Modularized structure of sodium ion storage battery

Abstract

The modular structure comprises a plurality of battery modules, the battery modules are connected and combined through a quick-plug wire harness, each battery module comprises a shell and an upper cover which is mounted at the top of the shell and is provided with a caulking groove, battery cells which are connected in series to form a group are arranged in the shell, the quick-plug wire harness comprises a pair of insert blocks and a wire, pins are fixed on the insert blocks, and the insert blocks are connected with the upper cover through the quick-plug wire harness. The pins of the two embedded blocks are connected in a one-to-one correspondence manner through wires, the embedded blocks are embedded into the embedding grooves in a matched manner, and the pins are electrically connected with the battery cell. According to the specific size of a battery compartment of an electricity loading object, a proper number of battery modules with smaller volumes are combined to meet the working electric energy requirement of the electricity loading object, so that the volume of the battery compartment can be utilized to the greatest extent, and the electricity loading process is easier, more convenient and more efficient. And the end of the quick-plug series rubber plug wire harness is inserted into the upper cover and can be electrically connected with the battery core, so that the electric connection between the battery modules is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and more particularly to a modular structure of a sodium ion storage battery. Background Art

[0002] According to the latest market research and industry analysis, the future development trend of the electric vehicle industry is that, on the one hand, with the advancement of technology and the improvement of consumer awareness, the market demand for electric vehicles will continue to grow, and the market scale will continue to expand; on the other hand, technological advances such as innovation in battery technology, improvement of charging infrastructure, and application of intelligent driving technology will promote the continuous development of the industry, especially battery technology, whose increased energy density and reduced cost will directly improve the performance of electric vehicles, thereby increasing market acceptance. Compared with traditional lead-acid batteries, sodium-ion batteries have the characteristics of high energy density, light weight, and low cost. They have huge market competitive advantages over lead-acid batteries and are expected to quickly replace lead-acid batteries in the two-wheeled and three-wheeled electric vehicle market. At present, the market has not yet formulated a unified standard for sodium batteries, and the battery compartment sizes of two-wheeled and three-wheeled electric vehicles of different brands are also different. It is difficult to configure a sodium battery pack of uniform size. It must be composed of smaller battery modules into a battery pack of appropriate size. In this process, cumbersome series wiring harness wiring is required, which is inconvenient to operate. The invention patent with publication number CN115241612A discloses a battery module and battery pack. The invention uses an FPC acquisition board to transfer the internal connection of the battery module, which reduces the space of the module series wiring harness and is conducive to improving the efficiency of the module series and parallel connection. However, the method of using the FPC acquisition board to transfer the internal connection of the battery module in the invention is only suitable for application in the battery production process. At the consumer end, due to the constraints of tools, facilities, working environment and other factors, it is not suitable for users to use the FPC acquisition board to connect the battery module in series when performing daily battery pack replacement operations. Summary of the invention

[0003] In the prior art, when installing a battery pack on an electric vehicle, cumbersome series wiring harness wiring is required, which is inconvenient to operate. To overcome this defect, the present invention provides a modular structure of a sodium ion battery, which can simplify the wiring operation of the series wiring harness and improve the installation efficiency of the battery module.

[0004] The technical solution of the present invention is: a modular structure of a sodium ion battery, including a plurality of battery modules, the battery modules are connected and combined by a quick-plug wiring harness, the battery module includes a shell and an upper cover installed on the top of the shell and having an embedding groove, the shell is provided with a battery cell connected in series, the quick-plug wiring harness includes a pair of blocks and wires, the blocks are fixed with pins, the pins of the two blocks are connected one by one through the wires, the blocks are adapted to be embedded in the embedding groove, and the pins are electrically connected to the battery cell. According to the specific size of the battery compartment of the power installation object, an appropriate number of smaller battery modules are combined to meet the working power demand of the power installation object, which can not only maximize the use of the battery compartment volume, but also make the power installation process easier, more convenient and more efficient. The end of the quick-plug wiring harness can be electrically connected to the battery cell by plugging it into the upper cover, thereby realizing the electrical connection between the battery modules. With the quick-plug wiring harness, only a simple plug-in operation is required to establish an electrical connection between the battery modules, which can avoid the cumbersome wiring process, thereby simplifying the wiring operation of the series wiring harness and greatly improving the installation efficiency of the battery module.

[0005] Preferably, the quick-plug wiring harness also includes a wiring tube, the insert blocks are fixed at both ends of the wiring tube, the wires are passed through the wiring tube, a relay socket is provided below the bottom of the insert groove, and the pins are electrically connected to the relay socket. The insert block is inserted into the insert groove, and the insert groove can limit the insert block to ensure that the pins are accurately connected to the relay socket, thereby realizing the electrical connection between the quick-plug wiring harness and the battery cell, and even between the battery modules.

[0006] Preferably, screws are connected between the embedding block and the bottom of the embedding groove. Installing screws between the embedding block and the bottom of the embedding groove can strengthen the connection between the quick-insert wiring harness and the battery module.

[0007] Preferably, a clamping block is provided on the housing, and a buckle is provided on the upper cover to be clamped with the clamping block. The housing and the upper cover can be quickly connected by clamping the clamping block and the buckle.

[0008] As another option, a buckle is provided on the shell, and a clamping block engaged with the buckle is provided on the upper cover.

[0009] Preferably, the multiple shells are connected as a whole through a connecting piece, and the shell and the connecting piece are integrally formed. The integral forming method can synchronously complete the production of multiple shells, thereby improving the production efficiency of the shells.

[0010] Preferably, the connecting piece is in strip shape and there are multiple pieces. The battery module needs to be disassembled and reassembled when it is assembled on the vehicle, and the connecting piece needs to be destroyed during disassembly. The strip connecting piece is small in width and easy to destroy, which makes it convenient to disassemble the shell. Multiple connecting pieces can also improve the connection strength between the shells, making the laser welding positioning of the electrical connectors between the battery modules in series more accurate.

[0011] Preferably, a handle is provided on the upper cover to facilitate carrying the battery and loading and unloading of the battery.

[0012] Preferably, there are two battery modules, and the two battery modules constitute a combined unit, wherein one battery module contains 3-6 cells, and the other battery module contains 7-10 cells. The combination of battery modules of a single specification often encounters the embarrassing situation that the volume of the battery compartment cannot match the total volume of an integer number of battery modules. One more battery module cannot be put in, and one less module wastes the battery compartment space. In this case, the battery modules are manufactured in a differentiated manner, and the size of battery modules of various specifications may be more easily matched with the battery compartment. Configuring different numbers of cells in the battery module not only makes the battery module size different, but also the electric energy capacity different, thereby realizing the differentiation of the battery modules.

[0013] Preferably, the sodium ion battery is installed in the battery compartment of the electric vehicle, and the battery compartment accommodates two of the combination units. When loaded into the battery compartment, the two combination units are arranged vertically, and the small module is close to the vertical intersection. The most commonly used batteries on the market are generally placed in two pieces in a T shape or L shape when loaded, that is, the two batteries are perpendicular to each other, so that one battery can contact three surfaces of the battery compartment of the electric vehicle at the same time, and the other battery can touch the fourth surface of the battery compartment of the electric vehicle, so that the two batteries form a stable mutual support structure, effectively preventing the battery from sliding and shifting in the battery compartment. On the basis of continuing to use the existing battery specifications, the present invention splits the battery design, and replaces the original battery with a modular sodium ion battery composed of a battery module. The weight and size of the battery module are both smaller than a single battery, which is not only easier to operate during loading and unloading, but also can still form a mutual support structure in the battery compartment, effectively preventing the battery from sliding and shifting in the battery compartment. Therefore, the present invention is compatible with the existing electric vehicle battery compartment and retains the usage habits of existing electric vehicles, thereby improving the convenience of use. The battery compartment of an existing electric vehicle usually has a small opening and a large belly, and the battery compartment opening is offset to one side. After the battery is installed, a 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 hold it against the inner wall at the farthest end of the battery compartment, then install a smaller battery module to pair with the previously installed large module, and finally install another modular sodium-ion battery, close to the inner wall near the proximal end of the battery compartment and the other two inner walls adjacent to the proximal inner wall. In this way, a part of the larger battery module installed first is exposed, and the smaller battery module and another pair of battery modules installed subsequently are all exposed in the battery compartment opening, which is convenient for the subsequent collection harness operation.

[0014] The beneficial effects of the present invention are: Better matching of battery compartments of different models. The present invention can combine an appropriate number of smaller battery modules according to the specific size of the battery compartment of the object to be powered, so as to meet the working power demand of the object to be powered, which can not only maximize the use of the battery compartment volume, but also make the power installation process easier and more convenient.

[0015] Improve the installation efficiency of the battery module. The present invention adopts a quick-plug wiring harness, which only requires a simple plug-in operation to establish an electrical connection between the battery modules, avoiding cumbersome wiring processes, thereby simplifying the wiring operation of the series wiring harness and greatly improving the installation efficiency of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of the present invention.

[0017] Figure 2 The figure is a schematic diagram of a disassembly structure of the present invention.

[0018] Figure 3 It is a structural schematic diagram of the upper cover in the present invention.

[0019] Figure 4 It is a structural schematic diagram of the shell in the present invention.

[0020] Figure 5 It is a schematic diagram of the outer surface structure of the upper cover in the present invention.

[0021] Figure 6 It is a schematic diagram of the inner surface structure of the upper cover in the present invention.

[0022] Figure 7 It is a structural schematic diagram of the quick-plug wiring harness in the present invention.

[0023] Figure 8 It is another structural schematic diagram of the upper cover in the present invention.

[0024] Fig. 9 Another structural schematic diagram of the shell in the present invention.

[0025] Fig.10 The present invention is a schematic structural diagram of the locking and unlocking mechanism of the quick-plug wiring harness.

[0026] Fig.11 Another structural schematic diagram of the present invention.

[0027] In the figure, 1-battery module, 101-shell, 102-upper cover, 103-battery cell, 104-control board, 105-block, 106-buckle, 107-connecting plate, 108-handle, 109-handle hidden groove, 110-embedded groove, 111-relay socket, 2-quick-plug wiring harness, 201-embedded block, 202-wiring tube, 203-pin, 204-locking pin, 205-sliding frame, 206-rectangular frame, 207-sleeve, 208-sliding rod, 209-first support rod, 210-second support rod. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to specific embodiments of the accompanying drawings.

[0029] Embodiment 1: like Figures 1 to 7 As shown, a modular structure of a sodium ion battery comprises two rectangular battery modules 1 and matching quick-plug wiring harnesses 2, and the two battery modules 1 are connected and combined by the quick-plug wiring harnesses 2. The battery module 1 has two specifications, one large and one small. The larger battery module 1 has a size of 180mm×152mm×170mm, and the smaller battery module 1 has a size of 180mm×75mm×170mm. The battery module 1 comprises a housing 101, an upper cover 102, battery cells 103 and a control board 104. The battery cells 103 are arranged upright in groups and connected in series in the housing 101. The control board 104 is placed above the battery cells 103 and connected to each battery cell 103 through a pin. A central line connector is also provided on the top of the control board 104, and the central line connector is electrically connected to each battery cell 103 through the line on the control board 104. There are nine battery cells 103 in the larger battery module 1, and four battery cells 103 in the smaller battery module 1. The upper cover 102 is installed on the top of the shell 101. The four sides of the upper cover 102 have downward folded edges. A clamping structure is provided between the upper cover 102 and the shell 101. The clamping structure includes a clamping block 105 and a buckle 106. The clamping block 105 is provided on the shell 101 and is integrally injection-molded with the shell 101. The clamping block 105 is a cylinder with a right-angled triangle cross section. One right-angled surface of the clamping block 105 is connected to the inner wall of the shell 101 and is close to the top opening edge of the shell 101. The other right-angled surface of the clamping block 105 is downwardly facing the bottom of the shell 101. The inclined surface on the clamping block 105 is inclined upwardly toward the top opening of the shell 101; the buckle 106 is provided on the inner lower edge of the folded edge of the upper cover 102 and is integrally injection-molded with the upper cover 102. The buckle 106 has a bayonet, which is adapted to the clamping block 105. The clamping block 105 is clamped in the bayonet to connect the upper cover 102 with the shell 101.

[0030] The end of the quick-plug harness 2 is plugged into the upper cover 102 and electrically connected to the battery cell 103. The quick-plug harness 2 includes an insert 201, a wiring tube 202 and a pin 203. The wiring tube 202 is a U-shaped metal tube. The inserts 201 are arranged in pairs and the two inserts 201 in each pair are respectively fixed at both ends of the wiring tube 202. The pin 203 is fixed on the insert 201. The wiring tube 202 is penetrated by a wire, and the wire is connected to the pin 203 in a one-to-one correspondence. The outer surface of the upper cover 102 is provided with an embedding groove 110, which is adapted to the embedding block 201. The embedding groove 110 has a groove bottom, and a wire passing port is provided on the groove bottom. A relay socket 111 is fixed on the inner surface of the upper cover 102. The relay socket 111 is connected to the said line collection connector through a wire. The relay socket 111 is provided with a jack corresponding to the pin 203. The relay socket 111 is located below the groove bottom of the embedding groove 110 and is observed outside the wire passing port. The jacks are all visible. The embedding block 201 is embedded in the embedding groove 110, and the pin 203 is plugged in one by one with the jack of the relay socket 111. The pin 203 and the jack form a slight interference fit, so that the quick-plug wiring harness 2 is electrically connected to the relay socket 111. Screws are connected between the embedding block 201 and the groove bottom of the embedding groove 110. A connecting piece 107 is provided between the shells 101 of the two battery modules 1. The connecting piece 107 is located on both sides of the shell 101. The two ends of the connecting piece 107 are respectively connected to the two shells 101. The two shells 101 and the connecting piece 107 are integrally formed. The connecting piece 107 is in a strip shape and there are four connecting pieces 107 on each side of the shell 101. They are generated simultaneously during the injection molding of the two shells 101. A handle 108 and a handle hidden groove 109 are provided on the upper cover 102. The handle 108 is made of a rope, and the handle hidden groove 109 can accommodate the handle 108 to be hidden.

[0031] When the sodium ion storage battery of the present invention is installed on an electric vehicle, two battery modules 1 are normally put into the battery compartment of the electric vehicle one by one as a combined unit. During this process, the quick-plug wiring harness 2 is not installed temporarily, and the connecting piece 107 between the battery modules 1 is broken with a cutting tool, so that the two battery modules 1 in each combined unit are disassembled, each independent, and can be moved separately. Different models and different powers of 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. After the battery module 1 is installed, the gap is filled and the battery module is positioned and reinforced, and then the quick-plug wiring harness 2 can be installed. During installation, first align and press the block 201 of the quick-plug wiring harness 2 with the corresponding groove 110, and use the groove 110 to radially and circumferentially position the block 201 to quickly complete the precise docking of the pin 203 of the quick-plug wiring harness 2 and the jack of the relay socket 111. Finally, screws are installed on the block 201 to further reinforce the connection between the quick-plug wiring harness 2 and the relay socket 111. When the present invention is used to replace the existing storage battery in an existing electric vehicle, two of the combination units are used. When loading the vehicle, a larger battery module 1 is first loaded from the battery compartment opening at one end offset from the electric vehicle and against the inner wall at the far end of the battery compartment, and then a smaller battery module 1 is loaded to be paired with the previous module. Finally, another combination unit is loaded in the same way, close to the other three inner walls of the battery compartment. The two combination units are arranged vertically to form a T shape, and the smaller battery module 1 is close to the vertical intersection. In this way, the two combination units can form a stable mutually supporting structure and effectively prevent the combination units from sliding and shifting in the battery compartment, and the battery module 1 that is first loaded can be partially exposed within the range of the battery compartment opening, and the three battery modules 1 that are loaded later are all exposed within the range of the battery compartment opening, thereby facilitating the subsequent implementation of the quick-plug wiring harness 2 installation operation.

[0032] Embodiment 2: like Figure 8 , Fig. 9As shown, a modular structure of a sodium ion battery includes two rectangular battery modules 1 and matching quick-plug wiring harnesses 2, and the two battery modules 1 are connected and combined by the quick-plug wiring harness 2. The battery module 1 has two specifications, one large and one small. The larger battery module 1 has a size of 180mm×167mm×170mm, and the smaller battery module 1 has a size of 180mm×60mm×170mm. The battery module 1 includes a shell 101, an upper cover 102, battery cells 103 and a control board 104. The battery cells 103 are arranged upright in groups and connected in series in the shell 101. The control board 104 is placed above the battery cells 103 and connected to each battery cell 103 through a pin. A collection connector is also provided on the top of the control board 104, and the collection connector is electrically connected to each battery cell 103 through the line on the control board 104. In this embodiment, there are ten battery cells 103 in the larger battery module 1, and three battery cells 103 in the smaller battery module 1. The upper cover 102 is mounted on the top of the housing 101. The upper cover 102 has downward folded edges on four sides. A snap-fit ​​structure is provided between the upper cover 102 and the housing 101. The snap-fit ​​structure includes a snap block 105 and a snap buckle 106. Different from the first embodiment, the snap buckle 106 in the present embodiment is provided on the housing 101 and is integrally injection molded with the housing 101. The snap block 105 is provided on the upper cover 102 and is integrally injection molded with the upper cover 102. The snap block 105 is a straight cross section. The block 105 is a right-angled column with a right-angled surface connected to the inner wall of the folded edge of the upper cover 102, and the other right-angled surface of the block 105 faces upward toward the top of the upper cover 102. The normal line of the inclined surface on the block 105 is inclined downward to point to the bottom of the shell 101; the buckle 106 is located at the edge of the top opening of the shell 101, and the buckle 106 has a bayonet, which is adapted to the block 105. The block 105 is snapped into the bayonet to connect the upper cover 102 with the shell 101.

[0033] The end of the quick-plug harness 2 is plugged into the upper cover 102 and electrically connected to the battery cell 103. The quick-plug harness 2 includes an insert 201, a wiring tube 202 and a pin 203. The wiring tube 202 is a U-shaped metal tube. The inserts 201 are arranged in pairs and the two inserts 201 in each pair are respectively fixed at both ends of the wiring tube 202. The pin 203 is fixed on the insert 201. The wiring tube 202 is penetrated by a wire, and the wire is connected to the pin 203 in a one-to-one correspondence. The outer surface of the upper cover 102 is provided with an embedding groove 110, which is adapted to the embedding block 201. The embedding groove 110 has a groove bottom, and a wire passing port is provided on the groove bottom. A relay socket 111 is fixed on the inner surface of the upper cover 102. The relay socket 111 is connected to the said line collection connector through a wire. The relay socket 111 is provided with a jack corresponding to the pin 203. The relay socket 111 is located below the groove bottom of the embedding groove 110 and is observed outside the wire passing port. The jacks are all visible. The embedding block 201 is embedded in the embedding groove 110, and the pin 203 is plugged in one by one with the jack of the relay socket 111. The pin 203 and the jack form a slight interference fit, so that the quick-plug wiring harness 2 is electrically connected to the relay socket 111. Screws are connected between the embedding block 201 and the groove bottom of the embedding groove 110. A connecting piece 107 is provided between the shells 101 of the two battery modules 1. The connecting piece 107 is located on both sides of the shell 101. The two ends of the connecting piece 107 are respectively connected to the two shells 101. The two shells 101 and the connecting piece 107 are integrally formed. The connecting piece 107 is in a strip shape and there are four connecting pieces 107 on each side of the shell 101. They are generated synchronously during the injection molding of the two shells 101. A handle 108 and a handle hidden groove 109 are provided on the upper cover 102. The handle 108 is made of a rope, and the handle hidden groove 109 can accommodate the handle 108 to be hidden. The rest is the same as in Example 1.

[0034] When the sodium ion storage battery of the present invention is installed on an electric vehicle, two battery modules 1 are normally combined into a battery compartment of the electric vehicle one by one. During this process, the quick-plug harness 2 is not installed temporarily. After the battery module 1 is installed, the gap is filled and the battery module is positioned and reinforced, and then the quick-plug harness 2 can be installed. During installation, the insert block 201 of the quick-plug harness 2 is first aligned with the corresponding insert groove 110 and pressed. With the help of the radial and circumferential positioning of the insert block 201 by the insert groove 110, the pin 203 of the quick-plug harness 2 and the socket of the relay socket 111 are quickly and accurately connected. Finally, screws are installed on the insert block 201 to further reinforce the connection between the quick-plug harness 2 and the relay socket 111.

[0035] Embodiment 3: A modular structure of a sodium ion battery comprises two rectangular battery modules 1 and a matching quick-plug wiring harness 2, wherein the two battery modules 1 are connected and combined by the quick-plug wiring harness 2. The battery module 1 has two specifications, one large and one small, wherein the larger battery module 1 has a size of 180 mm × 137 mm × 170 mm, and the smaller battery module 1 has a size of 180 mm × 90 mm × 170 mm. The battery module 1 comprises a housing 101, an upper cover 102, battery cells 103 and a control board 104, wherein the battery cells 103 are arranged upright in groups and connected in series in the housing 101, and the control board 104 is placed above the battery cells 103 and connected to each battery cell 103 through a pin, and a central line connector is also provided on the top of the control board 104, and the central line connector is electrically connected to each battery cell 103 through the line on the control board 104. In this embodiment, there are eight battery cells 103 in the larger battery module 1, and there are five battery cells 103 in the smaller battery module 1. The upper cover 102 is installed on the top of the shell 101. The four sides of the upper cover 102 have downward folded edges. A clamping structure is provided between the upper cover 102 and the shell 101. The clamping structure includes a clamping block 105 and a buckle 106. The clamping block 105 is provided on the shell 101 and is integrally injection-molded with the shell 101. The clamping block 105 is a cylinder with a right-angled triangle cross section. One right-angled surface of the clamping block 105 is connected to the inner wall of the shell 101 and close to the top opening edge of the shell 101. The other right-angled surface of the clamping block 105 is downward toward the bottom of the shell 101. The inclined surface on the clamping block 105 is inclined upward toward the top opening of the shell 101; the buckle 106 is provided on the upper cover 102 and is integrally injection-molded with the upper cover 102. The buckle 106 has a bayonet, which is adapted to the clamping block 105. The clamping block 105 is clamped in the bayonet to connect the upper cover 102 with the shell 101.

[0036] The end of the quick-plug harness 2 is plugged into the upper cover 102 and electrically connected to the battery cell 103. The quick-plug harness 2 includes an insert 201, a wiring tube 202 and a pin 203. The wiring tube 202 is a U-shaped metal tube. The inserts 201 are arranged in pairs and the two inserts 201 in each pair are respectively fixed at both ends of the wiring tube 202. The pin 203 is fixed on the insert 201. The wiring tube 202 is penetrated by a wire, and the wire is connected to the pin 203 in a one-to-one correspondence. The outer surface of the upper cover 102 is provided with an embedding groove 110, and the embedding groove 110 is adapted to the embedding block 201. The embedding groove 110 has a groove bottom, and a wire passing port is provided on the groove bottom. A relay socket 111 is fixed on the inner surface of the upper cover 102. The relay socket 111 is connected to the said line collection connector through a wire. The relay socket 111 is provided with a jack corresponding to the pin 203 one by one. The relay socket 111 is located below the groove bottom of the embedding groove 110 and is visible when observed from outside the wire passing port. The embedding block 201 is embedded in the embedding groove 110, and the pin 203 is plugged into the jack of the relay socket 111 one by one. There is a slight interference fit between the pin 203 and the jack, so that the quick-plug wiring harness 2 is electrically connected to the relay socket 111. Different from the embodiment 1, in this embodiment, the embedding block 201 and the end wall of the embedding groove 110 can be locked and unlocked by a locking pin 204, such as Fig.10As shown, a sliding frame 205 is slidably connected to each end of the insert 201. The sliding frame 205 can be U-shaped, including a pair of slides and a frame body fixedly connected between the slides. The sliding frame 205 can also be C-shaped, including a frame body and side panels formed by bending at both ends of the frame body. The slide plate and the side of the insert 201 are slidably connected through a slide groove structure. The locking pin 204 is fixed to the frame end of the sliding frame 205 and points to the end wall of the embedding groove 110 corresponding to the sliding frame 205. The end wall of the embedding groove 110 is provided with a lock hole for accommodating the locking pin 204 to be inserted. A rectangular frame 206 is fixedly connected between the two inserts 201 of the quick-connect wiring harness 2. A sleeve 207 with an opening facing downward is fixed on the top of the rectangular frame 206. The sleeve 207 is located at the center of the inner surface of the top of the rectangular frame 206. A spring-driven sliding rod 208 is slidably connected in the sleeve 207. The spring is located in the sleeve 207. One end of the spring abuts against the sliding rod 208, and the other end abuts against the top of the sleeve 207. A convex ring can also be provided on the exposed part of the slide bar 208, and a spring can be provided on the bottom end surface of the sleeve 207, with one end of the spring abutting against the convex ring and the other end abutting against the end surface of the sleeve 207. The bottom end of the slide bar 208 is hinged to the top of a pair of first struts 209. The first struts 209 correspond to the insert block 201 one by one, and a second strut 210 is hinged to the inner side of each slide frame 205 respectively, and the second struts 210 on the same insert block 201 are hinged to the bottom end of the corresponding first strut 209. The common hinged end of the second strut 210 is slidably connected to a slide groove at the bottom of the rectangular frame 206. A connecting piece 107 is provided between the shells 101 of the two battery modules 1, and the connecting piece 107 is located on both sides of the shell 101. The two ends of the connecting piece 107 are respectively connected to the two shells 101, and the two shells 101 and the connecting piece 107 are integrally formed. The connecting piece 107 is strip-shaped and there are three connecting pieces 107 on each side of the housing 101, which are simultaneously formed during the injection molding of the two housings 101. The upper cover 102 is provided with a handle 108 and a handle hidden groove 109, the handle 108 is made of a rope, and the handle hidden groove 109 can accommodate the handle 108 to be hidden. The rest is the same as in Example 1.

[0037] When the sodium ion storage battery of the present invention is installed on an electric vehicle, two battery modules 1 are normally combined as a unit and are fed into the battery compartment of the electric vehicle one by one. During this process, the quick-plug wiring harness 2 is not installed temporarily. After the battery module 1 is installed, the gap is filled and the battery module is positioned and reinforced. Then the quick-plug wiring harness 2 can be installed. During installation, first press the slide bar 208 upward with your fingers. The slide bar 208 drives the first support rod 209 to retract, and then drives the two pairs of second support rods 210 to retract respectively, so that the sliding frames 205 on each insert 201 are close to each other, and the locking pin 204 retracts, which will not hinder the insert 201 from being inserted into the embedding groove 110. Then align the insert 201 of the quick-plug wiring harness 2 with the corresponding embedding groove 110 and press it down. With the help of the embedding groove 110, the radial and circumferential positioning of the insert 201 is quickly completed. The pin 203 of the quick-plug harness 2 is precisely docked with the jack of the relay socket 111, and finally the top pressure on the slide bar 208 is released. The slide bar 208 is pushed down by the spring, and the slide bar 208 pushes the two first support rods 209 to expand outward, and the first support rod 209 pushes the second support rod 210 to expand outward, so that the sliding frames 205 on each insert block 201 are moved away from each other, and the locking pin 204 moves with the sliding frame 205 and extends out of the insert block 201, and is inserted into the locking hole on the end wall of the insert groove 110, so that the insert block 201 is locked with the insert groove 110, thereby further strengthening the connection between the quick-plug harness 2 and the relay socket 111. Through the locking pin 204, the quick-plug harness 2 can be locked and reinforced after plugging, and unlocked and disassembled without tools.

[0038] Embodiment 4: like Fig.11As shown, a modular structure of a sodium ion battery is different from Example 1 in that the modular structure of the sodium ion battery in this embodiment includes three rectangular battery modules 1 and matching quick-plug wiring harnesses 2, and the three battery modules 1 are connected and combined by the quick-plug wiring harness 2. The battery module 1 has a uniform specification and a size of 180mm×75mm×170mm. The battery module 1 includes a shell 101, an upper cover 102, battery cells 103 and a control board 104. The battery cells 103 are arranged upright in groups and connected in series in the shell 101. The control board 104 is placed above the battery cells 103 and connected to each battery cell 103 through a pin. A collection connector is also provided on the top of the control board 104, and the collection connector is electrically connected to each battery cell 103 through the line on the control board 104. In this embodiment, there are four battery cells 103 in each battery module 1. The upper cover 102 is installed on the top of the shell 101. The four sides of the upper cover 102 have downward folded edges. A clamping structure is provided between the upper cover 102 and the shell 101. The clamping structure includes a clamping block 105 and a buckle 106. The clamping block 105 is provided on the shell 101 and is integrally injection-molded with the shell 101. The clamping block 105 is a cylinder with a right-angled triangle cross section. One right-angled surface of the clamping block 105 is connected to the inner wall of the shell 101 and close to the top opening edge of the shell 101. The other right-angled surface of the clamping block 105 is downward toward the bottom of the shell 101. The inclined surface on the clamping block 105 is inclined upward toward the top opening of the shell 101; the buckle 106 is provided on the upper cover 102 and is integrally injection-molded with the upper cover 102. The buckle 106 has a bayonet, which is adapted to the clamping block 105. The clamping block 105 is clamped in the bayonet to connect the upper cover 102 with the shell 101.

[0039] The end of the quick-plug harness 2 is plugged into the upper cover 102 and electrically connected to the battery cell 103. The quick-plug harness 2 includes an insert 201, a wiring tube 202 and a pin 203. The wiring tube 202 is a U-shaped metal tube. The inserts 201 are arranged in pairs and the two inserts 201 in each pair are respectively fixed at both ends of the wiring tube 202. The pin 203 is fixed on the insert 201. The wiring tube 202 is penetrated by a wire, and the wire is connected to the pin 203 in a one-to-one correspondence. The outer surface of the upper cover 102 is provided with an embedding groove 110, which is adapted to the embedding block 201. The embedding groove 110 has a groove bottom, and a wire passing port is provided on the groove bottom. A relay socket 111 is fixed on the inner surface of the upper cover 102. The relay socket 111 is connected to the said line collection connector through a wire. The relay socket 111 is provided with a jack corresponding to the pin 203. The relay socket 111 is located below the groove bottom of the embedding groove 110 and is observed outside the wire passing port. The jacks are all visible. The embedding block 201 is embedded in the embedding groove 110, and the pin 203 is plugged in one by one with the jack of the relay socket 111. The pin 203 and the jack form a slight interference fit, so that the quick-plug wiring harness 2 is electrically connected to the relay socket 111. Screws are connected between the embedding block 201 and the groove bottom of the embedding groove 110. Different from the first embodiment, the shells 101 of the three battery modules 1 in the present embodiment are integrally formed, and a connecting piece 107 integrally formed with the shells 101 is provided between the three shells 101. The connecting piece 107 is located on both sides of the shell 101, and the two ends of the connecting piece 107 are respectively connected to the two shells 101, and are generated synchronously during the injection molding of the three shells 101. The connecting piece 107 is in the shape of a strip and there are four connecting pieces 107 on each side of the shell 101. A handle 108 is provided on the upper cover 102, and the handle 108 is made of plastic. Correspondingly, a handle hidden groove 109 is also provided on the upper cover 102 for accommodating the handle 108 to be hidden. The rest is the same as the first embodiment.

[0040] When the sodium ion storage battery of the present invention is installed on an electric vehicle, three battery modules 1 are normally combined into a unit and are sent into the battery compartment of the electric vehicle one by one. During this process, the quick-plug harness 2 is not installed temporarily. After the battery module 1 is installed, the gap is filled and the battery module is positioned and reinforced, and then the quick-plug harness 2 can be installed. During installation, the insert block 201 of the quick-plug harness 2 is first aligned with the corresponding insert groove 110 and pressed down. With the help of the radial and circumferential positioning of the insert block 201 by the insert groove 110, the pin 203 of the quick-plug harness 2 and the socket of the relay socket 111 are quickly and accurately connected. Finally, screws are installed on the insert block 201 to further reinforce the connection between the quick-plug harness 2 and the relay socket 111.

[0041] Embodiment 5: There are seven cells 103 in the large battery module 1 and six cells 103 in the small battery module 1. The dimensions of the large and small battery modules 1 are 180 mm×122 mm×170 mm and 180 mm×105 mm×170 mm respectively. The rest is the same as in Example 1.

Claims

1. A modular structure of a sodium ion battery, characterized in that: The invention comprises a plurality of battery modules (1), wherein the battery modules (1) are connected and assembled via a quick-plug wiring harness (2), wherein the battery module (1) comprises a housing (101) and an upper cover (102) mounted on the top of the housing (101) and having an embedding groove (110), wherein battery cells (103) connected in series are arranged in the housing (101), and the quick-plug wiring harness (2) comprises a pair of embedded blocks (201) and a wire, wherein pins (203) are fixed on the embedded blocks (201), wherein the pins (203) of the two embedded blocks are connected in a one-to-one correspondence via the wire, wherein the embedded blocks (201) are adapted to be embedded in the embedding groove (110), and wherein the pins (203) are electrically connected to the battery cells (103).

2. The modular structure of sodium ion battery according to claim 1 is characterized in that: The quick-plug wiring harness (2) further comprises a wiring tube (202), the insert blocks (201) are fixed at both ends of the wiring tube (202), the wires are passed through the wiring tube (202), a relay socket (111) is provided below the bottom of the insert groove (110), and the plug pin (203) is electrically connected to the relay socket (111).

3. The modular structure of sodium ion battery according to claim 2 is characterized in that: A screw is connected between the embedding block (201) and the bottom of the embedding groove (110).

4. The modular structure of sodium ion battery according to claim 1 is characterized in that: A clamping block (105) is provided on the housing (101), and a buckle (106) clamped to the clamping block (105) is provided on the upper cover (102).

5. The modular structure of sodium ion battery according to claim 1 is characterized in that: A buckle (106) is provided on the housing (101), and a clamping block (105) clamped with the buckle (106) is provided on the upper cover (102).

6. The modular structure of sodium ion battery according to claim 1 is characterized in that: The multiple shells (101) are connected as one body via a connecting plate (107); two ends of the connecting plate (107) are respectively fixed on the shells (101) of the connected battery modules (1); the shells (101) and the connecting plate (107) are integrally formed.

7. The modular structure of sodium ion battery according to claim 6 is characterized in that: The connecting pieces (107) are in strip shape and are in multiple numbers.

8. The modular structure of sodium ion battery according to claim 1 is characterized in that: A handle (108) is provided on the upper cover (102).

9. The modular structure of sodium ion battery according to any one of claims 1 to 8, characterized in that: There are two battery modules (1), and the two battery modules (1) form a combined unit. One of the battery modules (1) contains 3 to 6 battery cells, and the other battery module (1) contains 7 to 10 battery cells.

10. The modular structure of sodium ion battery according to claim 9, characterized in that: The sodium ion storage battery is installed in a battery compartment of an electric vehicle, and the battery compartment accommodates two of the combined units. When installed in the battery compartment, the two combined units are arranged vertically, and the smaller battery module (1) is close to the vertical intersection.

Images