A module combined power lithium battery module and battery pack

Abstract

The utility model discloses a module combined power lithium cell module and battery pack, including first backboard, second backplate and battery assembly, and battery assembly includes positive terminal piece, negative terminal piece and electric core unit, and electric core unit is located between positive terminal piece and negative terminal piece, and positive terminal piece and negative terminal piece include electrode assembly, and electrode assembly includes electrode plate and pole, and electrode plate includes first connecting part and second connecting part, and first connecting part and second connecting part are bent and connected in right angle, and first connecting part is connected with electric core unit, and pole is connected on second connecting part, and the positive pole of electric core unit is electrically connected with positive terminal piece, and the negative pole of electric core unit is electrically connected with negative terminal piece, and the both sides of positive terminal piece are connected with first backplate and second backplate respectively, and the both sides of negative terminal piece are connected with first backplate and second backplate respectively. Therefore, the utility model is assembled through the pre-modularized component, can reduce the difficulty of assembly on one hand, promotes the efficiency when assembling.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to modular combined power lithium battery modules. Background Technology

[0002] In the development of automotive power batteries, nickel-metal hydride (NiMH) batteries were initially the mainstream. However, with the advancement of lithium-ion battery technology, lithium-ion batteries have higher voltage, smaller size, lighter weight, and are more conducive to vehicle design. Furthermore, lithium-ion batteries have no memory effect, require no complex battery management, and are more convenient to use, thus gradually replacing traditional NiMH batteries. Taking Lexus as an example, although its hybrid models have completely replaced NiMH batteries with lithium-ion batteries in the past two years, a significant number of NiMH batteries still exist in the market. As these vehicles age, they generally face the risk of battery degradation and eventual scrapping, thus requiring replacement with new power battery packs. Our company has designed a power lithium-ion battery module for this purpose.

[0003] To facilitate the assembly of lithium-ion battery cells within the module housing, a certain amount of redundant space needs to be reserved inside the housing to provide convenient conditions for cell assembly and terminal connection. However, this will affect the number of lithium-ion battery cells inside the housing. For some vehicle models, the voltage of two lithium-ion battery cells connected in series may not meet the original vehicle's operating voltage. In this case, it may be necessary to connect at least three battery cells in series within the lithium-ion battery module. Therefore, a contradiction arises between the need for convenient operation and the requirement to install more battery cells in a limited space. Thus, it is very important to find a way to install at least three batteries in a single module without affecting the assembly operation. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a modular power lithium battery module.

[0005] A modular power lithium battery module according to an embodiment of the present invention includes:

[0006] First back panel;

[0007] Second back panel;

[0008] A battery assembly is disposed between a first backplate and a second backplate. The battery assembly includes a positive terminal, a negative terminal, and a cell unit. The cell unit is disposed between the positive terminal and the negative terminal. The positive terminal of the cell unit is electrically connected to the positive terminal, and the negative terminal of the cell unit is electrically connected to the negative terminal. Both sides of the positive terminal are connected to the first backplate and the second backplate, respectively, and both sides of the negative terminal are connected to the first backplate and the second backplate, respectively.

[0009] According to some embodiments of the present invention, the electrode assembly further includes: a pad, a first mounting hole on the second connecting portion, a second mounting hole on the pad, and the electrode post passing through the first mounting hole and the second mounting hole in sequence.

[0010] According to some embodiments of the present invention, the pad is provided with a limiting protrusion, the second connecting part is provided with a limiting groove, and the limiting protrusion is embedded in the limiting groove.

[0011] According to some embodiments of the present invention, the second connecting part is provided with a groove on the side surface near the first connecting part, the pole post is provided with an end, the diameter of the end is larger than the diameter of the pole post body, and the end is welded to the groove.

[0012] According to some embodiments of the present invention, the electrode assembly further includes: a nut, the electrode post includes a stud, the second connecting portion is provided with a first mounting hole, and the stud passes through the first mounting hole and is threadedly connected to the nut.

[0013] According to some embodiments of the present invention, the positive terminal component includes: a first housing, a first limiting portion provided on one side of the first housing, a second limiting portion provided on the first back plate, the first limiting portion and the second limiting portion engaging in a limiting cooperation; and / or a third limiting portion provided on the other side of the first housing, a fourth limiting portion provided on the second back plate, the third limiting portion and the fourth limiting portion engaging in a limiting cooperation; and / or

[0014] The negative terminal component includes: a second housing, a fifth limiting portion on one side of the second housing, a sixth limiting portion on the first back plate, the fifth limiting portion and the sixth limiting portion being mutually limiting and engaged, and / or a seventh limiting portion on the other side of the second housing, an eighth limiting portion on the second back plate, the seventh limiting portion and the eighth limiting portion being mutually limiting and engaged.

[0015] According to some embodiments of the present invention, the first limiting part is a limiting plate, and the second limiting part is a limiting hole; and / or

[0016] The third limiting part is a limiting plate, and the fourth limiting part is a limiting hole; and / or

[0017] The fifth limiting part is a limiting plate, and the sixth limiting part is a limiting hole; and / or

[0018] The seventh limiting part is a limiting plate, and the eighth limiting part is a limiting hole.

[0019] According to some embodiments of the present invention, the battery assembly further includes: a support member disposed below the battery cell unit, the first housing being detachably connected to the support member, and the second housing being detachably connected to the support member.

[0020] According to some embodiments of the present invention, the support member has a first groove on one side and a second groove on the other side, the first housing has a first protrusion that is embedded in the first groove, and the second housing has a second protrusion that is embedded in the second groove.

[0021] According to some embodiments of this utility model, the support member is an aluminum support plate, and the electrode plate is a copper-aluminum strip.

[0022] According to some embodiments of the present invention, the bottom of the first back plate is connected to the support member by screws, and / or the bottom of the second back plate is connected to the support member by screws.

[0023] According to some embodiments of the present invention, a first mounting seat is provided on the first back plate, the first mounting seat is located above the battery cell unit, and the first mounting seat is provided with a first mounting part. A second mounting seat is provided on the second back plate, the second mounting seat is located above the battery cell unit, and the second mounting seat is provided with a second mounting part. The second mounting part is limitedly connected to the first mounting part.

[0024] According to some embodiments of the present invention, the first back plate is made of plastic, and a first reinforcing rib is provided on the outer side of the first back plate, the first reinforcing rib being arranged vertically along the first back plate; and / or

[0025] The second back plate is made of plastic, and a second reinforcing rib is provided on the outer side of the second back plate. The second reinforcing rib is arranged vertically along the second back plate.

[0026] According to some embodiments of the present invention, the battery cell unit includes a connecting piece and at least two battery cells, one end of the connecting piece is rigidly connected to the battery cell, and the other end is rigidly connected to an adjacent battery cell.

[0027] A lithium battery pack according to a second embodiment of the present utility model includes multiple lithium battery modules, which are arranged in parallel and series, wherein the lithium battery modules adopt the above-mentioned power lithium battery module.

[0028] Beneficial effects

[0029] This invention uses pre-modular components for assembly, which can effectively reduce the difficulty of assembly and improve the efficiency of assembly. On the other hand, it can effectively improve the utilization rate of the space inside the module, allowing for the assembly of more battery cells when the battery compartment space is limited, thereby providing a higher operating voltage to the lithium battery module and meeting the needs of some high-voltage power vehicles. Attached Figure Description

[0030] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0031] Figure 1 This is a schematic diagram of a power lithium battery module according to an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the first backplate and the second backplate of the power lithium battery module according to an embodiment of the present utility model;

[0033] Figure 3 This is a schematic diagram of the battery assembly according to an embodiment of the present utility model;

[0034] Figure 4 This is a schematic diagram of the electrode assembly according to an embodiment of the present utility model;

[0035] Figure 5 This is a schematic diagram of an alternative structure for the electrode assembly according to an embodiment of the present invention.

[0036] Figure label:

[0037] 100. Lithium battery module;

[0038] 1. First back plate; 11. Second limiting part; 12. Sixth limiting part; 13. First mounting base; 131. First mounting part; 14. First reinforcing rib;

[0039] 2. Second back plate; 21. Fourth limiting part; 22. Eighth limiting part; 23. Second mounting base; 231. Second mounting part; 24. Second reinforcing rib;

[0040] 3. Positive end component; 31. First housing; 311. First limiting part; 312. Third limiting part; 313. First protrusion;

[0041] 4. Negative end component; 41. Second housing; 411. Fifth limiting part; 412. Seventh limiting part; 413. Second protrusion;

[0042] 5. Battery cell unit; 51. Connecting piece; 52. Battery cell;

[0043] 6. Electrode assembly; 61. Electrode plate; 611. First connecting part; 612. Second connecting part; 6121. First mounting hole; 6122. Limiting slot; 6123. Groove; 62. Electrode post; 621. End; 622. Stud; 63. Pad; 631. Second mounting hole; 632. Limiting protrusion; 64. Nut; 65. Support; 651. First slot; 652. Second slot. Detailed Implementation

[0044] The technical solutions of the embodiments disclosed in this application will be clearly and completely described below with reference to the accompanying drawings. The descriptions of the embodiments are merely illustrative and exemplary, and are not intended to limit the scope of this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort should fall within the scope of protection of this disclosure. Furthermore, techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification.

[0045] A lithium battery pack according to an embodiment of the present invention includes multiple lithium battery modules arranged in parallel, with adjacent lithium battery modules connected in series. The lithium battery modules adopt the following modular combination power lithium battery module 100.

[0046] Specifically, such as Figures 1 to 5 As shown, the modular power lithium battery module 100 includes: a first backplate 1, a second backplate 2, and a battery assembly disposed between the first backplate 1 and the second backplate 2. The battery assembly includes a positive terminal 3, a negative terminal 4, and a cell unit 5. The cell unit 5 is disposed between the positive terminal 3 and the negative terminal 4. Both the positive terminal 3 and the negative terminal 4 include an electrode assembly 6. The electrode assembly 6 includes an electrode plate 61 and a terminal post 62. The electrode plate 61 includes a first connecting portion 611 and a second connecting portion 612. The first connecting portion 611 and the second connecting portion 612 are connected at a right angle. The first connecting portion 611 is connected to the cell unit 5. The terminal post 62 is connected to the second connecting portion 612. The positive terminal of the cell unit 5 is electrically connected to the positive terminal 3, and the negative terminal of the cell unit 5 is electrically connected to the negative terminal 4. The two sides of the positive terminal 3 are respectively connected to the first backplate 1 and the second backplate 2, and the two sides of the negative terminal 4 are respectively connected to the first backplate 1 and the second backplate 2.

[0047] During assembly, the battery cells 52 are first connected in series to form a battery cell unit 5. Then, one end of the battery cell unit 5 is welded to the electrode plate 61 on the positive terminal 3, and the other end is welded to the electrode plate 61 on the negative terminal 4, thereby pre-assembling a battery assembly. Then, the first back plate 1 and the second back plate 2 are respectively fastened to the two sides of the battery assembly to form a complete lithium battery module.

[0048] In this process, since the positive terminal 3 and the negative terminal 4 are pre-modular structures, the pre-assembly of the electrode plate 61 and the terminal post 62 in batches reduces the workload of assembly workers and helps to improve assembly efficiency. Moreover, there is no need to perform assembly operations in the limited space of the module housing. This not only reduces the difficulty of assembly operations and the requirements for the skill level of assembly workers, but also reduces the training cycle and training cost. It also reduces the operating space in the traditional module housing used for assembling the electrode plate 61 and the terminal post 62, thus creating favorable space conditions for the assembly of the third cell 52 under limited space conditions.

[0049] Meanwhile, the positive terminal 3 and negative terminal 4 can limit the two sides of the cell unit 5, and the first back plate 1 and the second back plate 2 can limit the front and rear directions of the cell unit 5. This eliminates the need to set a limiting structure in the module housing, thus saving the limiting space and creating favorable space conditions for the assembly of the third cell 52. This facilitates the improvement of the total voltage and total capacity of the lithium battery module, which is beneficial for replacing the old battery packs of some large hybrid vehicles.

[0050] Therefore, this utility model uses pre-modular components for modular assembly, which can effectively reduce the difficulty of assembly, simplify the assembly process, and improve the efficiency of assembly. On the other hand, it can effectively improve the utilization rate of the space inside the module, and install more battery cells 52 when the battery compartment space is limited, thereby providing a higher working voltage to the lithium battery module and meeting the needs of some high-voltage power vehicles.

[0051] Furthermore, based on the above embodiments, such as Figure 4 As shown, the electrode assembly 6 also includes a pad 63. The second connecting part 612 is provided with a first mounting hole 6121, and the pad 63 is provided with a second mounting hole 631. The electrode post 62 passes through the first mounting hole 6121 and the second mounting hole 631 in sequence. Since the electrode plate 61 is relatively thin, if the electrode post 62 is directly connected to the first mounting hole 6121, the contact surface between the electrode post 62 and the second connecting part 612 is relatively small, the connection is unstable, and it is easy to tilt and desolder when subjected to external force. Therefore, by adding the pad 63, the thickness of the electrode sheet along the axial direction of the electrode post 62 can be increased in a disguised way. Thus, the pad 63 can be used to improve the support surface of the electrode post 62 and improve the reliability of the connection between the electrode post 62 and the electrode sheet.

[0052] Preferably, the pad 63 is provided with a limiting protrusion 632, and the second connecting part 612 is provided with a limiting groove 6122. The limiting protrusion 632 is embedded in the limiting groove 6122, thereby limiting the pad 63, preventing the pad 63 from rotating circumferentially, and improving the stability of the connection between the pad 63 and the second connecting part 612.

[0053] Furthermore, such as Figure 4 As shown, the second connecting part 612 has a groove 6123 on the side near the first connecting part 611, and the pole post 62 has an end 621. The diameter of the end 621 is larger than the diameter of the pole post 62. During connection, the end 621 of the pole post 62 is embedded in the groove 6123 and then welded. In this way, the enlarged end 621 can increase the welding contact surface between the pole post 62 and the electrode plate 61, without being limited by the size of the pole post 62 itself, which is beneficial to improving the connection stability between the pole post 62 and the electrode plate 61.

[0054] It should be noted that, as one of the alternative connection methods between the electrode plate 61 and the electrode post 62, the electrode assembly 6 includes a nut 64, the electrode post 62 includes a stud 622, and the second connecting part 612 is provided with a first mounting hole 6121. In use, the stud 622 of the electrode post 62 is passed through the first mounting hole 6121 and then threadedly connected to the nut 64. This detachable connection method is simpler and helps to reduce the process cost of connecting the electrode post 62 and the electrode plate 61.

[0055] In some embodiments of this application, the electrode plate 61 is made of copper-aluminum strip, which helps to improve the reliability of welding connections between different materials. Furthermore, since the battery terminal 62 of some hybrid vehicles is located at the top of the cell 52, and in some other vehicles the terminal is located slightly below the center of the cell 52, the electrodes of the cell 52 and the terminal in this invention cannot be on the same horizontal plane. Therefore, by bending the electrode plate 61, the longitudinal position of the terminal can be effectively changed to meet the matching requirements of the modular power lithium battery module with the original vehicle battery space.

[0056] In some embodiments of this utility model, such as Figure 2As shown, the positive terminal 3 includes a first housing 31. A first limiting portion 311 is provided on one side of the first housing 31, and a second limiting portion 11 is provided on the first back plate 1. The first limiting portion 311 and the second limiting portion 11 are mutually limiting. Simultaneously, a third limiting portion 312 is provided on the other side of the first housing 31, and a fourth limiting portion 21 is provided on the second back plate 2. The third limiting portion 312 and the fourth limiting portion 21 are mutually limiting. Similarly, the negative terminal 4 includes a second housing 41. A fifth limiting portion 411 is provided on one side of the second housing 41, and a sixth limiting portion 12 is provided on the first back plate 1. The fifth limiting portion 411 and the sixth limiting portion 12 are mutually limiting. Simultaneously, a seventh limiting portion 412 is provided on the other side of the second housing 41, and an eighth limiting portion 22 is provided on the second back plate 2. The seventh limiting portion 412 and the eighth limiting portion 22 are mutually limiting.

[0057] In this way, after the two ends of the cell unit 5 are electrically connected to the positive terminal 3 and the negative terminal 4 respectively, the limiting structures on the positive terminal 3 and the negative terminal 4 are used to limit and connect with the first back plate 1 and the second back plate 2 respectively, so that a relatively stable lithium battery module can be quickly assembled, realizing rapid pre-assembly between the terminal and the back plate, thereby improving assembly efficiency and facilitating subsequent fastening connections to obtain a complete lithium battery module.

[0058] Specifically, the first limiting part 311 is a limiting plate, the second limiting part 11 is a limiting hole, the third limiting part 312 is a limiting plate, the fourth limiting part 21 is a limiting hole, the fifth limiting part 411 is a limiting plate, the sixth limiting part 12 is a limiting hole, the seventh limiting part 412 is a limiting plate, and the eighth limiting part 22 is a limiting hole. Therefore, the limiting structure formed by the limiting plates and limiting holes is relatively simple, facilitates the mold opening of the back plate, and helps reduce the manufacturing cost of the back plate, the first housing 31, and the second housing 41.

[0059] In some embodiments of this application, such as Figure 3 As shown, the battery cell unit 5 includes a connecting piece 51 and at least two battery cells 52. One end of the connecting piece 51 is rigidly connected to the battery cell 52, and the other end is rigidly connected to the adjacent battery cell 52. In this way, the adjacent battery cells 52 are rigidly connected in series by the connecting piece 51, so that they can be pre-assembled into a rigid battery cell 52 assembly. This is beneficial for placing the rigid battery cell unit 5 on the first back plate 1 or the second back plate 2, thereby improving the efficiency of assembly.

[0060] Preferably, the battery assembly further includes a support member 65, which is disposed below the cell unit 5. The first housing 31 is detachably connected to the support member 65, and the second housing 41 is detachably connected to the support member 65. Specifically, the support member 65 has a first slot 651 on one side and a second slot 652 on the other side. The first housing 31 has a first protrusion 313 embedded in the first slot 651, and the second housing 41 has a second protrusion 413 embedded in the second slot 652.

[0061] This detachable structure, with its slot and protrusion limiting mechanism, simplifies assembly and improves efficiency. Furthermore, the support member 65, connected to the first housing 31 and the second housing 41, acts as a framework, enhancing the connection strength of the battery assembly. This not only facilitates the removal and movement of the assembled battery assembly, improving subsequent assembly efficiency, but also reduces the shaking of the cell unit 5 within the module, significantly improving its stability.

[0062] More preferably, the support member 65 is made of aluminum support plate, which reduces the weight of the support member 65 while ensuring the support strength, which is beneficial to reducing the weight of the lithium battery module.

[0063] Meanwhile, the bottom of the first back plate 1 can be connected to the support member 65 with screws, and the bottom of the second back plate 2 can be connected to the support member 65 with screws. In this way, the first back plate 1 and the second back plate 2 are connected to the support member 65, and the support member 65 serves as the fastening foundation of the entire lithium battery module. This not only improves the reliability of the connection, but also enhances the bending strength of the entire power lithium battery module structure.

[0064] In some embodiments of this utility model, such as Figure 2 As shown, a first mounting base 13 is provided on the first back plate 1, which is located above the cell unit 5. The first mounting base 13 is provided with a first mounting part 131. A second mounting base 23 is provided on the second back plate 2, which is located above the cell unit 5. The second mounting base 23 is provided with a second mounting part 231, which is limitedly connected to the first mounting part 131.

[0065] Specifically, the first mounting part 131 can adopt a limiting plate structure, and the second mounting part 231 can adopt a limiting hole structure, or the second mounting part 231 can adopt a limiting plate structure and the first mounting part 131 can adopt a limiting hole structure. Of course, the first mounting part 131 can also be provided with both a limiting plate and a limiting hole, and the second mounting part 231 can also be provided with both a limiting hole and a limiting plate. In this way, the limiting plate and the limiting hole can quickly achieve the limiting connection between the first back plate 1 and the second back plate 2.

[0066] In some embodiments of this utility model, the first backplate 1 is made of plastic and the second backplate 2 is made of plastic to avoid short circuits caused by contact between the cell unit 5, electrode plate 61 and connectors and the metal first backplate 1 or second backplate 2, thereby improving the safety of the modular power lithium battery module.

[0067] Preferably, such as Figure 2 As shown, a first reinforcing rib 14 is provided on the outer side of the first back plate 1, and the first reinforcing rib 14 is arranged vertically along the first back plate 1. Similarly, a second reinforcing rib 24 is provided on the outer side of the second back plate 2, and the second reinforcing rib 24 is arranged vertically along the second back plate 2. Since the strength of the plastic back plate is limited, the first reinforcing rib 14 can improve the structural strength of the first back plate 1, and the second reinforcing rib 24 can improve the structural strength of the second back plate 2, thereby reducing the deformation of the first back plate 1 and the second back plate 2, which is beneficial to improving the protection of the battery cell unit 5.

[0068] Furthermore, when adjacent modular power lithium battery modules are assembled side by side, the structure of the first reinforcing rib 14 and the second reinforcing rib 24 can form a flow channel gap between the adjacent first back plate 1 and second back plate 2, which is conducive to air flow and facilitates heat dissipation of the cell 52 body.

[0069] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0071] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A modular power lithium battery module, characterized in that, include: First back panel; Second back panel; A battery assembly is disposed between a first backplate and a second backplate. The battery assembly includes a positive terminal, a negative terminal, and a cell unit. The cell unit is disposed between the positive terminal and the negative terminal. Both the positive terminal and the negative terminal include an electrode assembly. The electrode assembly includes an electrode plate and a terminal post. The electrode plate includes a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are connected at a right angle. The first connecting portion is connected to the cell unit. The terminal post is connected to the second connecting portion. The positive terminal of the cell unit is electrically connected to the positive terminal. The negative terminal of the cell unit is electrically connected to the negative terminal. Both sides of the positive terminal are connected to the first backplate and the second backplate, respectively. Both sides of the negative terminal are connected to the first backplate and the second backplate, respectively.

2. The modular power lithium battery module according to claim 1, characterized in that, The electrode assembly further includes: a pad, a first mounting hole on the second connecting part, a second mounting hole on the pad, and the electrode post passing through the first mounting hole and the second mounting hole in sequence.

3. A modular power lithium battery module according to claim 2, characterized in that, The pad is provided with a limiting protrusion, and the second connecting part is provided with a limiting groove. The limiting protrusion is embedded in the limiting groove.

4. A modular power lithium battery module according to claim 3, characterized in that, The second connecting part has a groove on one side near the first connecting part, and the pole post has an end, the diameter of which is larger than the diameter of the pole post body, and the end is welded to the groove.

5. A modular power lithium battery module according to claim 2, characterized in that, The electrode assembly further includes a nut, the electrode post includes a stud, the second connecting part is provided with a first mounting hole, and the stud passes through the first mounting hole and is threadedly connected to the nut.

6. A modular power lithium battery module according to any one of claims 1 to 4 and 5, characterized in that, The positive terminal component includes: a first housing, a first limiting portion on one side of the first housing, a second limiting portion on the first back plate, the first limiting portion and the second limiting portion engaging in a limiting cooperation; and / or a third limiting portion on the other side of the first housing, a fourth limiting portion on the second back plate, the third limiting portion and the fourth limiting portion engaging in a limiting cooperation; and / or The negative terminal component includes: a second housing, a fifth limiting portion on one side of the second housing, a sixth limiting portion on the first back plate, the fifth limiting portion and the sixth limiting portion being mutually limiting and engaged, and / or a seventh limiting portion on the other side of the second housing, an eighth limiting portion on the second back plate, the seventh limiting portion and the eighth limiting portion being mutually limiting and engaged.

7. A modular power lithium battery module according to claim 6, characterized in that, The first limiting part is a limiting plate, and the second limiting part is a limiting hole; and / or The third limiting part is a limiting plate, and the fourth limiting part is a limiting hole; and / or The fifth limiting part is a limiting plate, and the sixth limiting part is a limiting hole; and / or The seventh limiting part is a limiting plate, and the eighth limiting part is a limiting hole.

8. A modular power lithium battery module according to claim 7, characterized in that, The battery assembly further includes a support member located below the battery cell unit, wherein the first housing is detachably connected to the support member, and the second housing is detachably connected to the support member.

9. A modular power lithium battery module according to claim 8, characterized in that, The support member has a first groove on one side and a second groove on the other side. The first housing has a first protrusion that is embedded in the first groove. The second housing has a second protrusion that is embedded in the second groove.

10. A power lithium battery module according to claim 9, characterized in that, The support component is made of aluminum support plate, and the electrode plate is made of copper-aluminum strip.

11. A power lithium battery module according to claim 9 or 10, characterized in that, The bottom of the first back plate is connected to the support member by screws, and / or The bottom of the second back plate is connected to the support member by screws.

12. A power lithium battery module according to claim 11, characterized in that, The first back plate is provided with a first mounting seat, which is located above the battery cell unit. The first mounting seat is provided with a first mounting part. The second back plate is provided with a second mounting seat, which is located above the battery cell unit. The second mounting seat is provided with a second mounting part, which is limitedly connected to the first mounting part.

13. A power lithium battery module according to claim 12, characterized in that, The first back plate is made of plastic, and a first reinforcing rib is provided on the outer side of the first back plate, the first reinforcing rib being arranged vertically along the first back plate; and / or The second back plate is made of plastic, and a second reinforcing rib is provided on the outer side of the second back plate. The second reinforcing rib is arranged vertically along the second back plate.

14. A power lithium battery module according to claim 1 or 13, characterized in that, The battery cell unit includes a connecting piece and at least two battery cells. One end of the connecting piece is rigidly connected to the battery cell, and the other end is rigidly connected to an adjacent battery cell.

15. A battery pack, characterized in that, include: A lithium battery module, wherein multiple lithium battery modules are arranged side by side, and the lithium battery modules are modular power lithium battery modules as described in any one of claims 1 to 14.

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