Power lithium battery module and battery pack

Abstract

The utility model discloses a kind of power lithium battery module and battery pack, including shell, electric core unit, simulation component and control chip, wherein, shell includes first backplate, second backplate and frame, first backplate is connected in one side surface of frame, second backplate is connected in the other side surface of frame, frame includes first end piece and second end piece, positive terminal is equipped on the first end piece, negative terminal is equipped on the second end piece, two ends of electric core unit are electrically connected with terminal respectively, simulation component includes heating plate and heating unit, heating unit is connected on heating plate, to control heating unit heat generation. Thus, the utility model discloses a kind of power lithium battery module, by simulating the temperature characteristic of " nickel-metal hydride battery " of original vehicle, " deceive " the battery management system of original vehicle, so as not to change the battery management system of original vehicle, completely match the monitoring system of original vehicle nickel-metal hydride battery, realize the effect that lithium battery replaces nickel-metal hydride battery without loss, it is favorable to reduce the replacement cost of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to 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 do not have a 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.

[0003] In this process, using original nickel-metal hydride (NiMH) battery packs resulted in relatively low energy density and extremely high costs. Therefore, the idea arose to replace NiMH battery packs in hybrid vehicles with lithium-ion battery packs, which have higher energy density. However, lithium-ion batteries and NiMH batteries have different characteristics, particularly in charging. For example, NiMH batteries can tolerate moderate overcharging during charging, allowing for heat dissipation. Lithium-ion batteries, on the other hand, cannot be overcharged, as overcharging can easily lead to explosions and fires, posing a significant danger. Furthermore, the original vehicle's battery management system is designed for NiMH batteries. Directly replacing them with lithium-ion batteries would create a mismatch between charging and battery management, potentially leading to safety risks. Therefore, traditional lithium-ion batteries cannot be directly used to replace NiMH batteries, thus limiting their application and replacement in NiMH battery vehicles. Utility Model Content

[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 power lithium battery module.

[0005] A power lithium battery module according to an embodiment of the present invention includes: The housing has a battery cavity inside. The housing includes a first back plate, a second back plate, and a frame. The frame includes a first end piece and a second end piece. The first end piece has a positive terminal, and the second end piece has a negative terminal. A battery cell unit is disposed between the first backplate and the second backplate, and between the first end piece and the second end piece. The positive terminal of the battery cell unit is electrically connected to the positive terminal, and the negative terminal of the battery cell unit is electrically connected to the negative terminal. The simulation component includes a heat-conducting plate, a heating element, and a control chip. The heating element is connected to the heat-conducting plate to conduct heat to the heat-conducting plate. The heat-conducting plate is located below the battery cell unit. The control chip is located inside the battery cavity and is electrically connected to the heating element to control the heating element to generate heat.

[0006] According to some embodiments of the present invention, one end of the heat-conducting plate is detachably connected to the first end member, and the other end is detachably connected to the second end member.

[0007] According to some embodiments of the present invention, the power lithium battery module further includes: a first electrode plate and a second electrode plate, and the cell unit includes a first cell, a second cell and a third cell. One end of the first electrode plate is rigidly connected to the negative electrode of the first cell, and the other end is rigidly connected to the positive electrode of the second cell. One end of the second electrode plate is rigidly connected to the negative electrode of the second cell, and the other end is rigidly connected to the positive electrode of the third cell.

[0008] According to some embodiments of the present invention, the first end piece includes a third electrode plate and a first plastic casing, the first plastic casing being wrapped around the third electrode plate, the third electrode plate including a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being bent at a right angle, the first connecting portion being rigidly connected to the positive electrode of the battery cell, and the second connecting portion being rigidly connected to the positive electrode terminal; and / or The second end piece includes a fourth electrode plate and a second plastic casing. The second plastic casing is wrapped around the fourth electrode plate. The fourth electrode plate includes a third connecting part and a fourth connecting part. The third connecting part and the fourth connecting part are bent at a right angle. The third connecting part is rigidly connected to the negative terminal of the cell unit, and the fourth connecting part is rigidly connected to the negative terminal.

[0009] According to some embodiments of the present invention, a first limiting plate is provided on one side of the first plastic casing, a first limiting hole is provided on the first back plate, the first limiting plate is embedded in the first limiting hole, and the number of first limiting plates on one side of the positive terminal is greater than the number of first limiting plates on the other side; and / or The first plastic casing has a second limiting plate on the other side, and a second limiting hole is provided on the second back plate. The second limiting plate is embedded in the second limiting hole, and the number of the second limiting plates on the positive terminal side is greater than the number of the second limiting plates on the other side.

[0010] According to some embodiments of the present invention, a first fixing plate is provided at the bottom of the first back plate, and a first fixing part is provided on the first fixing plate. The first fixing part is located below the heat-conducting plate for fixing a temperature sensor; and / or The bottom of the second back plate is provided with a second fixing plate, and the second fixing plate is provided with a second fixing part. The second fixing part is located below the heat-conducting plate for fixing the temperature sensor.

[0011] According to some embodiments of this utility model, the heat-conducting plate is made of aluminum, the heat-conducting plate is provided with a recess, the heating element is disposed in the recess, and the control chip is disposed on the battery cell.

[0012] According to some embodiments of the present invention, the first plastic seal has a first protrusion, the heat-conducting plate has a first groove, and the first protrusion is embedded in the first groove; and / or the second plastic seal has a second protrusion, the heat-conducting plate has a second groove, and the second protrusion is embedded in the second groove.

[0013] According to some embodiments of the present invention, the heating element includes any one of a heating resistor, a heating wire, and a heating film.

[0014] A battery pack according to a second embodiment of the present utility model includes a base plate, side plates, and lithium battery modules. The side plates are fixedly disposed on both sides of the base plate, and the lithium battery modules are arranged side by side on the base plate. Adjacent lithium battery modules are arranged in series in parallel. The lithium battery modules are power lithium battery modules that replace nickel-metal hydride power batteries as described above.

[0015] Beneficial effects

[0016] This invention designs the housing of the power lithium battery module as a split structure, which on the one hand improves the assembly efficiency of the cell unit, and on the other hand, since there is no need to perform operations such as electrode connection in the battery cavity, it can greatly save this part of the operating space, thereby reducing the spatial size of the power lithium battery module housing, which is conducive to accommodating more lithium battery cells and facilitating the arrangement of more power lithium battery modules in the limited space of the original vehicle battery compartment.

[0017] This utility model's power lithium battery module acts as a "temperature simulator" by adding a heating structure to mimic the temperature characteristics of the original vehicle's "nickel-metal hydride battery." This facilitates the monitoring and data collection by the original vehicle's temperature sensors, thereby simulating the heating characteristics of a nickel-metal hydride battery during operation and "deceiving" the original vehicle's battery management system. This eliminates the need to modify the original vehicle's battery management system, perfectly matching the original nickel-metal hydride battery's monitoring system. This allows the original vehicle's battery management system to determine the "lithium battery's" operating status based on the matching characteristics between monitored voltage and temperature, achieving a non-destructive replacement of the nickel-metal hydride battery with a lithium battery and reducing battery pack replacement costs.

[0018] Meanwhile, this method of dissipating energy through heating not only avoids overcharging of the lithium battery cells, improving the safety of the original vehicle's nickel-metal hydride charging system when charging lithium batteries, but also balances the cell charging voltage, improving the consistency of cell charging. This solves the problem caused by the original vehicle's nickel-metal hydride battery system using uniform charging parameters, which cannot dynamically adjust the charging strategy for lithium batteries. Attached Figure Description

[0019] 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: Figure 1 This is a schematic diagram of a power lithium battery module according to an embodiment of the present utility model; Figure 2 This is an exploded view of the structure of a power lithium battery module according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the battery cell unit according to an embodiment of the present utility model; Figure 4 These are schematic diagrams of the third and fourth electrode plates according to embodiments of this utility model; Figure 5 This is a schematic diagram of the battery pack structure according to an embodiment of the present utility model.

[0020] Figure label: 100. Power lithium battery module; 200. Battery pack; 1. Housing; 11. First back plate; 111. First limiting hole; 112. First fixing plate; 113. First fixing part; 114. Third limiting hole; 12. Second back plate; 121. Second limiting hole; 122. Second fixing plate; 123. Second fixing part; 124. Fourth limiting hole; 3. First end piece; 31. Positive terminal; 32. Third electrode plate; 321. First connecting part; 322. Second connecting part; 33. First plastic seal; 331. First limiting plate; 332. Second limiting plate; 333. First protrusion; 4. Second end piece; 41. Negative terminal; 42. Fourth electrode plate; 421. Third connecting part; 422. Fourth connecting part; 43. Second plastic seal; 431. Third limiting plate; 432. Fourth limiting plate; 433. Second protrusion; 5. Battery cell unit; 51. First battery cell; 52. Second battery cell; 53. Third battery cell; 54. First electrode plate; 55. Second electrode plate; 6. Simulation component; 61. Heat-conducting plate; 611. Recess; 612. First groove; 613. Second groove; 62. Heating element; 7. Control chip; 8. Base plate; 81. Perforation; 9. Side plate. Detailed Implementation

[0021] 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.

[0022] Combination Figures 1 to 4 As shown, a power lithium battery module 100 according to an embodiment of the present invention includes: a housing 1 and a cell unit 5 disposed in the housing 1. The housing 1 is provided with a battery cavity, a positive terminal 31 is provided on one side of the battery cavity, and a negative terminal 41 is provided on the other side of the battery cavity. The positive terminal of the cell unit 5 is electrically connected to the positive terminal 31, and the negative terminal of the cell unit 5 is electrically connected to the negative terminal 41.

[0023] The power lithium battery module 100 also includes a simulation component 6, which includes a heat-conducting plate 61, a heating element 62, and a control chip 7. The heating element 62 includes any one of a heating resistor, a heating wire, and a heating film. The heat-conducting plate 61 is a metal heat-conducting plate 61, which is located at the bottom of the cell unit 5. The heating element 62 is connected to the heat-conducting plate 61. The control chip 7 is electrically connected to the heating element 62 to control the heating of the heating element 62. The heat generated by the heating element 62 is transferred to the heat-conducting plate 61 so that the battery management system of the hybrid vehicle can properly manage the replacement battery module.

[0024] The original vehicle's battery monitoring system monitors the voltage and temperature of the nickel-metal hydride battery pack separately, and judges the status of the nickel-metal hydride cells by the characteristics between voltage and temperature. However, because lithium batteries have different characteristics from nickel-metal hydride batteries, lithium batteries cannot achieve self-heating. Therefore, the original vehicle's battery system cannot judge the working status of lithium batteries by monitoring the characteristics of cell temperature and voltage. Directly using lithium batteries to replace nickel-metal hydride batteries will cause the risk of runaway.

[0025] Therefore, this application adds a heating structure to the lithium battery to act as a "temperature simulator". When the power lithium battery module is charging, the control chip 7 controls the heating element 62 to heat up. The heat from the heating element 62 is transferred to the heat conduction plate 61, simulating the temperature characteristics of the original car's nickel-metal hydride battery during operation. This facilitates the monitoring and data collection of the original car's temperature sensor, thereby "deceiving" the original car's battery management system. This creates a mapping relationship between the replacement lithium battery and the original car's nickel-metal hydride battery, allowing the replacement lithium battery to "wear" the "shell" of the nickel-metal hydride battery. In this way, without "technically" cracking and modifying the original car's battery management system, the power lithium battery module can be completely matched with the original car's nickel-metal hydride battery monitoring system. Thus, the original car's battery management system can judge the "lithium battery's" operating status based on the matching characteristics between the monitored voltage and temperature, achieving the effect of a lithium battery replacing a nickel-metal hydride battery without damage.

[0026] Based on this, due to the different inherent qualities of each lithium battery cell—that is, differences in manufacturing processes and material characteristics—the internal resistance, capacity, and charging response characteristics of each cell in the battery module vary, leading to inconsistent charging states among the modules during the charging process. However, the original vehicle's battery management system is designed for nickel-metal hydride (NiMH) batteries. The overcharge characteristics of NiMH batteries mean that the original vehicle's management system uses uniform charging parameters and cannot dynamically adjust the charging strategy for lithium batteries. Therefore, uneven charging can occur; that is, under the same charging time conditions, some cells may be fully charged, while others may only be 95% charged, thus affecting the normal use of the replacement battery pack.

[0027] Therefore, when the power lithium battery module of this utility model is charged using the original vehicle's charging system, since the lithium battery cannot be overcharged, when the lithium battery is about to be fully charged, some of the charge can be released through heat. In this way, the excess charge is dissipated by using the heat generated by the simulated component 6, thereby effectively avoiding overcharging of the battery and ensuring the charging safety of the lithium battery. This allows the lithium battery with higher energy density to successfully replace the nickel-metal hydride battery and ensure safe use, and the replacement cost is lower.

[0028] Specifically, when using the original vehicle's nickel-metal hydride charging system to charge the power lithium battery module, a charging voltage limit point can be preset. This limit point can be set to 4.15V or 4.17V. When the voltage of some lithium battery cells reaches this limit point, the subsequent charging of that cell can be controlled to release some of the charge as heat, thus waiting for the cells that charge more slowly. This continues until all the battery module cells reach the full charge voltage of 4.2V within a similar time. At this point, the original vehicle's battery charging management system can stop charging.

[0029] Therefore, by utilizing the power consumption and heat generation of the simulated component 6, this utility model can release the charge that is about to be overcharged in some battery cells, thereby achieving a balanced charging effect for lithium batteries using the original vehicle's nickel-metal hydride charging system. This balances the charging capacity between different lithium batteries, achieves a balance in battery voltage, ensures the consistency of charging capacity, and avoids situations such as false charging or incomplete charging caused by voltage imbalance.

[0030] In addition, the method of simulating the power consumption and heat generation of component 6 is also beneficial for preheating the battery pack, which helps to improve the charging efficiency and working effect of the battery pack in low-temperature environments in winter.

[0031] Furthermore, such as Figure 1 and Figure 2 As shown, the housing 1 includes a first back plate 11, a second back plate 12 and a frame. The first back plate 11 is connected to one side of the frame, and the second back plate 12 is connected to the other side of the frame. The frame includes a first end member 3 and a second end member 4. A positive terminal 31 is disposed on the first end member 3, and a negative terminal 41 is disposed on the second end member 4.

[0032] During assembly, the cell unit 5 is first connected to the frame, and then the first back plate 11 and the second back plate 12 are connected to the frame to form a complete power lithium battery module. By designing the housing 1 of the power lithium battery module as a split structure, it is beneficial to improve the assembly efficiency of the cell unit 5. On the other hand, since there is no need for electrode connection operations inside the battery cavity, this greatly saves the operating space, thereby reducing the size of the power lithium battery module and accommodating more lithium battery cells. This allows for the placement of more power lithium battery modules within the limited space of the original vehicle's battery compartment. At the same time, it can also provide a higher operating voltage to the lithium battery module to meet the needs of some high-voltage power vehicles.

[0033] In some embodiments of this utility model, such as Figure 1As shown, one end of the heat-conducting plate 61 is detachably connected to the first end piece 3, and the other end is detachably connected to the second end piece 4. Thus, the first end piece 3, the second end piece 4, and the heat-conducting plate 61 can be quickly assembled into a frame structure through this split structure, improving assembly efficiency. At the same time, it will not affect the electrode spot welding operation. Moreover, the metal heat-conducting plate 61 not only plays the role of heat transfer and heat dissipation, but also plays the role of supporting the frame, which is conducive to improving the structural strength of the entire power lithium battery module.

[0034] Furthermore, based on the above embodiments, such as Figure 3 As shown, the battery unit 5 includes several battery cells and connecting plates. One end of the connecting plate is rigidly connected to a battery cell, and the other end is rigidly connected to an adjacent battery cell. Specifically, the connecting plate includes a first electrode plate 54 and a second electrode plate 55. The battery cell unit 5 includes three battery cells connected in series: a first battery cell 51, a second battery cell 52, and a third battery cell 53. One end of the first electrode plate 54 is rigidly connected to the negative electrode of the first battery cell 51, and the other end is rigidly connected to the positive electrode of the second battery cell 52. One end of the second electrode plate 55 is rigidly connected to the negative electrode of the second battery cell 52, and the other end is rigidly connected to the positive electrode of the third battery cell 53. By rigidly connecting adjacent battery cells in series through the electrode plates, a rigid battery cell assembly can be pre-assembled. During assembly, the rigid battery cell unit 5 can be directly placed into the battery cavity, thereby improving assembly efficiency.

[0035] Furthermore, based on the above embodiments, such as Figure 1 and Figure 2 As shown, the first end piece 3 includes a third electrode plate 32, which includes a first connecting portion 321 and a second connecting portion 322. The first connecting portion 321 and the second connecting portion 322 are bent at a right angle. The first connecting portion 321 is rigidly connected to the positive electrode of the battery cell 5, and the second connecting portion 322 is rigidly connected to the positive electrode terminal 31. This allows the first end piece 3 to form a rigid connection structure with the entire battery cell 5, which helps to reduce the shaking of the battery cell 5 within the housing 1 and greatly improves the stability of the battery cell 5 within the housing 1.

[0036] Specifically, since the power lithium battery module of this utility model is used to replace the original nickel-metal hydride battery, and the space for placing the battery pack in the original vehicle is fixed, the structure and size of the power lithium battery module of this utility model are also limited by the structure and size of the original nickel-metal hydride battery pack. In particular, the battery terminal of some hybrid vehicles is located in the lower middle part of the cell, which makes it impossible for the cell electrode and the terminal to be on the same horizontal plane. Therefore, the position of the positive terminal 31 can be effectively changed by bending the third electrode plate 32 to meet the matching degree of the power lithium battery module structure with the original vehicle battery space.

[0037] Furthermore, the first end piece 3 also includes a first plastic casing 33, which wraps around the third electrode plate 32, thereby preventing the metallic third electrode plate 32 from directly contacting the battery cell and improving the safety of the power lithium battery module.

[0038] Meanwhile, three first limiting plates 331 are provided on one side of the first plastic seal 33, and three first limiting holes 111 are provided on the first back plate 11. The first limiting plates 331 are embedded in the first limiting holes 111. Similarly, a second limiting plate 332 is provided on the other side of the first plastic seal 33, and a second limiting hole 121 is provided on the second back plate 12. The second limiting plate 332 is embedded in the second limiting hole 121. In this way, the structure of the limiting plates and limiting holes can realize the rapid pre-assembly between the first end piece 3 and the first back plate 11 and the second back plate 12, thereby improving the assembly efficiency.

[0039] Furthermore, two first limiting plates 331 are provided above the positive terminal 31 and one first limiting plate 331 is provided below it. Similarly, the number of second limiting plates 332 above the positive terminal 31 is greater than the number of second limiting plates 332 below it, thus forming a foolproof design. During assembly, it can avoid errors when connecting the back plate and the first end piece 3, which is conducive to improving the efficiency of pre-assembly.

[0040] Furthermore, based on the above embodiments, the second end piece 4 includes a fourth electrode plate 42 and a second plastic casing 43. The second plastic casing 43 is wrapped around the fourth electrode plate 42. The fourth electrode plate 42 includes a third connecting part 421 and a fourth connecting part 422. The third connecting part 421 and the fourth connecting part 422 are bent at a right angle. The third connecting part 421 is rigidly connected to the negative electrode of the battery cell unit 5, and the fourth connecting part 422 is rigidly connected to the negative electrode terminal 41.

[0041] The second plastic casing 43 has a third limiting plate 431 on one side and a third limiting hole 114 on the first back plate 11. The third limiting plate 431 is embedded in the third limiting hole 114, and the number of third limiting plates 431 on the negative terminal 41 side is greater than the number of third limiting plates 431 on the other side. Similarly, the second plastic casing 43 has a fourth limiting plate 432 on the other side and a fourth limiting hole 124 on the second back plate 12. The fourth limiting plate 432 is embedded in the fourth limiting hole 124, and the number of fourth limiting plates 432 on the negative terminal 41 side is greater than the number of fourth limiting plates 432 on the other side.

[0042] Specifically, the structure and function of the second end piece 4 are the same as those of the first end piece 3, so they will not be described again here.

[0043] Furthermore, the first plastic casing 33 has a first protrusion 333, and the heat-conducting plate 61 has a first groove 612. In use, the first protrusion 333 is embedded in the first groove. Similarly, the second plastic casing 43 has a second protrusion 433, and the heat-conducting plate 61 has a second groove 613, with the second protrusion 433 embedded in the second groove 613. The detachable structure of the protrusion and groove simplifies installation and makes it more convenient, thus reducing manufacturing costs.

[0044] In some embodiments of this utility model, such as Figure 1 As shown, the bottom of the first backplate 11 is provided with a first fixing plate 112, and the first fixing plate 112 is provided with a first fixing part 113. The first fixing part 113 is located below the heat-conducting plate 61 for fixing the temperature sensor. Similarly, the bottom of the second backplate 12 is provided with a second fixing plate 122, and the second fixing plate 122 is provided with a second fixing part 123. The second fixing part 123 is located below the heat-conducting plate 61 for fixing the temperature sensor. The first fixing part 113 and the second fixing part 123 can adopt a bayonet structure to secure both sides of the temperature sensor. In use, the probe of the original vehicle's temperature sensor can be fixed to the first fixing part 113 and the second fixing part 123, thereby using the temperature sensor to monitor the temperature of the heating plate, which is beneficial to improving the detection and judgment of the status of the power lithium battery module of this application by the original vehicle's battery management system.

[0045] In some embodiments of this utility model, the heat-conducting plate 61 is made of aluminum plate. Since aluminum plate has good heat dissipation performance and is relatively light, it is beneficial to reduce the weight of the power lithium battery module. At the same time, in order to save space in the battery cavity, a recessed part 611 can be provided on the heat-conducting plate 61, and the heating element 62 is placed in the recessed part 611. This helps to keep the heating element 62 away from the battery cell and reduce the adverse effect of the temperature of the heating element 62 on the battery cell. Meanwhile, the control chip 7 is placed on the battery cell, and the two ends of the control chip 7 are respectively connected to the positive and negative terminals of the battery cell. In this way, the control chip 7 is integrated on the battery cell, which not only facilitates local power supply, but also reduces the influence of wiring harness, thereby improving the integration of the power lithium battery module.

[0046] Preferably, the bottom of the first backplate is connected to the heat-conducting plate with screws, and the bottom of the second backplate is also connected to the heat-conducting plate with screws. This connection of both the first and second backplates to the metallic heating plate 62 utilizes the inherent strength of the heating plate to enhance the overall bending resistance of the lithium battery module, while also improving the reliability of the screw connections.

[0047] like Figure 5As shown, a battery pack 200 according to an embodiment of the present utility model includes a base plate 8, a side plate 9 and a lithium battery module. The side plate 9 is fixedly connected to both sides of the base plate 8, and multiple lithium battery modules are arranged side by side on the base plate 8. The lithium battery modules adopt the above-mentioned power lithium battery module 100.

[0048] Specifically, the base plate 8 is provided with a long strip-shaped perforation 81. The perforation 81 can be used to pass through the first fixing plate 112 and the second fixing plate 122 of the fixed temperature sensor, and can also be used for ventilation. When in use, the airflow of the vehicle's cooling fan can flow through the perforation 81 to the gap between the lithium battery modules, thereby reducing the temperature between the power lithium battery modules 100 and avoiding heat accumulation.

[0049] Preferably, the base plate 8 is made of aluminum, and the power lithium battery module 100 is connected to the base plate 8 by screws, so that the heat conduction plate 61 can directly contact the base plate 8. This not only improves the installation stability of the battery module, but also facilitates the direct transfer of heat from the heat conduction plate to the base plate, thereby improving heat dissipation efficiency.

[0050] 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.

[0051] 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.

[0052] 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 power lithium battery module, characterized in that, include: The housing has a battery cavity inside. The housing includes a first back plate, a second back plate, and a frame. The frame includes a first end piece and a second end piece. The first end piece has a positive terminal, and the second end piece has a negative terminal. A battery cell unit is disposed between the first backplate and the second backplate, and between the first end piece and the second end piece. The positive terminal of the battery cell unit is electrically connected to the positive terminal, and the negative terminal of the battery cell unit is electrically connected to the negative terminal. The simulation component includes a heat-conducting plate, a heating element, and a control chip. The heating element is connected to the heat-conducting plate to conduct heat to the heat-conducting plate. The heat-conducting plate is located below the battery cell. The control chip is located inside the battery cavity and is electrically connected to the heating element to control the heating element to generate heat. The first end piece includes a first plastic shell with a first protrusion. The heat-conducting plate has a first groove in which the first protrusion is embedded. And / or the second end piece includes a second plastic shell with a second protrusion. The heat-conducting plate has a second groove in which the second protrusion is embedded.

2. The power lithium battery module according to claim 1, characterized in that, The heating element includes any one of a heating resistor, a heating wire, and a heating film.

3. A power lithium battery module according to claim 1, 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 one of the battery cells, and the other end is rigidly connected to another adjacent battery cell.

4. A power lithium battery module according to claim 3, characterized in that, The battery cell unit includes a first battery cell, a second battery cell, and a third battery cell. The connecting piece includes a first electrode plate and a second electrode plate. One end of the first electrode plate is rigidly connected to the negative electrode of the first battery cell, and the other end is rigidly connected to the positive electrode of the second battery cell. One end of the second electrode plate is rigidly connected to the negative electrode of the second battery cell, and the other end is rigidly connected to the positive electrode of the third battery cell.

5. A power lithium battery module according to any one of claims 1 to 4, characterized in that, One end of the heat-conducting plate is detachably connected to the first end piece, and the other end of the heat-conducting plate is detachably connected to the second end piece.

6. A power lithium battery module according to claim 5, characterized in that, A first limiting plate is provided on one side of the first plastic seal, and a first limiting hole is provided on the first back plate, with the first limiting plate embedded in the first limiting hole; and / or The other side of the first plastic seal is provided with a second limiting plate, and the second back plate is provided with a second limiting hole, and the second limiting plate is embedded in the second limiting hole.

7. A power lithium battery module according to claim 6, characterized in that, The second plastic seal has a third limiting plate on one side, and the first back plate has a third limiting hole, with the third limiting plate embedded in the third limiting hole; and / or The second plastic seal is provided with a fourth limiting plate on the other side, and a fourth limiting hole is provided on the second back plate. The fourth limiting plate is embedded in the fourth limiting hole.

8. A power lithium battery module according to claim 7, characterized in that, The first terminal includes a third electrode plate, the third electrode plate including a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being bent at a right angle, the first connecting portion being rigidly connected to the positive electrode of the battery cell, and the second connecting portion being rigidly connected to the positive electrode terminal; and / or The second end piece includes a fourth electrode plate, which includes a third connecting part and a fourth connecting part. The third connecting part and the fourth connecting part are bent at a right angle. The third connecting part is rigidly connected to the negative terminal of the battery cell, and the fourth connecting part is rigidly connected to the negative terminal.

9. A power lithium battery module according to any one of claims 6 to 8, characterized in that, The heat-conducting plate is made of aluminum and has a recessed portion. The heating element is located in the recessed portion, and the control chip is located on the battery cell.

10. A power lithium battery module according to claim 9, characterized in that, The bottom of the first back plate is provided with a first fixing plate, and the first fixing plate is provided with a first fixing part, which is located below the heat-conducting plate for fixing a temperature sensor; and / or The bottom of the second back plate is provided with a second fixing plate, and the second fixing plate is provided with a second fixing part. The second fixing part is located below the heat-conducting plate for fixing the temperature sensor.

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

12. A battery pack, characterized in that, include: The base plate, side plates, and lithium battery modules are provided. The side plates are fixedly disposed on both sides of the base plate, and the lithium battery modules are disposed side by side on the base plate. The lithium battery modules are power lithium battery modules as described in any one of claims 1 to 11.

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