High-capacity battery assembly

Abstract

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery assembly. And the heat dissipation performance of the related high-capacity battery is improved. Comprising a high-capacity battery and a liquid cooling plate assembly, the high-capacity battery comprises a shell and a plurality of single batteries, the plurality of single batteries are arranged in the shell along the same direction; the shell is provided with a shared cavity, and the inner cavity of the shared cavity is communicated with the inner cavities of all the single batteries; the top plate of the shell is provided with avoiding holes corresponding to the polar terminals of the single batteries; each single battery polarity terminal extends out of the avoiding hole, and the shell top plate area corresponding to the avoiding hole is fixedly sealed with the single battery shell; and the liquid cooling plate assembly is arranged at the bottom of the large-capacity battery. According to the utility model, the liquid cooling plate assembly is arranged at the bottom of the high-capacity battery, and the heat of the high-capacity battery can be timely conducted out based on the liquid cooling plate assembly, so that the balanced heat dissipation of each single battery in the high-capacity battery is realized, and the use safety of the high-capacity battery is improved.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, in particular to a large-capacity battery assembly. 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, Chinese patent CN220324596U discloses a large-capacity battery, the structure of which is as follows Figure 1 As shown, this type of large-capacity battery includes a housing 1 and a plurality of single cells 2, and the plurality of single cells 2 are connected in parallel in sequence and arranged in the inner cavity of the housing 1; the housing 1 is provided with a shared chamber (the shared chamber described here is an electrolyte shared chamber 3 and / or a gas shared chamber 4), and the shared chamber is connected to the inner cavity of each single cell. The electrolyte and / or gas in the inner cavity of each single cell is connected through the electrolyte shared chamber and / or the gas shared chamber, so that the electrolyte and / or gas of all single cells are in the same system, reducing the difference between each single cell, and improving the consistency between each single cell to a certain extent, thereby improving the cycle life of the large-capacity battery to a certain extent.

[0005] The above-mentioned large-capacity batteries will release heat during use. If the heat is not dissipated in time, the battery life will be greatly shortened, energy loss will be aggravated, and even safety hazards such as spontaneous combustion and fire will occur. Therefore, it is particularly important to improve the heat dissipation performance of the above-mentioned large-capacity batteries. Summary of the invention

[0006] The utility model aims to provide a large-capacity battery assembly to improve the heat dissipation performance of related large-capacity batteries.

[0007] The technical solution of the utility model is to provide a large-capacity battery assembly, which is special in that it includes a large-capacity battery and a liquid cooling plate assembly;

[0008] The large-capacity battery includes a shell and a plurality of single cells; the plurality of single cells are arranged in the shell in the same direction; the shell is provided with at least one shared chamber, the inner cavity of the shared chamber is connected with the inner cavities of all the single cells; avoidance holes are provided on the top plate of the shell 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;

[0009] The liquid cooling plate assembly is arranged at the bottom of the large-capacity battery.

[0010] The utility model arranges a liquid cooling plate assembly at the bottom of the large-capacity battery. Based on the liquid cooling plate assembly, the heat of such large-capacity battery can be timely discharged, and balanced heat dissipation of each single cell in the large-capacity battery is achieved, thereby improving the safety of the large-capacity battery.

[0011] Furthermore, the shared chamber is an electrolyte shared chamber, and the bottom plate of the shell has a protrusion in the direction away from the top plate of the shell to form the electrolyte shared chamber; for large-capacity batteries with such electrolyte shared chambers, the liquid cooling plate assembly includes two first liquid cooling plates; the two first liquid cooling plates extend along the length direction of the shell, and are respectively arranged on the outer surface of the bottom plate of the shell (where the outer surface of the bottom plate of the shell is the surface away from the inner cavity of the shell) and on both sides of the electrolyte shared chamber. Based on the first liquid cooling plate, while achieving balanced heat dissipation of each single cell in the large-capacity battery, the flatness of the bottom of the large-capacity battery assembly can also be improved, so that such large-capacity battery assembly has better stability when placed.

[0012] Furthermore, the liquid cooling plate assembly also includes a second liquid cooling plate; the second liquid cooling plate is fixed to the bottom of the first liquid cooling plate and the outer bottom surface of the electrolyte sharing chamber. The first liquid cooling plate can be cooled by the portion where the second liquid cooling plate contacts the first liquid cooling plate, further reducing the temperature of the first liquid cooling plate, thereby improving the cooling effect of the first liquid cooling plate on the large-capacity battery; in addition, the temperature of the electrolyte in the electrolyte sharing chamber can be further reduced by the portion where the second liquid cooling plate contacts the outer bottom surface of the electrolyte sharing chamber, thereby optimizing the cooling effect of the entire large-capacity battery.

[0013] Furthermore, the first liquid cooling plate is insulated from the large-capacity battery; the first liquid cooling plate has a size in the x direction that is larger than the size of the outer shell, wherein the x direction is the length direction of the outer shell. When such a large-capacity battery assembly is assembled into an energy storage device, the two ends of the first liquid cooling plate can be used as support parts and fixed to the support frame of the energy storage box, which is simple and convenient to operate and can also improve the stability of such a large-capacity battery assembly in the energy storage box.

[0014] Furthermore, support blocks extending along the x-direction are fixed on the outer surface of the bottom plate of the shell and on both sides of the electrolyte shared chamber; through holes penetrating the support blocks are opened on the support blocks along the x-direction; and two first liquid cooling plates are inserted into the through holes one by one. No additional fixed connection means is required between the first liquid cooling plates and the large-capacity batteries. The assembly process is relatively simple, and the cooperation with the entire large-capacity battery is more reliable.

[0015] Furthermore, the shared chamber is an electrolyte shared chamber; a support member is arranged between the bottom plate of the outer shell and each single battery; the support member includes at least two support ribs; a liquid channel is formed between the two support ribs, which serves as an electrolyte shared chamber; for large-capacity batteries with such electrolyte shared chambers, since the bottom plate of the outer shell is flat, the second liquid cooling plate can be directly fixed on the outer surface of the bottom plate of the outer shell to dissipate heat for the large-capacity batteries.

[0016] Furthermore, the shared chamber is a gas shared chamber, which is a gas channel located between the top plate of the housing and each single battery, and the gas channel is connected to the gas area of ​​the inner cavity of each single battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a large-capacity battery in the background technology;

[0018] Figure 2 This is a schematic diagram of the structure of a large-capacity battery assembly in Example 1;

[0019] Figure 3 Schematic diagram of the local structure of the large-capacity battery assembly in Example 1 (removed Figure 2 (Schematic diagram of the structure behind the end plate on one side);

[0020] Figure 4 It is a schematic diagram of the cylindrical structure of a large-capacity battery;

[0021] Figure 5 This is a schematic diagram of the structure of a large-capacity battery assembly in Example 2;

[0022] Figure 6 A schematic diagram of the structure of a large-capacity battery assembly in Example 3 Figure 1 ;

[0023] Figure 7 A schematic diagram of the structure of a large-capacity battery assembly in Example 3 Figure 2 (and Figure 6 different perspectives);

[0024] Figure 8 This is a schematic diagram of the structure of another large-capacity battery assembly in Example 3;

[0025] Fig. 9 The structure of the cylinder in Example 4 is shown in FIG. Figure 1 ;

[0026] Fig.10 The structure of the cylinder in Example 4 is shown in FIG. Figure 2 (and Fig. 9 different perspectives);

[0027] Fig.11 This is a schematic diagram of the structure of a large-capacity battery assembly in Example 4;

[0028] Fig.12 This is a schematic diagram of the structure of a large-capacity battery assembly in Example 5;

[0029] Fig.13 This is a schematic diagram of the structure of a cylinder in Example 6;

[0030] Fig.14 It is a schematic diagram of the partial structure of another cylinder in Example 6;

[0031] Fig.15 This is a schematic diagram of the structure of a large-capacity battery assembly in Example 6;

[0032] The accompanying drawings in the figure are marked as follows:

[0033] 1. Shell; 11. Shell top plate; 12. Shell bottom plate; 13. Cylinder; 14. Avoidance hole; 15. Shell side wall; 16. Pole adapter; 2. Single battery; 3. Electrolyte shared chamber; 4. Gas shared chamber; 5. First liquid cooling plate; 51. Liquid inlet; 52. Liquid outlet; 6. Second liquid cooling plate; 7. Support block; 8. Through hole; 9. Support member; 91. First support rib; 92. Second support rib; 10. Support rib. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top, bottom" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation of the present invention. In addition, the terms "first, second, third, fourth, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] The utility model is a large-capacity battery assembly, comprising a large-capacity battery and a liquid cooling plate assembly arranged at the bottom of the large-capacity battery;

[0038] The large-capacity battery includes a shell and a plurality of single cells; the plurality of single cells are arranged in the shell in the same direction, and the inner cavity of the shell is connected with the inner cavities of all the single cells.

[0039] A rectangular shell is usually used. For ease of description, the length direction of the shell is defined as the x direction, the width direction of the shell is defined as the y direction, and the height direction of the shell is defined as the z direction.

[0040] The utility model does not specifically limit the shell structure, and at least the following two structures can be adopted:

[0041] The first structure includes a cylinder with open ends at both ends (i.e., the end parallel to the yz plane is the open end) and end plates respectively fixed to the two open ends of the cylinder (i.e., the end plates are parallel to the yz plane);

[0042] The second structure includes a cylinder with open ends at the top and bottom (i.e., the ports parallel to the xy plane are open ends) and an upper cover plate and a lower cover plate respectively fixed to the open ends at the top and bottom of the cylinder (i.e., the upper cover plate and the lower cover plate are both parallel to the xy plane, and the lower cover plate can also be integrally formed with the cylinder);

[0043] In the following description, the plates in the housing parallel to the xy plane are defined as the housing top plate and the housing bottom plate, respectively, and the plates in the housing parallel to the yz plane are defined as the end plates.

[0044] Preferably, a shared chamber may be provided in the outer shell so that the inner cavity of the shared chamber is connected to the inner cavities of all the single cells to achieve the above-mentioned connection effect.

[0045] It should be noted that:

[0046] The above-mentioned shared chamber can be an electrolyte shared chamber, through which each single cell can be placed in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell; improving the performance and charge-discharge cycle life of large-capacity batteries. The electrolyte shared chamber described here is a liquid channel extending along the length direction of the shell between the shell bottom plate and each single cell, and the liquid channel can be integrally formed with the shell bottom plate, or formed by arranging a support between the lower cover plate of the single cell and the shell bottom plate.

[0047] The above-mentioned shared chamber may also be a gas shared chamber, through which the gas balance of each single battery is achieved, and the performance and charge-discharge cycle life of the large-capacity battery can also be improved.

[0048] The above-mentioned shared chamber can also be a gas-liquid shared chamber. Through a gas-liquid shared chamber, each single battery can be placed in a unified electrolyte environment and gas environment, thereby improving the performance and charge-discharge cycle life of large-capacity batteries.

[0049] In order to facilitate the electrical connection of such large-capacity batteries, avoidance holes are opened on the top plate of the outer shell corresponding to the polarity terminals of each single cell; each single cell polarity terminal extends out of the corresponding avoidance hole as a large-capacity battery polarity terminal (all single cell polarity terminals located on one side serve as the first polarity terminals of the large-capacity battery, and all single cell polarity terminals located on the other side serve as the second polarity terminals of the large-capacity battery, wherein the polarities of the first polarity terminal and the second polarity terminal are opposite), and the top plate area of ​​the outer shell corresponding to the avoidance hole (i.e., the top plate area of ​​the outer shell around the avoidance hole) is fixedly sealed with the single cell shell, so that the avoidance hole portion of the outer shell top plate is sealed.

[0050] It should be noted that the single cell polarity terminal described here can be a single cell pole. In order to avoid the single cell pole being unable to smoothly extend out of the avoidance hole as a polarity terminal or the height of the extended avoidance hole does not meet the set requirements, a pole adapter can also be connected to the single cell pole, and the overall structure of the single cell pole and the pole adapter can be used as the single cell polarity terminal.

[0051] In order to improve the heat dissipation performance of such large-capacity batteries, the utility model arranges a liquid cooling plate assembly at the bottom thereof. Based on the liquid cooling plate assembly, the heat of such large-capacity batteries can be timely discharged, thereby achieving balanced heat dissipation of each single cell in the large-capacity battery, thereby improving the safety of the large-capacity battery.

[0052] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0053] Example 1

[0054] Combination Figure 2 and Figure 3 It can be seen that the large-capacity battery assembly of this embodiment includes a large-capacity battery and a liquid cooling plate assembly.

[0055] The large-capacity battery includes a housing 1 and single cells 2 arranged in the housing 1 .

[0056] The single battery 2 in this embodiment is a square shell battery, and the number is 10. In other embodiments, the number and shape of the single battery can be adjusted according to actual needs. The inner cavity of each single battery 2 includes an electrolyte area and a gas area.

[0057] On the top plate 11 of the housing, a gas sharing chamber 4 is provided along the x direction, and the inner cavity of the gas sharing chamber 4 is connected to the inner gas area of ​​each single cell 2. On the top plate 11 of the housing, a avoidance hole 14 is provided corresponding to the polarity terminal of each single cell; each single cell polarity terminal extends out of the corresponding avoidance hole as a large-capacity battery polarity terminal, and the housing top plate area corresponding to the avoidance hole is fixedly sealed with the housing of the single cell. Figure 2 and Figure 3 It can be seen from the figure that the polarity terminal of the single cell battery in this embodiment is an integral structure in which the single cell battery pole and the pole adapter 16 cooperate with each other.

[0058] An electrolyte sharing chamber 3 is provided on the housing bottom plate 12 along the x direction, and the inner cavity of the electrolyte sharing chamber 3 is connected to the inner cavity electrolyte area of ​​each single battery 2 .

[0059] In some other embodiments, only an electrolyte sharing chamber 3 or a gas sharing chamber 4 may be provided, or a gas-liquid sharing chamber may be provided on the side wall 15 of the shell along the x direction, and the inner cavity of the gas-liquid sharing chamber is connected to the electrolyte area and the gas area of ​​the inner cavity of each single battery 2.

[0060] In some other embodiments, the gas sharing chamber 4 can also be used as an explosion-proof channel, that is, during the normal operation of the large-capacity battery, the inner cavity of each single cell is not connected to the explosion-proof channel. When any single cell suffers from thermal runaway, the explosion-proof membrane on the top of the single cell is broken by the smoke in the inner cavity. Then, the inner cavity of the single cell is connected to the explosion-proof channel, and the smoke is discharged through the explosion-proof channel, thereby improving the safety of the large-capacity battery.

[0061] In this embodiment, the electrolyte shared chamber 3 is a liquid channel arranged on the bottom plate 12 of the housing, and the gas shared chamber 4 is a gas channel arranged on the top plate 11 of the housing. For specific structures, see Figure 4 , Figure 4 This is a schematic diagram of the structure of the cylinder 13 of the large-capacity battery of this embodiment. It can be seen from the figure that the bottom plate 12 of the shell has a protrusion in the direction away from the top plate 11 of the shell, so as to form an electrolyte sharing chamber 3; the top plate 11 of the shell has a protrusion in the direction away from the bottom plate 12 of the shell, so as to form a gas sharing chamber 4. Figure 4 The structure of the cylinder 13 shown can be integrally formed by an aluminum extrusion process.

[0062] In order to improve the heat dissipation performance of such large-capacity batteries, this embodiment considers providing a liquid cooling plate assembly on the housing bottom plate 12 .

[0063] from Figure 4It can be seen that the bottom plate 12 of the large-capacity battery housing is non-planar due to the presence of the electrolyte sharing chamber 3. If a liquid cooling plate is directly arranged on the outer bottom surface of the electrolyte sharing chamber 3, the heat dissipation effect is poor due to the small contact area between the liquid cooling plate and the housing 1. In addition, such a structure will also lead to poor stability when the large-capacity battery assembly is placed.

[0064] In order to solve the above problems at the same time, Figure 2 As shown, in this embodiment, first liquid cooling plates 5 are respectively provided in the outer regions of the housing bottom plate 12 on both sides of the electrolyte sharing chamber 3, and the first liquid cooling plates 5 extend along the x direction. As can be seen from the figure, in this embodiment, a liquid inlet 51 and a liquid outlet 52 are provided on one end surface of the two first liquid cooling plates 5, and the coolant enters the liquid cooling plate through the liquid inlet 51 and is discharged from the liquid outlet 52.

[0065] In some other embodiments, the liquid inlet 51 and the liquid outlet 52 may be located on two end surfaces of the first liquid cooling plate 5 , respectively.

[0066] In some other embodiments, the two first liquid cooling plates 5 can also be connected in series, that is, the liquid outlet 52 of one of the liquid cooling plates is connected to the liquid inlet 51 of the other first liquid cooling plate 5, and the coolant enters the first liquid cooling plate 5 through the liquid inlet 51 of one of the liquid cooling plates, is discharged from the liquid outlet 52 of the first liquid cooling plate 5, and enters the first liquid cooling plate 5 through the liquid inlet 51 of the other first liquid cooling plate 5, and is discharged from the liquid outlet 52 of the first liquid cooling plate 5.

[0067] The first liquid cooling plate 5 can be fixed to the housing bottom plate 12 by screw connection or bonding. If bonding is used, thermally conductive adhesive with good thermal conductivity is preferably used for bonding.

[0068] It should be noted that:

[0069] 1. The area of ​​the bottom plate 12 of the shell on both sides of the electrolyte sharing chamber 3 is Figure 4 a area in;

[0070] 2. When the large-capacity battery shell is charged, insulation should be ensured between the first liquid cooling plate and the large-capacity battery. Usually, the large-capacity battery shell or the first liquid cooling plate can be insulated, such as spraying insulating paint on the surface of the large-capacity battery shell or the first liquid cooling plate, or adding an insulating pad between the two. The first liquid cooling plate can also be prepared with an insulating material with greater hardness;

[0071] 3. If screw connection is adopted, the insulation of the connection part must be ensured, which can be achieved by using insulating screws or installing insulating sleeves on the connection part;

[0072] In order to make the cylinder 13 have a more regular structure, Figure 2It can be seen that in the x direction, the size of the first liquid cooling plate 5 is equal to the size of the shell 1; in the y direction, the size of the first liquid cooling plate 5 is equal to the size of the shell bottom plate 12 area on both sides of the electrolyte shared chamber 3, and the outer wall of the first liquid cooling plate 5 and the shell side wall 15 are located in the same plane; in the z direction, the size of the first liquid cooling plate 5 is equal to the size of the outer wall of the electrolyte shared chamber 3, and the bottom surface of the first liquid cooling plate 5 and the outer bottom surface of the electrolyte shared chamber 3 are located in the same plane.

[0073] In this embodiment, a first liquid cooling plate 5 is added to the bottom plate 12 area of ​​the shell on both sides of the electrolyte sharing chamber 3 to achieve balanced heat dissipation of each single battery 2 in the large-capacity battery. Figure 4 It can also improve the flatness of the bottom of the large-capacity battery assembly, so that such large-capacity battery assemblies have better stability when placed.

[0074] Example 2

[0075] In order to further improve the heat dissipation performance of the large-capacity battery assembly, based on Example 1, this embodiment adds a second liquid cooling plate 6 at the bottom of the large-capacity battery assembly.

[0076] like Figure 5 , which is a schematic diagram of the structure of the large-capacity battery assembly of this embodiment. It can be seen from the figure that the second liquid cooling plate 6 is fixed to the bottom of the large-capacity battery in Example 1, that is, located at the bottom of the first liquid cooling plate 5 and the outer bottom surface of the electrolyte sharing chamber 3.

[0077] The second liquid cooling plate 6 can also be fixed to the bottom of the first liquid cooling plate 5 and the housing bottom plate 12 by screw connection or bonding. If bonding is used, thermally conductive adhesive with good thermal conductivity is preferably used for bonding.

[0078] Through the part where the second liquid cooling plate 6 contacts the first liquid cooling plate 5, on the one hand, the first liquid cooling plate 5 can be cooled, and the temperature of the first liquid cooling plate 5 can be further reduced, thereby improving the heat dissipation effect of the first liquid cooling plate 5 on the large-capacity battery; on the other hand, through the part where the second liquid cooling plate 6 contacts the outer bottom surface of the electrolyte sharing chamber 3, the temperature of the free electrolyte in the electrolyte sharing chamber 3 can be further reduced, thereby optimizing the heat dissipation effect of the entire large-capacity battery; on the third hand, when any single cell has thermal runaway, the free electrolyte in the electrolyte sharing chamber absorbs heat and vaporizes, aggravating the thermal runaway. In this embodiment, the first liquid cooling plate 5 and the second liquid cooling plate 6 are attached to the outer periphery of the electrolyte sharing chamber 3 to cool the free electrolyte in the electrolyte sharing chamber, slow down the vaporization of the free electrolyte, thereby slowing down the process of thermal runaway of the entire large-capacity battery and improving the safety performance of the entire large-capacity battery.

[0079] Example 3

[0080] Based on having Figure 4 When the large-capacity battery of the cylinder 13 shown is assembled into an energy storage device, the area of ​​the shell bottom plate 12 located on both sides of the electrolyte shared chamber 3 is generally used as a support surface, and an insulating pad needs to be added between the support surface and the energy storage box support frame, or the support surface needs to be insulated; making the process of assembling energy storage devices based on such large-capacity batteries more complicated.

[0081] In order to overcome the above problems, this embodiment optimizes the large-capacity battery assembly of embodiment 1 or embodiment 2. On the basis of the above embodiments, this embodiment increases the size of the first liquid cooling plate 5 in the x direction, and when the large-capacity battery housing is charged, insulation is required between the first liquid cooling plate 5 and the large-capacity battery. In order to improve the supporting strength of the first liquid cooling plate 5, this embodiment selects a first liquid cooling plate 5 made of metal material, and at the same time, the first liquid cooling plate 5 is insulated. A layer of insulating material can be coated on its surface, such as spraying insulating paint, etc. It can also be made of insulating material, but the supporting strength of the first liquid cooling plate 5 needs to be ensured. In some other embodiments, an insulating pad can also be set between the first liquid cooling plate 5 and the large-capacity battery.

[0082] like Figure 6 , Figure 7 and Figure 8 FIG. 1 is a schematic diagram of the structure of a large-capacity battery assembly according to this embodiment, wherein Figure 6 and Figure 7 Based on Example 1, the size of the first liquid cooling plate 5 in the x direction is increased. Figure 8 Based on the second embodiment, the size of the first liquid cooling plate 5 in the x direction is increased.

[0083] It can be seen from the figure that, unlike Example 1 and Example 2, the first liquid cooling plate 5 of this embodiment has a size in the x direction that is larger than the size of the outer shell 1, that is, in the x direction, both ends of the first liquid cooling plate 5 extend out of the outer shell 1. When such a large-capacity battery assembly is assembled into an energy storage device, the two ends of the first liquid cooling plate 5 can be used as support parts and fixed to the support frame of the energy storage box. The operation is simple and convenient, and the stability of such a large-capacity battery assembly in the energy storage box can be improved.

[0084] Example 4

[0085] Different from the above embodiment, the large capacity battery in this embodiment has Fig. 9 and Fig.10 The barrel 13 ( Fig. 9 and Fig.10 Take the case where the top plate 11 of the housing is not provided with the gas sharing chamber 4 as an example, that is, in this embodiment Figure 4On the basis of the cylinder 13 shown, support blocks 7 are respectively provided in the outer areas of the shell bottom plate 12 on both sides of the electrolyte sharing chamber 3, and the support blocks 7 extend along the x direction. As can be seen from the figure, a through hole 8 is provided on the support block 7 along the x direction. Figure 4 In this embodiment, the bottom of the cylinder 13 has a larger size in the y direction, so it has better stability when placed.

[0086] In this embodiment, the through hole 8 passes through the support block 7 in the x direction; Fig.11 As shown, in this embodiment, the first liquid cooling plate 5 having a length greater than the cylinder 13 and a cross section matching the cross section of the through hole 8 is inserted into the through hole 8 of the support block 7, and both ends of the first liquid cooling plate 5 are ensured to extend out of the housing 1. When a large-capacity battery assembly having such a cylinder 13 assembly is assembled into an energy storage device, both ends of the first liquid cooling plate 5 can also be used as a support part and fixed to the support frame of the energy storage box, which is simple and convenient to operate, and can also improve the stability of such a large-capacity battery assembly in the energy storage box.

[0087] It should be noted that when the large-capacity battery housing is charged, the first liquid cooling plate 5 in this embodiment also needs to be insulated, similar to the third embodiment.

[0088] In this embodiment, the cylinder 13 can be integrally formed by an aluminum extrusion process. For the cylinder 13 formed by the aluminum extrusion process, in the x direction, the size of the support block 7 is equal to the size of the cylinder 13, and the end face of the support block 7 is located in the same plane as the end face of the cylinder 13. In order to make the cylinder 13 assembly have a more regular structure, in the y direction, the size of the support block 7 is equal to the size of the outer shell bottom plate 12 area on both sides of the electrolyte shared chamber 3, and the outer side wall of the first liquid cooling plate 5 is located in the same plane as the outer shell side wall 15. In the z direction, the size of the first liquid cooling plate 5 is equal to the size of the outer side wall of the electrolyte shared chamber 3, and the outer bottom surface of the first liquid cooling plate 5 is located in the same plane as the outer bottom surface of the electrolyte shared chamber 3. It should be noted that the outer shell bottom plate 12 area on both sides of the electrolyte shared chamber 3 is Figure 4 The a area in .

[0089] It can also be understood that the present embodiment uses an aluminum extrusion process to integrally form a cylinder 13 component having the following structure:

[0090] Both ends of the cylinder 13 assembly are open ends; the inner bottom surface has two bosses extending along the x direction and arranged in the y direction with the same length as the cylinder 13, the top surface of the boss is the support surface of each single battery 2, and in the y direction, a first channel is formed between the two bosses, which serves as an electrolyte shared chamber 3; the above-mentioned through hole 8 is opened in the boss along the x direction.

[0091] In this embodiment, the first liquid cooling plate 5 is directly inserted into the through hole 8 on the cylinder 13, and no additional fixing means are required. The assembly process is relatively simple and the cooperation with the entire large-capacity battery is more reliable. In addition, in the process of fixing the first liquid cooling plate 5, no additional fixing parts are required at the connection between the two, so that this type of large-capacity battery assembly has better sealing.

[0092] Example 5

[0093] In order to further improve the heat dissipation performance of the large-capacity battery assembly described in Example 4, this embodiment is based on Example 4 and further includes a second liquid cooling plate 6 at the bottom of the large-capacity battery assembly.

[0094] like Fig.12 , which is a schematic structural diagram of a large-capacity battery assembly according to this embodiment; it can be seen from the figure that the second liquid cooling plate 6 is fixed to the bottom plate 12 of the housing.

[0095] The second liquid cooling plate 6 can also be fixed to the first liquid cooling plate 5 and the housing bottom plate 12 by screw connection or bonding. If bonding is used, thermally conductive adhesive with good thermal conductivity is preferably used for bonding.

[0096] Through the second liquid cooling plate 6, on the one hand, the first liquid cooling plate 5 can be cooled, and the temperature of the first liquid cooling plate 5 can be further reduced, thereby improving the heat dissipation effect of the first liquid cooling plate 5 on the large-capacity battery; on the other hand, through the portion where the second liquid cooling plate 6 contacts the outer bottom surface of the electrolyte sharing chamber 3, the temperature of the free electrolyte in the electrolyte sharing chamber 3 can be further reduced, thereby optimizing the heat dissipation effect of the entire large-capacity battery; on the third hand, when any single cell has thermal runaway, the free electrolyte in the electrolyte sharing chamber absorbs heat and vaporizes, aggravating the thermal runaway. In this embodiment, the first liquid cooling plate 5 and the second liquid cooling plate 6 of the large-capacity battery are attached to the outer periphery of the electrolyte sharing chamber 3 to cool the free electrolyte in the electrolyte sharing chamber, slow down the vaporization of the free electrolyte, thereby slowing down the process of thermal runaway of the entire large-capacity battery and improving the safety performance of the entire large-capacity battery.

[0097] Example 6

[0098] Different from the above embodiment, the large capacity battery in this embodiment has Fig.13 and Fig.14 The cylinder 13 shown, that is, in this embodiment, the electrolyte sharing chamber 3 is formed by arranging a support member 9 between the lower cover plate of the single battery 2 and the bottom plate 12 of the housing.

[0099] Fig.13The support member 9 shown is made of aluminum, and its main part is a flat plate, and the shape and size of the flat plate are adapted to the shape and size of the bottom plate 12 of the housing. A second support rib 92 extending along the x direction is provided on the lower surface of the flat plate, and a first support rib 91 extending along the x direction is provided on the upper surface of the flat plate. There are three first support ribs 91, each of which extends along the x direction. The three first support ribs 91 are evenly arranged along the y direction, and an electrolyte sharing chamber 3 is formed between two first support ribs 91. In order to improve the electrolyte sharing effect, a notch is provided on the first support rib 91 located in the middle to ensure that the liquid channels (electrolyte sharing chambers 3) located on both sides thereof are connected to each other.

[0100] Fig.14 Two supporting ribs 10 are directly arranged on the bottom plate 12 of the housing along the x direction, and a liquid channel is formed between the two supporting ribs 10 as the electrolyte sharing chamber 3.

[0101] from Fig.13 and Fig.14 It can be seen that the bottom plate 12 of the large-capacity battery housing with such a cylinder 13 is flat, which is different from the Figure 4 The large-capacity battery in the barrel 13 shown can be placed stably.

[0102] In order to improve the heat dissipation performance of such large-capacity battery components, Fig.15 As shown, in this embodiment, the second liquid cooling plate 6 is directly fixed on the bottom plate 12 of the shell. Based on the second liquid cooling plate 6, the heat of such large-capacity batteries can be timely exported, and the balanced heat dissipation of each single cell 2 in the large-capacity battery can be achieved, thereby improving the safety of the large-capacity battery. At the same time, when any single cell has thermal runaway, the free electrolyte in the electrolyte sharing chamber absorbs heat and vaporizes, aggravating the thermal runaway. In this embodiment, the second liquid cooling plate 6 is set on the bottom plate of the shell, in direct contact with the electrolyte sharing chamber 3, to cool the free electrolyte in the electrolyte sharing chamber, slow down the vaporization of the free electrolyte, and then slow down the process of thermal runaway of the entire large-capacity battery, thereby improving the safety performance of the entire large-capacity battery.

Claims

1. A large-capacity battery assembly, characterized in that: Includes large-capacity battery and liquid cooling plate assembly; The large-capacity battery includes a shell and a plurality of single cells; the plurality of single cells are arranged in the shell in the same direction; the shell is provided with at least one shared chamber, the inner cavity of the shared chamber is connected with the inner cavities of all the single cells; avoidance holes are provided on the top plate of the shell 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 liquid cooling plate assembly is arranged at the bottom of the large-capacity battery.

2. The large-capacity battery assembly according to claim 1, characterized in that: The shared chamber is an electrolyte shared chamber, and the bottom plate of the shell has a protrusion in the direction away from the top plate of the shell to form an electrolyte shared chamber; the liquid cooling plate assembly includes two first liquid cooling plates; the two first liquid cooling plates extend along the length direction of the shell and are respectively arranged on the outer surface of the bottom plate of the shell on both sides of the electrolyte shared chamber.

3. The large-capacity battery assembly according to claim 2, characterized in that: The liquid cooling plate assembly also includes a second liquid cooling plate; the second liquid cooling plate is fixed to the bottom of the first liquid cooling plate and the outer bottom surface of the electrolyte sharing chamber.

4. The large-capacity battery assembly according to claim 2 or 3, characterized in that: The first liquid cooling plate is insulated from the large-capacity battery; in the x direction, the size of the first liquid cooling plate is larger than the size of the outer shell, wherein the x direction is the length direction of the outer shell.

5. The large-capacity battery assembly according to claim 4, characterized in that: Support blocks extending along the x direction are fixed on the outer surfaces of the shell bottom plates on both sides of the electrolyte sharing chamber; through holes penetrating the support blocks are opened on the support blocks along the x direction; and two first liquid cooling plates are inserted into the through holes one by one.

6. The large-capacity battery assembly according to claim 1, characterized in that: The shared chamber is an electrolyte shared chamber; a support member is arranged between the bottom plate of the housing and each single cell; the support member includes at least two support ribs; a liquid channel is formed between the two support ribs as an electrolyte shared chamber; The liquid cooling plate assembly comprises a second liquid cooling plate, and the second liquid cooling plate is fixed on the outer surface of the bottom plate of the housing.

7. The large-capacity battery assembly according to claim 1, 2 or 6, characterized in that: The shared chamber is a gas shared chamber, which is a gas channel located between the top plate of the housing and each single cell. The gas channel is connected to the gas area of ​​the inner cavity of each single cell.

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