Modularized sodium ion storage battery

Abstract

The utility model discloses a modularized sodium ion storage battery which is arranged on an electric vehicle, the modularized sodium ion storage battery comprises a plurality of battery modules which are connected through acquisition wire harnesses, and when the battery modules are compactly mounted in a battery compartment of the electric vehicle, the total occupied area is matched with the internal compartment bottom area of the battery compartment; and the vacant area of the inner bin bottom of the battery bin is smaller than the occupied area of a single battery module. According to the utility model, a proper number of small-size battery modules can be combined for use according to the specific size of a battery compartment of an electricity loading object, so that the working electric energy requirement of the electricity loading object is met, the volume of the battery compartment can be utilized to the greatest extent, and the electricity loading process is easier and more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, more specifically, it relates to a modular sodium ion battery. BACKGROUND

[0002] According to the latest market research and industry analysis, the future development trend of electric vehicle industry is that on the one hand, with the progress of technology and the improvement of consumer cognition, the market demand of electric vehicles will continue to grow, and the market scale will continue to expand: on the other hand, the innovation of battery technology, the improvement of charging infrastructure, the application of intelligent driving technology and other technological progress will promote the sustainable development of the industry, especially the battery technology, the improvement of energy density and the reduction of cost will directly improve the performance of electric vehicles, and then improve the market acceptance. Sodium ion battery has the characteristics of high energy density, light weight and low cost compared with traditional lead-acid battery, and has great market competitive advantage compared with lead-acid battery, and is expected to replace lead-acid battery in two-wheel and three-wheel electric vehicle market. At present, the market has not yet formulated unified standards for sodium battery, and the battery compartment size of two-wheel and three-wheel electric vehicles of different brands is also different, so it is difficult to configure sodium battery pack with uniform size, and it is necessary to combine small size battery modules into battery pack with appropriate size. However, the combination of battery modules in the prior art usually needs to be carried out at the production end, which needs complex tools, facilities, working environment and other conditions. The invention with publication number CN115241612A discloses a battery module and a battery pack, which connects the FPC collection plate inside the battery module, reduces the space of the module series wiring harness, and is beneficial to improve the efficiency of module series and parallel connection. However, the method of using FPC collection plate to connect the battery module inside the battery module in the invention is only suitable for application in the battery production process, and in the consumer end, due to the restriction of tools, facilities, working environment and other factors, it is not suitable for users to apply FPC collection plate to connect battery modules when carrying out daily battery pack replacement operation. SUMMARY

[0003] In the prior art, it is not convenient to combine battery modules on site when installing battery pack on electric vehicle, in order to overcome this defect, the utility model provides a modular sodium ion battery, which can simplify the combination operation of battery modules, and facilitate flexible combination of battery modules on site, so as to better match the decoration requirements of different vehicle models.

[0004] The utility model discloses a technical scheme is: a modular sodium ion battery is equipped on electric vehicle, the modular sodium ion battery includes a plurality of battery module connected through the collection wire harness, the total area of the land of battery module when the compact installation in the battery compartment of electric vehicle matches the inside bottom area of battery compartment, and the inside bottom idle area of battery compartment is less than the land area of single battery module. The existing battery is usually packaged into a battery pack after a plurality of battery cell modules or battery modules are combined, the volume and weight of the battery pack are relatively large, and the battery is inconvenient to disassemble and assemble when replacing the battery. On the other hand, the size design and processing of the battery compartment of the electric bicycle are basically standardized. Even if there is a difference in power level of the electric bicycle, the size of the battery compartment of the electric bicycle is limited to a limited number of standard values. In order to facilitate the disassembly and assembly of the battery, the present application follows the design idea of dividing the whole into parts, and a proper number of smaller volume and weight battery modules are combined according to the specific size of the battery compartment of the object to be charged to meet the working power demand of the object to be charged. Moreover, the specifications of the battery modules are reasonably limited, which not only makes the charging process more relaxed, convenient and efficient, but also makes the combination of different numbers of battery modules as close as possible to the standard specifications corresponding to the battery compartment of the object to be charged of different power levels, maximizes the use of the battery compartment volume, and better adapts to market demand.

[0005] As a preferred, the battery module includes a shell and an upper cover arranged at the top of the shell, a connecting plate is arranged between the shells of the plurality of connected battery modules, the two ends of the connecting plate are fixed on the shells of the connected battery modules, and the connecting plate and the shells connected with the connecting plate are integrally formed. The method of integral molding can simultaneously complete the generation of multiple shells, improving the production efficiency of the shells. In order to ensure the realization of integral molding, the molds corresponding to different battery module shells need to be connected, and the connecting part between the molds is formed into a connecting plate at the same time of shell molding. The connecting plate not only enables the mold to realize integral molding, but also enables the laser welding positioning of the electrical connecting piece between the series-connected battery modules to be more accurate.

[0006] As a preferred, the connecting plate is strip-shaped and multiple. The battery module needs to be split and reorganized when mounted on the vehicle, and the connecting plate needs to be damaged when split. The strip-shaped connecting plate has a small width, which is convenient to damage, thereby facilitating the disassembly of the shell. Multiple connecting plates can improve the connection strength between the shells and make the laser welding positioning of the electrical connecting piece between the series-connected battery modules more accurate.

[0007] As a preferred, the collection wire harness includes a fixed plug and a wire harness, the wire harness is connected to the fixed plug, and the fixed plug is fixed on the upper cover. The wire harness enters the shell through the upper cover. The fixed plug provides positioning restraint force for the wire harness, and the fixed plug is fixed on the upper cover, which positions the wire harness on the upper cover and then enters the shell at this position, realizing the electrical connection between the collection wire harness and the battery module.

[0008] As preferred, the joint part of the shell and the upper cover is provided with waterproof glue. The waterproof glue can ensure that the battery module has good waterproof performance, so that it can still work normally in bad weather and environment.

[0009] As preferred, the top of the shell is an open structure, and a slot matching structure is arranged between the top of the shell and the upper cover. The slot matching structure includes a waterproof glue slot and a plug, and the waterproof glue is arranged in the waterproof glue slot. The plug is adapted to be plugged into the waterproof glue slot. The slot matching structure not only can enhance the firmness of the cooperation between the shell and the upper cover, but also can facilitate the reliable arrangement of the waterproof glue.

[0010] As preferred, the upper cover is provided with an air tightness detection hole. The air tightness detection hole is used for special detection instrument detection to determine whether the battery can meet the air tightness requirement.

[0011] As preferred, a clamping structure is arranged between the shell and the upper cover. Through the clamping structure, the closure of the battery module can be conveniently and firmly completed.

[0012] As preferred, the battery module is two, one of which is provided with 3-6 series connected battery cells, and the other is provided with 7-10 series connected battery cells. When a single specification battery module is combined, the battery compartment volume often cannot match the total volume of an integer number of battery modules. If one more battery module is placed, it cannot be placed, and if one less module is placed, the battery compartment space is wasted. In this case, the battery modules are differentially manufactured, and multiple specifications of battery modules are used for size matching, which may be more easily matched with the battery compartment. The battery module is configured with different number of battery cells, which not only makes the battery module different in size, but also different in electric energy capacity, realizing the differentiation of the battery module.

[0013] Preferably, the battery compartment accommodates two modular sodium-ion batteries. When installed, the two modular sodium-ion batteries are arranged vertically, with the small modules close to the vertical intersection point. Currently, the most commonly used batteries on the market are typically installed in pairs in a T-shape or L-shape, meaning the two batteries are perpendicular to each other. This allows one battery to simultaneously contact three sides of the electric vehicle's battery compartment, while the other battery can contact the fourth side, thus forming a stable, mutually supporting structure that effectively prevents the batteries from sliding or shifting within the battery compartment. This invention, while retaining existing battery specifications, designs the batteries as separate units, using modular sodium-ion batteries assembled from battery modules to replace the original batteries. The weight and size of the battery modules are smaller than individual batteries, making them easier to handle during installation and removal. Furthermore, they still form a mutually supporting structure within the battery compartment, effectively preventing the batteries from sliding or shifting. Therefore, this invention improves usability while remaining compatible with existing electric vehicle battery compartments and preserving the usage habits of current electric vehicle models. The battery compartments of existing electric vehicles are usually small at the opening and large in the belly, with the opening offset to one side. After the battery is installed, part of it is located under the top plate of the battery compartment. The most reasonable battery loading method is to first install a larger battery module and push it against the inner wall at the far end of the battery compartment, then install a smaller battery module to pair with the previously installed larger module, and finally install another modular sodium-ion battery close to the inner wall at the near end of the battery compartment and the other two inner walls adjacent to the near end. In this way, part of the first installed larger battery module is exposed, and the subsequently installed smaller battery module and the other pair of battery modules are exposed in the battery compartment opening, which facilitates the subsequent data acquisition harness operation.

[0014] The beneficial effects of this utility model are:

[0015] This invention allows for better matching of battery compartments in different vehicle models. It combines an appropriate number of smaller battery modules according to the specific dimensions of the battery compartment of the device being charged, thus meeting the device's power requirements. This not only maximizes the utilization of the battery compartment volume but also makes the charging process easier and more convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0017] Figure 2 This is a schematic diagram of a disassembly structure for applying this utility model.

[0018] Figure 3 This is a schematic diagram of one structure of the upper cover in this utility model.

[0019] Figure 4 This is a schematic diagram of one structure of the shell in this utility model.

[0020] Figure 5 This is a schematic diagram of one structure of the data acquisition harness in this utility model.

[0021] Figure 6 This is a schematic diagram of another structure of the upper cover in this utility model.

[0022] Figure 7 This is a schematic diagram of another structure of the shell in this utility model.

[0023] Figure 8 This is another structural schematic diagram of the present invention.

[0024] In the diagram, 1-battery module, 101-casing, 102-top cover, 103-cell, 104-control board, 105-sloping latch, 106-elastic buckle, 107-connecting plate, 108-handle, 109-handle concealed groove, 110-fixed plug positioning groove, 111-cable socket, 112-waterproof glue groove, 113-lower folded edge, 114-plug tongue, 115-air tightness test hole, 2-data acquisition harness, 201-fixed plug, 202-wire harness, 203-pin. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1:

[0027] like Figures 1 to 5As shown, a modular sodium-ion battery is installed in an electric vehicle. This modular sodium-ion battery includes two battery modules 1 and a matching data acquisition harness 2. The two battery modules 1 are connected in series via the data acquisition harness 2. Both battery modules 1 are cuboid in shape and have different specifications, one large and one small. The dimensions of the large and small battery modules 1 are 180mm×152mm×170mm and 180mm×75mm×170mm, respectively. The battery module 1 includes a housing 101, a top cover 102, battery cells 103, and a control board 104. Multiple series-connected battery cells 103 are arranged vertically inside the housing 101. The control board 104 is located above the battery cells 103. The top of each battery cell 103 is electrically connected to the control board 104 via pins. The top of the control board 104 is also provided with a hub connector, which is electrically connected to each battery cell 103 via wiring on the control board 104. The large battery module 1 contains nine battery cells 103, while the small battery module 1 contains four battery cells 103. The top of the housing 101 is an open structure, and the four edges of the top cover 102 have downward-folded edges 113. The opening edge of the top of the housing 101 has a tongue 114, and the free end of the downward-folded edge 113 has a waterproof adhesive groove 112 containing waterproof adhesive. The tongue 114 is fitted into the waterproof adhesive groove 112. The tongue 114 and the waterproof adhesive groove 112 form a slot-fit structure between the top of the housing 101 and the top cover 102. Through this slot-fit structure, the top cover 102 is fastened to the top of the housing 101. Then, the top cover 102 and the housing 101 are connected by a snap-fit ​​structure, which includes a sloping snap-fit ​​block 105 on the housing 101 and a snap-fit ​​block 105 on the top cover. The elastic buckle 106 on the lower inner edge of the folded edge of 102 and the inclined buckle 105 are integrally injection molded with the shell 101. The inclined buckle 105 is a triangular prism with a right-angled triangle cross-section. One right-angled face of the inclined buckle 105 is connected to the inner wall of the shell 101 and close to the top. The other right-angled face of the inclined buckle 105 faces downward toward the bottom of the shell 101. The normal line of the inclined face on the inclined buckle 105 is inclined upward toward the top opening of the shell 101. The elastic buckle 106 is integrally injection molded with the top cover 102. The elastic buckle 106 has a slot that matches the inclined buckle 105. The inclined buckle 105 is locked in the slot and forms a snap-fit ​​with the elastic buckle 106.

[0028] The end of the data acquisition harness 2 is inserted into the upper cover 102 and electrically connected to the battery cell 103. The data acquisition harness 2 includes a fixing plug 201, a harness 202, and pins 203. The harness 202 is a flexible, bendable harness. There are two fixing plugs 201, with each fixing plug 201 located between the two ends of the harness 202 and its midpoint. The harness 202 is fixedly threaded through the fixing plugs 201. The pins 203 are fixed at both ends of the harness 202. The outer surface of the upper cover 102 is provided with a fixing plug positioning groove 110, which is adapted to the fixing plug 201. The fixing plug positioning groove 110 has a bottom with a wire passage opening. The inner surface of the upper cover 102 is fixed with a wire collection socket 111, which has a socket corresponding to each pin 203. After the wire harness 202 and pin 203 at both ends of the acquisition harness 2 pass through the wire passage and enter the housing 101, the fixing plug 201 is inserted into the fixing plug positioning groove 110. The pin 203 entering the housing 101 is inserted one-to-one with the socket of the hub socket 111, and the pin 203 and the socket are slightly interference-fitted, so that the acquisition harness 2 and the hub socket 111 are electrically connected. The fixing plug 201 and the bottom of the fixing plug positioning groove 110 are further reinforced by screws. The housings 101 of the two battery modules 1 are integrally formed, and a connecting plate 107 integrally formed with the housings 101 is provided between the two housings 101. The connecting plate 107 is located on both sides of the housings 101 and is generated simultaneously during the injection molding of the two housings 101. The connecting piece 107 is strip-shaped, and there are four connecting pieces 107 on each side of the housing 101. The top cover 102 is provided with an airtightness test hole 115 and a handle 108 made of rope. Correspondingly, the bottom cover 102 is also provided with a handle hiding groove 109, which can accommodate the handle 108.

[0029] When the battery product of this utility model is installed on an electric vehicle, under normal circumstances, two battery modules 1 connected by the connecting plate 107 are sent into the battery compartment of the electric vehicle one by one. During this process, the connecting plate 107 is cut and damaged with a blade so that each battery module 1 can be moved independently. Different models and different power electric vehicles require different numbers of battery modules 1. The modular design facilitates more flexible combination and configuration of different numbers of battery modules 1. Open the top cover 102 of each battery module 1, pass the wire harness 202 and the plug 203 at both ends of the acquisition wire harness 2 through the wire passage of the top cover 102 of the battery module 1, and then plug the plug 203 into the corresponding hub socket 111 of each battery module 1. Then fix the fixing plug 201 in the fixing plug positioning groove 110, close the top cover 102, and connect each battery module 1 in series. Finally, all the battery modules 1 connected in series are combined to form a sodium-ion battery that matches the output power, so that the battery compartment volume is finally maximized. The reasonable design of the battery module 1 size in this utility model allows an integer number of battery modules 1 to be accommodated in the standard battery compartment of the electric vehicle. The total floor area occupied by all battery modules 1 after compact installation matches the floor area of ​​the standard battery compartment, and the empty floor area is smaller than the floor area of ​​a single battery module 1. That is, the total floor area occupied by different numbers of battery modules 1 is always very close to the floor area of ​​the standard battery compartment, with a very small empty floor area insufficient to accommodate a single battery module 1. When this utility model is used to replace existing batteries in existing electric vehicles, two modular sodium-ion batteries are used. During installation, a larger battery module is first inserted from the off-center end of the battery compartment opening and placed against the inner wall at the farthest end of the battery compartment. Then, a smaller battery module is inserted to pair with the previously inserted larger module. Finally, another modular sodium-ion battery is inserted, close to the inner wall at the near end of the battery compartment and the other two inner walls adjacent to the near end. The two modular sodium-ion batteries are arranged vertically, forming a T-shape, with the smaller battery module 1 positioned close to the inner wall at the near end of the battery compartment. The near-vertical intersection allows the later-installed modular sodium-ion battery to simultaneously contact three sides of the electric vehicle's battery compartment, while the earlier-installed modular sodium-ion battery can contact the fourth side. This creates a stable, mutually supporting structure between the two modular sodium-ion batteries, effectively preventing them from sliding or shifting within the battery compartment. Furthermore, a portion of the first-installed, larger battery module is exposed, while the subsequently installed smaller battery modules and another pair of battery modules are exposed within the battery compartment opening, facilitating subsequent data acquisition harness operations.

[0030] Example 2:

[0031] like Figure 6 , Figure 7As shown, a modular sodium-ion battery is installed in an electric vehicle. This modular sodium-ion battery includes two battery modules 1 and a matching data acquisition harness 2. The two battery modules 1 are connected in series via the data acquisition harness 2. Both battery modules 1 are cuboid in shape and have different specifications, one large and one small. The dimensions of the large battery module 1 are 180mm×167mm×170mm and 180mm×60mm×170mm, respectively. The battery module 1 includes a housing 101, a top cover 102, battery cells 103, and a control board 104. Multiple series-connected battery cells 103 are arranged vertically inside the housing 101. The control board 104 is located above the battery cells 103. The top of each battery cell 103 is electrically connected to the control board 104 via pins. The top of the control board 104 is also provided with a hub connector, which is electrically connected to each battery cell 103 via wiring on the control board 104. In this embodiment, the large battery module 1 contains ten battery cells 103, and the small battery module 1 contains three battery cells 103. The top of the housing 101 is an open structure that is not closed. The four edges of the top cover 102 have downward folded edges 113. Unlike embodiment 1, the opening edge of the top of the housing 101 is provided with a waterproof glue groove 112. The free end of the downward folded edge 113 is provided with a tongue 114. Waterproof glue is provided in the waterproof glue groove 112. The tongue 114 is adapted to be inserted into the waterproof glue groove 112. The tongue 114 and the waterproof glue groove 112 form a slot-fit structure between the top of the housing 101 and the top cover 102. Through this slot-fit structure, the top cover 102 is fastened to the top of the housing 101. Then, the top cover 102 and the housing 101 are connected by a snap-fit ​​structure. Unlike embodiment 1, this snap-fit ​​structure includes a part located inside the top of the housing 101. The elastic buckle 106 on the top edge of the wall and the inclined buckle 105 located on the inner side of the lower folded edge of the upper cover 102 are provided. The elastic buckle 106 is integrally injection molded with the shell 101 and has a slot that is adapted to the inclined buckle 105. The inclined buckle 105 is integrally injection molded with the upper cover 102 and is a triangular prism. The cross section of the inclined buckle 105 is a right triangle. One right-angled surface of the inclined buckle 105 is connected to the inner wall of the upper cover 102, and the other right-angled surface of the inclined buckle 105 faces upward toward the top of the upper cover 102. The inclined normal line on the inclined buckle 105 is inclined upward toward the top opening of the shell 101. The inclined buckle 105 is locked in the slot and forms a snap-fit ​​with the elastic buckle 106.

[0032] The end of the data acquisition harness 2 is inserted into the upper cover 102 and electrically connected to the battery cell 103. The data acquisition harness 2 includes a fixing plug 201, a harness 202, and pins 203. The harness 202 is a flexible, bendable harness. There are two fixing plugs 201, with each fixing plug 201 located between the two ends of the harness 202 and its midpoint. The harness 202 is fixedly threaded through the fixing plugs 201. The pins 203 are fixed at both ends of the harness 202. The outer surface of the upper cover 102 is provided with a fixing plug positioning groove 110, which is adapted to the fixing plug 201. The fixing plug positioning groove 110 has a bottom with a wire passage opening. The inner surface of the upper cover 102 is fixed with a wire collection socket 111, which has a socket corresponding to each pin 203. After the wire harness 202 and pin 203 at both ends of the acquisition wire harness 2 pass through the wire passage and enter the housing 101, the fixing plug 201 is inserted into the fixing plug positioning groove 110. The pin 203 entering the housing 101 is inserted into the corresponding socket of the hub socket 111, with a slight interference fit between the pin 203 and the socket, so that the acquisition wire harness 2 and the hub socket 111 are electrically connected. The fixing plug 201 and the bottom of the fixing plug positioning groove 110 are further reinforced by screws. The housings 101 of the two battery modules 1 are integrally formed, and a connecting plate 107 integrally formed with the housings 101 is provided between the two housings 101. The connecting plate 107 is located on both sides of the housings 101 and is generated simultaneously during the injection molding of the two housings 101. The connecting plate 107 is strip-shaped, and there are three connecting plates 107 on each side of the housing 101. The upper cover 102 is provided with an airtightness testing hole 115 and a handle 108 made of rope. Correspondingly, the lower cover 102 is also provided with a handle hiding groove 109, which can accommodate the handle 108. The rest is the same as in Embodiment 1.

[0033] When the battery product of this utility model is installed on an electric vehicle, under normal circumstances, two battery modules 1 connected by the connecting plate 107 are sent into the battery compartment of the electric vehicle one by one. During this process, the connecting plate 107 is cut and damaged with a blade so that each battery module 1 can be moved independently. Different models and different power electric vehicles require different numbers of battery modules 1. The modular design facilitates more flexible combination and configuration of different numbers of battery modules 1. Open the top cover 102 of each battery module 1, pass the wire harness 202 and the plug 203 at both ends of the acquisition wire harness 2 through the wire passage of the top cover 102 of the battery module 1, and then plug the plug 203 into the corresponding hub socket 111 of each battery module 1. Then fix the fixing plug 201 in the fixing plug positioning groove 110, close the top cover 102, and connect each battery module 1 in series. Finally, all the battery modules 1 connected in series are combined to form a sodium-ion battery that matches the output power, so that the battery compartment volume is finally maximized. The reasonable design of the size of the battery module 1 in this utility model allows an integer number of battery modules 1 to be accommodated in the standard battery compartment of the electric vehicle. The total area occupied by all battery modules 1 after compact installation matches the internal bottom area of ​​the standard battery compartment. Furthermore, the empty area at the bottom of the battery compartment is smaller than the area occupied by a single battery module 1. In other words, the total area occupied by different numbers of battery modules 1 after installation is always very close to the internal bottom area of ​​the standard battery compartment, and the empty area at the bottom is very small, which is insufficient to accommodate a single battery module 1.

[0034] Example 3:

[0035] like Figure 8As shown, a modular sodium-ion battery differs from Embodiment 1 in that this embodiment includes three cuboid battery modules 1 and a matching data acquisition harness 2. The three battery modules 1 are connected and combined via the data acquisition harness 2. The battery modules 1 have uniform specifications, with dimensions of 180mm × 75mm × 170mm. Each battery module 1 includes a housing 101, a top cover 102, battery cells 103, and a control board 104. Multiple series-connected battery cells 103 are arranged vertically within the housing 101. The control board 104 is located above the battery cells 103. The top of each battery cell 103 is electrically connected to the control board 104 via pins. The top of the control board 104 also has a hub connector, which is electrically connected to each battery cell 103 via wiring on the control board 104. In this embodiment, each battery module 1 contains four battery cells 103. The top of the housing 101 is an open structure that is not closed. The four edges of the top cover 102 have downward folded edges 113. The opening edge of the top of the housing 101 is provided with a tongue 114. The free end of the downward folded edge 113 is provided with a waterproof glue groove 112. Waterproof glue is provided in the waterproof glue groove 112. The tongue 114 is adapted to be inserted into the waterproof glue groove 112. The tongue 114 and the waterproof glue groove 112 form a slot-fit structure between the top of the housing 101 and the top cover 102. Through this slot-fit structure, the top cover 102 is fastened to the top of the housing 101. Then, the top cover 102 and the housing 101 are connected by a snap-fit ​​structure. This snap-fit ​​structure includes a sloping snap block 105 provided on the housing 101 and a snap block 105 provided on the top cover. The elastic buckle 106 on the lower inner edge of the folded edge of 102 and the inclined buckle 105 are integrally injection molded with the shell 101. The inclined buckle 105 is a triangular prism with a right-angled triangle cross-section. One right-angled face of the inclined buckle 105 is connected to the inner wall of the shell 101 and close to the top. The other right-angled face of the inclined buckle 105 faces downward toward the bottom of the shell 101. The normal line of the inclined face on the inclined buckle 105 is inclined upward toward the top opening of the shell 101. The elastic buckle 106 is integrally injection molded with the top cover 102. The elastic buckle 106 has a slot that matches the inclined buckle 105. The inclined buckle 105 is locked in the slot and forms a snap-fit ​​with the elastic buckle 106.

[0036] The end of the data acquisition harness 2 is inserted into the upper cover 102 and electrically connected to the battery cell 103. The data acquisition harness 2 includes a fixing plug 201, a harness 202, and pins 203. The harness 202 is a flexible, bendable harness. There are two fixing plugs 201, with each fixing plug 201 located between the two ends of the harness 202 and its midpoint. The harness 202 is fixedly threaded through the fixing plugs 201. The pins 203 are fixed at both ends of the harness 202. The outer surface of the upper cover 102 is provided with a fixing plug positioning groove 110, which is adapted to the fixing plug 201. The fixing plug positioning groove 110 has a bottom with a wire passage opening. The inner surface of the upper cover 102 is fixed with a wire collection socket 111, which has a socket corresponding to each pin 203. After the wire harness 202 and pin 203 at both ends of the acquisition wire harness 2 pass through the wire passage and enter the housing 101, the fixing plug 201 is inserted into the fixing plug positioning groove 110. The pin 203 entering the housing 101 is inserted into the socket of the hub socket 111 one by one, with a slight interference fit between the pin 203 and the socket, so that the acquisition wire harness 2 and the hub socket 111 form an electrical connection. The fixing plug 201 and the bottom of the fixing plug positioning groove 110 are also connected by screws for further reinforcement. Unlike embodiment 1, in this embodiment, the housings 101 of the three battery modules 1 are integrally formed. A connecting plate 107 integrally formed with the housings 101 is provided between the three housings 101. The connecting plate 107 is located on both sides of the housing 101 and is generated simultaneously during the injection molding of the three housings 101. The connecting plate 107 is strip-shaped, and there are four connecting plates 107 on each side of the housing 101. The upper cover 102 is provided with an airtightness test hole 115 and a plastic handle 108. Correspondingly, the lower cover 102 is also provided with a handle hiding groove 109, which can accommodate the handle 108. The rest is the same as in Embodiment 1.

[0037] When the battery product of this utility model is installed on an electric vehicle, under normal circumstances, two battery modules 1 connected by the connecting plate 107 are sent into the battery compartment of the electric vehicle one by one. During this process, the connecting plate 107 is cut and damaged with a blade so that each battery module 1 can be moved independently. Different models and different power electric vehicles require different numbers of battery modules 1. The modular design facilitates more flexible combination and configuration of different numbers of battery modules 1. Open the top cover 102 of each battery module 1, pass the wire harness 202 and the plug 203 at both ends of the acquisition wire harness 2 through the wire passage of the top cover 102 of the battery module 1, and then plug the plug 203 into the corresponding hub socket 111 of each battery module 1. Then fix the fixing plug 201 in the fixing plug positioning groove 110, close the top cover 102, and connect each battery module 1 in series. Finally, all the battery modules 1 connected in series are combined to form a sodium-ion battery that matches the output power, so that the battery compartment volume is finally maximized. The reasonable design of the size of the battery module 1 in this utility model allows an integer number of battery modules 1 to be accommodated in the standard battery compartment of the electric vehicle. The total area occupied by all battery modules 1 after compact installation matches the internal bottom area of ​​the standard battery compartment. Furthermore, the empty area at the bottom of the battery compartment is smaller than the area occupied by a single battery module 1. In other words, the total area occupied by different numbers of battery modules 1 after installation is always very close to the internal bottom area of ​​the standard battery compartment, and the empty area at the bottom is very small, which is insufficient to accommodate a single battery module 1.

[0038] Example 4:

[0039] The large battery module 1 contains eight battery cells 103, and the small battery module 1 contains five battery cells 103. The dimensions of the large and small battery modules 1 are 180mm×137mm×170mm and 180mm×90mm×170mm, respectively. The rest is the same as in Example 1.

[0040] Example 5:

[0041] The large battery module 1 contains seven battery cells 103, and the small battery module 1 contains six battery cells 103. The dimensions of the large and small battery modules 1 are 180mm×122mm×170mm and 180mm×105mm×170mm, respectively. The rest is the same as in Example 1.

Claims

1. A modular sodium-ion battery, installed in an electric vehicle, characterized in that, It includes multiple battery modules (1) connected by a collection harness (2). The total area occupied by the battery modules (1) when they are compactly installed in the battery compartment of the electric vehicle is matched with the area of ​​the bottom of the battery compartment, and the empty area of ​​the bottom of the battery compartment is smaller than the area occupied by a single battery module (1).

2. The modular sodium-ion battery according to claim 1, characterized in that, The battery module (1) includes a housing (101) and a top cover (102) on the top of the housing (101). A connecting plate (107) is provided between the housings (101) of the battery module (1). The two ends of the connecting plate (107) are respectively fixed on the housings (101) of the connected battery module (1). The connecting plate (107) and the housing (101) connected to the connecting plate (107) are integrally formed.

3. The modular sodium-ion battery according to claim 2, characterized in that, The connecting plates (107) are strip-shaped and there are multiple of them.

4. The modular sodium-ion battery according to claim 2, characterized in that, The acquisition harness (2) includes a fixing plug (201) and a harness (202). The harness (202) is threaded through the fixing plug (201). The fixing plug (201) is fixed to the upper cover (102). The harness (202) passes through the upper cover (102) and enters the housing (101).

5. The modular sodium-ion battery according to claim 2, characterized in that, Waterproof adhesive is provided at the joint between the housing (101) and the top cover (102).

6. The modular sodium-ion battery according to claim 2, characterized in that, The top of the housing (101) is an open structure. A slot mating structure is provided between the top of the housing (101) and the top cover (102). The slot mating structure includes a waterproof glue groove (112) and a tongue (114). The waterproof glue is located in the waterproof glue groove (112). The tongue (114) is adapted to be inserted into the waterproof glue groove (112).

7. The modular sodium-ion battery according to claim 2, characterized in that, The top cover (102) is provided with an airtightness testing hole (115).

8. The modular sodium-ion battery according to claim 2, characterized in that, A snap-fit ​​structure is provided between the housing (101) and the top cover (102).

9. The modular sodium-ion battery according to any one of claims 1 to 8, characterized in that, There are two battery modules (1), one of which contains 3-6 cells connected in series, and the other contains 7-10 cells connected in series.

10. The modular sodium-ion battery according to claim 9, characterized in that, The battery compartment accommodates two modular sodium-ion batteries. When installed in the battery compartment, the two modular sodium-ion batteries are arranged vertically, with the smaller battery module (1) close to the vertical intersection point.

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