High-capacity battery

Abstract

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery. The problem that an existing high-capacity battery cannot exhaust a large amount of thermal runaway smoke in time in a short time is solved. At least two explosion venting parts are arranged on one explosion venting channel, or at least two explosion venting channels are arranged on the same large-capacity battery, and when any single battery is subjected to thermal runaway, thermal runaway flue gas is simultaneously discharged from a plurality of explosion venting parts of the same explosion venting channel, or is simultaneously discharged from the explosion venting parts of different explosion venting channels. Heat and thermal runaway smoke gathered in an explosion venting channel and a single battery can be reduced in a short time, and the explosion risk is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, in particular to a large-capacity battery. Background Art

[0002] Currently, many single cells are connected in parallel or in series on the market to form large-capacity batteries (also called battery modules or battery packs).

[0003] However, the individual cells in existing large-capacity batteries are different from each other. Due to the existence of the barrel effect, they are often affected by the cell with the worst performance, which greatly limits the capacity limit and cycle times of the entire large-capacity battery. Therefore, how to improve the uniformity of each cell in a large-capacity battery has become the focus and difficulty of research in this field.

[0004] In order to solve the above problems, Figure 1 As shown, Chinese patent CN117477159A discloses a battery pack, including a plurality of single cells 1, the inner cavities of each single cell 1 are connected through an electrolyte sharing channel 01, and a plugging piece 02 is provided at one end of the electrolyte sharing channel 01 to close the electrolyte sharing channel 01, and a port for detachably connecting other components is provided at the other end to install an injection component, after the injection component is installed, the electrolyte is injected into the electrolyte sharing channel 01 through the injection component, and the electrolyte will enter the inner cavity of the single cell in turn, further making all the single cells in the battery pack under a uniform electrolyte environment, effectively improving the uniformity of the electrolyte in the battery pack, and replacing the explosion relief valve 03 after the injection is completed. When any single cell has thermal runaway, the thermal runaway smoke enters the electrolyte sharing channel 01 and is discharged through the explosion relief valve 03.

[0005] For the above-mentioned battery pack, when a single cell experiences thermal runaway, the thermal runaway smoke inside it needs to squeeze out part of the electrolyte inside the single cell and the electrolyte sharing channel 01 before it can be discharged. Because the bottom of each single cell is connected to the electrolyte sharing channel 01, while the electrolyte in the electrolyte sharing channel 01 is discharged, the electrolyte in the remaining single cells will flow into the electrolyte sharing channel 01 due to gravity. Therefore, the thermal runaway smoke may also need to squeeze out the electrolyte in the remaining single cells before it can be discharged.

[0006] From the above, it can be seen that when thermal runaway occurs in this type of battery pack, the pressure holding time is relatively long, and there are certain safety hazards.

[0007] In order to overcome the above problems, Figure 2As shown, Chinese patent CN219873921U discloses a large-capacity battery, including a hollow component 04 and a plurality of single cells 1 connected in parallel; the inner cavity of each single cell 1 includes an electrolyte area and a gas area; the hollow component 04 extends along the arrangement direction of the plurality of single cells 1, is fixed on the top of the shell of each single cell 1, and is connected with the inner cavity of each single cell 1, and the gas area of ​​each single cell 1 is connected with the above-mentioned hollow component 04. An exhaust valve and an explosion relief membrane are respectively arranged at both ends of the hollow component 04. When any single cell has thermal runaway, since the hollow component 04 is connected with the gas area of ​​each single cell, the thermal runaway smoke can directly enter the hollow component 04 without overcoming the electrolyte pressure, break through the explosion relief membrane and be discharged, and the pressure holding time is short, which has high safety.

[0008] However, the above patents all use an explosion relief part (explosion relief valve or explosion relief membrane) of an explosion relief channel (electrolyte shared channel in Chinese patent CN117477159A, hollow component in Chinese patent CN219873921U) for explosion relief. When multiple single cells in such large-capacity batteries experience thermal runaway at the same time, a large amount of thermal runaway smoke will be generated in a short period of time. A large amount of thermal runaway smoke may not be discharged in time through an explosion relief part of an explosion relief channel, and the generated heat cannot be discharged either, posing a risk of explosion. Utility Model Content

[0009] The utility model aims to provide a large-capacity battery, which overcomes the problem that the existing large-capacity battery cannot discharge a large amount of thermal runaway smoke in a short time.

[0010] The first aspect of the utility model provides a large-capacity battery, which is special in that it includes a plurality of single cells arranged in the same direction and an explosion relief channel;

[0011] The explosion venting channel has at least two explosion venting parts. When any single battery undergoes thermal runaway, the thermal runaway smoke is discharged from the explosion venting part through the explosion venting channel.

[0012] The utility model provides at least two explosion-relief parts on an explosion-relief channel. When any single cell battery has thermal runaway, the thermal runaway smoke is discharged from multiple explosion-relief parts of the explosion-relief channel (it can be understood that the multiple explosion-relief parts are located at different parts of the explosion-relief channel) at the same time. In a short time, the heat accumulated in the explosion-relief channel and the single cell battery and the thermal runaway smoke can be reduced, thereby reducing the risk of explosion.

[0013] Furthermore, there are two explosion relief parts, which are respectively located at two ends of the explosion relief channel.

[0014] Furthermore, the explosion-proof channel is connected with the inner cavity of each single battery. During the normal charge and discharge cycle of the large-capacity battery, such an explosion-proof channel can also place each single battery in a unified environment, reduce the differences between each single battery, and improve the performance and charge and discharge cycle life of the large-capacity battery.

[0015] The second aspect of the utility model also provides another large-capacity battery, which is special in that it includes a plurality of single cells arranged in the same direction and at least two explosion-discharging channels;

[0016] Each explosion relief channel has at least one explosion relief part. When any single battery undergoes thermal runaway, the thermal runaway smoke is discharged from the explosion relief part through at least two explosion relief channels.

[0017] The large-capacity battery of the utility model comprises at least two explosion-relief channels, and at least one explosion-relief part is provided on each explosion-relief channel. When thermal runaway occurs in any single cell, the thermal runaway smoke is discharged from the explosion-relief parts of different explosion-relief channels at the same time, and the heat and thermal runaway smoke accumulated in the explosion-relief channels and the single cells as well as the thermal runaway smoke can be reduced in a short time, thereby reducing the risk of explosion.

[0018] Furthermore, there are two explosion-relief channels, and each explosion-relief channel has an explosion-relief portion located at one end of the explosion-relief channel.

[0019] Furthermore, one of the explosion-venting channels is located at the bottom of each single cell and is connected to the inner cavity of each single cell; during the normal charge and discharge cycle of the large-capacity battery, such explosion-venting channels can also connect the electrolytes of each single cell, reduce the differences between the electrolytes of each single cell, and improve the performance and charge and discharge cycle life of the large-capacity battery. Another explosion-venting channel is located at the top of each single cell, covering the explosion-venting port of each single cell. The explosion-venting port here may or may not have an explosion-venting membrane. When there is no explosion-venting membrane, the inner cavity of the explosion-venting channel is connected to the gas area of ​​each single cell, so that each single cell reaches gas balance, reduces the differences between the electrolytes of each single cell, and improves the performance and charge and discharge cycle life of the large-capacity battery.

[0020] Furthermore, a hollow tube can be fixedly connected to each single battery housing, the inner cavity of the hollow tube is used as the explosion relief channel, and the explosion relief part is fixed to the hollow tube.

[0021] Furthermore, multiple single cells may be arranged in the same direction in the housing, and the channel formed between the inner wall of the housing and each single cell is used as an explosion relief channel, and the explosion relief portion corresponding to the explosion relief channel is fixed to the housing.

[0022] Furthermore, in order to improve the heat dissipation performance of such large-capacity batteries, avoidance holes are provided on the top plate of the shell corresponding to the polarity terminals of each single battery; each single battery polarity terminal extends out of the avoidance hole, and the top plate area of ​​the shell corresponding to the avoidance hole is fixedly sealed with the single battery shell; a heat transfer pipe clamping portion is provided at the portion where each single battery polarity terminal extends out of the avoidance hole;

[0023] The heat transfer tube is fixed on the heat transfer tube clamping part of the polarity terminal of each single battery.

[0024] Furthermore, an insulating sealant layer is laid on the top plate of the shell; the electrical connection parts of the polarity terminals of each single battery extend out of the insulating sealant layer, and the liquid inlet and outlet ends of the heat transfer tube extend out of the insulating sealant layer.

[0025] The beneficial effects of the utility model are:

[0026] The utility model provides at least two explosion relief parts on one explosion relief channel, or provides at least two explosion relief channels on the same large-capacity battery. When any single battery has thermal runaway, the thermal runaway smoke is discharged from multiple explosion relief parts of the same explosion relief channel at the same time, or is discharged from the explosion relief parts of different explosion relief channels at the same time. In a short time, the heat accumulated in the explosion relief channel and the single battery and the thermal runaway smoke can be reduced, thereby reducing the risk of explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a large-capacity battery in the background technology;

[0028] Figure 2 It is a structural schematic diagram of another large-capacity battery in the background technology;

[0029] Figure 3 This is a schematic diagram of the structure of a large-capacity battery in Example 1;

[0030] Figure 4 This is a schematic diagram of the structure of a large-capacity battery in Example 2;

[0031] Figure 5 This is a schematic diagram of the structure of a large-capacity battery in Example 3;

[0032] Figure 6 This is a schematic diagram of the structure of a large-capacity battery in Example 4;

[0033] Figure 7 This is a schematic diagram of a partial explosion of a large-capacity battery in Example 4;

[0034] Figure 8 This is a schematic diagram of the structure of a large-capacity battery with an insulating protective cover in Example 4;

[0035] Fig. 9A schematic diagram of a partial explosion of a large-capacity battery with an insulating protective cover in Example 4;

[0036] Fig.10 This is a schematic diagram of the structure of a large-capacity battery in Example 5;

[0037] Fig.11 This is a schematic diagram of a partial explosion of a large-capacity battery in Example 5;

[0038] The accompanying drawings in the figure are as follows:

[0039] 01. Electrolyte shared channel; 02. Blocking piece; 03. Explosion relief valve; 04. Hollow component;

[0040] 1. Single cell; 11. Polarity terminal; 2. First hollow pipe; 3. Explosion vent; 4. Third hollow pipe; 5. Shell; 51. Shell bottom plate; 52. Shell top plate; 53. End plate; 6. Liquid channel; 7. Gas channel; 8. Heat transfer tube; 9. Insulation protective cover. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work should fall within the scope of protection of the utility model.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top, bottom" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] Existing large-capacity batteries include multiple single cells arranged in the same direction, and multiple single cells are vented through an explosion venting part (the explosion venting part here can be an explosion venting port or explosion-proof port with an explosion venting membrane, or an explosion venting valve, etc.) of the same explosion venting channel (electrolyte shared channel in Chinese patent CN117477159A, hollow component in Chinese patent CN219873921U). When multiple single cells have thermal runaway at the same time, an explosion venting part based on the same explosion venting channel cannot discharge a large amount of thermal runaway smoke in time, which poses certain safety issues.

[0045] Based on this, the utility model is optimized from the following two aspects to avoid the occurrence of the above problems:

[0046] First, increase the number of explosion relief parts on the explosion relief channel so that the thermal runaway smoke is discharged from different explosion relief parts of the explosion relief channel;

[0047] Secondly, increase the number of explosion relief channels so that the thermal runaway smoke can be discharged from multiple explosion relief channels. At the same time, each explosion relief channel can also include multiple explosion relief parts.

[0048] It should be noted that the explosion relief channel in the large-capacity battery of the utility model can be located at the bottom of each single cell and connected to the inner cavity of each single cell, thereby achieving the effect of electrolyte connection. During the normal charge and discharge cycle of the large-capacity battery, the explosion relief channel can also make each single cell in a unified electrolyte environment, thereby ensuring the uniformity of the electrolyte in each single cell and improving the performance and charge and discharge cycle life of the large-capacity battery.

[0049] The explosion-proof channel in the large-capacity battery of the utility model can also be located on the top of each single battery, covering the explosion-proof opening of each single battery (no explosion-proof membrane is provided in the explosion-proof opening here), and is connected with the inner cavity of each single battery through the explosion-proof opening to achieve a gas connection effect. During the normal charge and discharge cycle of the large-capacity battery, the gas balance of each single battery can be achieved through the explosion-proof channel, and the performance and charge and discharge cycle life of the large-capacity battery can also be improved.

[0050] The explosion venting channel in the large-capacity battery of the utility model can also be located on the top of each single battery, covering the explosion venting port of each single battery (an explosion venting membrane is provided in the explosion venting port here); when the pressure in the inner cavity of any single battery is too large, the thermal runaway smoke breaks through the explosion venting membrane on the explosion venting port of each single battery, enters the explosion venting channel, and is discharged from the explosion venting part.

[0051] The explosion relief channel in the large-capacity battery of the utility model can also be located on the side wall of each single battery, and the inner cavity of the explosion relief channel is connected to the electrolyte area and gas area of ​​the inner cavity of all single batteries. During the normal charge and discharge cycle of the large-capacity battery, each single battery can be placed in a unified electrolyte environment and gas environment through an explosion relief channel, thereby improving the performance and charge and discharge cycle life of the large-capacity battery.

[0052] For large-capacity batteries with different structures, the utility model can adopt explosion relief channels with different structures. The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0053] Example 1

[0054] like Figure 3 The figure shows a schematic diagram of the structure of the large-capacity battery of the present embodiment. It can be seen from the figure that the large-capacity battery of the present embodiment includes 9 single cells 1 arranged in the same direction, a first hollow tube 2 is fixed on the top of the 9 single cells 1, and the inner cavity of the first hollow tube 2 is used as an explosion-proof channel. The projection of the first hollow tube 2 on the top of each single cell 1 needs to cover the explosion-proof opening on the top of the corresponding single cell 1; explosion-proof parts 3 are provided at both ends of the first hollow tube 2.

[0055] In other embodiments, the number of single cells 1 can be adjusted according to actual needs; the number of explosion relief parts 3 can also be adjusted according to actual needs. For example, three explosion relief parts 3 can be provided on the first hollow tube 2, two of which are still fixed at both ends of the first hollow tube 2, and the other explosion relief part 3 can be fixed at the opening of the tube wall of the first hollow tube 2. It should be noted that the explosion relief part 3 and the first hollow tube 2 should be sealed.

[0056] It should be noted that:

[0057] 1. The single cell 1 described herein is a square shell battery, including an upper cover plate, a lower cover plate, a cylinder, a battery cell assembly and an electrolyte; the upper cover plate or the lower cover plate and the cylinder can be integrally formed;

[0058] In the present invention, the battery cell assembly described here can be referred to as an electrode assembly, which is composed of a positive electrode, a separator, and a negative electrode arranged in sequence and assembled by a lamination or winding process. The upper cover plate, the cylinder, and the lower cover plate constitute the shell of the single battery 1, and the battery cell assembly and the electrolyte are located in the shell of the single battery 1;

[0059] In the present utility model, the battery cell assembly described herein may also be a commercially available square shell battery with a through hole, and the through hole is connected to the explosion vent;

[0060] 2. The above-mentioned explosion vent is the explosion vent of the single battery 1 itself, and an explosion vent membrane is fixed in the explosion vent; the above-mentioned explosion vent may also not be provided with an explosion vent membrane, and the inner cavity of the first hollow tube 2 is connected with the inner cavity of the corresponding single battery 1 through the explosion vent;

[0061] 3. The explosion relief part 3 may be a pressure relief valve fixed at both ends of the first hollow pipe 2, or an explosion relief pipe with an explosion relief membrane fixed at both ends of the first hollow pipe 2; the explosion relief membrane may also be directly fixed to the two ends of the first hollow pipe 2 to seal the ports as the explosion relief part 3;

[0062] When any single cell 1 in the above-mentioned large-capacity battery undergoes thermal runaway, a large amount of thermal runaway smoke can be discharged from the explosion relief parts 3 at both ends through the inner cavity of the first hollow pipe 2 in a short time, reducing the accumulation of thermal runaway smoke in the explosion relief channel and the inner cavity of each single cell 1, and having higher safety.

[0063] In some other embodiments, a second hollow tube may be fixed at the bottom of each single cell 1, and the inner cavity of the second hollow tube is connected to the inner cavity of each single cell 1. Through the second hollow tube, each single cell 1 can be placed in a uniform electrolyte environment, thereby ensuring the uniformity of the electrolyte in each single cell 1 and improving the performance and charge and discharge cycle life of large-capacity batteries.

[0064] Example 2

[0065] like Figure 4 As shown, different from the embodiment 1, in this embodiment, a third hollow tube 4 is fixed at the bottom of the nine single cells 1, and the inner cavity of the third hollow tube 4 is connected with the inner cavity of each single cell 1. The inner cavity of the third hollow tube 4 is used as an explosion relief channel, and the explosion relief parts 3 are fixed at both ends of the third hollow tube 4.

[0066] When any single cell 1 in the above-mentioned large-capacity battery undergoes thermal runaway, the electrolyte and thermal runaway smoke can be discharged from different directions due to the increase in the number of explosion venting parts 3, thereby reducing the accumulation of thermal runaway smoke in the explosion venting channel and the inner cavity of each single cell 1, reducing the pressure holding time, and having higher safety.

[0067] During the normal charge and discharge cycle of the large-capacity battery, the third hollow tube 4 can also place each single cell 1 in a uniform electrolyte environment, ensuring the uniformity of the electrolyte in each single cell 1; and improving the performance and charge and discharge cycle life of the large-capacity battery.

[0068] In some other embodiments, a fourth hollow tube can be fixed on the top of each single cell 1, and the inner cavity of the fourth hollow tube is connected to the inner cavity of each single cell 1. Through the fourth hollow tube, each single cell 1 can achieve gas balance, thereby improving the performance and charge and discharge cycle life of large-capacity batteries.

[0069] Example 3

[0070] like Figure 5 The figure is a schematic diagram of the structure of the large-capacity battery of this embodiment. Different from the above-mentioned embodiment, this embodiment has a first hollow tube 2 fixed on the top of each single battery 1. The first hollow tube 2 can be connected to the inner cavity of each single battery, and can also cover the explosion vent of each single battery (the explosion vent is provided with an explosion vent film); a third hollow tube 4 is fixed on the bottom of each single battery 1. The inner cavity of the third hollow tube 4 is connected to the inner cavity of each single battery. The inner cavities of the first hollow tube 2 and the third hollow tube 4 are both used as explosion venting channels, and an explosion venting part 3 is fixed at either end of the first hollow tube 2 and the third hollow tube 4. The two explosion venting parts 3 can be located on the same side or on different sides. Figure 5 Take the case where two explosion relief parts are located on the same side.

[0071] In other embodiments, the explosion relief part 3 may also be fixed to both ends of the first hollow tube 2 and the third hollow tube 4 .

[0072] When any single cell 1 in the above-mentioned large-capacity battery undergoes thermal runaway, the electrolyte and thermal runaway smoke can be discharged from different explosion-proof channels due to the increase in the number of explosion-proof channels, thereby reducing the accumulation of thermal runaway smoke in the explosion-proof channels and the inner cavities of each single cell 1, reducing the pressure holding time, and having higher safety.

[0073] During the normal charge and discharge cycle of the large-capacity battery, the third hollow tube 4 can also make each single cell 1 in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell 1; improving the performance and charge and discharge cycle life of the large-capacity battery. When the inner cavity of the first hollow tube 2 is connected to the inner cavity of each single cell, the gas in each single cell can also reach equilibrium.

[0074] Example 4

[0075] like Figure 6 and Figure 7 , which is a schematic structural diagram of a large-capacity battery of this embodiment. The large-capacity battery of this embodiment comprises a housing 5 and a plurality of single cells 1 arranged in parallel in the housing 5 .

[0076] The single battery 1 in this embodiment is a square shell battery, and the number is 13. In other embodiments, the number can be adjusted according to actual needs. The inner cavity of each single battery 1 includes an electrolyte area and a gas area.

[0077] The inner cavity of the shell 5 is connected to the inner cavity of each single battery 1. The above connection effect can be achieved by providing a liquid channel 6 or a gas channel 7 in the shell 5 so that the inner cavity of the liquid channel 6 or the gas channel 7 is connected to the inner cavity of all single batteries 1.

[0078] In this embodiment, the liquid channel 6 or the gas channel 7 is used as an explosion relief channel, and the explosion relief part 3 is fixed on the area of ​​the housing 5 corresponding to the explosion relief channel. Figure 6 and Figure 7 The liquid channel is mainly used as an explosion relief channel as an example.

[0079] For the convenience of description, in this embodiment, the length direction of the shell 5 is defined as the x direction, the width direction of the shell 5 is defined as the y direction, and the height direction of the shell 5 is defined as the z direction.

[0080] like Figure 7 As shown, in this embodiment, a liquid channel 6 is provided on the bottom plate 51 of the housing along the x direction, and the inner cavity of the liquid channel 6 is connected to the inner cavity electrolyte area of ​​each single battery 1.

[0081] A gas channel 7 is provided on the housing top plate 52 along the x direction, and the inner cavity of the gas channel 7 is connected to the inner cavity gas area of ​​each single battery 1 .

[0082] In some other embodiments, only the liquid channel 6 or the gas channel 7 may be provided (when only the gas channel 7 is provided, the gas channel 7 serves as an explosion relief channel);

[0083] In this embodiment, through holes penetrating the liquid channel 6 are provided on the left and right side end plates 53 of the shell 5 (side plates parallel to the yz plane), and explosion-proof pipes are connected at the through holes. An explosion-proof membrane is fixed in the explosion-proof pipe, which serves as the explosion-proof part 3 of the large-capacity battery.

[0084] In some other embodiments, through holes penetrating the gas channel can be opened on the left and right side end plates 53 of the outer shell 5 (side plates parallel to the yz plane), and explosion-proof pipes are connected at the through holes. An explosion-proof membrane is fixed in the explosion-proof pipe to serve as the explosion-proof part 3 of the large-capacity battery.

[0085] In some other embodiments, an explosion-proof membrane may be directly fixed in the through hole of the end plate 53 of the housing 5 as the explosion-proof part 3 of the large-capacity battery.

[0086] When any single cell 1 in the above-mentioned large-capacity battery undergoes thermal runaway, since explosion venting parts 3 are provided at both ends of the explosion venting channel, the electrolyte and thermal runaway smoke can be discharged from both ends of the liquid channel, thereby reducing the accumulation of thermal runaway smoke in the explosion venting channel and the inner cavity of each single cell 1, reducing the pressure holding time, and having higher safety.

[0087] During the normal charge and discharge cycle of the large-capacity battery, the above-mentioned liquid channel can also make each single cell 1 in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell 1; the gas balance of each single cell is achieved through the gas channel, thereby improving the performance and charge and discharge cycle life of the large-capacity battery.

[0088] like Figure 7 As shown, in order to improve the heat dissipation performance of the above-mentioned large-capacity battery, the top plate 52 of the large-capacity battery shell in this embodiment is provided with avoidance holes that allow the polarity terminals 11 of each single battery 1 to extend out; the polarity terminals 11 of each single battery 1 extend out of the corresponding avoidance holes and the area of ​​the shell 5 around the avoidance holes is fixedly sealed with the shell of the single battery 1.

[0089] It should be noted that the polarity terminal 11 of the single cell battery 1 described here can be a pole of the single cell battery 1. In order to avoid the pole of the single cell battery 1 from being unable to smoothly extend out of the avoidance hole as the polarity terminal 11, a pole adapter can also be connected to the pole of the single cell battery 1, and the overall structure of the pole of the single cell battery 1 and the pole adapter can be used as the polarity terminal 11 of the single cell battery 1.

[0090] In this embodiment, the overall structure of the pole of the single battery 1 and the pole adapter is used as the polarity terminal 11 of the single battery 1.

[0091] In this embodiment, a through groove is provided at the portion where the polarity terminal 11 of the single battery 1 extends out of the avoidance hole, which serves as a clamping portion for the heat transfer tube 8; the heat transfer tube 8 is fixed in the through groove, and when the temperature of the large-capacity battery is higher than a set threshold, a heat transfer medium with a lower temperature is introduced into the heat transfer tube 8 to cool the large-capacity battery; when the temperature of the large-capacity battery is lower than the set threshold, a heat transfer medium with a higher temperature is introduced into the heat transfer tube 8 to heat the large-capacity battery; by controlling the temperature of the heat transfer medium, it can be ensured that the large-capacity battery always operates at a normal operating temperature.

[0092] In order to prevent condensation generated by the heat transfer tube 8 from causing safety problems, in this embodiment, an insulating sealant layer can also be laid on the top plate 52 of the outer shell, and a part of the polarity terminal 11 of each single battery 1 is covered by the insulating sealant layer, and the electrical connection part (which can be the upper end surface) of the polarity terminal 11 of each single battery 1 extends out of the insulating sealant layer and is connected to the electrical connector (based on the electrical connector, the parallel connection of each single battery 1 or the series connection of multiple large-capacity batteries can be achieved); the main part of the heat transfer tube 8 is covered by the insulating sealant layer, and the liquid inlet and outlet ends of the heat transfer tube 8 extend out of the insulating sealant layer for connection with the liquid cooling equipment.

[0093] Furthermore, since the polarity terminal 11 is directly exposed to the external environment, there is a great safety hazard during use due to the polarity terminal 11 being charged. Figure 8 and Fig. 9As shown, in this embodiment, an insulating protective cover 9 is arranged on the top of the large-capacity battery to provide insulation protection for the polarity terminal 11, thereby avoiding the potential safety hazard of the polarity terminal 11 being exposed during the operation of the large-capacity battery, and also avoiding the problem of some foreign matter in the external environment falling into the position of the polarity terminal 11 and causing a short circuit in the large-capacity battery, thereby improving the safety of the large-capacity battery.

[0094] It should be noted that if the insulating protective cover 9 completely wraps the polarity terminal 11, it will make the electrical connection of such large-capacity batteries more difficult. Therefore, in this embodiment, a slit is opened on the side wall of the insulating protective cover 9 parallel to the xz plane, through which the electrical connector can be connected to the polarity terminal 11, thereby achieving electrical connection.

[0095] It should also be noted that the side wall of the insulating protective cover 9 needs to be provided with channels for the liquid inlet and liquid outlet ends of the heat transfer tube 8 to extend out.

[0096] Example 5

[0097] like Fig.10 and Fig.11 As shown, it is a schematic diagram of the structure of the large-capacity battery of this embodiment. Different from Embodiment 4, this embodiment has two through holes on the end plate 53 on one side of the shell 5 (the side plate parallel to the yz plane), and the two through holes are respectively connected to the gas channel 7 and the liquid channel 6, and the through hole connected to the liquid channel 6 is connected to the explosion-proof pipe, and an explosion-proof membrane is fixed in the explosion-proof pipe as one of the explosion-proof parts 3 of the large-capacity battery, and the explosion-proof membrane is fixed in the through hole connected to the gas channel 7 as another explosion-proof part 3 of the large-capacity battery.

[0098] In some other embodiments, a through hole can be opened in each of the left and right side end plates 53 of the outer shell 5 (side plates parallel to the yz plane), each through hole is respectively connected to the gas channel 7 and the liquid channel 6, and an explosion-proof pipe is connected at the through hole, and an explosion-proof membrane is fixed in the explosion-proof pipe, which serves as two explosion-proof parts 3 of the large-capacity battery.

[0099] In some other embodiments, two through holes may be respectively opened on the left and right side end plates 53 of the outer shell 5 (side plates parallel to the yz plane), and the two through holes on each end plate 53 are respectively connected to the gas channel 7 and the liquid channel 6, and explosion-proof pipes are connected at the through holes, and explosion-proof membranes are fixed in the explosion-proof pipes, which serve as two explosion-proof parts 3 of the large-capacity battery.

[0100] When any single cell 1 in the above-mentioned large-capacity battery undergoes thermal runaway, since both the gas channel and the liquid channel can be used as explosion-proof channels, the electrolyte and thermal runaway smoke can be discharged from different explosion-proof channels, thereby reducing the accumulation of thermal runaway smoke in the explosion-proof channels and the inner cavities of each single cell 1, reducing the pressure holding time, and having higher safety.

[0101] During the normal charge and discharge cycle of the large-capacity battery, the liquid channel can also place each single cell 1 in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell 1; the gas channel is used to achieve gas balance in each single cell, thereby improving the performance and charge and discharge cycle life of the large-capacity battery; improving the performance and charge and discharge cycle life of the large-capacity battery.

Claims

1. A large capacity battery, characterized in that: It includes a plurality of single batteries arranged in the same direction and an explosion relief channel; The explosion venting channel has at least two explosion venting parts. When any single battery undergoes thermal runaway, the thermal runaway smoke is discharged from the explosion venting part through the explosion venting channel.

2. The large-capacity battery according to claim 1, characterized in that: There are two explosion-relief parts, which are respectively located at the two ends of the explosion-relief channel.

3. The large-capacity battery according to claim 2, characterized in that: The explosion relief channel is connected with the inner cavity of each single battery.

4. A large capacity battery, characterized in that: It includes a plurality of single batteries arranged in the same direction and at least two explosion relief channels; Each explosion relief channel has at least one explosion relief part. When any single battery undergoes thermal runaway, the thermal runaway smoke is discharged from the explosion relief part through at least two explosion relief channels.

5. The large-capacity battery according to claim 4, characterized in that: There are two explosion-relief channels, and each explosion-relief channel has an explosion-relief portion located at one end of the explosion-relief channel.

6. The large-capacity battery according to claim 5, characterized in that: One of the explosion-relief channels is located at the bottom of each single battery and is communicated with the inner cavity of each single battery; the other explosion-relief channel is located at the top of each single battery and covers the explosion-relief opening of each single battery.

7. The large capacity battery according to any one of claims 1 to 6, characterized in that: It also includes a hollow pipe fixedly connected to each single battery, the inner cavity of the hollow pipe is used as an explosion relief channel, and the explosion relief part is fixed on the hollow pipe.

8. The large capacity battery according to any one of claims 1 to 6, characterized in that: It also includes a housing, wherein a plurality of single cells are arranged in the housing in the same direction; The explosion relief passage is a passage located inside the shell, and the explosion relief portion is fixed on the shell and corresponds to the explosion relief passage.

9. The large-capacity battery according to claim 8, characterized in that: The top plate of the shell is provided with avoidance holes corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the top plate area of ​​the shell corresponding to the avoidance holes is fixedly sealed with the shell of the single cell; the part where the polarity terminals of each single cell extend out of the avoidance holes is provided with a heat transfer pipe clamping part; The heat transfer tube is fixed on the heat transfer tube clamping part of the polarity terminal of each single battery.

10. The large-capacity battery according to claim 9, characterized in that: An insulating sealant layer is laid on the top plate of the shell; the electrical connection parts of the polarity terminals of each single battery extend out of the insulating sealant layer, and the liquid inlet and outlet ends of the heat transfer tube extend out of the insulating sealant layer.

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