Protection structure of sodium ion battery

Abstract

The protection structure comprises a battery module, a battery rack and an insulating layer structure, the battery module comprises a plurality of battery cell groups, the battery rack is connected with the front end and the rear end of the battery module in a sleeved mode, the insulating layer structure is arranged on the outer side of the battery rack, the battery rack is composed of a plurality of connecting units, and each connecting unit is of an annular structure with the hollow middle. The inner walls of the connecting units abut against the outer walls of the battery cells, the outer walls, close to the edge of the battery rack, of the connecting units are each provided with one or two connecting surfaces, and the connecting surfaces on the same side are located on the same plane; bumps are also arranged on one side, far away from the battery cell, of the connecting unit, and are symmetrically arranged by taking the battery cell as a center; the outer walls of the connecting units far away from the edge of the battery rack are connected with the outer walls of the adjacent connecting units, the plurality of connecting units are of an integrally formed structure, openings are formed in the centers of the four adjacent connecting units, and gaps are formed between the adjacent battery cells by the battery rack; and the filling layer is arranged, so that a part of pressure is buffered, and meanwhile, internal components of the battery are stabilized.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, and more specifically to a protection structure of a sodium ion battery. Background Art

[0002] In recent years, with the development of smart grids, the degree of grid automation has been continuously improved. Many grid automation equipment has telemetry, telesignaling, and remote control functions. Most of these equipment are equipped with backup power supplies to ensure rapid fault handling during power outages. Taking the distribution network automation station terminal as an example, its main power supply is generally taken from the voltage transformer. When the main power supply is cut off, the backup power supply needs to meet the normal operation of the distribution network automation station terminal and the communication device for a period of time, and ensure that the switch is reliably opened and closed several times, and ensure that the fault information is reliably uploaded to the main station for fault judgment. At the same time, the fault is isolated to the smallest range before restoring regional power supply to shorten the power outage time.

[0003] The backup power supply of the terminal of the domestic distribution network automation station mainly adopts lead-acid battery or lithium-ion battery, especially sodium-ion battery. According to the records of the above background technology, there are frequent reports of fires in the domestic DTU lithium-ion battery backup power supply. The reason is that the sodium-ion battery is caused by the excessively high body temperature during operation. Therefore, how to avoid the short life of the battery due to the easy accumulation of heat in a high temperature environment and the easy occurrence of thermal runaway and fire, and then ensure the safety of battery use, is a technical problem that technical personnel in this field need to solve at present.

[0004] The utility model patent with the announcement number CN 220086168 U discloses a sodium ion battery, comprising a shell and a top cover mounted on the shell, the inner cavity of the shell is filled with a graphene heat-conducting filling layer, each embedded groove is plugged with a sodium ion battery, adjacent sodium ion batteries are connected in series in pairs through connecting sheets, and a plurality of sodium ion batteries are connected in series through the connecting sheets to form a sodium ion battery pack; heat-conducting components are detachably installed on the opposite side walls of the shell, and in the scheme, under the heat-conducting effect of the graphene heat-conducting filling layer, the heat generated by the sodium ion battery pack during operation can be timely diverted, so that each sodium ion battery can work at a reasonable temperature, and under the heat-conducting effect of the two groups of heat-conducting components, the heat in the graphene heat-conducting filling layer can be dissipated to the outside, thereby improving the safety of the sodium ion battery pack in the shell and avoiding fire caused by overheating.

[0005] However, the adjacent sodium-ion batteries in the above technical solution are connected in series through connecting plates, and their operating voltage is relatively small, which cannot meet the needs of fast charging and discharging. In addition to good thermal conductivity, graphene also has excellent electrical conductivity. Filling the entire battery cavity with a graphene thermal conductive filling layer has the risk of leakage and short circuit. Utility Model Content

[0006] In order to solve the above problems, the utility model proposes a protective structure of a sodium ion battery, including a battery module 10, a battery rack 2 and an insulating layer structure 4, wherein the battery module 10, the battery rack 2 and the insulating layer structure 4 are all arranged inside the battery shell, the battery module 10 includes a plurality of battery core groups 11, the battery rack 2 is sleeved with the front and rear ends of the battery module 10, the insulating layer structure 4 is arranged on the outside of the battery rack 2, the battery rack 2 is composed of a plurality of connecting units 22, the connecting unit 22 is a ring structure with a hollow middle portion, the inner wall of the connecting unit 22 is in contact with the outer wall of the battery core, and the connecting unit 22 in contact with the insulating layer structure 4 is The outer wall is provided with one or two connecting surfaces 222, and the connecting surfaces 222 are planes. The connecting surfaces 222 on the same side are located on the same plane, which is convenient for connection with the insulating layer structure 4; the outer walls of the connecting units 22 away from the edge of the battery rack 2 are connected to the outer walls of the adjacent connecting units 22, and the several connecting units 22 are an integrally formed structure. The centers of the four adjacent connecting units 22 are provided with openings 24 for heat dissipation. The battery rack 2 separates gaps between adjacent battery cells for heat dissipation, and contact short circuits are not likely to occur between the battery cells; by providing a filling layer 9, part of the pressure is buffered while stabilizing the internal components of the battery.

[0007] A protective structure for a sodium ion battery comprises a battery module 10, a battery rack 2 and an insulating layer structure 4, wherein the battery module 10, the battery rack 2 and the insulating layer structure 4 are all arranged inside a battery shell, the battery module 10 comprises a plurality of battery cell groups 11, the battery rack 2 is sleeved with the front and rear ends of the battery module 10, the insulating layer structure 4 is arranged outside the battery rack 2, the battery rack 2 is composed of a plurality of connection units 22, the connection unit 22 is a ring structure with a hollow middle portion, the inner wall of the connection unit 22 abuts against the outer wall of the battery cell, the outer wall of the connection unit 22 in contact with the insulating layer structure 4 is provided with one or two connection surfaces 222, the connection surface 222 is a plane, and the connection surfaces 222 on the same side are located on the same plane, so as to facilitate connection with the insulating layer structure 4; the outer walls of the connection units 22 away from the edge of the battery rack 2 are connected to the outer walls of the adjacent connection units 22, and the plurality of connection units 22 are an integrally formed structure.

[0008] Furthermore, the connecting unit 22 is provided with a protrusion 23 at the electrode end away from the battery cell it is sleeved with. The protrusion 23 is symmetrically arranged with the battery cell as the center. The protrusion 23 protrudes inside the annular structure, so that the battery cell is clamped in the protrusion 23 and the connecting unit 22 and is not easy to slip out.

[0009] Furthermore, openings 24 are provided at the centers of the four adjacent connection units 22 to facilitate heat dissipation. The battery rack 2 allows gaps to be separated between adjacent battery cells to facilitate heat dissipation, and contact short circuits are less likely to occur between the battery cells.

[0010] Furthermore, the battery rack 2 includes an upper battery rack 31 and a lower battery rack 32, the upper battery rack 31 is clamped with one electrode end of the battery cell, and the lower battery rack 32 is clamped with the other electrode end of the battery cell, and the battery module 10 is sleeved with the battery rack 2, so that the battery module 10 is placed as a whole in the battery rack 2.

[0011] Furthermore, the insulating layer structure 4 includes a plurality of first insulating plates 44, the inner walls of the first insulating plates 44 are fitted and connected to the connecting surface 222 or the protrusion 23, and the plurality of first insulating plates 44 surround the battery module 10 and the battery rack 2 for insulation.

[0012] Furthermore, the battery rack 2 is made of ABS+PC, and the outer surface of the battery cell is provided with a PVC film for insulation.

[0013] Furthermore, each battery module 10 is provided with multiple nickel strips 6 on the front and back surfaces, and the nickel strip 6 is composed of two sub-nickel strips, and the sub-nickel strip is composed of multiple nickel sheets, each nickel sheet corresponds to the positive electrode or negative electrode of a battery cell, and the adjacent nickel sheets of the same sub-nickel strip are connected by a nickel connector 61, and the one-to-one corresponding nickel sheets of the two sub-nickel strips of the same nickel strip 6 are connected by the nickel connector 61. At the same time, the nickel strips 6 connected to the positive and negative electrodes of the same group of battery cells 11 are staggered.

[0014] Furthermore, the nickel strip 6 is used to conduct current from the battery cell group 11, and the positive or negative electrodes of the battery cells of the same nickel strip 6 are connected in parallel through the corresponding sub-nickel strips, so that the capacity of the battery cell group 11 connected to the same nickel strip 6 is the sum of the capacities of all battery cell groups 11 on the nickel strip 6, and the positive electrode of one battery cell group 11 is connected in series with the negative electrode of another battery cell group 11 through the same nickel strip 6. At the same time, since the current of each battery cell flows from the negative electrode to the positive electrode, the current flows from the total negative electrode to the total positive electrode of the battery module 10 in an S-shaped process, so that the total voltage of the two battery modules 10 is the sum of the voltages of the battery cell groups 11 connected to each nickel strip 6.

[0015] Furthermore, the protection structure also includes a protection plate 7, a second insulating plate 8 and a filling layer 9. The protection plate 7 is arranged outside the first insulating plate 44 and is used to connect to the external plug with a wire for charging and discharging. The second insulating plate 8 is arranged above the protection plate 7 to insulate the protection plate 7.

[0016] Furthermore, the filling layer 9 is arranged between the battery casing and the second insulating plate 8, and between the second insulating plate 8 and the first insulating plate 44, so that the gaps between the battery casing and the second insulating plate 8, and between the second insulating plate 8 and the first insulating plate 44 are filled. When the battery is inverted or placed on its side, the remaining components in the battery casing are firmly positioned and do not collide with the battery casing, and at the same time play a buffering role.

[0017] In some embodiments, the filling layer 9 is made of EVA foam with a density of 30 g / cm3.

[0018] Beneficial effects of the utility model: A protective structure of a sodium ion battery, comprising a battery module 10, a battery rack 2 and an insulating layer structure 4, wherein the battery module 10, the battery rack 2 and the insulating layer structure 4 are all arranged inside a battery shell, the battery module 10 comprises a plurality of battery core groups 11, the battery rack 2 is sleeved with the front and rear ends of the battery module 10, the insulating layer structure 4 is arranged outside the battery rack 2, the battery rack 2 is composed of a plurality of connecting units 22, the connecting unit 22 is a hollow ring structure in the middle, the inner wall of the connecting unit 22 is in contact with the outer wall of the battery core, and the outer wall of the connecting unit 22 near the edge of the battery rack 2 is provided with one or two connecting surfaces 222, and the connecting surface 222 is flat The connecting surface 222 on the same side is located on the same plane, which is convenient for connection with the insulating layer structure 4; a protrusion 23 is also provided on the side of the connecting unit 22 away from the battery cell, and the protrusion 23 is symmetrically arranged with the battery cell as the center, and the protrusion 23 protrudes to the inside of the annular structure, so that the battery cell is clamped in the protrusion 23 and the connecting unit 22 and is not easy to slide out; the outer walls of the connecting units 22 away from the edge of the battery rack 2 are connected to the outer walls of the adjacent connecting units 22, and the several connecting units 22 are an integrally formed structure, and the centers of the four adjacent connecting units 22 are provided with openings 24 for heat dissipation. The battery rack 2 separates gaps between adjacent battery cells for heat dissipation, and contact short circuits are not easy to occur between the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a battery module structure diagram of the protection structure of the sodium ion battery of the utility model.

[0020] Figure 2 This is a battery module connection structure diagram of the sodium ion battery protection structure of the utility model.

[0021] Figure 3 A schematic side view of the battery module connection of the protection structure of the sodium ion battery of the utility model.

[0022] Figure 4 The present invention is a three-dimensional structural diagram of a battery rack of a sodium ion battery protection structure.

[0023] Figure 5 The utility model is a plan view of the connection state of the battery rack and the battery module of the protection structure of the sodium ion battery.

[0024] Figure 6 The utility model is a schematic diagram of the overall structure of the protection structure of the sodium ion battery.

[0025] Main component symbols

[0026] Battery Module 10 Battery pack 11 Battery rack 2 Connection unit 22 Connection surface 222 Bump 23 Opening 24 Upper battery rack 31 Lower battery rack 32 Insulation layer structure 4 First insulating plate 44 Nickel Strip 6 Nickel connectors 61 Protection board 7 Second insulating plate 8 Filling layer 9

[0027] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, it is a battery module structure diagram of the protection structure of the sodium ion battery of the utility model; Figure 2 As shown, it is a battery module connection structure diagram of the protection structure of the sodium ion battery of the utility model; Figure 3 As shown, it is a schematic diagram of the battery module connection side of the protection structure of the sodium ion battery of the utility model; Figure 4 As shown, it is a three-dimensional structural diagram of the battery rack of the sodium ion battery protection structure of the utility model; Figure 5 As shown, it is a plan view of the connection state of the battery rack and the battery module of the protection structure of the sodium ion battery of the utility model; Figure 6 As shown, it is a schematic diagram of the overall structure of the protection structure of the sodium ion battery of the utility model.

[0029] Embodiment 1:

[0030] A protective structure for a sodium ion battery comprises a battery module 10, a battery rack 2 and an insulating layer structure 4, wherein the battery module 10, the battery rack 2 and the insulating layer structure 4 are all arranged inside a battery shell, the battery module 10 comprises a plurality of battery cell groups 11, the battery rack 2 is sleeved with the front and rear ends of the battery module 10, the insulating layer structure 4 is arranged outside the battery rack 2, the battery rack 2 is composed of a plurality of connection units 22, the connection unit 22 is a ring structure with a hollow middle portion, the inner wall of the connection unit 22 abuts against the outer wall of the battery cell, the outer wall of the connection unit 22 in contact with the insulating layer structure 4 is provided with one or two connection surfaces 222, the connection surface 222 is a plane, and the connection surfaces 222 on the same side are located on the same plane, so as to facilitate connection with the insulating layer structure 4; the outer walls of the connection units 22 away from the edge of the battery rack 2 are connected to the outer walls of the adjacent connection units 22, and the plurality of connection units 22 are an integrally formed structure.

[0031] The connecting unit 22 is further provided with a protrusion 23 at the electrode end away from the battery cell it is sleeved with. The protrusion 23 is symmetrically arranged with the battery cell as the center. The protrusion 23 protrudes inside the annular structure, so that the battery cell is clamped in the protrusion 23 and the connecting unit 22 and is not easy to slide out.

[0032] The centers of the four adjacent connection units 22 are provided with openings 24 for heat dissipation. The battery rack 2 allows gaps to be separated between adjacent battery cells for heat dissipation, and contact short circuits are less likely to occur between the battery cells.

[0033] The battery rack 2 includes an upper battery rack 31 and a lower battery rack 32 . The upper battery rack 31 is clamped with one electrode end of the battery cell, and the lower battery rack 32 is clamped with the other electrode end of the battery cell. The battery module 10 is sleeved with the battery rack 2 , so that the battery module 10 is placed in the battery rack 2 as a whole.

[0034] The insulating layer structure 4 includes a plurality of first insulating plates 44 , the inner walls of the first insulating plates 44 are fitted and connected to the connecting surface 222 or the protrusion 23 , and the plurality of first insulating plates 44 surround the battery module 10 and the battery rack 2 for insulation.

[0035] The battery rack 2 is made of ABS+PC, and the outer surface of the battery cell is provided with a PVC film for insulation.

[0036] A plurality of nickel strips 6 are provided on the front and rear surfaces of each battery module 10, wherein the nickel strip 6 is composed of two sub-nickel strips, each of which is composed of a plurality of nickel sheets, each of which corresponds to the positive electrode or the negative electrode of a battery cell, and the adjacent nickel sheets of the same sub-nickel strip are connected by a nickel connector 61, and the one-to-one corresponding nickel sheets of the two sub-nickel strips of the same nickel strip 6 are connected by a nickel connector 61. At the same time, the nickel strips 6 connected to the positive and negative electrodes of the same group of battery cells 11 are arranged alternately.

[0037] The nickel strip 6 is used to conduct current from the battery cell group 11. The positive or negative electrodes of the battery cells of the same nickel strip 6 are connected in parallel through corresponding sub-nickel strips, so that the capacity of the battery cell group 11 connected to the same nickel strip 6 is the sum of the capacities of all battery cell groups 11 on the nickel strip 6. The positive electrode of one battery cell group 11 is connected in series with the negative electrode of another battery cell group 11 through the same nickel strip 6. At the same time, since the current of each battery cell flows from the negative electrode to the positive electrode, the current flows from the total negative electrode to the total positive electrode of the battery module 10 in an S-shaped process, so that the total voltage of the two battery modules 10 is the sum of the voltages of the battery cell groups 11 connected to each nickel strip 6.

[0038] The protection structure also includes a protection plate 7, a second insulating plate 8 and a filling layer 9. The protection plate 7 is arranged outside the first insulating plate 44 and is used to connect to an external plug with a wire for charging and discharging. The second insulating plate 8 is arranged above the protection plate 7 to insulate the protection plate 7.

[0039] The filling layer 9 is arranged between the battery casing and the second insulating plate 8, and between the second insulating plate 8 and the first insulating plate 44, so that the gaps between the battery casing and the second insulating plate 8, and between the second insulating plate 8 and the first insulating plate 44 are filled. When the battery is inverted or placed on its side, the remaining components in the battery casing are firmly positioned and do not collide with the battery casing. At the same time, it plays a buffering role. The filling layer 9 is made of EVA foam with a density of 30g / cm3.

[0040] Beneficial effects of the utility model: A protective structure of a sodium ion battery, comprising a battery module 10, a battery rack 2 and an insulating layer structure 4, wherein the battery module 10, the battery rack 2 and the insulating layer structure 4 are all arranged inside a battery shell, the battery module 10 comprises a plurality of battery core groups 11, the battery rack 2 is sleeved with the front and rear ends of the battery module 10, the insulating layer structure 4 is arranged outside the battery rack 2, the battery rack 2 is composed of a plurality of connecting units 22, the connecting unit 22 is a hollow ring structure in the middle, the inner wall of the connecting unit 22 is in contact with the outer wall of the battery core, and the outer wall of the connecting unit 22 near the edge of the battery rack 2 is provided with one or two connecting surfaces 222, and the connecting surface 222 is flat The connecting surface 222 on the same side is located on the same plane, which is convenient for connection with the insulating layer structure 4; a protrusion 23 is also provided on the side of the connecting unit 22 away from the battery cell, and the protrusion 23 is symmetrically arranged with the battery cell as the center, and the protrusion 23 protrudes to the inside of the annular structure, so that the battery cell is clamped in the protrusion 23 and the connecting unit 22 and is not easy to slide out; the outer walls of the connecting units 22 away from the edge of the battery rack 2 are connected to the outer walls of the adjacent connecting units 22, and the several connecting units 22 are an integrally formed structure, and the centers of the four adjacent connecting units 22 are provided with openings 24 for heat dissipation. The battery rack 2 separates gaps between adjacent battery cells for heat dissipation, and contact short circuits are not easy to occur between the battery cells.

[0041] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A protective structure for a sodium ion battery, characterized in that: The invention comprises a battery module (10), a battery frame (2) and an insulating layer structure (4), wherein the battery module (10), the battery frame (2) and the insulating layer structure (4) are all arranged inside a battery housing, the battery module (10) comprises a plurality of battery cell groups (11), the battery frame (2) is sleeved with the front and rear ends of the battery module (10), the insulating layer structure (4) is arranged outside the battery frame (2), and the battery frame (2) is composed of a plurality of connecting units (22), wherein the connecting unit (22) is a ring with a hollow middle portion. The invention relates to a battery-shaped structure, wherein the inner wall of the connection unit (22) abuts against the outer wall of the battery cell, and the outer wall of the connection unit (22) in contact with the insulating layer structure (4) is provided with one or two connection surfaces (222), wherein the connection surface (222) is a plane, and the connection surfaces (222) on the same side are located on the same plane, so as to facilitate connection with the insulating layer structure (4); the outer wall of the connection unit (22) away from the edge of the battery frame (2) is connected to the outer wall of the adjacent connection unit (22), and the plurality of connection units (22) are an integrally formed structure.

2. The protective structure of a sodium ion battery according to claim 1, characterized in that: The connection unit (22) is further provided with a protrusion (23) at the electrode end away from the battery cell to which it is sleeved. The protrusion (23) is symmetrically arranged with the battery cell as the center, and the protrusion (23) protrudes toward the inside of the annular structure.

3. The protective structure of a sodium ion battery according to claim 1, characterized in that: An opening (24) is provided at the center of four adjacent connection units (22), and the battery rack (2) allows gaps to be separated between adjacent battery cells.

4. The protective structure of a sodium ion battery according to claim 1, characterized in that: The battery rack (2) comprises an upper battery rack (31) and a lower battery rack (32); the upper battery rack (31) is clamped with one electrode end of the battery cell, and the lower battery rack (32) is clamped with the other electrode end of the battery cell; the battery module (10) is sleeved with the battery rack (2), so that the battery module (10) is placed as a whole in the battery rack (2).

5. The protective structure of a sodium ion battery according to claim 2, characterized in that: The insulating layer structure (4) comprises a plurality of first insulating plates (44), the inner walls of the first insulating plates (44) being fitted and connected to the connecting surface (222) or the protrusion (23), and the plurality of first insulating plates (44) surround the battery module (10) and the battery rack (2).

6. The protective structure of a sodium ion battery according to claim 1, characterized in that: A plurality of nickel strips (6) are provided on both the front and rear surfaces of each battery module (10), wherein the nickel strip (6) is composed of two sub-nickel strips, and the sub-nickel strip is composed of a plurality of nickel sheets, each of which corresponds to the positive electrode or the negative electrode of a battery cell, and the adjacent nickel sheets of the same sub-nickel strip are connected by a nickel connector (61), and the one-to-one corresponding nickel sheets of the two sub-nickel strips of the same nickel strip (6) are connected by a nickel connector (61), and at the same time, the nickel strips (6) connected to the positive and negative electrodes of the same battery cell group (11) are arranged in an alternating manner.

7. The protective structure of a sodium ion battery according to claim 6, characterized in that: The positive electrodes or negative electrodes of the cells of the same nickel strip (6) are connected in parallel via corresponding sub-nickel strips, so that the capacity of the cell group (11) connected to the same nickel strip (6) is the sum of the capacities of all the cell groups (11) on the nickel strip (6), and the positive electrode of one cell group (11) is connected in series with the negative electrode of another cell group (11) via the same nickel strip (6). At the same time, since the current of each cell flows from the negative electrode to the positive electrode, the current flows from the total negative electrode to the total positive electrode of the battery module (10) in an S-shaped manner, so that the total voltage of the two battery modules (10) is the sum of the voltages of the cell groups (11) connected to each nickel strip (6).

8. The protective structure of a sodium ion battery according to claim 5, characterized in that: The protection structure further comprises a protection plate (7), a second insulating plate (8) and a filling layer (9); the protection plate (7) is arranged outside the first insulating plate (44) and is used to connect with a wire to an external plug for charging and discharging; the second insulating plate (8) is arranged above the protection plate (7).

9. The protective structure of a sodium ion battery according to claim 8, characterized in that: The filling layer (9) is arranged between the battery casing and the second insulating plate (8), and between the second insulating plate (8) and the first insulating plate (44), so that the gaps between the battery casing and the second insulating plate (8), and between the second insulating plate (8) and the first insulating plate (44) are filled.

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