of the data. Therefore, the low accuracy of the battery cell position during stacking will directly lead to a series of problems such as seal failure and even safety accidents.

[0004] For small soft-pack batteries, the folding process can easily cause size fluctuations and appearance deformation of the battery, which may affect the electrochemical performance and service life of the battery. In severe cases, it may even cause safety problems for the entire module and battery pack.

[0005] Secondly, in the current process, the folding process is generally to fold the single soft-pack battery cells one by one before the single soft-pack battery cells come off the line. However, this process is not only inefficient, but also has relatively poor precision for small soft-pack batteries, which can easily cause problems with the size and appearance of the soft-pack batteries, especially in the folding process, which is not completely a tight right-angle fold, but most of them are arc folds with gaps. Therefore, it is difficult to accurately locate the entire battery cell at the edge during the battery cell stacking process. This will cause the stacked battery cell electrodes to be misaligned, and even unable to be inserted into the shell slot, resulting in a large number of battery cell losses.

[0006] In addition, in the current folding process, the height of the battery side seal edge of the soft-pack battery cell often exceeds the thickness of the battery cell body after folding, causing mutual interference and extrusion between the battery cells in the module. This has a huge impact on the edge seal of the battery cell, causing wear on the edges and upper and lower corners. In long-term use, problems such as seal failure and reduced service life may occur. At the same time, the sealing edge of the battery cell will inevitably bend at an angle of plastic deformation, which will not only affect the packaging performance of the battery, but may also cause the deformed aluminum-plastic film shell to squeeze the battery cell body, causing battery failure. In addition, if the width of the battery cell after folding is too large, it will also affect the placement of the temperature sensor, which may cause the sensor to fail, or even battery thermal failure and safety issues. Utility Model Content

[0007] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a battery cell stack and a battery module that are convenient for improving the assembly accuracy of the battery module.

[0008] In order to achieve the above-mentioned object and other related objects, the utility model provides a battery cell stack, comprising:

[0009] A soft-pack battery cell, wherein at least one electrode is provided on a first edge of the soft-pack battery cell;

[0010] A plurality of the soft-pack battery cells are stacked on each other along a first direction;

[0011] The projections of adjacent edges of at least one first edge of each of the soft-pack battery cells in the first direction are aligned;

[0012] The adjacent edges of the first edges of the multiple soft-pack battery cells include a sealing portion, and at least one of the sealing portions includes a flange portion so that the sealing portion of the soft-pack battery cell does not protrude from the end face of the battery cell stack, and the end face is the large surface of the soft-pack battery cell in the outermost layer of the battery cell stack, and at least one of the sealing portions is bent only once.

[0013] The projections of adjacent edges of at least one of the first edges of each soft-pack battery cell of the utility model in the first direction are aligned, so the aligned edges can be used to position the battery cell stack and the shell, ensuring that the positive electrode and the negative electrode can be aligned with the via holes on the cover plate; the sealing portion of the soft-pack battery cell does not protrude from the end face of the battery cell stack, avoiding interference between the sealing portion and the shell of the battery module, further improving the assembly quality of the battery module.

[0014] In an optional embodiment of the present invention, the adjacent edge of the first edge includes a second edge, the distance between the electrode and the second edge is a first preset value, the projections of the second edges of at least two of the soft-pack battery cells in the first direction are aligned, and the projections of the electrodes of the soft-pack battery cells in the first direction are aligned.

[0015] The advantage of the above optional embodiment is that in this embodiment, at least two soft-pack battery cells are stacked in the same posture, and the electrodes of these soft-pack battery cells in the same posture are aligned with each other, so as to facilitate parallel connection of the tabs of these soft-pack battery cells to meet the battery parameter requirements.

[0016] In an optional embodiment of the present invention, the adjacent edge of the first edge includes a third edge, and the distance from the electrode to the third edge is a second preset value; at least one of the soft-pack battery cells is stacked in a first posture, and at least one of the soft-pack battery cells is stacked in a second posture, wherein the second edge of the soft-pack battery cell stacked in the first posture is aligned with the projection of the third edge of the soft-pack battery cell stacked in the second posture in the first direction.

[0017] The advantage of the above optional embodiment is that in this embodiment, when the soft-pack battery cells are stacked in two different postures, the battery cells in these two postures can be positioned through the same side of the battery cell stack, thereby improving assembly efficiency and assembly accuracy.

[0018] In an optional embodiment of the present invention, center lines of projections of the electrodes of the soft-packed cells stacked in the first posture and the electrodes of the soft-packed cells stacked in the second posture in the first direction do not overlap.

[0019] The advantage of the above optional embodiment is that: this embodiment can make the electrodes of the soft-pack battery cells in two postures staggered with each other, thereby facilitating the subsequent installation of the busbar.

[0020] In an optional embodiment of the present invention, the projections of at least two electrodes of the soft-pack battery cells stacked in the first posture in the first direction are aligned, and / or the projections of at least two electrodes of the soft-pack battery cells stacked in the second posture in the first direction are aligned.

[0021] The advantage of the above optional embodiment is that in this embodiment, at least two soft-pack batteries in each posture are provided, and the electrodes of the soft-pack batteries in the same posture are aligned with each other, which facilitates the soft-pack batteries in the same posture to be connected in parallel to meet the battery parameter requirements.

[0022] In an optional embodiment of the present invention, the sealing portion of at least one outermost soft-pack battery cell of the battery cell stack is bent in a direction away from the middle layer of the battery cell stack, and the edge of the sealing portion of the soft-pack battery cell is provided with the flange portion so that the sealing portion of the soft-pack battery cell does not protrude from the end surface of the battery cell stack.

[0023] The advantage of the above optional embodiment is that it should be understood that the sealing part of the outermost soft-pack battery cell of the battery cell stack is most likely to protrude from the end surface. Therefore, this embodiment provides a flange portion on the sealing part of the soft-pack battery cell, which can effectively prevent the sealing part from interfering with the shell.

[0024] In an optional embodiment of the present invention, the sealing portion includes a first sealing portion arranged at the second edge, and a second sealing portion arranged at the third edge; the distance between the electrode and the edge of the first sealing portion in the flattened state is a third preset value, and the distance between the electrode and the edge of the second sealing portion in the flattened state is a fourth preset value.

[0025] The advantage of the above optional embodiment is that in this embodiment, since the distance between the electrode and the sealing part in the flattened state is constant, the sealing part can be used to position the electrode before the sealing part is bent, thereby improving the assembly accuracy.

[0026] In an optional embodiment of the present invention, a plurality of continuously stacked soft-pack battery cells constitute a sub-stack, the sealing portion of each of the soft-pack battery cells in the sub-stack is bent toward a first end of the sub-stack, and the sealing portions of the other soft-pack battery cells except a layer of the soft-pack battery cells closest to the first end are bent only once, and the first end is one end of the sub-stack in the first direction.

[0027] The advantage of the above optional embodiment is that in this embodiment, all the sealing parts in the same sub-stack are bent in the same direction, and the bending of these sealing parts can be carried out simultaneously, which greatly improves the bending efficiency of the sealing parts and the dimensional accuracy after bending.

[0028] In an optional embodiment of the present invention, in two adjacent soft-pack battery cells, at least the two sealing portions located on one side of the two soft-pack battery cells are bent in directions away from each other to form a space for accommodating the temperature sensor assembly.

[0029] The advantage of the above optional embodiment is that in this embodiment, after the sealing parts of adjacent soft-pack battery cells are bent in opposite directions, a relatively large receiving space is formed, and the temperature sensor component is installed in this space, which can avoid squeezing the temperature sensor component.

[0030] In an optional embodiment of the present invention, at least one sealing portion of each of the soft-pack battery cells is fixed to the battery cell stack body through a fixing unit, and the fixing unit includes at least one of an adhesive tape and a fixing glue.

[0031] The advantage of the above optional embodiment is that the seal part can be fixed to the main body of the soft-pack battery cell, thereby preventing the seal part from being misaligned during the process of inserting the battery cell stack into the shell, thereby improving the assembly quality.

[0032] In an optional embodiment of the present invention, n of the soft-pack battery cells are stacked into m stacking units, where n is a multiple of m, and the soft-pack battery cells in the same stacking unit are stacked in the same posture; every two of the stacking units are stacked into a stacking section, and the postures of the two stacking units in the same stacking section are opposite; and the stacking sections are stacked on each other to form a battery cell stack.

[0033] The advantage of the above optional embodiment is that: this embodiment realizes the series-parallel connection of soft-pack battery cells through a reasonable combination method, which improves the space utilization while meeting the battery parameter requirements, thereby improving the energy density of the battery.

[0034] In order to achieve the above-mentioned purpose and other related purposes, the utility model also provides a battery module, including the battery cell stack, and

[0035] A shell body, provided with a cavity for accommodating the battery cell stack, and one end of the shell body is open;

[0036] A cover plate is installed at one open end of the shell, and a through hole is provided on the cover plate. Each of the electrodes in the battery cell stack protrudes out of the outer side of the cover plate through the through hole.

[0037] The battery module provided in this embodiment can use the aligned edges to position the battery cell stack and the shell, ensuring that the positive electrode and the negative electrode can be aligned with the via holes on the cover plate, thereby improving the assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the matching structure of the soft-pack battery cell and the positioning block provided in an embodiment of the utility model;

[0039] Figure 2 It is a side view of a soft-pack battery cell provided in an embodiment of the utility model;

[0040] Figure 3 It is a schematic diagram of the soft-pack battery cell stacking process provided by an embodiment of the utility model;

[0041] Figure 4 is a top view of a battery cell stack provided by an embodiment of the utility model;

[0042] Figure 5 It is a partial structural schematic diagram of a battery cell stack provided by an embodiment of the utility model;

[0043] Figure 6 is a side view of a battery cell stack provided by an embodiment of the utility model;

[0044] Figure 7 It is a front view of a battery cell stack provided by an embodiment of the utility model;

[0045] Figure 8 It is a top view of the state of the battery cell stack provided by the embodiment of the utility model before being put into the shell;

[0046] Fig. 9 It is a side view of the state of the battery cell stack provided by the embodiment of the utility model before being put into the shell;

[0047] Fig.10 This is a front view of the battery cell stack provided by an embodiment of the utility model before being put into the shell;

[0048] Fig.11 is a cross-sectional view of a housing and a cover provided in an embodiment of the utility model;

[0049] Fig.12 is a top view of a cover plate provided in an embodiment of the utility model;

[0050] Fig.13 is a cross-sectional view of a battery module provided by an embodiment of the utility model;

[0051] Fig.14 is a top view of a battery module provided by an embodiment of the utility model;

[0052] Fig.15 It is a top view of the battery module provided by the embodiment of the utility model with the cover plate removed.

[0053] Explanation of the accompanying drawings: 1. soft-pack battery cell; 10. stacking unit; 100. sub-stack; 1000. battery cell stack; 11. positive electrode; 12. negative electrode; 13. first sealing part; 14. second sealing part; 15. first large surface; 16. second large surface; 17. flange part; 20. temperature sensor assembly; 21. sensor; 22. signal transmission part; 30. shell; 31. cover plate; 32. via; 33. wire hole; 40. tape; 50. positioning block. DETAILED DESCRIPTION

[0054] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0055] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0056] The embodiment of the utility model provides a battery module, such as Figure 13-15 As shown, the battery module includes a battery cell stack 1000, a shell 30 and a cover plate 31; Figure 4-10 As shown, the battery cell stack 1000 is formed by stacking a plurality of soft-pack battery cells 1. Fig.11 As shown, the housing 30 is provided with a cavity for accommodating the battery cell stack 1000, and one end of the housing 30 is open; the cover plate 31 is installed at the open end of the housing 30, as shown in FIG. Fig.12 As shown, the cover plate 31 is provided with a through hole 32 , and each positive electrode 11 and negative electrode 12 in the battery cell stack 1000 protrudes out of the outside of the cover plate 31 through the through hole 32 .

[0057] In the present invention, there is no special restriction on the shape of the shell 30. For example, in a specific embodiment, the shell 30 can be a square shell 30. Square shell batteries are a commonly used battery type in the current new energy field. Therefore, the square shell 30 has good compatibility with many application scenarios. However, it should be noted that with the continuous expansion of battery application scenarios, it is not ruled out that the shell 30 may be set to other shapes.

[0058] See also Figure 3-10As shown, the battery cell stack 1000 includes a plurality of soft-pack battery cells 1, wherein an electrode, such as a positive electrode 11 and / or a negative electrode 12, is provided on a first edge of the soft-pack battery cell 1. In some other embodiments, the positive electrode 11 and the negative electrode 12 may also be disposed on two opposite edges of the soft-pack battery cell 1; a first sealing portion 13 is provided on a second edge of the soft-pack battery cell 1, wherein the second edge is adjacent to the first edge; it should be noted that the first sealing portion 13 and the second sealing portion 14 mentioned later are naturally formed due to the packaging process of the soft-pack battery cell 1. Specifically, the outer shell of the soft-pack battery cell 1 is generally composed of two aluminum-plastic films (or an aluminum-plastic film folded in half), and the surface formed by the two aluminum-plastic films is generally referred to as the large surface of the soft-pack battery cell 1. The edges of the two aluminum-plastic films are pressed together to form a sealing portion, and the pressed aluminum-plastic films can form a closed space for accommodating electrode sheets and electrolyte.

[0059] See also Figure 4 , 6 As shown, multiple soft-pack battery cells 1 are stacked along the first direction; the projections of adjacent edges of at least one of the first edges of each of the soft-pack battery cells 1 in the first direction are aligned, and the distance from the electrode to the second edge is a first preset value. It should be noted that the distance refers to the distance between the geometric center of the electrode and the projection of the second edge in the first direction, and the projections of the second edges of at least two of the soft-pack battery cells 1 in the first direction are aligned, and the projections of the electrodes of each of the soft-pack battery cells whose projections of the second edges in the first direction are aligned are aligned. In this embodiment, since the distance from the electrode to the second edge is determined, when the second edges of multiple soft-pack battery cells 1 are aligned, the electrodes of these soft-pack battery cells will also be aligned accordingly.

[0060] In a further specific embodiment, the first sealing portion 13 of each soft-pack battery cell 1 is bent toward one side of each soft-pack battery cell 1, that is, the first sealing portion 13 is bent toward one of the large faces of the soft-pack battery cell 1; the distance between the electrode and the edge of the first sealing portion in the flattened state is a third preset value, specifically, the vertical distance between the positive electrode 11 of each soft-pack battery cell 1 and the edge of the first sealing portion 13 of each soft-pack battery cell 1 in the flattened state is consistent; the vertical distance between the negative electrode 12 of each soft-pack battery cell 1 and the edge of the first sealing portion 13 of each soft-pack battery cell 1 in the flattened state is consistent; at least part of the second edges of the soft-pack battery cells 1 face the same direction, and the edges of the first sealing portion 13 of this part of the soft-pack battery cells 1 in the flattened state are aligned, so that the positive electrode 11 and the negative electrode 12 of this part of the soft-pack battery cells 1 are aligned respectively. It should be noted that the flattened state described in the utility model refers to the state of the sealing portion before bending, specifically, when the sealing portion is in the flattened state, it should be parallel to the large face of the soft-pack battery cell.

[0061] It should be understood that, since the vertical distances between the positive electrode 11 of each soft-pack battery cell 1 of the utility model and the edge of the first sealing portion 13 of each soft-pack battery cell 1 in the flattened state are consistent, and the vertical distances between the negative electrode 12 of each soft-pack battery cell 1 and the edge of the first sealing portion 13 of each soft-pack battery cell 1 in the flattened state are consistent, the positive electrode 11 and the negative electrode 12 of each soft-pack battery cell 1 can be positioned by the first sealing portion 13 in the flattened state; specifically, as Figure 1 As shown, when the first sealing portion 13 is flattened, the edge of the first sealing portion 13 of each soft-pack battery cell 1 can be positioned using a positioning block 50. Since the relative positions between the positive electrode 11 and the negative electrode 12 and the first sealing portion 13 are determined, when the first sealing portions 13 of each soft-pack battery cell 1 are aligned, the positive electrode 11 and the negative electrode 12 of each soft-pack battery cell 1 can be aligned. Because the projections of the adjacent edges of at least one of the first edges of each soft-pack battery cell 1 in the first direction are aligned, the aligned edges can be used to position the battery cell stack 1000 and the shell 30 to ensure that the positive electrode 11 and the negative electrode 12 can be aligned with the through hole 32 on the cover plate 31. Based on the battery cell stack 1000 provided by the utility model, only a slight adjustment is needed to the assembly process of the battery module to greatly improve the accuracy of the electrode position, avoid interference between the electrode and the cover plate 31 due to position offset, and improve the assembly quality of the battery module. Specifically, the folding process of the sealing part can be moved to after the stacking process. When the soft-pack battery cells 1 are stacked, their sealing parts are in a flattened state. At this time, the sealing parts can be used to accurately position the positive electrode 11 and the negative electrode 12. After the stacking is completed, the sealing parts of each soft-pack battery cell 1 can be bent uniformly. This can also avoid mutual interference between the bent sealing parts, and at the same time facilitate the alignment of the edges of each soft-pack battery cell 1, further improving the packaging quality of the battery module.

[0062] See also Figure 1 , 3-As shown in FIG10, in an optional embodiment of the utility model, a second sealing portion 14 is provided on the third edge of the soft-pack battery cell 1, and the third edge is adjacent to the first edge and opposite to the second edge; the distance from the electrode to the third edge is a second preset value, and similarly, the distance refers to the distance between the geometric center of the electrode and the projection of the third edge in the first direction; at least one of the soft-pack battery cells 1 is stacked in a first posture, and at least one of the soft-pack battery cells 1 is stacked in a second posture, wherein the second edge of the soft-pack battery cell 1 stacked in the first posture is aligned with the projection of the third edge of the soft-pack battery cell 1 stacked in the second posture in the first direction. It should be understood that in the battery cell stack 1000, not all soft-pack battery cells 1 are necessarily stacked in the same posture. In fact, in order to facilitate the series and parallel connection of each soft-pack, it may be necessary to stagger the electrodes of some soft-pack battery cells 1. This requires flipping some soft-pack battery cells 1 180° relative to other soft-pack battery cells 1. Therefore, not all second edges of soft-pack battery cells 1 are located on the same side. Therefore, in order to position the soft-pack battery cells 1 in these two postures at the same time, this embodiment sets the relative position between the electrode and the third edge to a certain value, so that the soft-pack battery cells 1 in two different postures in the battery cell stack 1000 can be positioned at the same time.

[0063] The second sealing part 14 of each soft-pack battery cell 1 is bent toward one side of each soft-pack battery cell 1; the distance between the electrode and the edge of the second sealing part in the flattened state is a fourth preset value, specifically, the vertical distance between the positive electrode 11 of each soft-pack battery cell 1 and the edge of the second sealing part 14 of each soft-pack battery cell 1 in the flattened state is consistent; the vertical distance between the negative electrode 12 of each soft-pack battery cell 1 and the edge of the second sealing part 14 of each soft-pack battery cell 1 in the flattened state is consistent. In this way, the positioning block 50 can be used to simultaneously position the electrodes of the soft-pack battery cells 1 in two postures during the stacking stage.

[0064] For example, in one embodiment, some soft-pack battery cells 1 are stacked in a first posture, and the remaining soft-pack battery cells 1 are stacked in a second posture, wherein the second edge of the soft-pack battery cell 1 in the first posture and the third edge of the soft-pack battery cell 1 in the second posture face the same direction; and the edge of the first sealing portion 13 of the soft-pack battery cell 1 in the first posture in the flattened state is aligned with the edge of the second sealing portion 14 of the soft-pack battery cell 1 in the second posture in the flattened state. The center lines of the projections of the positive electrode 11 and the negative electrode 12 of the soft-pack battery cell 1 in the first posture in the first direction do not overlap with the center lines of the projections of the positive electrode 11 and the negative electrode 12 of the soft-pack battery cell 1 in the second posture in the first direction. Specifically, Figure 3Taking the shown embodiment as an example, the battery cell stack 1000 in this embodiment includes 12 soft-pack battery cells 1. First, 3 soft-pack battery cells 1 are grouped together to stack the 12 soft-pack battery cells 1 into 4 stacking units 10, and the soft-pack battery cells 1 in the same stacking unit 10 are stacked in the same posture; every two stacking units 10 are stacked into a stacking section 100, with a total of two stacking sections 100, and the postures of the two stacking units 10 in the same stacking section 100 are opposite; finally, the two stacking sections 100 are stacked together to form a battery cell stack 1000; in this embodiment, the electrodes of the three soft-pack battery cells 1 in the same stacking unit 10 are aligned, which is convenient for connecting the three soft-pack battery cells 1 in parallel, and the electrodes of two adjacent stacking units 10 are staggered with each other, which is convenient for connecting adjacent stacking units 10 in series. This embodiment finally forms a 3-parallel 4-series battery structure.

[0065] It should be understood that the number, stacking method and series-parallel method of the soft-pack battery cells 1 are not unique. For example, in some other embodiments, all the soft-pack battery cells 1 in the battery cell stack 1000 can be connected in parallel with each other. At this time, all the soft-pack battery cells 1 can be stacked in the same posture; of course, each soft-pack battery cell 1 can also be divided into more or fewer stacking units 10 to meet different voltage and power requirements, and the utility model will not go into details one by one.

[0066] See also Figure 4 , 5 As shown, in an optional embodiment of the utility model, a plurality of continuously stacked soft-packed cells 1 constitute a sub-stack, a soft-packed cell 1 at the first end of the sub-stack constitutes the soft-packed cell 1 of the outermost layer of the cell stack, the first sealing portion 13 and the second sealing portion 14 of each soft-packed cell 1 in the sub-stack are bent toward the first end of the sub-stack, and the edges of the first sealing portion 13 and the second sealing portion 14 of a soft-packed cell 1 located at the first end of the sub-stack in the sub-stack are provided with a flange portion 17, so that the first sealing portion 13 and the second sealing portion 14 of the soft-packed cell 1 do not protrude from the first end of the sub-stack, and further the sealing portion of the soft-packed cell 1 does not protrude from the end face of the cell stack; it should be noted that the end face is the large face of the soft-packed cell of the outermost layer of the cell stack, and the first end is one end of the sub-stack in the first direction. In this way, the sealing portion can avoid interference with the outer shell of the battery module, and further improve the assembly quality of the battery module. At the same time, since the sealing parts in the same sub-stack are bent toward the same end of the sub-stack, even if the sealing parts of all the inner soft-pack battery cells 1 are bent only once, no interference will occur, thereby simplifying the process flow; it should be understood that all the inner soft-pack battery cells 1 mentioned here do not include a soft-pack battery cell 1 located at the outermost layer at the first end of the sub-stack.

[0067] See also Figure 8 , 10As shown, in an optional embodiment of the utility model, in two adjacent soft-packed cells 1, at least two first sealing portions 13, or two second sealing portions 14, or one first sealing portion 13 and one second sealing portion 14 located on one side of the two soft-packed cells 1 are bent in a direction away from each other, so that a space for accommodating the temperature sensor assembly 20 is formed between the two. Specifically, when the temperature sensor assembly 20 is installed between two soft-packed cells 1 in the same posture, the two sealing portions bent in a direction away from each other are both the first sealing portion 13 or the second sealing portion 14; and when the temperature sensor assembly 20 is installed between two soft-packed cells 1 in different postures, the two sealing portions bent in a direction away from each other are respectively the first sealing portion 13 and the second sealing portion 14. In the illustrated embodiment, the temperature sensor assembly 20 is installed between two stacking portions 100, but it should be understood that in some other embodiments, the temperature sensor assembly 20 can also be installed between other two adjacent soft-packed cells 1.

[0068] In a specific embodiment, the temperature sensor assembly 20 may include, for example, a sensor 21 and a signal conducting portion 22 , and a wire hole 33 for the signal conducting portion to pass through may be provided on the cover plate 31 .

[0069] See also Figure 1 , 8 As shown, the soft-pack battery cell 1 includes a first large surface 15 and a second large surface 16 opposite to each other. Affected by the packaging process of the soft-pack battery cell 1, the first sealing portion 13 and the second sealing portion 14 are generally flush with the first large surface 15; it should be noted that a certain amount of pressurization is required before the battery cell stack 1000 is put into the shell to reduce the thickness of the stack and increase the energy density. At this time, the gap between adjacent sealing portions will be compressed. In order to ensure that the temperature sensor assembly 20 has sufficient installation space, the temperature sensor assembly 20 can be installed between the two soft-pack battery cells 1 whose second large surfaces 16 are in contact with each other, such as Figure 8 As shown, there is a wider space between the sealing parts of the two soft-pack battery cells 1 to accommodate the temperature sensor assembly 20.

[0070] See also Figure 8 , 10 As shown, in an optional embodiment of the present invention, at least one of the sealing parts of each of the soft-packed battery cells 1 is fixed to the battery cell stack body through a fixing unit, and the fixing unit includes at least one of a tape 40 and a fixing glue. It should be noted that the battery cell stack body refers to the part of the battery cell stack other than the sealing parts, and the sealing part can be fixed to the side of the soft-packed battery cell 1, or to the top or bottom surface of the soft-packed battery cell 1.

[0071] Adjacent soft-pack battery cells 1 may be connected by gluing, and the sealing parts and the temperature sensor assembly 20 and the sealing part may be fixed by adhesive tape 40 or structural adhesive.

[0072] To sum up, the projections of adjacent edges of at least one of the first edges of each soft-pack battery cell of the utility model in the first direction are aligned, so the aligned edges can be used to position the battery cell stack and the shell, ensuring that the positive electrode and the negative electrode can be aligned with the via holes on the cover plate; the sealing portion of the soft-pack battery cell does not protrude from the end face of the battery cell stack, avoiding interference between the sealing portion and the outer shell of the battery module, further improving the assembly quality of the battery module.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

[0074] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more specific details or by other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

Claims

1. A battery cell stack, characterized in that: include: A soft-pack battery cell, wherein at least one electrode is provided on a first edge of the soft-pack battery cell; A plurality of the soft-pack battery cells are stacked on each other along a first direction; The projections of adjacent edges of at least one first edge of each of the soft-pack battery cells in the first direction are aligned; The adjacent edges of the first edges of the multiple soft-pack battery cells include a sealing portion, and at least one of the sealing portions includes a flange portion so that the sealing portion of the soft-pack battery cell does not protrude from the end face of the battery cell stack, and the end face is the large surface of the soft-pack battery cell in the outermost layer of the battery cell stack, and at least one of the sealing portions is bent only once.

2. The battery cell stack according to claim 1, characterized in that: The adjacent edge of the first edge includes a second edge, the distance between the electrode and the second edge is a first preset value, the projections of the second edges of at least two of the soft-pack battery cells in the first direction are aligned, and the projections of the electrodes of the soft-pack battery cells in the first direction are aligned.

3. The battery cell stack according to claim 2, characterized in that: The adjacent edges of the first edge include a third edge, and the distance from the electrode to the third edge is a second preset value; at least one of the soft-pack batteries is stacked in a first posture, and at least one of the soft-pack batteries is stacked in a second posture, wherein the second edge of the soft-pack battery stacked in the first posture is aligned with the projection of the third edge of the soft-pack battery stacked in the second posture in the first direction.

4. The battery cell stack according to claim 3, characterized in that: Center lines of projections of the electrodes of the soft-packed cells stacked in the first posture and the electrodes of the soft-packed cells stacked in the second posture in the first direction do not overlap.

5. The battery cell stack according to claim 3, characterized in that: The projections of at least two electrodes of the soft-pack battery cells stacked in the first posture in the first direction are aligned, and / or the projections of at least two electrodes of the soft-pack battery cells stacked in the second posture in the first direction are aligned.

6. The battery cell stack according to claim 1, characterized in that: The sealing portion of at least one outermost soft-pack battery cell of the battery cell stack is bent in a direction away from the middle layer of the battery cell stack, and the edge of the sealing portion of the soft-pack battery cell is provided with the flange portion so that the sealing portion of the soft-pack battery cell does not protrude from the end surface of the battery cell stack.

7. The battery cell stack according to claim 3, characterized in that: The sealing portion includes a first sealing portion arranged at the second edge, and a second sealing portion arranged at the third edge; the distance between the electrode and the edge of the first sealing portion in the flattened state is a third preset value, and the distance between the electrode and the edge of the second sealing portion in the flattened state is a fourth preset value.

8. The battery cell stack according to claim 6, characterized in that: A plurality of continuously stacked soft-pack battery cells constitute a sub-stack, the sealing portion of each of the soft-pack battery cells in the sub-stack is bent toward a first end of the sub-stack, and the sealing portions of the other soft-pack battery cells except a layer of the soft-pack battery cells closest to the first end are bent only once, and the first end is one end of the sub-stack in the first direction.

9. The battery cell stack according to claim 1, characterized in that: In two adjacent soft-pack battery cells, at least two sealing portions located on one side of the two soft-pack battery cells are bent in directions away from each other, so that a space for accommodating the temperature sensor assembly is formed between the two.

10. The battery cell stack according to claim 1, characterized in that: At least one sealing portion of each of the soft-pack battery cells is fixed to the battery cell stack body through a fixing unit, and the fixing unit includes at least one of an adhesive tape and a fixing glue.

11. The battery cell stack according to claim 3, characterized in that: n soft-packed cells are stacked into m stacking units, where n is a multiple of m, and the soft-packed cells in the same stacking unit are stacked in the same posture; Every two stacking units are stacked into a stacking section, and the postures of the two stacking units in the same stacking section are opposite; The stacking parts are stacked together to form a battery cell stack.

12. A battery module, characterized in that: A battery cell stack comprising any one of claims 1 to 11, and A shell body, provided with a cavity for accommodating the battery cell stack, and one end of the shell body is open; A cover plate is installed at one open end of the shell, and a through hole is provided on the cover plate. Each of the electrodes in the battery cell stack protrudes out of the outer side of the cover plate through the through hole.

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