A battery cluster and energy storage device

Abstract

The utility model provides a kind of battery cluster and energy storage equipment, mainly solve the conductivity and heat dissipation problem existing when large current transmission in existing energy storage equipment.The battery cluster, first electric connection unit is arranged between adjacent battery component unit;First electric connection unit includes first confluence pressure plate, first insulating support seat and two groups of first electric connection component;Each group of first electric connection component includes multiple L-shaped electric connection plate, the transverse plate of each L-shaped electric connection plate is electrically connected with the outermost battery component in battery component unit, and the vertical plate of two groups of L-shaped electric connection plate is connected one by one;First confluence pressure plate is fixed clamped with the vertical plate of multiple L-shaped electric connection plate.This kind of electric connection mode meets the requirement of large current transmission while having good heat dissipation performance.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, specifically relating to a battery cluster and energy storage device. Background Technology

[0002] Current lithium battery technology is mainly used in electric vehicles as a power source, and also in power plants as an energy storage device for storing and releasing electrical energy.

[0003] Existing energy storage devices require large charge / discharge capacities. This necessitates connecting multiple individual cells to form battery modules, then connecting these modules to form battery cell units, then connecting these cell units to form a battery cluster, and finally connecting these clusters to create an energy storage device with a large charge / discharge capacity. When the current flowing between battery cell units and between battery clusters is significant, how to rationally design the electrical connection units to ensure good conductivity and heat dissipation is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] This utility model provides a battery cluster and energy storage device, which mainly solves the problems of conductivity and heat dissipation in existing energy storage devices when transmitting high current.

[0005] To solve the above problems, this utility model provides the following technical solution:

[0006] The battery cluster provided by this utility model includes multiple battery component units arranged along the z-direction; each battery component unit includes N battery components arranged along the y-direction, and each battery component includes multiple single cells arranged along the x-direction, where N is an integer greater than or equal to 1; a first electrical connection unit is provided between adjacent battery component units, thereby realizing the series connection of each battery component unit in the battery cluster; the first electrical connection unit includes a first busbar, a first insulating support base, and two sets of first electrical connection assemblies arranged along the z-direction; each set of first electrical connection assemblies includes Multiple first electrical connection plates are arranged along the x-direction. The first electrical connection plates are L-shaped. The horizontal plates of each L-shaped electrical connection plate are electrically connected to the outermost battery component in the battery component unit. The vertical plates of two sets of L-shaped electrical connection plates are connected one-to-one and at least partially overlap. There are two first busbar plates, located on both sides of the overlapping part of the vertical plates, which fix and clamp the vertical plates of the multiple L-shaped electrical connection plates. There are two first insulating support seats, located at both ends of the first busbar plates, which are used to install the two first busbar plates on the mounting platform of the battery component unit.

[0007] Furthermore, the multiple individual cells of the battery component are connected in parallel through an electrical busbar, and the horizontal plates of each L-shaped electrical connection plate are connected to the electrical busbar.

[0008] Furthermore, after the vertical plates of the two sets of L-shaped electrical connection plates are connected one-to-one, the overlapping part has the same dimension in the z direction as the first busbar pressure plate in the z direction, and the non-electrical connection part of the vertical plate is covered with a heat-shrinkable insulating sleeve.

[0009] Furthermore, the L-shaped electrical connection plate is composed of multiple layers of pressed aluminum sheets, with the first busbar plate being an aluminum plate.

[0010] Furthermore, a nut is integrally provided on the side of the first busbar plate near the battery component, and the two first busbar plates and the vertical plate of the L-shaped electrical connection plate are fixedly connected by screws.

[0011] Furthermore, the first insulating support includes a mounting part and a support part. The support part is used to connect with the mounting platform of the battery component unit, and the mounting part is provided with a blind groove for insertion and engagement with the first busbar plate.

[0012] Furthermore, the battery component includes a housing and multiple individual batteries arranged in the same direction within the housing; the housing has a shared chamber, the inner cavity of which is connected to the inner cavities of all individual batteries; the top plate of the housing has clearance holes corresponding to the polarity terminals of each individual battery; the polarity terminals of each individual battery extend out of the clearance holes, and the area of ​​the top plate of the housing corresponding to the clearance holes is fixedly sealed to the housing of the individual batteries.

[0013] Furthermore, a heat transfer tube is connected to the portion of the polar terminal of each individual battery that extends out of the outer casing, and the heat transfer tube exchanges heat with the polar terminal of each individual battery.

[0014] This utility model also provides an energy storage device, including an energy storage cabinet and multiple battery clusters arranged along the x-direction. The battery component units of each battery cluster are installed on the mounting platform inside the energy storage cabinet. Adjacent battery clusters are electrically connected through a second electrical connection unit, and both the first and second electrical connection units are located on the door side of the energy storage cabinet. The second electrical connection unit includes two sets of second electrical connection components that are respectively connected to adjacent battery clusters. Each second electrical connection component includes a second busbar, a second insulating support, and multiple second electrical connection plates arranged along the x-direction. The second electrical connection plate is an L-shaped electrical connection plate. The horizontal plate of the L-shaped electrical connection plate is electrically connected to the battery component of the top or bottom battery component unit in the battery cluster. The vertical plate of the L-shaped electrical connection plate is fixedly clamped between two second busbars. One end of the second busbar is installed on the mounting platform through the second insulating support, and the other end is electrically connected to the second busbar connected to the adjacent battery cluster.

[0015] Furthermore, the third busbar clamps and fixes the end of the second busbar connected to the adjacent battery cluster, while the third busbar is mounted on the mounting platform through the third insulating support between the second electrical connection components.

[0016] Furthermore, the battery components in each battery component unit share a common battery management unit; the battery management unit includes multiple battery management modules and multiple sampling boards, each sampling board is set on each battery component in a one-to-one correspondence, and each sampling board of each battery component is connected to each battery management module in a one-to-one correspondence, and multiple battery management modules are integrated on a circuit board, which is located on the opening side of the energy storage cabinet.

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

[0018] 1. In the battery cluster of this utility model, adjacent battery component units are electrically connected through a first electrical connection unit. Both the first busbar and the L-shaped electrical connection plate in the first electrical connection unit are plate-shaped structures. This electrical connection method not only meets the requirements of high current transmission but also has good heat dissipation performance. Compared to cable connections, the contact area between the electrical connection plate and the battery component is larger, resulting in better current conduction performance. Furthermore, compared to cables, the electrical connection plate has better heat dissipation, facilitating more reliable current transmission. In addition, this electrical connection method can save installation space within the energy storage device and increase its energy density.

[0019] 2. In the battery cluster of this utility model, after the vertical plates of the two sets of L-shaped electrical connection plates are connected one-to-one, the overlapping part has the same dimension in the z-direction as the first busbar pressure plate, making the clamping of the vertical plates of the L-shaped electrical connection plates by the first busbar pressure plate more reliable and improving the reliability of the electrical connection. In addition, the non-electrically connected parts of the vertical plates of the L-shaped electrical connection plates are covered with heat-shrinkable insulating sleeves, which can improve the corrosion resistance and insulation of the L-shaped electrical connection plates.

[0020] 3. In this utility model's battery cluster, the L-shaped electrical connection plate is composed of multiple layers of pressed aluminum sheets. This not only gives the L-shaped electrical connection plate a large current-carrying area but also a certain degree of flexibility and deformability. This facilitates bending and can compensate for installation errors of battery components in the z-direction, resulting in a more reliable connection. Furthermore, both the L-shaped electrical connection plate and the first busbar pressure plate are made of aluminum sheets or plates, achieving both satisfactory electrical connection performance and low manufacturing costs.

[0021] 4. In the battery cluster of this utility model, a nut is integrally provided on the side of the first busbar pressure plate near the battery component, which facilitates the direct fixing of the first busbar pressure plate and the L-shaped electrical connection plate by means of screw connection. Compared with the method of setting the nut after the screw passes through the through hole, there is no need to reserve extra operating space, which improves the energy density of the energy storage device.

[0022] 5. In the battery cluster of this utility model, the battery component includes a shell and multiple individual cells arranged in the same direction within the shell; the shell has a shared chamber, and the multiple individual cells are placed inside the shell with the shared chamber. The shared chamber is connected to the inner cavity of each individual cell located in the shell, so that the electrolyte and gas of each individual cell are shared to ensure the consistency of each individual cell, reduce the difference between the electrolyte and gas of each individual cell, and improve the consistency between each individual cell to a certain extent, thereby improving the cycle life of the battery component to a certain extent.

[0023] 6. In the battery cluster of this utility model, a heat transfer tube is connected to the part of the polar terminal of each individual battery that extends out of the outer shell. The heat transfer tube exchanges heat with the polar terminal of each individual battery. A heat transfer medium flows inside the heat transfer tube. By controlling the temperature of the heat transfer medium, it can be ensured that the battery component always operates at the normal operating temperature.

[0024] 7. In the energy storage device of this utility model, the first electrical connection unit and the second electrical connection unit are both located on the opening side of the energy storage cabinet. This installation method not only facilitates the installation and connection of the first electrical connection unit and the second electrical connection unit, but also facilitates subsequent maintenance and replacement. Operators can perform corresponding operations on the opening side of the energy storage cabinet without entering the energy storage cabinet for installation and maintenance, thus saving space inside the energy storage cabinet.

[0025] 8. In this utility model energy storage device, the battery management modules of each battery component are integrated on a single circuit board, which facilitates the installation and maintenance of the battery management modules. It also saves the operating space required to maintain the battery management modules of each battery component separately, further improving the energy density of the entire energy storage device. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the battery cluster structure in Example 1;

[0027] Figure 2 This is an exploded view of the battery cluster in Example 1;

[0028] Figure 3 This is a schematic diagram showing the connection between the battery component and the first electrical connection plate in Example 1;

[0029] Figure 4 This is an exploded view of the first electrical connection unit in Example 1;

[0030] Figure 5 This is a schematic diagram of the structure of the first busbar pressure plate in Example 1;

[0031] Figure 6 This is a schematic diagram of the battery component in Example 2;

[0032] Figure 7This is a cross-sectional view of the battery component in Example 2;

[0033] Figure 8 This is a schematic diagram of the energy storage device in Example 3;

[0034] Figure 9 This is a schematic diagram of the structure of multiple battery clusters in Example 3;

[0035] Figure 10 This is a schematic diagram of the electrical connection between adjacent battery clusters in Example 3;

[0036] Figure 11 This is an exploded view of the second electrical connection unit in Example 3;

[0037] Figure 12 This is a schematic diagram of the battery cluster having a battery management unit in Example 3;

[0038] Reference numerals: 100-battery cluster, 200-mounting platform, 1-battery component, 2-first electrical connection unit, 3-second electrical connection unit, 4-battery management unit, 11-casing, 12-individual cell, 13-polar terminal, 14-heat transfer tube, 15-electrical busbar, 111-electrolyte sharing chamber, 112-gas sharing chamber, 21-first busbar pressure plate, 22-first insulating support, 23-first electrical connection plate, 211-nut, 221-mounting part, 222-support part, 223-blind slot, 231-horizontal plate, 232-vertical plate, 31-second busbar pressure plate, 32-second insulating support, 33-second electrical connection plate, 34-third busbar pressure plate. Detailed Implementation

[0039] The technical solution will be clearly and completely described below. Obviously, the described embodiments are only some embodiments, not all embodiments. Based on the following embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0040] It should also be noted that the terms "upper," "lower," "inner," and "outer" used in this document indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the purpose of simplifying the description and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the technical solution. Furthermore, the term "first" or "second" is used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this utility model should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrated connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] To ensure the charging and discharging capacity of existing energy storage devices, multiple individual batteries can be connected to form a battery module, then these battery modules can be connected in series to form a battery module unit, and multiple battery module units can be connected in series to form a battery cluster. Finally, multiple battery clusters can be connected to form an energy storage device with a large charging and discharging capacity. The aforementioned battery module can be an existing battery module, which consists of multiple individual batteries connected in parallel (this is a conventional design, where the electrolytes of the individual batteries in the battery module are not shared). Alternatively, the aforementioned battery module can be a large-capacity battery composed of multiple individual batteries connected in parallel with a shared electrolyte system, as detailed in Chinese patents CN117477186A, CN117477063A, CN115275453A, CN220324596U, CN117525773A, and CN117477063A, which disclose large-capacity batteries.

[0043] This invention provides a battery cluster comprising multiple battery component units arranged along the z-direction. Adjacent battery component units are electrically connected via a first electrical connection unit. The electrical connection plate in the first electrical connection unit has a plate-like structure. This electrical connection structure can meet the requirements of high current transmission while also providing good heat dissipation performance. Compared to electrical connection methods using cables and plug terminals, the electrical connection plate structure is simpler, has lower manufacturing costs, and is easier to connect and install on-site. Furthermore, this electrical connection structure allows for efficient layout within energy storage devices, saving installation space and increasing the energy density of the energy storage device.

[0044] Example 1

[0045] like Figure 1 As shown, this embodiment provides a battery cluster 100, which includes multiple battery component units arranged along the z-direction. Each battery component unit includes N battery components 1 arranged along the y-direction, and each battery component 1 includes multiple individual cells arranged along the x-direction, where N is an integer greater than or equal to 1. In this embodiment, the individual cells within each battery component 1 are connected in parallel, and the multiple battery components 1 are connected in series. This parallel-then-series electrical connection method can reduce circulating current phenomena.

[0046] After the aforementioned battery component units are arranged sequentially in the z-direction, adjacent battery component units are electrically connected through the first electrical connection unit 2. Since multiple battery components 1 in each battery component unit are connected in series, the two battery components 1 at both ends of the battery component unit serve as the electrical connection leads of the battery component unit. At this time, each end of the battery component unit has a first electrical connection unit 2. The first electrical connection unit 2 is electrically connected to the outermost battery component 1 of the battery component unit. Subsequently, the first electrical connection unit 2 realizes the electrical connection between the battery component unit and the battery component unit above or below.

[0047] In this embodiment, the number of first electrical connection units 2 is determined by the number of battery component units; specifically, the number of first electrical connection units 2 is one less than the number of battery component units. To achieve series connection between multiple battery component units, multiple first electrical connection units 2 are alternately arranged on different sides of each battery component unit. For example, as... Figure 9 and Figure 10 As shown, the battery cluster 100 includes 9 battery component units, which need to be connected in series through 8 sets of first electrical connection units 2. Specifically, among the 9 battery component units, the 1st and 2nd, the 3rd and 4th, the 5th and 6th, and the 7th and 8th are electrically connected through 4 sets of first electrical connection units 2 located on the rear side of the battery component units, while the 2nd and 3rd, the 4th and 5th, the 6th and 7th, and the 8th and 9th are electrically connected through 4 sets of first electrical connection units 2 located on the front side of the battery component units.

[0048] like Figure 2 and Figure 4 As shown, the first electrical connection unit 2 in this embodiment includes a first busbar plate 21, a first insulating support base 22, and two sets of first electrical connection components arranged along the z-direction. Each set of first electrical connection components includes multiple first electrical connection plates 23 arranged along the x-direction. Each first electrical connection plate 23 is an L-shaped electrical connection plate. The horizontal plate 231 of each L-shaped electrical connection plate is electrically connected to the outermost battery component 1 of the battery component unit. The vertical plates 232 of the two sets of L-shaped electrical connection plates are connected one-to-one. There are two first busbar plates 21, located on both sides of the overlapping portion of the vertical plates of the L-shaped electrical connection plates, which fix and clamp the vertical plates 232 of the multiple L-shaped electrical connection plates. The first busbar plate 21 clamps the vertical plates 232 of the multiple L-shaped electrical connection plates, which can ensure that the vertical plates 232 and the first busbar plate 21 can be in close contact, and the current transmission is more stable. There are two first insulating support bases 22, located at both ends of the first busbar plate 21, for mounting the two first busbar plates 21 on the mounting platform 200 of the battery component unit. The structure and connection of the above components are described in detail below.

[0049] In this embodiment, as Figure 2 and Figure 4 As shown, each of the first electrical connection plates 23 is an L-shaped electrical connection plate. The L-shaped electrical connection plate is made of a material with good conductivity, such as aluminum plate or copper plate. Considering both cost and conductivity, aluminum plate is preferred. In specific manufacturing, the L-shaped electrical connection plate can be formed by stamping a single thin plate or by stacking multiple thin plates.

[0050] In this embodiment, the L-shaped electrical connection plate is composed of multiple layers of pressed aluminum sheets. Based on the characteristics of current flow on the surface of a metal plate, the L-shaped electrical connection plate, constructed from multiple pressed aluminum sheets, has a large current-carrying area. Simultaneously, this L-shaped electrical connection plate also possesses a certain degree of flexibility and deformability. When there are installation errors in the height direction of the battery component, deformation can be used to compensate for these errors, making the connection more reliable.

[0051] The two ends of the L-shaped electrical connection plate are respectively connected to the battery component and the first busbar plate 21. Specifically, the horizontal plate 231 of each L-shaped electrical connection plate is electrically connected to the outermost battery component 1 in the battery component unit. The electrical connection can be achieved in the following ways.

[0052] First, the number of L-shaped electrical connection plates is the same as the number of individual cells 12 in the battery component 1. The horizontal plate 231 of the L-shaped electrical connection plate is connected to the polarity terminal 13 of each individual cell 12 in the battery component 1.

[0053] Secondly, the number of L-shaped electrical connection plates is not required. In this case, multiple individual cells 12 of battery component 1 are connected in parallel through electrical busbar 15, and the horizontal plates 231 of multiple L-shaped electrical connection plates are connected to electrical busbar 15, such as... Figure 3 As shown.

[0054] In this embodiment, the second electrical connection method is preferred. This method can use fewer L-shaped electrical connection boards, which reduces the cost. At the same time, there is no need to consider the positional correspondence between each L-shaped electrical connection board and the polarity terminal 13 of the individual battery 12 in the battery component 1, making the installation more convenient.

[0055] After the horizontal plate 231 of the L-shaped electrical connection plate is connected to the battery component 1, the vertical plates 232 of the two sets of L-shaped electrical connection plates are connected one-to-one and must overlap at least partially. That is, the vertical plates 232 of the two sets of L-shaped electrical connection plates overlap in the xz plane. Subsequently, the two first busbar plates 21 clamp the vertical plates 232 of the multiple L-shaped electrical connection plates, which can ensure that the vertical plates 232 and the first busbar plates 21 can be in close contact, making the current transmission more stable.

[0056] In this embodiment, after the vertical plates 232 of the two sets of L-shaped electrical connection plates are connected one-to-one, the overlapping portion in the z-direction can be the same as the z-direction dimension of the first busbar plate 21. This method not only improves the reliability of the connection between the two sets of L-shaped electrical connection plates, but also facilitates the connection between the L-shaped electrical connection plates and the first busbar plate. Furthermore, a heat-shrinkable insulating sleeve can be wrapped around the non-electrical connection portion of the vertical plate 232. The heat-shrinkable insulating sleeve can improve the corrosion resistance and insulation of the L-shaped electrical connection plate. It should be noted that the non-electrical connection portion is the area of ​​the vertical plate 232 excluding the area connected to the first busbar plate 21.

[0057] In this embodiment, the first busbar plate 21 has a flat plate structure. Considering both cost and conductivity, the first busbar plate 21 can be made of aluminum plate, ensuring flow rate while also reducing manufacturing costs. During installation, two first busbar plates 21 are positioned on either side of the L-shaped electrical connection plate, clamping the vertical plates 232 of the multiple L-shaped electrical connection plates within them. Subsequently, the first busbar plate 21 and the vertical plates 232 of the L-shaped electrical connection plate are fixedly connected. In this embodiment, both the vertical plates 232 of the L-shaped electrical connection plate and the first busbar plate 21 have multiple screw holes in corresponding positions, and they are fixed using screw connections. Screw connections are easier and simpler than welding or riveting methods.

[0058] like Figure 5 As shown, to facilitate screw connection, a nut 211 is fixedly provided on the first busbar plate 21 near the battery component 1 in this embodiment. The nut 211 is located on the side of the first busbar plate 21 near the battery component 1 and is integrally formed with the first busbar plate 21. When using screws for fixing, the screws can be directly rotated for installation, without the need to reserve installation space between the battery component and the first busbar plate 21. In other embodiments, if the nut 211 is not on the first busbar plate 21, sufficient operable space needs to be reserved between the battery component 1 and the first busbar plate 21 to facilitate screw connection. This operable space increases the installation space of the battery component unit and affects the energy density of the energy storage device.

[0059] After the two first busbar pressure plates 21 clamp and fix the vertical plates 232 of the multiple L-shaped electrical connection plates, first insulating support seats 22 are respectively provided at both ends of the first busbar pressure plates 21. The first insulating support seats 22 are fixedly installed on the mounting platform 200 of the battery component unit to fix and support the first busbar pressure plates 21, and at the same time realize the insulation between the first busbar pressure plates 21 and the mounting platform 200.

[0060] In this embodiment, as Figure 4As shown, the first insulating support 22 is made of epoxy board or bakelite and has an overall L-shaped structure, including a mounting part 221 and a support part 222. The support part 222 can be provided with bolt holes for connection to the mounting platform 200 of the battery component unit. The mounting part 221 is provided with a blind groove 223 for insertion and mating with the first busbar 21. The first busbar 21 between adjacent battery component units is insulated and fixed to the mounting platform 200 by the first insulating support 22, ensuring the stability and safety of the installation of the first busbar 21 and the L-shaped electrical connection plate, and improving the safety during current transmission.

[0061] Example 2

[0062] This embodiment is similar to Embodiment 1, except that the battery component 1 in this embodiment is a high-capacity battery.

[0063] like Figure 6 and Figure 7 As shown, the high-capacity battery component 1 provided in this embodiment includes a housing 11 and multiple individual battery cells 12 arranged in the same direction within the housing 11. The inner cavity of each individual battery cell 12 includes an electrolyte region and a gas region. After the multiple individual battery cells 12 are arranged in the same direction within the housing 11, a clearance hole is provided on the top plate of the housing 11 corresponding to the polarity terminal 13 of each individual battery cell 12. The polarity terminal 13 of each individual battery cell 12 extends out of the corresponding clearance hole as the polarity terminal of the high-capacity battery (the polarity terminals of all individual batteries located on one side serve as the positive polarity terminal of the high-capacity battery, and the polarity terminals of all individual batteries located on the other side serve as the negative polarity terminal of the high-capacity battery). The area of ​​the top plate of the housing 11 corresponding to the clearance hole is fixedly sealed to the housing of the individual battery cell 12.

[0064] It should be noted that the polarity terminal 13 of the single cell 12 here can be the terminal post of the single cell 12. In order to prevent the terminal post of the single cell 12 from not being able to extend smoothly out of the clearance hole as the polarity terminal 13, a terminal post adapter can be connected to the terminal post of the single cell 12, and the overall structure of the terminal post of the single cell 12 and the terminal post adapter can be used as the polarity terminal 13 of the single cell 12.

[0065] like Figure 7 As shown, the inner cavity of the outer casing 11 and the inner cavities of each individual battery cell 12 are all connected. The above-mentioned connection effect can be achieved by providing a shared chamber in the outer casing 11, so that the inner cavity of the shared chamber and the inner cavities of all individual battery cells 12 are connected.

[0066] The aforementioned shared chamber can be an electrolyte shared chamber 111. The inner cavity of the electrolyte shared chamber 111 is connected to the electrolyte area inside all individual battery cells 12. Through the electrolyte shared chamber 111, each individual battery cell 12 can be in a uniform electrolyte environment, ensuring the uniformity of the electrolyte in each individual battery cell 12 and improving the performance and charge-discharge cycle life of the large-capacity battery. In this embodiment, the electrolyte shared chamber 111 is a liquid channel located between the bottom plate of the outer casing 11 and the bottom of each individual battery cell 12.

[0067] The aforementioned shared chamber can also be a gas-sharing chamber 112. The inner cavity of the gas-sharing chamber 112 is connected to the gas region of the inner cavity of all individual battery cells 12. The gas balance of each individual battery cell 12 is achieved through the gas-sharing chamber 112, which can also improve the performance and charge-discharge cycle life of the large-capacity battery. In this embodiment, the gas-sharing chamber 112 is a gas channel provided on the top plate of the outer casing 11. At this time, the top plate of the outer casing 11 has a protrusion extending along the arrangement direction of the individual battery cells 12, and a gas channel is formed at the protrusion.

[0068] The aforementioned shared chamber can also be a gas-liquid shared chamber. The inner cavity of the gas-liquid shared chamber is connected to the electrolyte area and gas area of ​​all individual battery cells 12. Through a gas-liquid shared chamber, each individual battery cell 12 can be in a unified electrolyte environment and gas environment, which improves the performance and charge-discharge cycle life of the large-capacity battery.

[0069] like Figure 6 and Figure 7 As shown, to further enhance the safety of the large-capacity battery in this embodiment, a heat transfer pipe 14 is connected to the portion of the polar terminal 13 of each individual battery 12 that extends out of the outer casing 11. The heat transfer pipe 14 exchanges heat with the polar terminal 13 of each individual battery 12. When the temperature of the large-capacity battery is higher than a set threshold, a lower-temperature heat transfer medium is introduced into the heat transfer pipe 14 to cool the large-capacity battery. When the temperature of the large-capacity battery is lower than the set threshold, a higher-temperature heat transfer medium is introduced into the heat transfer pipe 14 to heat the large-capacity battery. By controlling the temperature of the heat transfer medium, it can be ensured that the large-capacity battery always operates at the normal operating temperature.

[0070] like Figure 6 and Figure 7 As shown, in this embodiment, each individual battery cell 12 has a through groove on its polarity terminal 13. The through groove extends through the polarity terminal 13 in the x direction. The top of the casing 11 of the large-capacity battery has two heat transfer tubes 14. Each heat transfer tube 14 extends along the x direction and the two heat transfer tubes 14 are arranged along the y direction. They are respectively embedded in the through grooves of each polarity terminal 13 located on different sides. The width of the through groove needs to ensure that the wall of the corresponding heat transfer tube 14 can be embedded.

[0071] The aforementioned heat transfer pipe 14 serves not only as a heat dissipation component but also as an electrical conductor to enable parallel connection of multiple individual battery cells 12. In a large-capacity battery, the polarity of the terminals 13 on the same side is the same, while the polarity of the terminals 13 on different sides is opposite. Two heat transfer pipes 14 are fixed to the polarity terminals 13 on both sides, enabling parallel connection of multiple individual battery cells 12. When the heat transfer pipe 14 is an electrical conductor, it can be made of high-purity aluminum alloy, such as 6063 aluminum alloy. In this case, the heat transfer medium flowing inside the heat transfer pipe 14 is an insulating medium. Alternatively, the heat transfer pipe 14 can also serve solely as a heat dissipation component. In this case, an electrical busbar 15 is installed at the open end of the through-slot to achieve electrical connection between the individual battery cells 12.

[0072] In this embodiment, an electrical busbar 15 is added above the heat transfer pipe 14 to achieve parallel connection between multiple individual cells 12 in the battery component 1. Specifically, one electrical busbar 15 is connected to the positive terminal 13 of each individual cell 12, and the other electrical busbar 15 is connected to the negative terminal 13 of each individual cell 12, thereby achieving parallel connection of multiple individual cells 12.

[0073] In addition, an insulating sealant layer can be laid on the top plate of the outer casing 11. When condensation occurs on the surface of the heat transfer tube 14, the condensation cannot penetrate into the gap between the polar terminal 13 and the clearance hole due to the obstruction of the insulating sealant layer, thereby preventing the battery from short-circuiting. An insulating protective cover can also be installed on the top of the outer casing 11 to provide insulation protection for the polar terminal 13, avoiding potential safety hazards caused by the exposure of the polar terminal 13 during the operation of the battery component 1, and also preventing foreign objects from falling into the polar terminal 13 and causing a short circuit in the battery component 1, thus improving the safety of the battery component 1.

[0074] Example 3

[0075] like Figure 8 and Figure 9 As shown, this embodiment provides an energy storage device, which includes an energy storage cabinet and multiple battery clusters 100 as in Embodiment 1 or Embodiment 2. The battery component units in each battery cluster 100 are arranged on the mounting platform 200 inside the energy storage cabinet. The multiple battery clusters 100 are arranged sequentially along the x-direction, and adjacent battery clusters 100 are electrically connected through a second electrical connection unit 3.

[0076] As can be seen from the battery cluster 100 in Embodiment 1 or Embodiment 2, after the battery component units in each battery cluster 100 are electrically connected through the first electrical connection unit 2, the two battery component units at the top and bottom of the battery cluster 100 respectively serve as the electrical connection leads of the battery cluster 100. At this time, as... Figure 9 and Figure 10As shown, in order to realize the series connection between multiple battery clusters 100, multiple second electrical connection units 3 are arranged alternately at the top or bottom of each battery cluster 100. Each second electrical connection unit 3 is electrically connected to the top or bottom battery component unit of the adjacent battery cluster 100, thereby realizing the series connection between multiple battery clusters 100.

[0077] like Figure 10 and Figure 11 As shown, the second electrical connection unit 3 includes two sets of second electrical connection components arranged along the x-direction, which are electrically connected to adjacent battery clusters respectively. Each second electrical connection component includes a second busbar 31, a second insulating support 32, and a second electrical connection plate 33 arranged along the x-direction. The second electrical connection plate 33 is an L-shaped electrical connection plate. The horizontal plate 231 of each L-shaped electrical connection plate is electrically connected to the battery component of the top or bottom battery component unit in the battery cluster 100. The vertical plate 232 is fixedly clamped between the two second busbars 31. One end of the second busbar 31 is mounted on the mounting platform 200 through the second insulating support 32, and the other end is electrically connected to the second busbar 31 connected to the adjacent battery cluster 100.

[0078] When the two sets of second busbars 31 are electrically connected, their ends overlap at least partially, and then the overlapping portion is directly fixed with screws. This connection method requires specific positioning of the two sets of second busbars during on-site installation.

[0079] like Figure 11 As shown, the second electrical connection unit 3 in this embodiment also includes two third busbar plates 34. The two sets of second electrical connection components are connected through the two third busbar plates 34. The two third busbar plates 34 clamp and fix the ends of the second busbar plates 31, and the third busbar plates 34 are supported by the second insulating support base between the second electrical connection components. This connection method does not have high requirements for the connection after the installation of the second busbar plates. Even if there is some deviation in the installation position of the two sets of second busbar plates in the z-direction or y-direction, the two sets of second busbar plates can still be connected through the third busbar plates 34 without considering the deviation in the installation position of the two sets of second busbar plates, making on-site installation relatively simple.

[0080] The energy storage device of this utility model uses a first electrical connection unit 2 and a second electrical connection unit 3 to arrange multiple battery component units in the z direction (i.e., vertical expansion) or multiple battery clusters in the x direction (i.e., horizontal expansion). This method not only realizes the reasonable layout of multiple battery components 1 in the energy storage device, but also allows for the reasonable adjustment of the number of battery component units and battery clusters in the energy storage device group according to needs, ensuring the energy density of the energy storage device.

[0081] like Figure 8and Figure 9 As shown, in this embodiment, the energy storage cabinet of the energy storage device has a double-door structure, that is, the cabinet door in the xz plane is an openable door. During on-site installation, the battery component units of each battery cluster are pushed into the energy storage cabinet along the y direction. At this time, the first electrical connection unit 2 and the second electrical connection unit 3 are both located on the opening side of the energy storage cabinet, that is, the first electrical connection unit 2 and the second electrical connection unit 3 are both located on the side of the energy storage cabinet where the cabinet door can be opened. This installation method not only facilitates the installation and connection of the first electrical connection unit and the second electrical connection unit, but also facilitates subsequent maintenance and replacement. Operators can perform corresponding operations on the opening side of the energy storage cabinet without entering the energy storage cabinet for installation and maintenance, thus saving space inside the energy storage cabinet.

[0082] like Figure 12 As shown, to ensure the safe and reliable operation of each battery component 1, the battery cluster 100 is equipped with a battery management unit 4. This battery management unit 4 manages the battery components 1 within the battery cluster 100. Multiple battery components in each battery component unit within the battery cluster share one battery management unit. The battery management unit 4 includes multiple battery management modules and multiple sampling boards. Each sampling board is correspondingly installed on each battery component 1, and each sampling board of each battery component 1 is connected to a corresponding battery management module. Multiple battery management modules are integrated onto a single circuit board, which is mounted on the installation platform 200. During installation, each sampling board is installed on each battery component 1 to collect information such as voltage, current, and temperature. The collected information is then transmitted to each battery management module via a data acquisition line. The battery management module performs functions such as overload and short-circuit protection, high-voltage sampling, and low-voltage control for the battery component 1.

[0083] In this embodiment, the circuit board can be installed on the opening side of the energy storage cabinet. That is, the installation position of the circuit board is similar to that of the first electrical connection unit, both being installed on the side of the energy storage cabinet where the cabinet door can be opened. This installation method not only facilitates the installation and connection of the battery management unit, but also makes subsequent maintenance and replacement easier.

[0084] In this utility model's battery cluster 100, only a sampling board is installed on each battery component 1, and the battery management modules of each battery component 1 are integrated onto a single circuit board. This arrangement simplifies the structure of each battery component 1, reduces its volume, and increases the energy density of the entire energy storage device. Furthermore, integrating the battery management modules of multiple battery components 1 onto a single circuit board facilitates the installation and maintenance of the battery management modules, while also saving the operational space required for individual maintenance of the battery management modules of each battery component 1, further enhancing the energy density of the entire energy storage device.

Claims

1. A battery cluster, characterized in that, It includes multiple battery component units arranged along the z-direction; each battery component unit includes N battery components arranged along the y-direction, and each battery component includes multiple single cells arranged along the x-direction, where N is an integer greater than or equal to 1; Each adjacent battery component unit is provided with a first electrical connection unit, thereby realizing the series connection of each battery component unit in the battery cluster; The first electrical connection unit includes a first busbar, a first insulating support base, and two sets of first electrical connection components arranged along the z-direction; Each group of first electrical connection components includes multiple first electrical connection plates arranged along the x-direction. The first electrical connection plates are L-shaped electrical connection plates. The horizontal plates of each L-shaped electrical connection plate are electrically connected to the outermost battery component in the battery component unit. The vertical plates of the two groups of L-shaped electrical connection plates are connected one-to-one and at least partially overlap. There are two first busbars, located on both sides of the overlapping part of the vertical plates, which fix and clamp the vertical plates of multiple L-shaped electrical connection plates; there are two first insulating support seats, located at both ends of the first busbars, which are used to install the two first busbars on the mounting platform of the battery component unit.

2. The battery cluster according to claim 1, characterized in that, The battery component consists of multiple individual cells connected in parallel via an electrical busbar, and the horizontal plates of each L-shaped electrical connection plate are connected to the electrical busbar.

3. The battery cluster according to claim 1, characterized in that, After the vertical plates of the two sets of L-shaped electrical connection plates are connected one-to-one, the overlapping part has the same dimension in the z direction as the first busbar pressure plate in the z direction, and the non-electrical connection part of the vertical plate is covered with a heat-shrinkable insulating sleeve.

4. The battery cluster according to claim 1, characterized in that, The L-shaped electrical connection board is composed of multiple layers of pressed aluminum sheets, with the first busbar plate being an aluminum plate.

5. The battery cluster according to claim 1, characterized in that, A nut is integrally provided on the side of the first busbar pressure plate near the battery component, and the two first busbar pressure plates and the vertical plate of the L-shaped electrical connection plate are fixedly connected by screws.

6. The battery cluster according to claim 1, characterized in that, The first insulating support includes a mounting part and a support part. The support part is used to connect with the mounting platform of the battery component unit, and the mounting part is provided with a blind groove for insertion and mating with the first busbar plate.

7. The battery cluster according to any one of claims 1 to 6, characterized in that, The battery component includes a housing and multiple individual batteries arranged in the same direction within the housing; the housing has a shared chamber, the inner cavity of which is connected to the inner cavities of all individual batteries; the top plate of the housing has clearance holes corresponding to the polarity terminals of each individual battery; the polarity terminals of each individual battery extend out of the clearance holes, and the area of ​​the top plate of the housing corresponding to the clearance holes is fixedly sealed to the individual battery housing.

8. The battery cluster according to claim 7, characterized in that, Each individual cell has a heat transfer tube extending from its outer casing onto its polar terminal. The heat transfer tube exchanges heat with the polar terminal of each individual cell.

9. An energy storage device, characterized in that, The device includes an energy storage cabinet and multiple battery clusters arranged along the x-direction as described in any one of claims 1 to 8. The battery component units of each battery cluster are installed on the mounting platform inside the energy storage cabinet. Adjacent battery clusters are electrically connected through a second electrical connection unit, and both the first electrical connection unit and the second electrical connection unit are located on the door side of the energy storage cabinet. The second electrical connection unit includes two sets of second electrical connection components that are respectively connected to adjacent battery clusters. Each second electrical connection component includes a second busbar, a second insulating support, and multiple second electrical connection plates arranged along the x-direction. The second electrical connection plates are L-shaped. The horizontal plates of the L-shaped electrical connection plates are electrically connected to the battery components of the top or bottom battery component units in the battery cluster. The vertical plates of the L-shaped electrical connection plates are fixedly clamped between the two second busbars. One end of the second busbar is mounted on the mounting platform through the second insulating support, and the other end is electrically connected to the second busbar connected to the adjacent battery cluster.

10. The energy storage device according to claim 9, characterized in that, The second electrical connection unit also includes two third busbars, which clamp and fix the ends of the second busbars connected to the adjacent battery clusters. The third busbars are mounted on the mounting platform via a third insulating support between the second electrical connection components.

11. The energy storage device according to claim 9, characterized in that, Each battery component unit shares a battery management unit; the battery management unit includes multiple battery management modules and multiple sampling boards, each sampling board is set on each battery component, and each sampling board of each battery component is connected to each battery management module. Multiple battery management modules are integrated on a circuit board, which is located on the door side of the energy storage cabinet.

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