Soft package battery module and battery pack

Abstract

The invention discloses a soft package battery module which comprises a battery pack and an electric connecting piece, the battery pack comprises a first battery cell unit and a second battery cell unit which are oppositely arranged along a first direction, the first battery cell unit is provided with a plurality of first battery cells which are sequentially arranged and stacked along a second direction, and the second direction is perpendicular to the first direction; the second battery cell unit is provided with a plurality of second battery cells which are sequentially arranged and stacked along a second direction, and the first battery cells and the second battery cells are correspondingly arranged; the first battery cell is provided with a first tab, and the second battery cell is provided with a second tab; the first battery cells and the corresponding second battery cells are connected in parallel through the first tabs and the second tabs; a gap is formed between the first battery cell unit and the second battery cell unit in the first direction; the first tab, the second tab and the electric connecting piece are positioned in the gap; the first battery cells and the corresponding second battery cells form a plurality of battery cell groups, and the battery cell groups are connected in series through electric connecting pieces. The invention also discloses a battery pack. The module provided by the invention has the advantages of large capacity, high space utilization rate and cost saving.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a soft-pack battery module and a battery pack. Background Art

[0002] As the range of electric vehicles increases, the space utilization of battery packs is increasingly required to meet both large power demands and safety performance, prompting more and more designs to develop in the direction of high integration.

[0003] The soft-pack battery module is formed by a series-parallel combination of several soft-pack battery cells (hereinafter referred to as battery cells). The grouping method in the prior art is to stack multiple battery cells, overlap the pole ears of adjacent battery cells, weld the pole ears through welding process equipment to connect several battery cells in series into a battery pack, and arrange the electrical connector around one side of the battery grouping direction to connect the head and tail battery cells in series to form a soft-pack battery module with a series circuit. However, the soft-pack battery module obtained by the above grouping method has limited capacity and low space utilization.

[0004] Therefore, it is necessary to develop a soft-pack battery module with large capacity and high space utilization. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a soft-pack battery module and a battery pack.

[0006] In a first aspect, an embodiment of the present invention discloses a soft-pack battery module, including a battery pack and an electrical connector, wherein the battery pack includes a first battery cell unit and a second battery cell unit arranged opposite to each other along a first direction, wherein the first battery cell unit has a plurality of first battery cells sequentially arranged and stacked along a second direction, wherein the second direction is perpendicular to the first direction, and the second battery cell unit has a plurality of second battery cells sequentially arranged and stacked along the second direction, wherein the first battery cell and the second battery cell are arranged correspondingly;

[0007] The first battery cell has a first pole tab, and the second battery cell has a second pole tab; the first battery cell and the corresponding second battery cell are connected in parallel through the first pole tab and the second pole tab;

[0008] The first battery cell unit and the second battery cell unit are spaced apart in the first direction, and the first pole lug, the second pole lug and the electrical connector are located in the space; the first battery cell and the corresponding second battery cell form a plurality of battery cell groups, and the plurality of battery cell groups are connected in series through the electrical connector.

[0009] The above technical solution can realize cell-level capacity expansion, effectively save space, improve the space utilization of soft-pack battery modules, and greatly reduce development costs.

[0010] Optionally, the electrical connector includes an L-shaped pole piece, and the L-shaped pole piece is used to clamp a portion where the first pole tab and the second pole tab are connected in parallel.

[0011] Optionally, the electrical connector also includes an integrated cover plate, the integrated cover plate includes a groove and a clip, the groove and the clip are arranged in sequence along a third direction, the third direction and the first direction and the second direction are perpendicular to each other, the clip is respectively clipped to the first pole ear and the second pole ear, and the height of the clip is the same as the height of the first pole ear and the height of the second pole ear.

[0012] Optionally, a groove bottom of the groove is provided with a plurality of rows of grooves spaced apart along the second direction, and the L-shaped pole piece is exposed through the rows of grooves.

[0013] Optionally, the electrical connector further comprises a wavy pole piece, wherein the wavy pole piece and the row groove are sequentially arranged along the third direction, and abut against the L-shaped pole piece through the row groove, and the plurality of battery cell groups are connected in series through the wavy pole piece.

[0014] Optionally, the electrical connector further includes a flexible circuit board, and a limiting groove is provided on a side surface of the groove along the first direction, and the flexible circuit board is accommodated in the limiting groove.

[0015] Optionally, the electrical connector also includes a mica protective plate and a mica protective layer, the integrated cover plate has a first end face and a second end face relatively arranged along the third direction, the mica protective plate and the first end face are fixedly connected, the mica protective layer and the second end face are fixedly connected, and the mica protective plate is provided with an exhaust hole.

[0016] Optionally, the electrical connector further includes a protective cover, the mica protective plate is provided with a high-voltage disconnecting opening, and the protective cover covers the high-voltage disconnecting opening along the third direction.

[0017] Optionally, the electrical connector further includes a bus bar, and the bus bar is arranged between the mica protective plate and the protective cover along the third direction.

[0018] In a second aspect, an embodiment of the present invention discloses a battery pack, comprising a soft-pack battery module according to any embodiment of the first aspect.

[0019] By adopting the above technical solution, the soft-pack battery module of the above design can be integrated to achieve high space utilization and good heat dissipation performance. Therefore, the battery pack can accommodate more cells within a limited volume, thereby providing higher energy density and longer battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1An exploded view of the structure of a soft-pack battery module according to an embodiment of the present invention is shown;

[0021] Figure 2 A partial enlarged schematic diagram showing the assembly of an L-shaped pole piece in a soft-pack battery module according to an embodiment of the present invention;

[0022] Figure 3 A cross-sectional schematic diagram of a soft-pack battery module according to an embodiment of the present invention is shown;

[0023] Figure 4 A partial top view schematic diagram of a soft-pack battery module according to an embodiment of the present invention is shown.

[0024] Explanation of symbols:

[0025] 1. First battery cell unit, 11. First battery cell, 111. First negative electrode tab, 112. First positive electrode tab, 2. Second battery cell unit, 21. Second battery cell, 211. Second negative electrode tab, 212. Second positive electrode tab

[0026] 31. L-shaped pole piece, 32. Integrated cover plate, 321. Groove, 3211. Row groove, 322. Snap-on, 33. Wave-shaped pole piece, 34. Flexible circuit board, 35. Mica protective plate, 351. Plastic screw, 352. Exhaust hole, 353. High-voltage disconnect port, 36. Mica protective layer, 37. Protective cover, 38. Busbar

[0027] x. First direction, y. Second direction, z. Third direction, A. Interval, B. Parts connected in parallel DETAILED DESCRIPTION

[0028] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0029] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0030] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0031] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] First, as Figure 1 As shown, an embodiment of the present invention provides a soft pack battery module, including a battery pack and an electrical connector, wherein the battery pack includes a first direction (eg Figure 1 The first battery cell unit 1 has a plurality of cells extending in the second direction (eg, Figure 1 The first cells 11 are stacked in sequence in the y direction, and the second direction (e.g. Figure 1 The y direction in the figure) is perpendicular to the first direction (e.g. Figure 1 The second battery cell unit 2 has a plurality of cells along the second direction (eg Figure 1 The second battery cells 21 are sequentially stacked in the y direction, the first battery cells 11 and the second battery cells 21 are correspondingly arranged, and further, the first battery cells 11 and the second battery cells 21 are arranged along the first direction (for example Figure 1 The x direction in the image is relative.

[0034] The first battery cell 11 has a first pole tab, and the second battery cell 21 has a second pole tab; wherein the first pole tab includes a first negative pole tab 111 and a first positive pole tab 112, and the second pole tab includes a second negative pole tab 211 and a second positive pole tab 212. The first battery cell 11 and the corresponding second battery cell 21 are connected in parallel through the first pole tab and the second pole tab; that is, the first pole tab and the second pole tab are connected in parallel to realize the parallel connection of the first battery cell 11 and the corresponding second battery cell 21. Specifically, the first negative pole tab 111 and the second negative pole tab 211 overlap each other, and the first positive pole tab 112 and the second positive pole tab 212 overlap each other, thereby realizing the parallel connection of the first pole tab and the second pole tab, thereby realizing the parallel connection of the first battery cell 11 and the corresponding second battery cell 21.

[0035] The first battery cell unit 1 and the second battery cell unit 2 are in a first direction (eg Figure 1 In the x direction in the figure, a gap A is provided, and the first pole tab 11, the second pole tab 21 and the electrical connector are located in the gap A. That is, the first pole tab 11 and the second pole tab 21 are arranged opposite to each other along the first direction, and the first battery cell 11 has a first negative pole tab 111 and a first positive pole tab 112 arranged on the same side on one side along the first direction, and the corresponding second battery cell 21 has a second negative pole tab 211 and a second positive pole tab 212 arranged on the same side on one side along the first direction, and the first negative pole tab 111 and the second negative pole tab 211 overlap each other in the gap A, and the first positive pole tab 112 and the second positive pole tab 212 overlap each other in the gap A. The first battery cell 11 and the corresponding second battery cell 21 form a plurality of battery cell groups, and the plurality of battery cell groups are connected by connecting the overlapping parts in series with the electrical connector located in the gap A.

[0036] By adopting the above technical scheme, the present invention effectively controls the overall size of the soft-pack battery module by arranging the first battery cell unit 1 and the second battery cell unit 2 relatively in the first direction and arranging and stacking them in sequence in the second direction, thereby realizing efficient arrangement of the battery cells in the battery module. The first battery cell 11 is also connected in parallel with the corresponding second battery cell 21, so that each battery cell can provide more charge together during discharge, thereby realizing the expansion of the battery cell level and significantly improving the overall capacity of the soft-pack battery module. At the same time, since the first battery cell unit 1 and the second battery cell unit 2 form a gap A in the first direction, the first pole ear 11, the second pole ear 21 and the electrical connector only need to be arranged in the gap A. When the first battery cell 11 and the corresponding second battery cell 21 form a plurality of battery cell groups, the plurality of battery cell groups are connected in series through the electrical connector located in the gap A to form a loop. The electrical connector is avoided from being electrically connected around the periphery of the first battery cell unit 1 and the second battery cell unit 2, thereby saving additional space occupation. And compared with the prior art, the positive pole ear and the negative pole ear of the battery cell are respectively arranged on both sides of the battery cell for series and parallel connection. The present invention greatly improves the space utilization rate of the soft-pack battery module and saves costs.

[0037] Combination Figure 1 and Figure 2 As shown, the electrical connector of the present invention includes an L-shaped pole piece 31, and the L-shaped pole piece 31 is used to clamp the portion B where the first pole ear and the second pole ear are connected in parallel. That is, the L-shaped pole piece 31 is used to clamp the portion where the first negative pole ear 111 and the second negative pole ear 211 overlap each other, and to clamp the portion where the first positive pole ear 112 and the second positive pole ear 212 overlap each other. Specifically, the L-shaped pole piece 31 and the first pole ear or the second pole ear are connected by welding. In this way, the first battery cell 11 and the second battery cell 21 are connected to achieve the expansion of the battery cell. Among them, the L-shaped pole piece 31 can be an Al pole piece. The present invention does not specifically limit the number of L-shaped pole pieces 31, and technicians can choose according to actual needs.

[0038] In this embodiment, the first battery cell 11 and the corresponding second battery cell 21 are connected in parallel to form a battery cell group, and adjacent battery cell groups are further connected in parallel to form a parallel group. Figure 2 As shown, a first battery cell 11 and a corresponding second battery cell 21 are connected in parallel to form a battery cell group, and two adjacent battery cell groups are connected in parallel. A battery cell group has an L-shaped pole piece 31, and the overlapping areas of the L-shaped pole pieces 31 in adjacent battery cell groups are connected by welding to form a parallel group. Therefore, by controlling the number of the first battery cell 11 and the second battery cell 21 in the parallel connection, the capacity of the soft-pack battery module that meets the user's needs can be designed. The present invention does not impose specific restrictions on the number of the first battery cell 11 and the second battery cell 21 in the battery cell group, and technicians can choose according to actual needs.

[0039] Continue to refer Figure 1 As shown, in this embodiment, the electrical connector further includes an integrated cover plate 32, the integrated cover plate 32 includes a groove 321 and a clamping member 322, the groove 321 and the clamping member 322 are arranged along the third direction (for example Figure 1 The third direction is perpendicular to the first direction and the second direction, that is, the first direction, the second direction and the third direction are perpendicular to each other. The clamping member 322 is clamped with the first pole ear and the second pole ear respectively, and the height of the clamping member 322 is the same as the height of the first pole ear and the height of the second pole ear. As a result, the integrated cover plate 32 plays the role of a support and an integration. By setting the integrated cover plate 32 to include a groove 321 and a clamping member 322, the groove 321 provides support for the layout of other components. The clamping member 322 is clamped with the first pole ear and the second pole ear respectively, providing stable support for the first pole ear and the second pole ear, and the setting of the clamping member 322 and the first pole ear and the second pole ear at the same height further avoids damage to the pole ears during assembly and use. Among them, the material of the integrated cover plate 32 can be ABS+PC (acrylonitrile-butadiene-styrene copolymer+polycarbonate).

[0040] Specifically, in this embodiment, there are two integrated cover plates 32 arranged opposite to each other along the third direction. Among them, the first negative electrode tab 111 and the corresponding second negative electrode tab 211 overlap each other to form a plurality of negative electrode tab groups, and the first positive electrode tab 112 and the corresponding second positive electrode tab 212 overlap each other to form a plurality of positive electrode tab groups, that is, the two integrated cover plates 32 are respectively clamped to the negative electrode tab group and the positive electrode tab group, further improving the reliability of use.

[0041] The inventors also considered that the place where the battery cell is most likely to experience thermal runaway is mainly at the pole ear. Further, the bottom of the groove 321 is provided with a plurality of rows of grooves 3211 (such as Figure 3As shown), the L-shaped pole piece 31 is exposed through the row groove 3211. The design of the row groove 3211 provides an effective gas guiding effect for the battery cell in the case of thermal runaway. When thermal runaway occurs inside the battery cell due to overheating or other reasons, a large amount of gas will be generated. If it is not discharged in time, the internal pressure will increase sharply, and then cause the battery to swell, rupture or even explode. Therefore, through the above-mentioned row groove 3211 and the positional relationship between the above-mentioned row groove 3211 and the pole ear, the first pole ear and the second pole ear have separate exhaust channels, and the thermal runaway gas is drained through the row groove 3211 and the exhaust hole 352, which is conducive to leading the thermal runaway gas out of the battery module, thereby improving the safety of the series expansion battery cell.

[0042] Combination Figure 1 and Figure 3 As shown, in this embodiment, the electrical connector also includes a wavy pole piece 33, and the wavy pole piece 33 and the row groove 3211 are arranged in sequence along the third direction, and the row groove 3211 abuts against the L-shaped pole piece 31, and multiple battery cell groups are connected in series through the wavy pole piece 33. Among them, the wavy pole piece 33 can be limited and fixed to the integrated cover plate 32 by a hot riveting column, and each wavy pole piece 33 has at least two hot riveting columns. The use of the above-mentioned wavy pole piece 33 realizes the series connection of multiple battery cell groups, which is not only convenient for expanding the capacity of the battery cell, but also improves the voltage and capacity of the soft-pack battery module. The series connection method is simple, ensuring that the high-voltage connection inside the battery module is stable and reliable, simplifying the circuit design, and reducing the complexity of the battery module. In addition, the wavy pole piece 33 has a buffering effect due to its shape advantage. When the soft-pack battery module is impacted or vibrated, it can effectively absorb and disperse energy to prevent the impact force from directly acting on the integrated cover plate 32, thereby reducing the risk of tearing the integrated cover plate 32, improving the mechanical strength and durability of the soft-pack battery module, and maintaining the stability of the electrical connection. At the same time, the buffering effect of the wavy pole piece 33 can also provide a certain flexibility when the battery cell expands and contracts, adapting to the volume change of the battery cell during the charge and discharge cycle, thereby extending the service life of the soft-pack battery module.

[0043] Specifically, in this embodiment, two wavy pole pieces 33 are arranged opposite to each other along the third direction, that is, two wavy pole pieces 33 realize the series connection of multiple battery cell groups, thereby disconnecting the high-voltage circuit of the soft-pack battery module, thereby improving the safety of installation. Among them, the material of the wavy pole piece 33 can be an Al pole piece.

[0044] Furthermore, the electrical connector also includes a flexible circuit board 34 (FPC), and a limiting groove (not shown) is provided on the side of the groove 321 along the first direction, and the flexible circuit board 34 is accommodated in the limiting groove. The flexible circuit board 34 acts as a battery cell signal acquisition component, which is used to obtain temperature, voltage, etc. in real time; and the flexible circuit board 34 is arranged on the side of the groove 321, which is conducive to realizing high and low voltage separation, avoiding electromagnetic interference at the battery module level, and improving the safety of the soft pack battery module. At the same time, combined with the setting of the limiting groove, on the one hand, the flexible circuit board 34 is prevented from being broken due to improper operations such as transportation and installation, and on the other hand, the structure of the groove 321 itself is utilized to further improve the space utilization.

[0045] In this embodiment, combined with Figure 3 and Figure 4 As shown, the electrical connector also includes a mica protective plate 35 and a mica protective layer 36. The integrated cover plate 32 has a first end face and a second end face that are arranged oppositely along the third direction. The first end face and the second end face are the upper end face and the lower end face of the integrated cover plate 32 that are arranged oppositely along the third direction. The upper end face of the integrated cover plate 32 is the upper end face of the groove 321, and the lower end face of the integrated cover plate 32 is the lower end face of the clamping member 322. The mica protective plate 35 is fixedly connected to the first end face. Each integrated cover plate 32 is provided with a corresponding mica protective plate 35. Specifically, the mica protective plate 35 can be fixedly connected to the integrated cover plate 32 by a plastic screw 351. The mica protective layer 36 is fixedly connected to the second end face. The mica protective plate 35 is also provided with an exhaust hole 352. That is to say, the negative electrode tab group and the positive electrode tab group are respectively located in the chamber formed by the mica protective plate 35, the mica protective layer 36 and the integrated cover plate 32. The exhaust holes 352 of the mica protective plate 35 are connected to the row grooves 3211, and the mica protective layer 36 does not have a hole structure, which limits the exhaust channel of the battery cell and prevents the thermal runaway gas from entering the lower layer from the upper layer, that is, to prevent the gas from accumulating in the center of the battery module and forming a short circuit between the positive and negative electrodes. At the same time, the thermal runaway gas is drained through the mica protective layer 36 at the pole ear and will pass through the L-shaped pole piece 31. At this time, the integrated cover plate 32 has achieved the expansion of the battery cell partition drainage, and then the gas passes through the row grooves 3211 and the wavy pole piece 33 to reach the mica protective plate 35. The exhaust holes 352 that match the row grooves 3211 are also provided to discharge the gas from the high-voltage area in time, avoiding the risk of the high-pressure gas being rebounded by the battery module shell and causing a secondary short circuit. In addition, due to their materials, the mica protective plate 35 and the mica protective layer 36 also play the role of high-voltage insulation protection.

[0046] In this embodiment, combined with Figure 1 and Figure 3As shown, the electrical connector also includes a protective cover 37, and the mica protective plate 35 is provided with a high-voltage disconnecting opening 353. The protective cover 37 covers the high-voltage disconnecting opening 353 along the third direction, that is, the protective cover 37 covers the high-voltage disconnecting opening 353 along the third direction. The high-voltage disconnecting opening 353 can disconnect the voltage exceeding 60v in the battery module, thereby realizing high-voltage protection of the module. In this way, the protective cover 37 realizes high-voltage insulation protection of the disconnection point inside the battery module. Among them, the material of the protective cover 37 can be ABS+PC. Among them, the present invention does not specifically limit the number of high-voltage disconnecting openings 353, and the technician can set one or more high-voltage disconnecting openings 353 according to specific needs to achieve one or more disconnections of the module voltage.

[0047] In this embodiment, continue to refer to Figure 1 As shown, the electrical connector also includes a bus 38, which is arranged between the mica protective plate 35 and the protective cover 37 along the third direction, wherein the bus 38 can be a copper bus. Through the above arrangement, the high-voltage breaking port 353 is connected through the bus 38 to realize the high-voltage series connection inside the battery module. The present invention takes into account that high voltage exceeding 60V will cause harm to the human body, and thus divides the high voltage of the battery module into positive and negative parts, and finally connects them in high-voltage series through the bus 38, which can avoid the high-voltage danger in the welding process. At the same time, the problem of increased internal resistance of the module that is easily caused by overheating of the bus 38 is also taken into account, and then through the above arrangement, the bus 38 is located on one side of the battery pack along the third direction, which is convenient for the bus 38 to dissipate heat, thereby avoiding excessive heat generation of the bus 38, resulting in an increase in the temperature of the battery cell.

[0048] In a second aspect, an embodiment of the present invention provides a battery pack, comprising the soft-pack battery module of any embodiment of the first aspect.

[0049] By adopting the above technical solution, the battery pack of the present invention integrates the above-designed soft-pack battery module, thereby having high space utilization and good heat dissipation performance. Therefore, the battery pack can accommodate more cells within a limited volume, thereby providing higher energy density and longer battery life.

[0050] In summary, the present invention realizes efficient arrangement and cell-level expansion to improve capacity through the design of cell arrangement and cell series-parallel connection. At the same time, it improves the space utilization of the soft-pack battery module, saves costs, avoids the electrical connector surrounding the battery pack, and simplifies the battery module structure. In addition, by designing the electrical connector, the thermal runaway safety, insulation protection and circuit connection reliability of the battery module are improved. Therefore, through the above technical solution, the present invention improves the overall capacity of the soft-pack battery module while greatly reducing the development cost. At the same time, through the high-voltage series connection of the integrated cover plate 32, high-voltage disconnection is achieved at the module level, which improves the safety performance of the battery module. And the integrated cover plate 32 on the side of the first battery cell 11 and the second battery cell 21 has a flexible structure, which can achieve adaptation of different batteries.

[0051] Therefore, under the premise that the market has increasingly higher requirements for the power of soft-pack battery modules, the present invention can improve the space utilization of the battery module in a limited space, and at the same time, without changing the state of the existing battery cells, it can achieve capacity expansion and cost reduction, while improving the capacity and energy, and at the same time avoid the problem of excessive heat generation due to limited space of the tabs, thereby improving the product safety factor.

[0052] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A soft pack battery module, comprising a battery pack and an electrical connector, characterized in that: The battery pack includes a first battery cell unit and a second battery cell unit arranged opposite to each other along a first direction, the first battery cell unit has a plurality of first battery cells sequentially arranged and stacked along a second direction, the second direction is perpendicular to the first direction, the second battery cell unit has a plurality of second battery cells sequentially arranged and stacked along the second direction, and the first battery cells and the second battery cells are arranged correspondingly; The first battery cell has a first pole tab, and the second battery cell has a second pole tab; the first battery cell and the corresponding second battery cell are connected in parallel through the first pole tab and the second pole tab; The first battery cell unit and the second battery cell unit are spaced apart in the first direction, and the first pole lug, the second pole lug and the electrical connector are located in the space; the first battery cell and the corresponding second battery cell form a plurality of battery cell groups, and the plurality of battery cell groups are connected in series through the electrical connector.

2. The soft pack battery module according to claim 1, characterized in that: The electrical connector includes an L-shaped pole piece, and the L-shaped pole piece is used to clamp a portion where the first pole tab and the second pole tab are connected in parallel.

3. The soft pack battery module according to claim 2, characterized in that: The electrical connector also includes an integrated cover plate, which includes a groove and a clip, wherein the groove and the clip are sequentially arranged along a third direction, wherein the third direction is perpendicular to the first direction and the second direction, wherein the clip is respectively clipped to the first pole ear and the second pole ear, and wherein the height of the clip is the same as the height of the first pole ear and the height of the second pole ear.

4. The soft pack battery module according to claim 3, characterized in that: The groove bottom of the groove is provided with a plurality of rows of grooves spaced apart along the second direction, and the L-shaped pole piece is exposed through the rows of grooves.

5. The soft pack battery module according to claim 4, characterized in that: The electrical connector also includes a wavy pole piece, which is sequentially arranged with the row groove along the third direction, and abuts against the L-shaped pole piece through the row groove, and a plurality of the battery cell groups are connected in series through the wavy pole piece.

6. The soft pack battery module according to claim 4, characterized in that: The electrical connector also includes a flexible circuit board. A limiting groove is provided on the side of the groove along the first direction, and the flexible circuit board is accommodated in the limiting groove.

7. The soft pack battery module according to claim 4, characterized in that: The electrical connector also includes a mica protective plate and a mica protective layer. The integrated cover plate has a first end face and a second end face that are relatively arranged along the third direction. The mica protective plate is fixedly connected to the first end face, the mica protective layer is fixedly connected to the second end face, and the mica protective plate is provided with an exhaust hole.

8. The soft pack battery module according to claim 7, characterized in that: The electrical connector also includes a protective cover, the mica protective plate is provided with a high-voltage disconnecting opening, and the protective cover covers the high-voltage disconnecting opening along the third direction.

9. The soft pack battery module according to claim 8, characterized in that: The electrical connector also includes a bus bar, which is arranged between the mica protection plate and the protection cover along the third direction.

10. A battery pack, comprising the soft-pack battery module according to any one of claims 1 to 9.

Images