Battery cluster and energy storage equipment

Abstract

The utility model provides a battery cluster and energy storage equipment, and mainly solves the problem that the existing high-capacity battery has potential safety hazards. The battery cluster comprises N rows of high-capacity batteries, a liquid inlet pipeline and a liquid return pipeline, a liquid cooling device is arranged on each high-capacity battery; at least one high-capacity battery in the first row of high-capacity batteries and at least one high-capacity battery in the Nth row of high-capacity batteries form a battery module unit; the liquid cooling devices of all the high-capacity batteries in each battery module unit are connected in series, so that each battery module unit is provided with a liquid inlet and a liquid outlet; a liquid inlet of each battery module unit is connected with a liquid inlet pipeline, and a liquid outlet of each battery module unit is connected with a liquid return pipeline. The N rows of high-capacity batteries share one liquid inlet pipeline and one liquid return pipeline, so that the number and the cost of the pipelines are reduced; and meanwhile, the N rows of high-capacity batteries can be connected with the liquid inlet pipeline and the liquid return pipeline only through fewer pipeline joints, so that the cost of the pipelines is further reduced.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to a battery cluster and an energy storage device. Background Technique

[0002] Due to the advantages of high energy, long service life, high rated voltage, high power tolerance, and low self-discharge rate of lithium batteries, they have gradually become the mainstream products of energy storage devices or power battery packs.

[0003] Existing energy storage devices or power battery packs all include multiple large-capacity batteries. Each large-capacity battery is usually composed of multiple single cells in parallel, series, or a combination of series and parallel. Due to the high concentration of single cells in large-capacity batteries, a large amount of heat will be generated during the charging and discharging processes, and this heat will gradually increase. If the generated heat is not released in time, the heat will accumulate, resulting in uneven battery temperature, thereby reducing the battery service life. In severe cases, the thermal balance of the battery is damaged, triggering a series of self-heating side reactions, and then leading to battery safety accidents, there are certain safety hazards. Summary of the Invention

[0004] The utility model provides a battery cluster and an energy storage device, which overcome the problem of safety hazards existing in existing large-capacity batteries.

[0005] To solve the above problems, the technical solution provided by the utility model is as follows:

[0006] A battery cluster includes N rows of large-capacity batteries, an inlet liquid pipeline, and an outlet liquid pipeline, where N is an integer greater than or equal to 2; a liquid cooling device is provided on each large-capacity battery; at least one large-capacity battery in the first row of large-capacity batteries to at least one large-capacity battery in the Nth row of large-capacity batteries form a battery module unit; the liquid cooling devices of all large-capacity batteries in each battery module unit are connected in series. After being connected in series, each battery module unit has an inlet and an outlet; the inlets of each battery module unit are all connected to the inlet liquid pipeline, and the outlets are all connected to the outlet liquid pipeline.

[0007] Further, the number of large-capacity batteries in each battery module unit is the same, and in each battery module unit, the number of large-capacity batteries in each row is the same.

[0008] Further, the inlet liquid pipeline is mainly composed of a plurality of inlet pipe segments spliced together, the outlet liquid pipeline is mainly composed of a plurality of outlet pipe segments spliced together, and the number of inlet pipe segments and outlet pipe segments is the same as the number of battery module units; the inlets of each battery module unit are respectively connected to the branch pipelines of each inlet pipe segment through quick connectors in one-to-one correspondence, and the outlets of each battery module unit are respectively connected to the branch pipelines of each outlet pipe segment through quick connectors in one-to-one correspondence.

[0009] Further, it further includes a support frame, and the large-capacity batteries of multiple battery module units are all placed on a support frame; the support frame includes N support frames arranged in sequence from top to bottom, and a bracket is provided at the bottom of each large-capacity battery; each row of large-capacity batteries is arranged on a support frame through the bracket, and adjacent support frames are connected into a frame body through vertical connecting beams, and at least one sliding roller is provided at the bottom of the Nth support frame.

[0010] Further, it further includes multiple support frames, and the number of support frames is the same as the number of battery module units. The large-capacity batteries of one battery module unit are placed on one support frame. The support frame includes N support frames arranged in sequence from top to bottom; in each battery module unit, a bracket is provided at the bottom of each large-capacity battery, each row of large-capacity batteries is arranged on a support frame through the bracket, and adjacent support frames are connected into a frame body through vertical connecting beams, and at least one sliding roller is provided at the bottom of the Nth support frame.

[0011] Further, the liquid inlet pipeline and the liquid return pipeline are both embedded and installed in the support frame.

[0012] Further, the large-capacity battery includes a housing and multiple single batteries arranged in the same direction inside the housing; a shared chamber is provided inside the housing, and the inner cavity of the shared chamber is communicated with the inner cavities of all single batteries; avoidance holes are provided on the top plate of the housing corresponding to the polarity terminals of each single battery; the polarity terminals of each single battery extend out of the avoidance holes, and the area of the top plate of the housing corresponding to the avoidance holes is fixedly sealed with the single battery housing.

[0013] Further, the liquid cooling device includes a heat transfer pipe, and a clamping part is provided at the part where the polarity terminal of each single battery extends out of the avoidance hole; the heat transfer pipe is fixed on the clamping part of the polarity terminal of each single battery, and the heat transfer pipe is insulated from each single battery.

[0014] Further, an insulating and sealing glue layer is laid on the top plate of the housing, and the liquid inlet port and the liquid outlet port of the heat transfer pipe extend out of the insulating and sealing glue layer; meanwhile, an insulating protective cover is provided on the top of the housing, and the polarity terminals of each single battery are located inside the insulating protective cover.

[0015] Further, it further includes a flue gas confluence pipe, and the flue gas confluence pipe includes multiple flue gas pipelines and a union tee. The multiple flue gas pipelines are connected in series through the union tee, and one port of each union tee is used to connect to an explosion venting component on a large-capacity battery, and the explosion venting component is communicated with the shared chamber inside the housing.

[0016] The present utility model also provides an energy storage device, including an energy storage box body and multiple battery clusters; the multiple battery clusters are arranged from top to bottom, and the battery module units are arranged on a battery rack inside the energy storage box body through a support frame.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] 1. In the battery cluster of the utility model, the large-capacity batteries achieve the circulation of the liquid cooling medium through the liquid cooling device, the liquid inlet pipeline and the liquid return pipeline, thereby realizing the temperature control of the large-capacity batteries, improving the safety during the use of the large-capacity batteries, and avoiding potential safety hazards.

[0019] Secondly, during the circulation of the liquid cooling medium, N rows of large-capacity batteries share one liquid inlet pipeline and one liquid return pipeline, reducing the number and cost of pipelines in the battery cluster. The layout of the pipelines is relatively simple, saving the installation space of the pipelines and improving the energy density of the battery cluster.

[0020] Finally, the liquid cooling devices of all large-capacity batteries in each battery module unit are connected in series. After the series connection, each battery module unit has one liquid inlet and one liquid outlet, enabling N rows of large-capacity batteries to be connected to the liquid inlet pipeline and the liquid return pipeline with fewer pipeline joints. The reduction of pipeline joints facilitates on-site installation, disassembly and maintenance, and further reduces the cost of the pipelines. At the same time, the reduction of pipeline joints results in a relatively low leakage risk and relatively good pipeline reliability.

[0021] 2. In the battery cluster of the utility model, the number of large-capacity batteries in each battery module unit is the same, and in each battery module unit, the number of large-capacity batteries in each row is the same. This kind of quantity limitation makes the heat exchange amount between the liquid cooling medium and each battery module unit as consistent as possible, and the temperature difference between each battery module unit as small as possible, realizing more uniform heat exchange between each battery module unit, balancing the temperature difference between each battery module unit, and improving the safety during the use of the battery cluster.

[0022] 3. In the battery cluster of the utility model, both the liquid inlet pipeline and the liquid return pipeline are spliced pipelines, and each battery module unit is connected to the corresponding liquid inlet pipe section and liquid return pipe section. This kind of spliced pipeline reduces the error and assembly difficulty during the connection of the liquid inlet pipeline and the liquid return pipeline. At the same time, during subsequent maintenance of this kind of spliced pipeline, only the liquid inlet pipe section and the liquid return pipe section of the relevant battery module unit need to be removed for maintenance, without removing the entire liquid inlet pipeline and the liquid return pipeline, greatly improving the convenience of installation, disassembly and maintenance.

[0023] 4. In the battery cluster of the utility model, the liquid inlet of each battery module unit is respectively connected to the branch pipeline of each liquid inlet pipe section through a quick connector in a one-to-one correspondence, and the liquid outlet of each battery module unit is respectively connected to the branch pipeline of each liquid return pipe section through a quick connector in a one-to-one correspondence. The quick connector is convenient to install and can be directly inserted and removed without tools, further improving the convenience of installation or disassembly.

[0024] 5. In the battery cluster of the present utility model, the large-capacity batteries of multiple battery module units are all placed on a support frame. This installation method has good stability and can support N rows of large-capacity batteries more firmly. At the same time, the bottom of the Nth support frame is provided with sliding rollers, and the battery module unit can be easily installed in place through the sliding rollers.

[0025] 6. In the battery cluster of the present utility model, each battery module unit is placed on a corresponding support frame. This installation method enables the battery cluster to have a wide range of applications and can assemble the large-capacity batteries in the battery cluster in a relatively small installation space. At the same time, during later maintenance, only some battery module units need to be removed from the battery rack to achieve maintenance, without removing all battery module units, and the maintenance is relatively convenient.

[0026] 7. In the battery cluster of the present utility model, the liquid inlet pipeline and the liquid return pipeline are embedded in the support frame. This installation method can not only isolate the large-capacity battery from the liquid inlet pipeline and the liquid return pipeline, avoiding the influence of leakage at the pipeline joints on the large-capacity battery, but also improve the integration degree of the entire battery cluster through the embedded installation.

[0027] 8. In the battery cluster of the present utility model, the large-capacity battery includes a housing and a plurality of single cells arranged in the same direction inside the housing. A shared chamber is provided inside the housing. By placing the plurality of single cells inside a housing with a shared chamber and making the shared chamber communicate with the inner cavities of the single cells located inside the housing, the electrolyte and gas of each single cell are shared to ensure the consistency of each single cell, reduce the differences between the electrolytes and gases of each single cell, and to a certain extent improve the consistency between each single cell, thereby improving the cycle life of the large-capacity battery to a certain extent.

[0028] 9. In the battery cluster of the present utility model, the liquid cooling device includes a heat transfer pipe. A clamping part is arranged at the position of the polarity terminal of the large-capacity battery, and the heat transfer pipe is fixed through the clamping part, so that the heat transfer pipe is in direct contact with the polarity terminal of the large-capacity battery, and the heat of the polarity terminal where the heat is most concentrated is conducted to the outside for treatment, thereby realizing more reliable temperature control of the large-capacity battery.

[0029] 10. In the battery cluster of the present utility model, an insulating and sealing adhesive layer is laid on the top plate of the housing. When condensation occurs on the surface of the heat transfer pipe on the polarity terminal, the condensation cannot penetrate into the gap between the polarity terminal and the avoidance hole under the blockage of the insulating and sealing adhesive layer, thereby preventing the occurrence of battery short-circuit. At the same time, an insulating protective cover is used to provide insulation protection for the polarity terminal, avoiding potential safety hazards that may exist when the polarity terminal is exposed during the operation of the large-capacity battery, and also avoiding the problem of short-circuit of the large-capacity battery caused by some foreign objects in the external environment falling into the position of the polarity terminal, improving the safety of the large-capacity battery.

[0030] 11. In the battery cluster of the present utility model, an explosion venting component communicating with the shared chamber is provided on the outer shell; the flue gas manifold is connected to the explosion venting component on the large-capacity battery, and the thermal runaway flue gas of all large-capacity batteries in the battery cluster is collected through the flue gas manifold. When a single battery in any large-capacity battery in the battery cluster undergoes thermal runaway, its thermal runaway flue gas can be discharged through the flue gas manifold, reducing the risk of thermal runaway spread, combustion or explosion of large-capacity batteries or even the entire battery cluster.

[0031] Other advantages, objectives and features of the present utility model will be partially reflected by the following description and partially understood by those skilled in the art through research and practice of the present utility model. Brief Description of the Drawings

[0032] Figure 1 Schematic diagram of the battery cluster in Embodiment 1 (with 4 large-capacity batteries as a battery module unit);

[0033] Figure 2 For Figure 1 Partial enlarged view;

[0034] Figure 3 Schematic diagram of the battery cluster in Embodiment 1 (with 7 large-capacity batteries as a battery module unit);

[0035] Figure 4 Schematic diagram of the connection between the heat transfer pipe, the liquid inlet pipeline and the liquid return pipeline in Embodiment 1;

[0036] Figure 5 Schematic diagram of the structure of the large-capacity battery in Embodiment 1;

[0037] Figure 6 Explosion schematic diagram of the large-capacity battery in Embodiment 1;

[0038] Figure 7 Schematic diagram of the structure of the large-capacity battery in Embodiment 2;

[0039] Figure 8 Explosion schematic diagram of the large-capacity battery in Embodiment 2;

[0040] Figure 9 Schematic diagram of the battery cluster in Embodiment 3 (with 4 large-capacity batteries as a battery module unit);

[0041] Figure 10 Schematic diagram of the battery cluster in Embodiment 3 (with 7 large-capacity batteries as a battery module unit);

[0042] Figure 11 Explosion schematic diagram of the battery cluster in Embodiment 3;

[0043] Figure 12Schematic structural diagram of the support frame in Embodiment 3;

[0044] Figure 13 Schematic installation diagram of the large-capacity battery, the bracket and the support frame in Embodiment 3;

[0045] Figure 14 Schematic assembly diagram of the large-capacity battery and the bracket in Embodiment 3;

[0046] Figure 15 Schematic structural diagram of the bracket in Embodiment 3;

[0047] Figure 16 Schematic structural diagram of the battery cluster in Embodiment 4;

[0048] Figure 17 Explosion diagram of the battery cluster in Embodiment 4.

[0049] Reference numerals: 100 - battery module unit, 101 - liquid inlet, 102 - liquid outlet, 1 - large-capacity battery, 2 - heat transfer pipe, 3 - liquid inlet pipeline, 4 - liquid return pipeline, 5 - quick connector, 6 - flue gas manifold, 7 - bracket, 8 - support frame, 9 - intermediate pipeline, 10 - branch pipeline, 11 - outer shell, 12 - single cell, 13 - polarity terminal, 14 - explosion relief component, 15 - insulating sealant layer, 16 - insulating protective cover, 111 - electrolyte sharing chamber, 112 - gas sharing chamber, 131 - clamping part, 21 - first pipe, 22 - second pipe, 23 - connecting pipe, 31 - liquid inlet pipe section, 41 - liquid return pipe section, 61 - flue gas pipeline, 62 - union tee, 71 - support member, 72 - L-shaped support plate, 81 - first support frame, 82 - second support frame, 83 - vertical connecting beam, 84 - sliding roller, 811 - first support beam, 812 - second support beam. Detailed implementation manners

[0050] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings of the specification. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present utility model shall fall within the protection scope of the present utility model.

[0051] The "in other embodiments" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. In the description of this specification, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0052] In the description of this specification, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate member, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present utility model can be understood according to specific circumstances.

[0053] At the same time, in the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "top, bottom, inner, and outer" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model.

[0054] To meet the different capacity requirements of energy storage devices or power battery packs, existing energy storage devices or power battery packs arrange multiple high-capacity batteries in series and parallel. The high-capacity battery is formed by connecting multiple single cells in parallel or in series, and generally has a housing for protecting each single cell. In some cases, the housing can also be omitted.

[0055] During the charge and discharge operation of the high-capacity battery, the high-capacity battery itself will generate a large amount of heat. If the high-capacity battery is not cooled in time, the performance of the high-capacity battery will decline. Currently, liquid cooling is mainly used to cool the high-capacity battery. When cooling the high-capacity battery by liquid cooling, a liquid cooling device is provided on each high-capacity battery. The liquid cooling device can be in contact with the housing of each single cell, or in contact with the electrode post of each single cell, or a liquid cooling plate or liquid cooling tube in contact with the housing. The above liquid cooling device forms a temperature control system with a temperature control device through an inlet pipeline and a return pipeline to control the temperature of the high-capacity battery. Among them, the temperature control device is a device with heating and / or cooling functions, specifically a water chiller, a heating and cooling machine, or a refrigerating machine with a compressor, etc., for heating or cooling the liquid cooling medium (specifically, it can be water, ethylene glycol / water, propylene ethylene glycol / water, methanol / water, ethanol / water, calcium formate / water, etc.) in the inlet pipeline and the return pipeline.

[0056] To increase the energy density, a plurality of high-capacity batteries in an energy storage device or a power battery pack are arranged in sequence in the horizontal direction, and multiple rows of high-capacity batteries are arranged in sequence in the vertical direction. In this arrangement, each row of high-capacity batteries is provided with a corresponding liquid inlet pipeline and a liquid return pipeline, and each liquid inlet pipeline and liquid return pipeline are connected to the liquid cooling device of each high-capacity battery. When the high-capacity battery is working, the liquid inlet pipeline diverts the liquid cooling medium to the liquid cooling device of each high-capacity battery, and the liquid cooling device controls the temperature of the high-capacity battery. The liquid return pipeline converges the liquid cooling medium after heat exchange by the liquid cooling device of each high-capacity battery. However, the above method has the following defects:

[0057] First, each row of high-capacity batteries is provided with a liquid inlet pipeline and a liquid return pipeline, which results in a large number of liquid inlet pipelines and liquid return pipelines, making the pipeline installation difficult. Moreover, the pipelines occupy a certain space, which also affects the energy density of the high-capacity battery;

[0058] Second, each liquid inlet pipeline and liquid return pipeline are connected to the liquid cooling device of each high-capacity battery, resulting in a large number of pipeline joints, which are prone to leakage and the on-site installation is cumbersome.

[0059] Based on this, this embodiment provides a battery cluster, which includes N rows of high-capacity batteries, a liquid inlet pipeline, and a liquid return pipeline; a liquid cooling device is provided on each high-capacity battery; at least one high-capacity battery in the first row of high-capacity batteries to at least one high-capacity battery in the Nth row of high-capacity batteries form a battery module unit; the liquid cooling devices of all high-capacity batteries in each battery module unit are connected in series, and after being connected in series, each battery module unit has an inlet and an outlet; the inlets of each battery module unit are all connected to the liquid inlet pipeline, and the outlets are all connected to the liquid return pipeline.

[0060] In the above battery cluster, N rows of high-capacity batteries share a liquid inlet pipeline and a liquid return pipeline, reducing the number of pipelines, lowering the pipeline cost. At the same time, the pipeline layout is relatively simple, saving the pipeline installation space and increasing the energy density of the high-capacity battery. Secondly, the liquid cooling devices of all high-capacity batteries in each battery module unit are connected in series. After being connected in series, each battery module unit only has an inlet and an outlet, enabling the N rows of high-capacity batteries to be connected to the liquid inlet pipeline and the liquid return pipeline with fewer pipeline joints. The reduction of pipeline joints not only reduces the leakage of the liquid cooling medium but also reduces the pipeline cost.

[0061] This connection method reduces the number of the liquid inlet pipeline 3 and the liquid return pipeline 4, reduces the difficulty of pipeline assembly and connection. At the same time, if this battery cluster is applied to an energy storage device, the space of the energy storage device can be saved, and the energy density of the energy storage device is improved. At the same time, N rows of large-capacity batteries 1 only need fewer pipeline joints to realize the connection with the liquid inlet pipeline 3 and the liquid return pipeline 4. The reduction of pipeline joints can not only reduce the leakage of the liquid cooling medium, but also further reduce the cost of the pipeline.

[0062] Embodiment 1

[0063] As Figures 1 to 3 shown, this embodiment provides a battery cluster, which includes two rows of large-capacity batteries 1, a liquid inlet pipeline 3 and a liquid return pipeline 4; liquid cooling devices are provided on each large-capacity battery 1; at least one large-capacity battery 1 in the first row of large-capacity batteries 1 and at least one large-capacity battery 1 in the second row of large-capacity batteries 1 form a battery module unit 100; the liquid cooling devices of all large-capacity batteries 1 in each battery module unit 100 are connected in series, and after being connected in series, each battery module unit 100 has an inlet 101 and an outlet 102; the inlets 101 of each battery module unit 100 are all connected to the liquid inlet pipeline 3, and the outlets 102 are all connected to the liquid return pipeline 4.

[0064] In this embodiment, the battery cluster including two rows of large-capacity batteries 1 is taken as an example for description. In other embodiments, the battery cluster may also include 3 rows of large-capacity batteries or 4 rows of large-capacity batteries, etc. At this time, 3 rows of large-capacity batteries share a liquid inlet pipeline 3 and a liquid return pipeline 4; or, 4 rows of large-capacity batteries share a liquid inlet pipeline 3 and a liquid return pipeline 4, and their pipeline connection methods are the same as the structure of two rows of large-capacity batteries 1 sharing a liquid inlet pipeline 3 and a liquid return pipeline 4.

[0065] When the battery cluster includes 3 rows of large-capacity batteries, the 3 rows of large-capacity batteries can form multiple battery module units 100. At least one large-capacity battery 1 in the first row of large-capacity batteries, to at least one large-capacity battery 1 in the 3rd row of large-capacity batteries form a battery module unit. That is to say, at least one large-capacity battery 1 in the first row of large-capacity batteries, at least one large-capacity battery 1 in the second row of large-capacity batteries and at least one large-capacity battery 1 in the third row of large-capacity batteries form a battery module unit 100. The liquid cooling devices of all large-capacity batteries 1 in this battery module unit 100 are connected in series, so that this battery module unit 100 has an inlet 101 and an outlet 102; the inlet 101 of this battery module unit 100 is connected to the liquid inlet pipeline 3, and the outlet 102 is connected to the liquid return pipeline 4.

[0066] When the battery cluster includes 4 rows of high-capacity batteries, at least one high-capacity battery 1 in the first row of high-capacity batteries to at least one high-capacity battery 1 in the 4th row of high-capacity batteries form a battery module unit. The 4 rows of high-capacity batteries can form multiple battery module units 100. That is to say, at least one high-capacity battery 1 in the first row of high-capacity batteries, at least one high-capacity battery 1 in the second row of high-capacity batteries, at least one high-capacity battery 1 in the third row of high-capacity batteries, and at least one high-capacity battery 1 in the fourth row of high-capacity batteries form a battery module unit 100. The liquid cooling devices of all the high-capacity batteries 1 in the battery module unit 100 are connected in series so that the battery module unit 100 has an inlet 101 and an outlet 102; the inlet 101 of the battery module unit 100 is connected to the inlet pipeline 3, and the outlet 102 is connected to the return pipeline 4.

[0067] The above-mentioned high-capacity battery 1 can be a single cell, a PACK, or a high-capacity battery. Specifically, the high-capacity battery is the high-capacity battery disclosed in Chinese patents CN117477186A, CN117477063A, and CN115275453A; such high-capacity batteries all include multiple single cells, and the inner cavities of the single cells are connected to at least one shared chamber. The shared chamber of this type of high-capacity battery is realized through at least one hollow member, and the hollow member can be composed of a hollow box body with one end open and a cover plate for covering the opening; the hollow box body is fixed on the upper cover plate, lower cover plate or cylinder of each single cell, and the inner cavities of the single cells communicate with the inner cavity of the hollow member so that each single cell is in the same electrolyte system and gas balance system.

[0068] As Figure 5 and Figure 6 As shown, the high-capacity battery 1 in this embodiment includes a housing 11 and multiple single cells 12, and the multiple single cells 12 are arranged in the same direction and placed in the housing 11. The housing 11 is provided with a shared chamber, and the inner cavity of the shared chamber communicates with the inner cavities of all the single cells 12. The single cells 12 in this embodiment are square shell batteries, and the number can be adjusted according to actual needs. The inner cavity of each single cell 12 includes an electrolyte area and a gas area.

[0069] As Figure 6As shown, after multiple single cells 12 are arranged in the same direction and placed in the housing 11, relief holes are provided on the top plate of the housing 11 corresponding to the polarity terminals 13 of each single cell 12. The polarity terminals 13 of each single cell 12 extend out of the corresponding relief holes to serve as the polarity terminals of the large-capacity battery 1 (the polarity terminals of all the single cells 12 on one side serve as the positive polarity terminals of the large-capacity battery 1, and the polarity terminals of all the single cells 12 on the other side serve as the negative polarity terminals of the large-capacity battery 1). The area of the top plate of the housing 11 corresponding to the relief holes is fixedly sealed with the housing of the single cell 12, so that the gap between the polarity terminal 13 and the relief hole is sealed.

[0070] It should be noted that the polarity terminal 13 of the single cell 12 here can be the pole column of the single cell 12. If it is to prevent the pole column of the single cell 12 from not being able to smoothly extend out of the relief hole as the polarity terminal 13, a pole column adapter can also be connected to the pole column of the single cell 12, and the overall structure formed by the cooperation of the pole column of the single cell 12 and the pole column adapter is used as the polarity terminal 13 of the single cell 12.

[0071] The shared chamber in the housing 11 above can be an electrolyte shared chamber 111. The electrolyte shared chamber 111 is a liquid channel provided on the bottom plate of the housing 11. The inner cavity of the electrolyte shared chamber 111 is communicated with the electrolyte areas in the inner cavities of all the single cells 12. Through the electrolyte shared chamber 111, each single cell 12 can be in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell 12 and improving the performance and charge-discharge cycle life of the large-capacity battery 1.

[0072] The shared chamber in the housing 11 above can be a gas shared chamber 112. The gas shared chamber 112 is a gas channel provided on the top plate of the housing 11. The inner cavity of the gas shared chamber 112 is communicated with the gas areas in the inner cavities of all the single cells 12. Through the gas shared chamber 112, the gas balance of each single cell 12 is achieved, and the performance and charge-discharge cycle life of the large-capacity battery 1 can also be improved.

[0073] The shared chamber above can be a gas-liquid shared chamber. The inner cavity of the gas-liquid shared chamber is communicated with both the electrolyte area and the gas area in the inner cavities of all the single cells 12. Through one gas-liquid shared chamber, each single cell 12 can be in a unified electrolyte environment and gas environment, improving the performance and charge-discharge cycle life of the large-capacity battery 1. Specifically, when setting, a protrusion extending along the arrangement direction of the single cells 12 is provided on the side wall of the housing 11, and a gas-liquid shared chamber is formed at the protrusion part, and the gas-liquid shared chamber is communicated with both the electrolyte area and the gas area of each single cell 12.

[0074] The above-mentioned shared chamber may also include an electrolyte shared chamber 111 and a gas shared chamber 112 at the same time. The inner cavity of the electrolyte shared chamber 111 communicates with the electrolyte regions in the inner cavities of all the single cells 12, and the inner cavity of the gas shared chamber 112 communicates with the gas regions in the inner cavities of all the single cells 12. Placing a plurality of single cells 12 inside a housing 11 having an electrolyte shared chamber 111 and a gas shared chamber 112 enables the sharing of electrolyte and gas among the single cells 12 to ensure the consistency of each single cell 12, so that the electrolytes and gases of all the single cells 12 are in the same system, reducing the differences among the single cells 12, improving the consistency among the single cells 12 to a certain extent, and thus improving the cycle life of the large-capacity battery 1 to a certain extent.

[0075] The above-mentioned shared chamber may also include an electrolyte shared chamber 111 and a gas shared chamber 112 at the same time. The inner cavity of the electrolyte shared chamber 111 communicates with the electrolyte regions in the inner cavities of all the single cells 12, and the gas shared chamber 112 is a gas passage located between the top plate of the housing 11 and each single cell 12. This gas passage covers the explosion vent part (specifically, an explosion vent film) of each single cell 12. When the explosion vent part of any single cell 12 is broken through by the hot runaway flue gas in the inner cavity, the gas region in the inner cavity of this single cell 12 communicates with the gas passage. At this time, the gas shared chamber 112 is used as an explosion vent passage. That is, during the normal operation of the large-capacity battery 1, the inner cavities of the individual single cells 12 do not communicate with the gas passage. When any single cell 12 undergoes thermal runaway, when the explosion vent part at the top of this single cell 12 is opened by the flue gas in the inner cavity, the inner cavity of this single cell 12 communicates with the gas passage, and the hot runaway flue gas is discharged through the gas passage, improving the safety of the large-capacity battery 1.

[0076] As Figure 3 and Figure 5 As shown, an explosion vent component 14 communicating with the shared chamber is provided on the above-mentioned housing 11; the explosion vent component 14 is connected to a flue gas manifold 6. The flue gas manifold 6 includes a plurality of flue gas pipelines 61 and a union tee 62. The plurality of flue gas pipelines 61 are connected in series through the union tee 62, and one port of each union tee 62 is used to connect to an explosion vent component 14 on a large-capacity battery 1. The above-mentioned flue gas pipelines 61 generally use flexible hoses, and heat-resistant metal hoses need to be selected to meet the requirements for the discharge of hot runaway flue gas. After the explosion vent component 14 is connected to the flue gas manifold 6, the hot runaway flue gases of all the large-capacity batteries 1 are collected by the flue gas manifold 6. When thermal runaway occurs in the single cells 12 in any large-capacity battery 1, its hot runaway flue gas can be discharged through the flue gas manifold 6, reducing the spread of thermal runaway and preventing the hot runaway flue gas of an individual large-capacity battery 1 from spreading to the entire battery cluster and causing safety problems.

[0077] The above-mentioned large-capacity battery is provided with a liquid cooling device, which can be a liquid cooling plate arranged at the bottom or side wall of the housing, or a heat transfer pipe arranged at the bottom or side wall of the housing.

[0078] As Figure 5 and Figure 6 shown, the liquid cooling device in this embodiment is a heat transfer pipe 2 arranged on the polar terminals 13 of each single battery 12. A clamping part 131 is provided at the part where the polar terminals 13 of each single battery 12 extend out of the avoidance hole; the heat transfer pipe 2 is fixed on the clamping part 131 of the polar terminals 13 of each single battery 12, and the heat transfer pipe 2 is insulated from each single battery 12. Installing the heat transfer pipe 2 on the polar terminals of the large-capacity battery 1 is mainly used to control the temperature at the top of the large-capacity battery 1, especially at the polar terminal part of the large-capacity battery 1, to ensure that the large-capacity battery 1 operates within the optimal temperature range. When the temperature of the large-capacity battery 1 is higher than the set threshold, by introducing a liquid cooling medium with a lower temperature into the heat transfer pipe 2, the heat on the polar terminal 13 where the heat is relatively concentrated is timely conducted out, improving the heat dissipation effect at the top of the large-capacity battery 1. In addition, when the temperature of the large-capacity battery 1 is lower than the set threshold, by introducing a liquid cooling medium with a higher temperature into the heat transfer pipe 2, the large-capacity battery 1 is heated; by controlling the temperature of the liquid cooling medium, it can be ensured that the large-capacity battery 1 always operates at the normal working temperature.

[0079] As Figure 5 shown, the above-mentioned heat transfer pipe 2 is a pipe with a heat exchange function. There is no requirement for the cross-sectional shape of the heat transfer pipe 2, as long as it can contact the polar terminal 13 of the single battery 12 for heat exchange. For example, square pipes, elliptical pipes, circular pipes, etc. can be used. In this embodiment, the heat transfer pipe 2 is preferably a circular pipe, which is convenient for installation and can be made of existing metal pipes, with relatively low cost.

[0080] The heat transfer pipe 2 in this embodiment is specifically made of a metal pipe with good thermal conductivity, such as an aluminum pipe, a copper pipe, etc. Preferably, the above-mentioned heat transfer pipe 2 uses an aluminum pipe with better heat conduction effect and relatively low cost. To ensure the heat conduction effect, the thinner the wall thickness of the aluminum pipe, the better. However, if the wall thickness of the aluminum pipe is too thin, the aluminum pipe is relatively soft and is easily bent and damaged during installation. Therefore, in this embodiment, the wall thickness of the aluminum pipe is required to maintain its installation reliability while having good thermal conductivity.

[0081] The above-mentioned heat transfer pipe 2 can be specifically made by adopting the following structure:

[0082] First, the heat transfer pipe 2 can be made of a whole pipe. The entire aluminum pipe is bent into a U-shaped pipe, and the two straight pipes of the U-shaped pipe are respectively fixed on the positive and negative polar terminals of each single battery 12 in the large-capacity battery 1;

[0083] Second, as Figure 5As shown, the heat transfer tube 2 is a spliced pipeline, mainly including a first tube 21, a second tube 22 and a connecting tube 23; the first tube 21 is fixed on the clamping part 131 of the positive terminals of each single battery 12 in the large-capacity battery 1; the second tube 22 is fixed on the clamping part 131 of the negative terminals of each single battery 12 in the large-capacity battery 1, and both ends of the connecting tube 23 are connected to the ports on the same side of the first tube 21 and the second tube 22 respectively.

[0084] For the convenience of installation, the heat transfer tube 2 is preferably a spliced pipeline of the second type. At the same time, the connecting tube 23 of the above spliced heat transfer tube can be made of a flexible tube. After the first tube 21 and the second tube 22 are connected by a flexible tube, it is convenient to separately install the first tube 21 and the second tube 22 on the polarity terminals of the large-capacity battery 1, improving the installability of the heat transfer tube 2 on the large-capacity battery 1. At the same time, the flexible tube is an insulating flexible tube, improving the insulation between the large-capacity battery 1 and the heat transfer tube 2. During specific connection, the insulating flexible tube and the first tube 21 and the second tube 22 are fixedly connected by a clamp.

[0085] When the above heat transfer tube 2 cooperates with the polarity terminals of the large-capacity battery 1, for the sake of safety, insulation is required between the heat transfer tube 2 and the large-capacity battery 1. Specifically, the polarity terminals can be insulated, an insulating and heat-conducting member can be arranged between the polarity terminals and the heat transfer tube 2, the heat transfer tube 2 can be insulated, etc.

[0086] In this embodiment, the method of insulating the heat transfer tube 2 is preferably adopted. At this time, the following methods can be used to achieve this insulation treatment: the heat transfer tube 2 is an insulating pipeline made of an insulating material, for example, a plastic tube or a ceramic tube, etc. However, for a metal tube, the heat conductivity of a plastic tube or a ceramic tube is relatively poor. Therefore, on the basis of considering the heat exchange effect, an insulating layer or an insulating sleeve is provided on the above metal tube to ensure the insulation between the metal tube and the large-capacity battery 1 during use. The above insulating layer is specifically a ceramic coating, an enamel coating, an insulating paint layer, a hard anodized layer, etc. provided on the wall of the heat transfer tube 2; the insulating sleeve is a heat-conducting plastic sleeve or a heat-conducting rubber sleeve, etc. with better insulating performance and heat-conducting performance.

[0087] Preferably, an insulating layer and an insulating sleeve are simultaneously provided on the heat transfer tube 2 to form a double-insulation structure; this kind of double-insulation setting enables the heat transfer tube 2 and the large-capacity battery 1 to maintain reliable insulation performance even if one of the insulating layer or the insulating sleeve is damaged during heat exchange, thereby improving the safety of the large-capacity battery 1 during use.

[0088] Such as Figure 6As shown, when the above-mentioned heat transfer tube 2 is specifically installed, a through groove or through hole is opened at the part where the polar terminal 13 of the single battery 12 extends out of the avoidance hole as the clamping part 131. Compared with the through hole, the through groove is more convenient for on-site installation and has relatively low requirements for installation. With the above-mentioned through groove provided, the cross-section of the through groove is C-shaped. For a through groove with a C-shaped cross-section, the opening width is smaller than the widest part of the through groove. Such a design is conducive to the interference fit of the heat transfer tube 2 in the through groove. The arcs formed at both ends of the C-shaped through groove have natural tension, which is conducive to tightly clamping the heat transfer tube 2 in the through groove.

[0089] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, the above-mentioned large-capacity battery 1 equipped with the heat transfer tube 2 forms a battery cluster. The battery cluster includes two rows of large-capacity batteries 1, and the number of large-capacity batteries 1 in each row is multiple. Among them, at least one large-capacity battery 1 in the first row of large-capacity batteries 1 and at least one large-capacity battery 1 in the second row of large-capacity batteries 1 form a battery module unit 100. All the large-capacity batteries 1 in the entire battery cluster can form multiple battery module units 100. The number of battery module units 100 and the number of large-capacity batteries in each battery module unit 100 can be set accordingly according to requirements. For example, if each row includes 26 large-capacity batteries and the entire battery cluster includes 52 large-capacity batteries, then as Figure 1 and Figure 2 shown, 4 large-capacity batteries 1 form a battery module unit 100, and 52 large-capacity batteries form 13 battery module units 100; it can also be as Figure 3 and Figure 4 shown, 52 large-capacity batteries altogether form 8 battery module units 100. Among them, 4 battery module units 100 each include 7 large-capacity batteries, and the remaining 4 battery module units 100 each include 6 large-capacity batteries; Figure 3 and Figure 4 only show the structure where 7 large-capacity batteries form a battery module unit 100.

[0090] As Figure 4 shown, in each battery module unit 100, the heat transfer tubes 2 of the large-capacity batteries 1 each have a liquid inlet port and a liquid outlet port. The heat transfer tubes 2 of the large-capacity batteries 1 are connected in series through the intermediate pipeline 9. After the series connection is completed, the liquid inlet port of one large-capacity battery 1 and the liquid outlet port of another large-capacity battery 1 are vacant ports. At this time, these two vacant ports are used as the liquid inlet 101 and the liquid outlet 102 of the battery module unit 100; the liquid inlet 101 of the battery module unit 100 is connected to the liquid inlet pipeline 3, and the liquid outlet 102 is connected to the liquid return pipeline 4.

[0091] After connecting the liquid inlet 101 of the battery module unit 100 to the liquid inlet pipeline 3 and the liquid outlet 102 to the liquid return pipeline 4, the liquid inlet pipeline 3 diverts the liquid cooling medium to each battery module unit 100. In each battery module unit 100, the liquid cooling medium sequentially passes through the heat transfer tubes 2 on each large-capacity battery 1, and the heat transfer tubes 2 exchange heat with the polarity terminals of each large-capacity battery 1. After the liquid cooling medium exchanges heat, it returns to the liquid return pipeline 4 through the liquid outlet 102, and the liquid return pipeline 4 is used to converge the liquid cooling medium that has exchanged heat with each battery module unit 100.

[0092] After the above-mentioned battery module unit 100 is connected to the liquid inlet pipeline 3 and the liquid return pipeline 4, the liquid inlet pipeline 3 diverts the liquid cooling medium to each battery module unit 100, and the liquid cooling medium diverted to each battery module unit 100 exchanges heat with the heat transfer tube 2 in the battery module unit 100 in turn. At this time, if the number of large-capacity batteries 1 in each battery module unit 100 is different, the heat exchange amount between each battery module unit 100 and the liquid cooling medium is different, resulting in a temperature difference between each battery module unit 100. Therefore, preferably, the number of large-capacity batteries 1 in each battery module unit 100 is the same. More preferably, in each battery module unit 100, the number of large-capacity batteries 1 in the first row is the same as the number of large-capacity batteries 1 in the second row. This setting makes the heat exchange amount between each battery module unit 100 and the liquid cooling medium as consistent as possible, the temperature difference between each battery module unit 100 as small as possible, realizes more uniform heat exchange for each battery module unit 100, balances the temperature difference between each battery module unit 100, and improves the safety of the battery cluster.

[0093] The liquid inlet pipeline 3 and the liquid return pipeline 4 in this embodiment may specifically adopt the following structures:

[0094] First, both the liquid inlet pipeline 3 and the liquid return pipeline 4 are made of a single integral pipe, and multiple branch pipelines 10 connected to the liquid inlets 101 and liquid outlets 102 of each battery module unit 100 are provided thereon;

[0095] Second, as shown in Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the liquid inlet pipeline 3 is mainly composed of multiple liquid inlet pipe segments 31 spliced together, the liquid return pipeline 4 is mainly composed of multiple liquid return pipe segments 41 spliced together, the number of liquid inlet pipe segments 31 and liquid return pipe segments 41 is the same as the number of battery module units 100, a branch pipeline 10 is provided on each liquid inlet pipe segment 31 and each liquid return pipe segment 41, and the liquid inlets 101 of each battery module unit 100 are connected to the branch pipelines 10 on each liquid inlet pipe segment 31 in a one-to-one correspondence, and the liquid outlets 102 of each battery module unit 100 are connected to the branch pipelines 10 on each liquid return pipe segment 41 in a one-to-one correspondence.

[0096] In the above two structures, when the whole tube is used to make the liquid inlet pipeline 3 and the liquid return pipeline 4, the installation difficulty of each pipeline is relatively large, and the installation positions of each pipeline need to be accurately ensured to avoid installation errors. At the same time, during on-site maintenance, it is necessary to disassemble the entire liquid inlet pipeline 3 and the liquid return pipeline 4 to carry out maintenance on the related large-capacity battery 1, the liquid inlet pipeline 3 and the liquid return pipeline 4, which is time-consuming and laborious, and the installation and maintenance are very inconvenient. Therefore, it is a preferred solution that both the liquid inlet pipeline 3 and the liquid return pipeline 4 are spliced pipelines. Each battery module unit 100 is assembled with the corresponding liquid inlet pipe section 31 and the liquid return pipe section 41. This kind of spliced pipeline reduces the error and assembly difficulty when connecting the liquid inlet pipeline 3 and the liquid return pipeline 4. At the same time, during subsequent maintenance of this kind of spliced pipeline, only the liquid inlet pipe section 31 and the liquid return pipe section 41 of the related battery module unit 100 need to be removed for maintenance, without removing the entire liquid inlet pipeline 3 and the liquid return pipeline 4, greatly improving the convenience of installation, disassembly and maintenance.

[0097] As Figure 2 , Figure 3 and Figure 4 shown, during specific connection, the liquid inlet ports 101 of each battery module unit 100 are respectively connected to the branch pipelines 10 of each liquid inlet pipe section 31 through quick connectors 5 in a one-to-one correspondence, and the liquid outlet ports 102 of each battery module unit 100 are respectively connected to the branch pipelines 10 of each liquid return pipe section 41 through quick connectors 5 in a one-to-one correspondence. The quick connectors 5 are convenient to install and can be directly plugged and unplugged without tools. When adjusting and maintaining the liquid inlet pipeline 3 and the liquid return pipeline 4 on-site, the purpose of quick installation and disassembly is achieved. At the same time, the maintenance cost is reduced, and the convenience of installation or disassembly is improved. In addition, the above quick connectors 5 can also have a two-way self-sealing function. During the process of plugging and unplugging the quick connectors 5, the automatic cut-off of the liquid flow can be realized, so that when maintaining the large-capacity battery 1, the liquid inlet pipeline 3 and the liquid return pipeline 4, it is not necessary to empty the liquid cooling medium in each pipeline, improving the convenience of maintenance.

[0098] In addition, in this embodiment, a heat insulation layer can also be coated on the above liquid inlet pipeline 3 and the liquid return pipeline 4. The heat insulation layer can not only effectively prevent the loss of the cold or heat of the liquid cooling medium, reduce energy consumption, but also avoid the condensation phenomenon on the pipe walls of each pipeline.

[0099] Embodiment 2

[0100] The battery cluster in this embodiment is similar in structure to the battery cluster in Embodiment 1. The difference from Embodiment 1 is that the large-capacity battery 1 in this embodiment is slightly different from the large-capacity battery 1 in Embodiment 1.

[0101] During the long-term use of the large-capacity battery 1, due to the temperature difference between the inside and outside of the heat transfer tube 2, condensation will occur on the surface. When the condensation accumulates to a certain amount, it will penetrate into the gap between the polar terminal 13 of the single battery 12 and the avoidance hole, resulting in electrical conduction between the polar terminal 13 of the single battery 12 and the outer shell 11, and further may lead to the short circuit of the same single battery 12.

[0102] As Figure 7 and Figure 8 shown, in this embodiment, by optimizing the top structure of the large-capacity battery 1, an insulating and sealing adhesive layer 15 is laid on the top plate of the outer shell 11 to overcome the above problems. The end faces of the polar terminals 13 of each single battery 12 protrude from the insulating and sealing adhesive layer 15 for connection with the first electrical connector or the second electrical connector; the liquid inlet port and the liquid outlet port of the heat transfer tube 2 protrude from the insulating and sealing adhesive layer 15. The first electrical connector is a connecting device for realizing the parallel connection of each single battery 12, and the second electrical connector is a connecting device for realizing the series connection of two large-capacity batteries 1, or can also be a connecting device for connecting the large-capacity battery 1 with an external load.

[0103] In this embodiment, an insulating and sealing adhesive layer 15 is laid on the top plate of the outer shell 11. Part of the area of the polar terminal 13 of each single battery 12 is covered by the insulating and sealing adhesive layer 15, and the end face of the polar terminal 13 of each single battery 12 protrudes from the insulating and sealing adhesive layer 15 and is connected with the first electrical connector and / or the second electrical connector; the main body part of the heat transfer tube 2 is covered by the insulating and sealing adhesive layer 15, and the liquid inlet end and the liquid outlet end of the heat transfer tube 2 protrude from the insulating and sealing adhesive layer 15 for connection with the liquid inlet manifold and the liquid return manifold.

[0104] In some other embodiments, the thickness of the insulating and sealing adhesive layer 15 can be smaller, lower than the main body part of the heat transfer tube 2, or only cover a part of the main body part of the heat transfer tube 2, as long as it is ensured that the condensation cannot enter the gap between the polar terminal 13 of the single battery 12 and the avoidance hole. The insulating and sealing adhesive generally used in this embodiment is the commonly used battery potting adhesive for batteries, such as silicone thermal conductive potting adhesive, which has good functions of sealing, insulation, vibration resistance, heat dissipation and waterproofing.

[0105] On the basis of the above structure, in this embodiment, an insulating protective cover 16 is further provided on the top of the large-capacity battery 1, so as to provide insulation protection for the polar terminal 13, avoid potential safety hazards that may exist when the polar terminal 13 is exposed during the operation of the large-capacity battery 1, and also avoid the problem that some foreign objects in the external environment fall into the position of the polar terminal 13 and cause the short circuit of the large-capacity battery 1, improving the safety of the large-capacity battery 1.

[0106] It should be noted that if the insulating protective cover 16 wraps all the polar terminals 13, it will make the electrical connection of such large-capacity batteries 1 difficult. Therefore, in this embodiment, a slit is provided on the side wall of the insulating protective cover 16, through which the second electrical connector can be connected to the polar terminal 13 of the single battery 12, thereby realizing the electrical connection. It should also be noted that channels for the liquid inlet port and the liquid outlet port of the heat transfer tube 2 to extend out need to be provided on the side wall of the insulating protective cover 16.

[0107] Embodiment 3

[0108] As Figures 9 to 12 shown, the battery cluster in this embodiment is similar in structure to the battery clusters in Embodiment 1 and Embodiment 2. The difference is that the battery cluster in this embodiment further includes a support frame 8, and the large-capacity batteries 1 of multiple battery module units 100 are all placed on this one support frame 8. The support frame 8 includes a first support frame 81 and a second support frame 82. The first row of large-capacity batteries 1 is arranged on the first support frame 81, and the second row of large-capacity batteries 1 is arranged on the second support frame 82. The above-mentioned first support frame 81 and second support frame 82 have the same structure and are mainly composed of two first support beams 811 and two second support beams 812 connected. At the same time, the first support frame 81 and the second support frame 82 are assembled into a frame body through a vertical connecting beam 83 in the vertical direction, and at least one sliding roller 84 is provided at the bottom of the second support frame 82.

[0109] In this embodiment, multiple battery module units 100 are placed on one support frame 8. This kind of integrated frame body has high stability and can support the two rows of large-capacity batteries 1 more firmly.

[0110] As Figure 12 shown, in order to enable the support frame 8 with the battery cluster installed to be easily installed in place or disassembled for maintenance, the support frame 8 is generally installed in a sliding manner with the battery rack in the energy storage device. At this time, at least one sliding roller 84 is installed at the bottom of the second support frame 82, and the battery module unit 100 can be easily installed in place through the sliding roller 84. Specifically, when setting, the sliding roller 84 can be set on the second support beam 812. The second support beam 812 can be made of square steel pipe. A plurality of through grooves are provided at the bottom of the square steel pipe. The sliding roller 84 is installed inside the square steel pipe, and its bottom extends out of the through groove on the square steel pipe, so as to be able to slide on the battery rack in the energy storage device. After being installed in place, the support frame 8 can be fixed on the battery rack by using a limiting member.

[0111] As Figure 13 and Figure 14 shown, when placing the large-capacity battery 1 on the support frame 8, specifically, a bracket is added at the bottom of each large-capacity battery; each large-capacity battery 1 is fixed on the support frame 8 through its respective bracket 7, as Figure 15As shown in the figure, the bracket 7 includes a support member 71 and two L-shaped brackets 72; the support member 71 is placed at the bottom of the large-capacity battery 1 to support the large-capacity battery 1; one end of each of the two L-shaped brackets 72 is fixed to both ends of the support member 71 respectively, and the other end of each of the two L-shaped brackets 72 is respectively used to be fixed to the second support beam 812 of the support frame 8. The above support member 71 is a support plate adapted to the shape of the bottom of the large-capacity battery 1 to support the large-capacity battery 1. In order to reduce the weight of the support plate, weight-reducing holes can be opened on the support plate. However, it should be noted that the opening of the weight-reducing holes is based on the premise of not affecting the support strength.

[0112] In order to improve the stability of the large-capacity battery 1 on the bracket 7, in this embodiment, threaded holes are also opened on the L-shaped bracket 72, and the L-shaped bracket 72 is fixedly connected to the large-capacity battery 1 by means of screw fastening. During assembly, the large-capacity battery 1 is placed on the support member 71. In order to insulate between the bracket 7 and the large-capacity battery 1, an insulating gasket can also be provided between the support member 71 and the large-capacity battery 1, and then the bracket 7 and the outer shell 11 of the large-capacity battery 1 can be fixed by screws.

[0113] In addition, after placing a plurality of battery module units 100 on the support frame 8, the liquid inlet pipeline 3 can be embedded and installed in the first support frame 81, and the liquid return pipeline 4 can be embedded and installed in the second support frame 82. This installation method can isolate the large-capacity battery 1 from the liquid inlet pipeline 3 and the liquid return pipeline 4, avoiding the influence on the large-capacity battery 1 caused by leakage at the pipeline joints. At the same time, the embedded installation also improves the integration degree of the entire battery cluster.

[0114] Embodiment 4

[0115] As Figure 16 and Figure 17 shown, the battery cluster in this embodiment is similar in structure to the battery clusters in Embodiment 1 and Embodiment 2. The difference is that in the battery cluster in this embodiment, the battery cluster in this embodiment further includes a plurality of support frames 8, and the number of support frames 8 is the same as the number of battery module units 100. The large-capacity battery 1 of one battery module unit 100 is placed on one support frame 8, and the structure of this support frame 8 is the same as the structure of the support frame in Embodiment 3, except that the length of the support frame 8 is different.

[0116] In this embodiment, there are a plurality of support frames 8, and each battery module unit 100 is placed on the corresponding support frame 8. This installation method enables the entire battery cluster to have a wider range of use and can assemble the large-capacity batteries in the battery cluster in a smaller installation space; at the same time, in later maintenance, only some battery module units 100 need to be removed from the battery rack to achieve maintenance, without removing all the battery module units 100, and the maintenance is relatively convenient.

[0117] It should be noted that in this embodiment, the battery module units 100 are arranged on their respective support frames 8. At this time, the liquid inlet pipelines 3 and the liquid return pipelines 4 in each battery module unit 100 both adopt spliced pipelines. After each battery module unit 100 is installed on the battery rack of the energy storage box through its respective support frame 8, the liquid inlet pipe segments 31 and the liquid return pipe segments 41 of adjacent battery module units 100 are then connected to splice and form the liquid inlet pipeline 3 and the liquid return pipeline 4. At the same time, the flue gas pipelines 61 of adjacent battery module units 100 are also connected to form the flue gas manifold 6.

[0118] In addition, after multiple battery module units 100 are placed on the battery rack through their respective support frames 8, corresponding electrical connections are made to the large-capacity batteries in adjacent battery module units 100.

[0119] Embodiment 5

[0120] This embodiment provides an energy storage device, which includes an energy storage box and a plurality of battery clusters in Embodiment 1, Embodiment 2, Embodiment 3 or Embodiment 4 arranged in the energy storage box; a battery rack is provided in the energy storage box, and in the height direction of the large-capacity battery 1, a plurality of battery clusters are stacked on the battery rack.

Claims

1. A battery cluster, characterized in that: It includes N rows of large-capacity batteries, a liquid inlet pipeline, and a liquid return pipeline, wherein N is an integer greater than or equal to 2; Liquid cooling devices are installed on large capacity batteries; At least one large-capacity battery in the first row of large-capacity batteries, through at least one large-capacity battery in the Nth row of large-capacity batteries, form a battery module unit; The liquid cooling devices of all large-capacity batteries in each battery module unit are connected in series. After the series connection, each battery module unit has a liquid inlet and a liquid outlet; The liquid inlet of each battery module unit is connected to the liquid inlet pipeline, and the liquid outlet is connected to the liquid return pipeline.

2. The battery cluster according to claim 1, characterized in that: The number of large-capacity batteries in each battery module unit is the same, and the number of large-capacity batteries in each row in each battery module unit is the same.

3. The battery cluster according to claim 1, characterized in that: The liquid inlet pipeline is mainly composed of a plurality of liquid inlet pipe sections, and the liquid return pipeline is mainly composed of a plurality of liquid return pipe sections, and the number of the liquid inlet pipe sections and the liquid return pipe sections is the same as the number of the battery module units; The liquid inlet of each battery module unit is connected to the branch pipeline of each liquid inlet pipe section through a quick-plug connector, and the liquid outlet of each battery module unit is connected to the branch pipeline of each liquid return pipe section through a quick-plug connector.

4. The battery cluster according to claim 1, characterized in that , and also includes a support frame, on which the large-capacity batteries of multiple battery module units are placed; the support frame includes N support frames arranged in sequence from top to bottom, and a bracket is provided at the bottom of each large-capacity battery; each row of large-capacity batteries is arranged on a support frame through a bracket, and adjacent support frames are connected into a frame body through vertical connecting beams, and the bottom of the Nth support frame has at least one sliding roller.

5. The battery cluster according to claim 1, characterized in that: It also includes a plurality of support racks, the number of the support racks is the same as the number of the battery module units, a large-capacity battery of a battery module unit is placed on one support rack, and the support rack includes N support frames arranged in sequence from top to bottom; In each battery module unit, a bracket is provided at the bottom of each large-capacity battery, each row of large-capacity batteries is arranged on a support frame through the bracket, and adjacent support frames are connected into a frame body through vertical connecting beams, and the bottom of the Nth support frame has at least one sliding roller.

6. The battery cluster according to claim 4 or 5, characterized in that: The liquid inlet pipeline and the liquid return pipeline are both embedded and installed in the supporting frame.

7. The battery cluster according to any one of claims 1 to 5, characterized in that: The large-capacity battery comprises an outer shell and a plurality of single cells arranged in the outer shell in the same direction; a shared chamber is arranged in the outer shell, and the inner cavity of the shared chamber is connected with the inner cavities of all the single cells; avoidance holes are opened on the top plate of the outer 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 outer shell corresponding to the avoidance holes is fixedly sealed with the shell of the single cell.

8. The battery cluster according to claim 7, characterized in that: The liquid cooling device comprises a heat transfer tube, and a clamping portion is provided at the position where each single battery polarity terminal extends out of the avoidance hole; the heat transfer tube is fixed on the clamping portion of each single battery polarity terminal, and the heat transfer tube is insulated from each single battery.

9. The battery cluster according to claim 8, characterized in that: An insulating sealant layer is laid on the top plate of the shell, and the liquid inlet and outlet ports of the heat transfer tube extend out of the insulating sealant layer; at the same time, an insulating protective cover is arranged on the top of the shell, and the polarity terminals of each single battery are located in the insulating protective cover.

10. The battery cluster according to claim 7, characterized in that: It also includes a smoke manifold, which includes multiple smoke pipelines and flexible tees. The multiple smoke pipelines are connected in series through the flexible tees, and one port in each flexible tee is used to connect to an explosion relief component on a large-capacity battery, and the explosion relief component is connected to a shared chamber in the shell.

11. An energy storage device, characterized in that: It comprises an energy storage box and a plurality of battery clusters as claimed in any one of claims 1 to 10; the plurality of battery clusters are arranged from top to bottom, and the battery module units are arranged on a battery rack in the energy storage box through a support frame.

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