Battery module

Abstract

The embodiment of the utility model provides a battery module. The battery module comprises: a battery module; the plurality of battery cells are linearly arranged and are connected in series; the battery pack assembly comprises an upper cover and a bottom shell, the upper cover and the bottom shell are connected to form an embedded cavity, and a plurality of battery cells are mounted in the embedded cavity; the protection plate assembly is fixed between the multiple battery cells and the upper cover, the two ends of the protection plate assembly are electrically connected with the multiple battery cells, and the size of the orthographic projection of the protection plate assembly in the first direction (Y) is smaller than that of the orthographic projection of the battery cells in the first direction (Y). Therefore, the plurality of battery cells can be connected and fixed through the upper cover and the bottom shell, and the side parts of the plurality of battery cells are not coated by the battery pack assembly, so that the space occupied by the battery pack assembly can be saved, the space occupied by the protection plate assembly can be reduced, and the space occupied by the whole battery module is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a battery module. Background Art

[0002] With the global low-carbonization and environmental protection, green travel has become more and more popular among consumers, and smart travel products are becoming more and more integrated into our lives. The demand for battery modules and related products is also increasing, and the requirements for battery module endurance, reliability, and safety are becoming higher and higher. Among them, when the battery module needs to be installed in some relatively narrow environments, the space occupied by the battery module needs to be reduced as much as possible.

[0003] At present, the battery module includes a plurality of battery cells arranged linearly and then wrapped by a tubular battery pack. However, the direct wrapping by the tubular battery pack results in a larger space occupied by the battery module as a whole. Utility Model Content

[0004] In order to solve or partially solve the above problems, the utility model discloses a battery module to solve the problem that the battery module occupies a large space in the prior art.

[0005] In order to solve the above problems, the embodiment of the utility model provides a battery module, the battery module comprising:

[0006] A plurality of linearly arranged battery cells, wherein the plurality of battery cells are connected in series;

[0007] A battery pack assembly, the battery pack assembly comprising an upper cover and a bottom shell, the upper cover and the bottom shell are connected to form an embedded cavity, and a plurality of the battery cells are installed in the embedded cavity;

[0008] A protection plate assembly, wherein the protection plate assembly is fixed between the plurality of battery cells and the upper cover, and both ends of the protection plate assembly are electrically connected to the plurality of battery cells, wherein the size of the orthographic projection of the protection plate assembly in a first direction (Y) is smaller than the size of the orthographic projection of the battery cells in the first direction (Y), wherein the first direction (Y) is the width direction of the protection plate assembly.

[0009] Optionally, a connection point between the upper cover and the bottom shell is located at least between two adjacent battery cells.

[0010] Optionally, a plurality of the battery cells are connected in series via series electrodes, the connection point between the upper cover and the bottom shell is located on the series electrodes between each two adjacent battery cells or on the series electrodes at the ends of the battery cells, and the protection plate assembly is electrically connected to the battery cells via the series electrodes.

[0011] Optionally, the battery module further includes a protection plate assembly, wherein the protection plate assembly is fixed between the plurality of battery cells and the upper cover, and the protection plate assembly is electrically connected to the battery cells via the series-connected electrodes.

[0012] Optionally, the series-connected pole pieces disposed at the ends of the plurality of battery cells arranged linearly are positive electrode spring pieces;

[0013] The positive electrode spring sheet includes a metal welding sheet and a metal spring arm, wherein the metal spring arm is arranged at the end of the metal welding sheet close to the upper cover, and the metal welding sheet is connected to the end of the battery cell;

[0014] The metal elastic arm includes two first elastic sheets and a second elastic sheet arranged at intervals along a second direction (Z), and the positive electrode of the protective plate assembly is electrically connected between the first elastic sheet and the second elastic sheet, wherein the second direction (Z) is a direction intersecting with the plane where the upper cover is located.

[0015] Optionally, the series-connected pole pieces located between two adjacent battery cells include a first pole piece and a second pole piece;

[0016] The first pole piece includes a connected negative electrode connecting piece and a negative electrode elastic arm, and the second pole piece includes a connected positive electrode connecting piece and a positive electrode elastic arm;

[0017] The negative electrode connecting piece is connected to the negative electrode of one of the two adjacent battery cells, and the positive electrode connecting piece is connected to the positive electrode of the other of the two adjacent battery cells;

[0018] The positive electrode spring arm and the negative electrode spring arm are stacked, and the negative electrode spring arm contacts the contact plate at the bottom of the protection plate assembly.

[0019] Optionally, a plurality of spaced connection posts are provided on the surface of the bottom shell facing the upper cover, and one battery cell is installed between every two adjacent connection posts;

[0020] The negative electrode elastic arm and the positive electrode elastic arm are stacked at the end of the connecting column;

[0021] The upper cover and the bottom shell are detachably connected through the negative electrode elastic arm, the positive electrode elastic arm and the connecting column.

[0022] Optionally, the negative electrode elastic arm is provided with a first threaded hole, the positive electrode elastic arm is provided with a second threaded hole, the upper cover is provided with a third threaded hole, the connecting column is provided with a fourth threaded hole, and the protective plate assembly is provided with a fifth threaded hole;

[0023] In the second direction (Z), the third threaded hole, the fifth threaded hole, the second threaded hole, the first threaded hole and the fourth threaded hole are aligned, and the battery module also includes a bolt, which passes through the third threaded hole, the fifth threaded hole, the second threaded hole, the first threaded hole and the fourth threaded hole in sequence, wherein the second direction (Z) is a direction intersecting with the plane where the upper cover is located.

[0024] Optionally, the positive electrode elastic arm includes at least one convex hull structure, and the positive electrode elastic arm constitutes a wavy plate-like structure.

[0025] Optionally, the spacing between the first spring sheet and the second spring sheet in the second direction (Z) is a first size, the size of the protective plate assembly in the second direction is a second size, the first size is smaller than the second size, and the difference between the first size and the second size is greater than or equal to 0.2 mm.

[0026] Optionally, the protection plate assembly includes a first surface facing the battery cell and a second surface facing the upper cover;

[0027] The first surface is provided with a plurality of contact pads, which are arranged around the fifth threaded hole. The second surface is provided with lead wire pads and an electronic component wiring area, which is located between two adjacent fifth threaded holes or between the fifth threaded hole and the lead wire pad.

[0028] In the embodiment of the utility model, since multiple linearly arranged battery cells are connected in series, when the battery pack assembly is set to cover the multiple battery cells, it is only necessary to cover the top and bottom of the multiple linearly arranged battery cells, so that the strength of the battery pack assembly can be ensured. In addition, since the battery pack assembly includes an upper cover and a bottom shell, the upper cover and the bottom shell are connected to form an embedded cavity, and multiple battery cells are installed in the embedded cavity, the top and bottom of the battery cells are respectively covered by the upper cover and the bottom shell along the linear arrangement direction of the battery cells, so that the multiple battery cells can be connected and fixed, and since the sides of the multiple battery cells are not covered by the battery pack assembly, the space occupied by the battery pack assembly can be saved. In addition, since the protection plate assembly is fixed between the multiple battery cells and the upper cover, and the two ends of the protection plate assembly are electrically connected to the multiple battery cells, the space occupied by the protection plate assembly can be reduced, and the space occupied by the entire battery module can be further reduced, which is conducive to the lightweight design of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is one of the schematic diagrams of a battery module structure provided by an embodiment of the utility model;

[0031] Figure 2 This is a second schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0032] Figure 3 This is a third schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0033] Figure 4 This is a fourth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0034] Figure 5 This is a fifth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0035] Figure 6 This is a sixth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0036] Figure 7 This is the seventh schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0037] Figure 8 This is an eighth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0038] Fig. 9 This is a ninth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0039] Fig.10 This is a tenth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0040] Fig.11 This is a schematic diagram of a battery module structure provided by an embodiment of the utility model.

[0041] Fig.12 This is a twelfth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0042] Fig.13 This is a thirteenth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0043] Fig.14 This is a fourteenth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0044] Fig.15 This is the fifteenth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0045] Fig.16 This is a sixteenth schematic diagram of a battery module structure provided by an embodiment of the utility model;

[0046] Fig.17 This is the seventeenth schematic diagram of a battery module structure provided in an embodiment of the present utility model.

[0047] Description of reference numerals:

[0048] 1-battery cell; 2-battery pack assembly; 3-series pole piece; 4-protection board assembly; 21-upper cover; 22-bottom shell; 31-positive electrode spring piece; 32-first pole piece; 33-second pole piece; 41-first surface; 42-second surface; 43-contact plate; 44-lead wire pad; 45-electronic component wiring area; 221-connecting column; 311-metal welding piece; 312-metal elastic arm; 321-negative electrode connecting piece; 322-negative electrode elastic arm; 331-positive electrode connecting piece; 332-positive electrode elastic arm; 3121-first spring piece; 3122-second spring piece. DETAILED DESCRIPTION

[0049] 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.

[0050] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0051] like Figures 1 to 17 As shown, the battery module includes:

[0052] A plurality of battery cells 1 are arranged linearly, and the plurality of battery cells 1 are connected in series.

[0053] A battery pack assembly 2, the battery pack assembly 2 comprises an upper cover 21 and a bottom shell 22, the upper cover 21 and the bottom shell 22 are connected to form an embedded cavity, and a plurality of battery cells 1 are installed in the embedded cavity;

[0054] The protection plate assembly 4 is fixed between the multiple battery cells 1 and the upper cover 21, and the two ends of the protection plate assembly 4 are electrically connected to the multiple battery cells 1, wherein the size of the orthographic projection of the protection plate assembly 4 in the first direction (Y) is smaller than the size of the orthographic projection of the battery cell 1 in the first direction (Y), wherein the first direction (Y) is the width direction of the protection plate assembly 4.

[0055] It can be seen from the above embodiments that in the embodiments of the utility model, since multiple linearly arranged battery cells 1 are connected in series, when the battery pack assembly 2 is provided to cover the multiple battery cells 1, it is only necessary to cover the top and bottom of the multiple linearly arranged battery cells 1, so that the strength of the battery pack assembly 2 can be ensured. In addition, since the battery pack assembly 2 includes an upper cover 21 and a bottom shell 22, the upper cover 21 and the bottom shell 22 are connected to form an embedded cavity, and multiple battery cells 1 are installed in the embedded cavity, so the upper cover 21 and the bottom shell 22 are respectively covered along the linear arrangement direction of the battery cells 1. The top and bottom of the battery cells 1 can be connected and fixed, and since the sides of the multiple battery cells 1 are not covered by the battery pack assembly 2, the space occupied by the battery pack assembly 2 can be saved. Since the protection board assembly 4 is fixed between the multiple battery cells 1 and the upper cover 21, and the two ends of the protection board assembly 4 are electrically connected to the multiple battery cells 1, the space occupied by the protection board assembly 4 can be reduced, and the space occupied by the entire battery module can be further reduced, which is beneficial to the lightweight design of the battery module.

[0056] Among them, in the above embodiments, each battery cell 1 can be a cylindrical battery cell 1, or a square columnar battery cell 1, or a battery cell 1 of other shapes, which is not limited in the embodiments of the present invention. The multiple battery cells 1 are connected in series, so that the multiple battery cells 1 are arranged linearly. The number of battery cells 1 included in the embodiments of the present invention is determined according to the energy required by the battery module, which is not limited in the embodiments of the present invention.

[0057] It should be noted that since the multiple battery cells 1 are arranged linearly, the structure of the battery pack assembly 2 needs to be able to wrap the multiple linearly arranged battery cells 1. In other words, at least two surfaces of the multiple linearly arranged battery cells 1 need to be covered by the battery pack assembly 2 so as to position and fix the multiple battery cells 1 through the battery pack assembly 2.

[0058] In the embodiment of the present utility model, Figure 3 and Figure 8As shown, the battery pack assembly 2 includes an upper cover 21 and a bottom shell 22. The upper cover 21 may be a rectangular plate-like structure, a circular plate-like structure, or other plate-like structures, which is not limited in the embodiment of the utility model. The bottom shell 22 may be a plate-like structure covering the bottom of multiple battery cells 1, and the bottom shell 22 may also simultaneously cover the two ends of the extension direction of multiple battery cells 1. In some embodiments, the bottom shell 22 may include a bottom plate, a first side plate and a second side plate, the first side plate and the second side plate are respectively fixed to the two ends of the bottom plate in the third direction (X), the first side plate and the second side plate are arranged opposite to each other, and the first side plate, the second side plate and the bottom plate form a U-shaped frame structure. In this way, the bottom of multiple battery cells 1 can be covered by the bottom plate, and the two ends of multiple battery cells 1 in the third direction (X) can be covered by the first side plate and the second side plate. In addition, in order to maximize the coverage area of ​​the bottom plate, illustratively, taking the battery cell 1 as a cylindrical battery cell 1, the surface of the bottom plate facing the upper cover 21 can be an arc-shaped surface, and the arc-shaped surface is concave in the direction away from the upper cover 21, so that the surface of the battery cell 1 and the surface of the bottom plate facing the upper cover 21 can be more closely matched. Among them, the third direction (X) is consistent with the linear arrangement direction of the multiple battery cells 1, that is, the third direction (X) is consistent with the extension direction of the multiple battery cells 1.

[0059] It should be noted that if Figure 7 As shown, the maximum dimension (d2) of the embedded cavity formed by the connection between the upper cover 21 and the bottom shell 22 in the first direction (Y) should be equal to the dimension (d1) of the battery cell 1 in the first direction (Y), that is, the maximum dimension (d2) of the battery pack assembly 2 in the first direction (Y) should be equal to the dimension (d1) of the battery cell 1 in the first direction (Y). Exemplarily, taking the battery cell 1 as a cylindrical battery cell 1 as an example, the maximum dimension of the battery pack assembly 2 in the first direction (Y) should be equal to the diameter of the battery cell 1. In this way, the space occupied by the battery module as a whole is long and narrow, and the dimension of the battery module in the first direction (Y) can be minimized, reducing the space occupied by the entire battery module, thereby meeting the installation requirements of the battery module under limited installation space in certain installation scenarios. Among them, the first direction (Y) is a direction that intersects with the second direction (Z) and the third direction (X) at the same time.

[0060] It should be noted that according to Figure 1In the embodiment of the utility model, the X-axis direction and the Z-axis direction intersect, and the first direction (Y) intersects with the second direction (Z) and the third direction (X) at the same time. For the convenience of explanation, the second direction is defined as the Z-axis direction, the second direction is defined as the X-axis direction (that is, the linear arrangement direction of the multiple battery cells 1 in the embodiment of the utility model or the extension direction of the multiple battery cells 1), and the first direction is defined as the Y-axis direction. Further explanation, the definition of vertical in the specification should be understood as vertical within a 10% fluctuation of 90 degrees, that is, the angle between the defined second direction and the second direction should be understood as vertical if it is between 80 degrees and 90 degrees.

[0061] In some embodiments, the connection point between the upper cover 21 and the bottom shell 22 is located at least between two adjacent battery cells 1. In this way, while the strength of the battery pack assembly 2 is increased by the connection point between the upper cover 21 and the bottom shell 22, the space occupied by the battery pack assembly 2 will not be increased due to the connection point between the upper cover 21 and the bottom shell 22. In summary, the battery module provided by the embodiment of the utility model can reduce the space occupied by the entire battery module while ensuring the strength of the battery pack assembly 2, which is conducive to the lightweight design of the battery module.

[0062] Next, the electrical connection method and specific structure between the multiple battery cells 1 provided in the embodiment of the utility model are specifically introduced:

[0063] In some embodiments, Figure 4 and Figure 6 As shown, multiple battery cells 1 are connected in series via series electrodes 3, the connection point between the upper cover 21 and the bottom shell 22 is located on the series electrodes 3 between each two adjacent battery cells 1 or on the series electrodes 3 at the ends of the battery cells 1, and the protection board assembly 4 is electrically connected to the battery cells 1 via the series electrodes 3.

[0064] In this embodiment, the series electrode 3 can be welded to the two ends of the battery cell 1 as the electrode ears of the battery cell 1. In this way, the multiple battery cells 1 are connected in series through the series electrode 3, which not only meets the electrical connection requirements between the multiple battery cells 1, but also because the connection point between the upper cover 21 and the bottom shell 22 is located on the series electrode 3 between each adjacent two battery cells 1 or on the series electrode 3 at the end of the battery cell 1, the setting of the series electrode 3 will not affect the overall size of the battery pack assembly 2, that is, the series electrode 3 will not affect the space occupied by the entire battery module.

[0065] Further, such as Fig.11 As shown, the battery module further includes a protection board assembly 4 , which is fixed between the plurality of battery cells 1 and the upper cover 21 , and the protection board assembly 4 is electrically connected to the battery cells 1 via the series-connected pole pieces 3 .

[0066] It should be noted that, since the material of the battery cell 1 itself determines that the battery cell 1 cannot be overcharged, over-discharged, over-currented, short-circuited, or charged and discharged at ultra-high temperatures, the battery cell 1 needs to be protected by a protection board with a sampling resistor, and the protection board assembly 4 is a basic circuit board that protects the charging and discharging of the battery cell 1. In this way, since the protection board assembly 4 is fixed between the multiple battery cells 1 and the upper cover 21, the protection board assembly 4 is electrically connected to the battery cell 1 through the series electrode 3, so that not only can the battery cell 1 be protected by the protection board assembly 4, but also the protection board assembly 4 can be connected through the series electrode 3, and the outlet position of the protection board assembly 4 will not be affected, and the space occupied by the battery module as a whole will not be affected by the setting of the protection board assembly 4.

[0067] In some possible embodiments, such as Figure 4 , Figure 6 , Fig. 9 , Fig.12 and Fig.13 As shown, Fig.13 yes Fig.12 A partial enlarged schematic diagram at A. For the electrical connection between the protection plate assembly 4 and the battery cell 1, the series electrode 3 arranged at the end of the plurality of battery cells 1 arranged linearly is a positive spring piece 31; the positive spring piece 31 includes a metal welding piece 311 and a metal spring arm 312, the metal spring arm 312 is arranged at the end of the metal welding piece 311 close to the upper cover 21, and the metal welding piece 311 is connected to the end of the battery cell 1; the metal spring arm 312 includes two first spring pieces 3121 and second spring pieces 3122 arranged at intervals along the second direction (Z), and the positive electrode of the protection plate assembly 4 is electrically connected between the first spring piece 3121 and the second spring piece 3122, wherein the second direction (Z) is a direction intersecting with the plane where the upper cover 21 is located.

[0068] It should be noted that, in this embodiment, the positive electrode spring piece 31 is connected to the ends of multiple linearly arranged battery cells 1, that is, the positive electrode spring piece 31 is connected to the positive electrode of the linearly arranged battery cells 1. Among them, the metal welding sheet 311 is used for spot welding with the battery cell 1, thereby connecting the positive electrodes of multiple battery cells 1. The metal welding sheet 311 can be a metal material with high conductivity and easy to weld. The metal elastic arm 312 is used to electrically connect to the metal welding sheet 311, and is also used to conduct the positive electrode of the protection plate assembly 4 at an angle. In the embodiment of the utility model, the metal spring arm 312 includes two first spring pieces 3121 and second spring pieces 3122 arranged at intervals along the second direction (Z), the positive electrode of the protection plate assembly 4 is electrically connected between the first spring piece 3121 and the second spring piece 3122, and then the protection plate assembly 4 is clamped by the first spring piece 3121 and the second spring piece 3122, thereby ensuring the electrical connection between the positive electrode of the battery cell 1 and the positive electrode of the protection plate assembly 4, and the material of the first spring piece 3121 and the material of the second spring piece 3122 can be a metal material with elasticity. Exemplarily, the metal welding sheet 311 is nickel, and the first spring piece 3121 and the second spring piece 3122 are copper. It should also be noted that in order to ensure the tightness of the connection between the first spring piece 3121 and the protection plate assembly 4, and to ensure the tightness of the connection between the second spring piece 3122 and the protection plate assembly 4, the number of the first spring piece 3121 and the number of the second spring piece 3122 can be multiple, so as to increase the clamping points between the first spring piece 3121 and the second spring piece 3122 and the protection plate assembly 4. In addition, the first spring clip 3121 and the second spring clip 3122 are wavy spring clips, which can increase the elasticity of the first spring clip 3121 and the second spring clip 3122, thereby increasing the tightness of the connection between the first spring clip 3121 and the protective plate assembly 4, and increasing the tightness of the connection between the second spring clip 3122 and the protective plate assembly 4.

[0069] Further, such as Fig.10 As shown, for the gap between the first spring clip 3121 and the second spring clip 3122, in some embodiments, the spacing between the first spring clip 3121 and the second spring clip 3122 in the second direction (Z) is a first dimension (d3), the dimension of the protection plate assembly 4 in the second direction is a second dimension, the first dimension is smaller than the second dimension, and the difference between the first dimension and the second dimension is greater than or equal to 0.2 mm.

[0070] In this embodiment, since the positive electrode of the protection plate assembly 4 is electrically connected between the first spring sheet 3121 and the second spring sheet 3122, the spacing between the first spring sheet 3121 and the second spring sheet 3122 in the second direction (Z) is a first dimension, and the dimension of the protection plate assembly 4 in the second direction is a second dimension, the first dimension is smaller than the second dimension, and the difference between the first dimension and the second dimension is greater than or equal to 0.2 mm. After the protection plate assembly 4 is fixed between the first spring sheet 3121 and the second spring sheet 3122, the first spring sheet 3121 and the second spring sheet 3122 can be squeezed and deformed, thereby increasing the force between the first spring sheet 3121 and the protection plate assembly 4, and increasing the force between the second spring sheet 3122 and the protection plate assembly 4, thereby further increasing the tightness of the connection between the first spring sheet 3121 and the protection plate assembly 4, and increasing the tightness of the connection between the second spring sheet 3122 and the protection plate assembly 4.

[0071] In other feasible embodiments, such as Figure 4 , Figure 5 , Figure 6 , Fig.14 and Fig.15 As shown, Fig.15 yes Fig.14 A partial enlarged schematic diagram at B. For the electrical connection between the protection plate assembly 4 and the battery cell 1, the series electrode sheet 3 located between two adjacent battery cells 1 includes a first electrode sheet 32 ​​and a second electrode sheet 33; the first electrode sheet 32 ​​includes a connected negative electrode connecting sheet 321 and a negative electrode elastic arm 322, and the second electrode sheet 33 includes a connected positive electrode connecting sheet 331 and a positive electrode elastic arm 332; the negative electrode connecting sheet 321 is connected to the negative electrode of one of the two adjacent battery cells 1, and the positive electrode connecting sheet 331 is connected to the positive electrode of the other of the two adjacent battery cells 1; the positive electrode elastic arm 332 and the negative electrode elastic arm 322 are stacked, and the negative electrode elastic arm 322 is in contact with the contact plate 43 at the bottom of the protection plate assembly 4.

[0072] It should be noted that the negative electrode connecting piece 321 is used for spot welding with the negative electrode of the battery cell 1 as the negative electrode tab of the battery cell 1, and the positive electrode connecting piece 331 is used for spot welding with the positive electrode of the battery cell 1 as the positive electrode tab of the battery cell 1. Since the negative electrode connecting piece 321 and the negative electrode elastic arm 322 are connected as an integral structure, and the positive electrode connecting piece 331 and the positive electrode elastic arm 332 are connected as an integral structure, the positive electrode tab of the battery cell 1 can be extended to the positive electrode elastic arm 332, and the negative electrode tab of the battery cell 1 can be extended to the negative electrode elastic arm 322. In this way, when the positive electrode elastic arm 332 and the negative electrode elastic arm 322 are stacked and the negative electrode elastic arm 322 is in contact with the contact plate 43 at the bottom of the protection plate assembly 4, the electrical connection point between each two adjacent battery cells 1 can be electrically connected to the protection plate assembly 4. In other words, not only can the battery cells 1 and the battery cells 1 be connected and conducted without welding, but the battery cells 1 and the protection plate assembly 4 can also be connected and conducted without welding. In this way, the welding process between the battery cells 1 and the battery cells 1 and the protection plate assembly 4 can be omitted, thereby reducing the production cost of the battery module.

[0073] Optionally, for the structure of the positive electrode elastic arm 332, in some embodiments, the positive electrode elastic arm 332 includes at least one convex hull structure, and the positive electrode elastic arm 332 forms a wavy plate-like structure. In this embodiment, the convex hull structure is an arc-shaped convex hull structure, so that the connection between multiple convex hull structures can make the positive electrode elastic arm 332 form a wavy plate-like structure, and when the battery cell 1 and the protection plate assembly 4 are subsequently connected through the series electrode sheet 3, the positive electrode elastic arm 332 can be deformed to a certain extent, which is more conducive to locking and fixing the battery cell 1 and the protection plate assembly 4.

[0074] In some embodiments, for the connection between the upper cover 21 and the bottom shell 22, a plurality of spaced connection posts 221 are provided on the surface of the bottom shell 22 facing the upper cover 21, and a battery cell 1 is installed between each two adjacent connection posts 221; the negative electrode elastic arm 322 and the positive electrode elastic arm 332 are stacked at the ends of the connection posts 221; the upper cover 21 and the bottom shell 22 are detachably connected through the negative electrode elastic arm 322, the positive electrode elastic arm 332 and the connection post 221.

[0075] It should be noted that the distance between each two adjacent connecting posts 221 should be greater than the size of the battery cell 1 in the third direction (X), and the difference between the distance between each two adjacent connecting posts 221 and the size of the battery cell 1 in the third direction (X) should tend to zero. In this way, when a battery cell 1 is installed between each two adjacent connecting posts 221, not only can the battery cell 1 be installed between each two adjacent connecting posts 221, but also the battery cell 1 can be limited in the third direction (X) by the connecting posts 221. In addition, since the negative electrode elastic arm 322 and the positive electrode elastic arm 332 are stacked at the end of the connecting post 221, the upper cover 21 and the bottom shell 22 are detachably connected through the negative electrode elastic arm 322, the positive electrode elastic arm 332 and the connecting post 221, so that the connection point between the upper cover 21 and the bottom shell 22 can be located between each two adjacent battery cells 1, avoiding the increase of the space occupied by the battery pack assembly 2 due to the connection point between the upper cover 21 and the bottom shell 22. The upper cover 21 and the bottom shell 22 can be detachably connected by means of snap connection, bolt connection, riveting, etc., so as to facilitate the assembly and disassembly of the upper cover 21 and the bottom shell 22.

[0076] Optionally, for the detachable connection between the upper cover 21 and the bottom shell 22, in some embodiments, a first threaded hole is provided on the negative electrode elastic arm 322, a second threaded hole is provided on the positive electrode elastic arm 332, a third threaded hole is provided on the upper cover 21, a fourth threaded hole is provided on the connecting column 221, and a fifth threaded hole is provided on the protective plate assembly 4; in the second direction (Z), the third threaded hole, the fifth threaded hole, the second threaded hole, the first threaded hole and the fourth threaded hole are aligned, and the battery module also includes a bolt, which passes through the third threaded hole, the fifth threaded hole, the second threaded hole, the first threaded hole and the fourth threaded hole in sequence, wherein the second direction (Z) is a direction intersecting with the plane where the upper cover 21 is located.

[0077] It should be noted that by passing the bolts through the third threaded hole, the fifth threaded hole, the second threaded hole, the first threaded hole and the fourth threaded hole in sequence, the upper cover 21, the protection plate assembly 4, the battery cell 1 and the bottom shell 22 can be threadedly connected. Without adding connecting parts, a detachable connection between the upper cover 21, the protection plate assembly 4, the battery cell 1 and the bottom shell 22 can be achieved, which facilitates the disassembly and assembly of the battery module and helps to reduce the volume of the entire battery module.

[0078] Regarding the structure of the protection plate assembly 4, in some embodiments, as Fig.16 and Fig.17As shown, the protection plate assembly 4 includes a first surface 41 facing the battery cell 1 and a second surface 42 facing the upper cover 21; the first surface 41 is provided with a plurality of contact pads 43, and the contact pads 43 are arranged around the fifth threaded hole; the second surface 42 is provided with a lead wire pad 44 and an electronic component wiring area 45, and the electronic component wiring area 45 is located between two adjacent fifth threaded holes or between the fifth threaded hole and the lead wire pad 44.

[0079] It should be noted that the lead wire pad 44 can realize the electrical connection of the electronic devices on the protection board assembly 4 in the circuit, and can enable the external electronic components to be connected to the protection board assembly 4, thereby preventing them from falling off. In addition, since the first surface 41 of the protection board assembly 4 is provided with a plurality of contact pads 43, and the contact pads 43 are arranged around the fifth threaded hole, the protection board assembly 4 and the battery cell 1 are conveniently connected and conducted through the contact pads 43, and the protection board assembly 4 is conveniently connected. At the same time, since the second surface 42 is provided with a lead wire pad 44 and an electronic component wiring area 45, and the electronic component wiring area 45 is located between two adjacent fifth threaded holes or between the fifth threaded hole and the lead wire pad 44, the electronic component wiring area 45 can be located between the upper cover 21 and the protection board body, and then the electronic component wiring area 45 can be protected by the upper cover 21, and the structural integrity of the electronic component wiring area 45 can be ensured.

[0080] It can be seen from the above embodiments that in the embodiments of the utility model, since multiple linearly arranged battery cells 1 are connected in series, when the battery pack assembly 2 is provided to cover the multiple battery cells 1, it is only necessary to cover the top and bottom of the multiple linearly arranged battery cells 1, so that the strength of the battery pack assembly 2 can be ensured. In addition, since the battery pack assembly 2 includes an upper cover 21 and a bottom shell 22, the upper cover 21 and the bottom shell 22 are connected to form an embedded cavity, and multiple battery cells 1 are installed in the embedded cavity, so the upper cover 21 and the bottom shell 22 are respectively covered along the linear arrangement direction of the battery cells 1. The top and bottom of the battery cells 1 can be connected and fixed, and since the sides of the multiple battery cells 1 are not covered by the battery pack assembly 2, the space occupied by the battery pack assembly 2 can be saved. Since the protection board assembly 4 is fixed between the multiple battery cells 1 and the upper cover 21, and the two ends of the protection board assembly 4 are electrically connected to the multiple battery cells 1, the space occupied by the protection board assembly 4 can be reduced, and the space occupied by the entire battery module can be further reduced, which is beneficial to the lightweight design of the battery module.

[0081] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0082] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0083] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0084] The utility model has been introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for general technicians in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A battery module, characterized in that: The battery module comprises: A plurality of linearly arranged battery cells (1), wherein the plurality of battery cells (1) are connected in series; A battery pack assembly (2), the battery pack assembly (2) comprising an upper cover (21) and a bottom shell (22), the upper cover (21) and the bottom shell (22) being connected to form an embedding cavity, and a plurality of the battery cells (1) being installed in the embedding cavity; A protective plate assembly (4), wherein the protective plate assembly (4) is fixed between the plurality of battery cells (1) and the upper cover (21), and the two ends of the protective plate assembly (4) are electrically connected to the plurality of battery cells (1), wherein the size of the orthographic projection of the protective plate assembly (4) in a first direction (Y) is smaller than the size of the orthographic projection of the battery cell (1) in the first direction (Y), and wherein the first direction (Y) is the width direction of the protective plate assembly (4).

2. The battery module according to claim 1, characterized in that: The connection point between the upper cover (21) and the bottom shell (22) is located at least between two adjacent battery cells (1).

3. The battery module according to claim 1, characterized in that: The plurality of battery cells (1) are connected in series via series electrodes (3); the connection point between the upper cover (21) and the bottom shell (22) is located on the series electrodes (3) between each two adjacent battery cells (1) or on the series electrodes (3) at the ends of the battery cells (1); and the protection plate assembly (4) is electrically connected to the battery cells (1) via the series electrodes (3).

4. The battery module according to claim 3, characterized in that: The series-connected pole pieces (3) arranged at the ends of the plurality of battery cells (1) arranged linearly are positive pole spring pieces (31); The positive electrode spring sheet (31) comprises a metal welding sheet (311) and a metal spring arm (312), wherein the metal spring arm (312) is arranged at an end of the metal welding sheet (311) close to the upper cover (21), and the metal welding sheet (311) is connected to an end of the battery cell (1); The metal elastic arm (312) comprises a first elastic sheet (3121) and a second elastic sheet which are spaced apart along a second direction (Z), and the positive electrode of the protection plate assembly (4) is electrically connected between the first elastic sheet (3121) and the second elastic sheet, wherein the second direction (Z) is a direction intersecting with the plane where the upper cover (21) is located.

5. The battery module according to claim 3, characterized in that: The series-connected pole piece (3) located between two adjacent battery cells (1) comprises a first pole piece (32) and a second pole piece (33); The first pole piece (32) comprises a connected negative pole connecting piece (321) and a negative pole elastic arm (322), and the second pole piece (33) comprises a connected positive pole connecting piece (331) and a positive pole elastic arm (332); The negative electrode connecting piece (321) is connected to the negative electrode of one of the two adjacent battery cells (1), and the positive electrode connecting piece (331) is connected to the positive electrode of the other of the two adjacent battery cells (1); The positive electrode elastic arm (332) and the negative electrode elastic arm (322) are stacked, and the negative electrode elastic arm (322) is in contact with the contact plate (43) at the bottom of the protection plate assembly (4).

6. The battery module according to claim 5, characterized in that: A plurality of spaced-apart connection posts (221) are provided on the surface of the bottom shell (22) facing the upper cover (21), and one of the battery cells (1) is installed between every two adjacent connection posts (221); The negative electrode elastic arm (322) and the positive electrode elastic arm (332) are stacked and arranged at the end of the connecting column (221); The upper cover (21) and the bottom shell (22) are detachably connected via the negative electrode elastic arm (322), the positive electrode elastic arm (332) and the connecting column (221).

7. The battery module according to claim 6, characterized in that: The negative electrode elastic arm (322) is provided with a first threaded hole, the positive electrode elastic arm (332) is provided with a second threaded hole, the upper cover (21) is provided with a third threaded hole, the connecting column (221) is provided with a fourth threaded hole, and the protective plate assembly (4) is provided with a fifth threaded hole; In the second direction (Z), the third threaded hole, the fifth threaded hole, the second threaded hole, the first threaded hole and the fourth threaded hole are aligned, and the battery module also includes a bolt, which passes through the third threaded hole, the fifth threaded hole, the second threaded hole, the first threaded hole and the fourth threaded hole in sequence, wherein the second direction (Z) is a direction intersecting with the plane where the upper cover (21) is located.

8. The battery module according to claim 5, characterized in that: The positive electrode elastic arm (332) comprises at least one convex hull structure, and the positive electrode elastic arm (332) forms a wavy plate-shaped structure.

9. The battery module according to claim 4, characterized in that: The spacing between the first spring sheet (3121) and the second spring sheet in the second direction (Z) is a first size, the size of the protection plate assembly (4) in the second direction (Z) is a second size, the first size is smaller than the second size, and the difference between the first size and the second size is greater than or equal to 0.2 mm.

10. The battery module according to claim 7, characterized in that: The protection plate assembly (4) comprises a first surface (41) facing the battery cell (1) and a second surface (42) facing the upper cover (21); The first surface (41) is provided with a plurality of contact pads (43), and the contact pads (43) are arranged around the fifth threaded hole. The second surface (42) is provided with a lead wire pad (44) and an electronic component wiring area (45), and the electronic component wiring area (45) is located between two adjacent fifth threaded holes or between the fifth threaded hole and the lead wire pad (44).

Images