Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a mounting platform, a high-capacity battery, a first connecting bar assembly and a second connecting bar assembly, the M high-capacity batteries are installed on the installation platform side by side in the x direction, and M is an integer larger than 1; the high-capacity batteries are connected in series; the first connecting row assembly is used for being connected in series with another battery pack in the z direction; and the second connecting row assembly is used for being connected in series with another battery pack in the x direction. According to the battery pack adopting the first connecting row assembly and the second connecting row assembly, a plurality of battery packs can be expanded in the z direction, and can also be arranged and expanded in the x direction, so that the energy density of an energy storage system can be ensured while the reasonable layout of the plurality of battery packs in the container is realized; and meanwhile, packaging and transportation of the energy storage system can be facilitated.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to a battery pack. Background Art

[0002] The existing lithium battery technology is mainly applied to electric vehicles as the power source of electric vehicles, and is also applied to power plants as an energy storage system for storing and releasing electric energy.

[0003] The energy storage system can be used in the power grid to fill peaks and cut valleys, and meet the power supply demands during peak and valley periods in different time periods and regions of the urban distribution network.

[0004] The energy storage system needs to have a large charge-discharge capacity, so multiple battery packs need to be electrically connected and installed in a container. How to ensure the reasonable layout of multiple battery packs in the container to improve the energy density of the energy storage system is a technical problem urgently to be solved in the current field. Summary of the Utility Model

[0005] The utility model provides a battery pack, which meets the purpose of reasonably arranging multiple battery packs to improve the energy density of the energy storage device.

[0006] The battery pack includes an installation platform, a large-capacity battery, a first connection row assembly, and a second connection row assembly; there are M large-capacity batteries, which are arranged side by side on the installation platform along the x direction, where M is an integer greater than 1; the large-capacity batteries are connected in series; the first connection row assembly is used to connect in series with another battery pack in the z direction; the second connection row assembly is used to connect in series with another battery pack in the x direction.

[0007] The battery pack of the utility model adopting the first connection row assembly and the second connection row assembly can arrange multiple battery packs in the z direction (i.e., expand up and down), and can also arrange multiple battery packs in the x direction (i.e., expand left and right), realizing the reasonable layout of multiple battery packs in the container while ensuring the energy density of the energy storage system;

[0008] Moreover, the utility model can arrange multiple battery packs in the z direction (i.e., expand up and down), and can also arrange multiple battery packs in the x direction (i.e., expand left and right), and can also reasonably adjust the dimensions of the container in the z direction and the x direction according to requirements, which is beneficial to the packaging and transportation of the container.

[0009] Furthermore, the large-capacity battery includes a housing, a bracket assembly, and N single batteries; where N is an integer greater than 1; the N single batteries are arranged along the y direction in the housing;

[0010] The housing is provided with at least one shared chamber extending along the y direction;

[0011] The top plate of the housing is provided with avoidance holes that allow the polarity terminals of each single battery to extend out; the polarity terminals of each single battery extend out of the corresponding avoidance holes, and the housing area around the avoidance holes is fixedly sealed to the single battery housing; the bracket assembly includes a support member and two L-shaped brackets;

[0012] The supporting structure includes two supporting ribs, which are respectively used to be inserted into the two channels at the bottom of the shell; the supporting ribs include a first insulating layer and a second insulating layer; the first insulating layer is an electroplated insulating layer; and the second insulating layer is a plastic-coated insulating layer.

[0013] The support ribs of the present invention are provided with two insulating layers, one is an electroplated insulating layer, and the other is a plastic-coated insulating layer. The two layers of insulation improve the insulation performance between the support ribs and the large-capacity battery. At the same time, when the temperature of the battery pack rises sharply, the insulation performance of the plastic-coated insulating layer decreases or even fails, the electroplated insulating layer can still ensure the insulation between the large-capacity battery casing and the support ribs, thereby improving the insulation reliability of the support ribs and the safety of the battery pack.

[0014] Furthermore, there are two shared chambers, one shared chamber connects the gas areas of the single cells, and the other shared chamber connects the electrolyte areas of the single cells.

[0015] Furthermore, in order to save the size of the battery pack in the x direction and improve the energy density of the energy storage system, the creepage distance between the L-shaped bracket and the large-capacity battery casing is insufficient. In order to ensure insulation, the above-mentioned L-shaped bracket includes a first plate and a second plate that are fixedly connected, and the first plate and the second plate are perpendicular to each other; the first plate and the second plate are both provided with a third insulating layer; the third insulating layer is a plastic-coated insulating layer.

[0016] Furthermore, the above-mentioned L-shaped bracket also includes a connecting rod inserted into the supporting rib, and the supporting rib and the connecting rod are positioned and fixed by bolt connection, and the bolt connection position is covered with an insulating sleeve. The bolt fixing method improves the stability of the connection between the L-shaped bracket and the large-capacity battery, and the insulating sleeve can also improve the insulation between the bolt and the large-capacity battery casing.

[0017] Furthermore, the first connection bar assembly includes a first electrical connection plate, a busbar, and an insulating support base; there are two insulating support bases; the insulating support base includes a fixed connector and an insulating block; the fixed connector includes a vertical portion and a horizontal portion; the horizontal portion is used to connect to the mounting platform; the insulating block is fixed to the vertical portion, and a blind groove is provided on the insulating block for plugging and mating with the busbar;

[0018] The two ends of the busbar are respectively inserted into the blind grooves of the insulating blocks in the two insulating support seats;

[0019] There are multiple first electrical connection plates. The upper end of each first electrical connection plate is correspondingly connected to a single cell pole of a large-capacity battery in the battery pack, and the lower end of each first electrical connection plate is fixedly connected to the bus bar.

[0020] Furthermore, the part of the bus bar for plugging into the blind slot is coated with an insulating sleeve; the first electrical connection plate is coated with a heat-shrinkable insulating sleeve.

[0021] Furthermore, the bus bar includes a first bus bar and a second bus bar; the first bus bar and the second bus bar fixedly clamp the lower ends of multiple first electrical connection plates between the two by means of screw connection.

[0022] Furthermore, the second connection row assembly includes a second electrical connection plate and an insulating support plate member;

[0023] There are multiple second electrical connection plates. The upper end of each second electrical connection plate is used to correspondingly connect to a single cell pole of a large-capacity battery in the battery pack, and the lower end of each second electrical connection plate is used to be fixedly connected to the insulating support plate member; the insulating support plate member is used to be fixedly installed on the installation platform of the battery pack.

[0024] Furthermore, the insulating support plate member includes a first insulating plate and a second insulating plate; the first insulating plate is made of phenolic resin board, and the second insulating plate is a ceramic backing plate. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the battery pack;

[0026] Figure 2 is a schematic structural diagram of the first perspective after multiple battery packs are connected;

[0027] Figure 3 is a schematic structural diagram of the second perspective after multiple battery packs are connected;

[0028] Figure 4 is a first perspective cross-sectional view of the large-capacity battery;

[0029] Figure 5 is a second perspective cross-sectional view of the large-capacity battery;

[0030] Figure 6 is a third perspective cross-sectional view of the large-capacity battery;

[0031] Figure 7 is a structural diagram of the first connection row assembly;

[0032] Figure 8 is a structural diagram of the insulating support seat;

[0033] Figure 9 is a structural diagram of the second connection row assembly.

[0034] The reference numerals are as follows:

[0035] 100 - battery pack;

[0036] 1 - installation platform, 11 - first cross beam, 12 - second cross beam;

[0037] 2 - high - capacity battery, 21 - housing, 22 - bracket assembly, 221 - support member, 2211 - support rib, 222 - L - shaped bracket, 2221 - first bracket, 2222 - second bracket, 2223 - connecting rod, 23 - single cell, 24 - shared chamber, 25 - channel;

[0038] 3 - first connection row assembly, 31 - insulating support base, 311 - fixed connecting piece, 312 - insulating block, 313 - blind groove, 314 - bolt hole, 32 - bus bar piece, 321 - first bus bar plate, 322 - second bus bar plate, 33 - first electrical connection plate, 3111 - vertical part, 3112 - horizontal part;

[0039] 4 - second connection row assembly, 41 - second electrical connection plate, 411 - first horizontal plate, 412 - vertical plate, 413 - second horizontal plate, 42 - insulating support plate member, 421 - first insulating plate, 422 - second insulating plate;

[0040] 5 - vertical electrical connection row, 6 - horizontal electrical connection row. Detailed implementation manners

[0041] The technical solutions will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments, rather than all embodiments. Based on the following embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0042] Meanwhile, it should be noted that the orientation or positional relationships indicated by the terms "upper, lower, inner and outer" in the text are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of simplified description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the technical solutions. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In this utility model, unless otherwise specified or limited, the terms "mounted, connected, and connected" should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection. They can also refer to mechanical connection, electrical connection, direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0044] like Figure 1 As shown, this embodiment provides a battery pack 100, including a mounting platform 1, a large-capacity battery 2, a first connecting bar assembly 3, and a second connecting bar assembly 4;

[0045] The mounting platform 1 is a rectangular frame formed by connecting two first beams 11 and two second beams 12 end to end; the first beams 11 extend along the x-direction, and the second beams 12 extend along the y-direction;

[0046] N large-capacity batteries 2 are installed side by side on the installation platform 1 along the x direction, N ≥ 2; the large-capacity batteries 2 are connected in series;

[0047] like Figure 2 and Figure 3 As shown, the first connecting bar assembly 3 is used to connect in series with another battery pack 100 in the z-direction via vertical electrical connecting bars 5; the second connecting bar assembly 4 is used to connect in series with another battery pack 100 in the x-direction via horizontal electrical connecting bars 6. In other words, the first connecting bar assembly 3 and the second connecting bar assembly 4 serve as the total positive and total negative terminals of the battery pack, respectively.

[0048] The first connecting bar assembly 3 and the second connecting bar assembly 4 can arrange multiple battery packs 100 in the z direction (i.e., expand vertically), or can arrange multiple battery packs 100 in the x direction (i.e., expand horizontally), thereby achieving a reasonable layout of multiple battery packs 100 in the container while ensuring the energy density of the energy storage system;

[0049] In addition, the present invention can arrange multiple battery packs 100 in the z direction (i.e., expand up and down), and can also arrange multiple battery packs 100 in the x direction (i.e., expand left and right). The dimensions of the container in the z and x directions can also be reasonably adjusted according to needs, which is conducive to the packaging and transportation of the container.

[0050] In this embodiment, the structure of the large-capacity battery is as follows:

[0051] like Figures 4 to 6 As shown, the large-capacity battery 2 includes a housing 21, a bracket assembly 22, and N single cells 23; wherein N is an integer greater than 1; the N single cells 23 are arranged in the housing 21 along the same y direction;

[0052] The housing 21 is provided with at least one shared chamber 24 extending in the y direction;

[0053] When there is one shared chamber 24, the gas zones of multiple single cells 23 can be connected, so that each single cell 23 is under one air pressure system; or the electrolyte zones of multiple single cells 23 can be connected, so that each single cell 23 is under one shared electrolyte system;

[0054] When there are two shared chambers 24, one of the shared chambers connects the gas zones of multiple single cells, so that each single cell is under one air pressure system, and the other shared chamber connects the electrolyte zones of multiple single cells, so that each single cell is under one shared electrolyte system;

[0055] The top plate of the housing 21 is provided with avoidance holes through which the polarity terminals of each single cell 23 can extend; the polarity terminals of each single cell 23 extend out of the corresponding avoidance holes, and the area of the housing around the avoidance holes is fixedly sealed with the single cell housing; the positive polarity terminals of all single cells 23 are connected as the total positive electrode of the large-capacity battery, and the negative polarity terminals of all single cells 23 are connected as the total negative electrode of the large-capacity battery;

[0056] The bracket assembly 22 includes a support member 221 and two L-shaped brackets 222;

[0057] The L-shaped bracket 222 includes a first bracket 2221 and a second bracket 2222, where the first bracket 2221 is parallel to the xz plane and the second bracket 2222 is parallel to the xy plane. That is to say, in the L-shaped bracket of the present invention, the first bracket 2221 and the second bracket 2222 are perpendicular to each other, and the included angle between the two is 90°. The first brackets 2221 of the two L-shaped brackets 222 are respectively fixed at both ends of the support member, and the second brackets 2222 are respectively used for fixedly connecting with the two second cross beams 12 of the installation platform. The L-shaped bracket can also adopt a variety of different structural forms. In this embodiment, an L-shaped plate can be used. The first plate parallel to the xz plane can be used as the first bracket and connected to the support member, and the second plate parallel to the xy plane can be used as the second bracket for fixing with the installation platform. In some other embodiments, an L-shaped support rod can also be used. The first rod parallel to the xz plane can be used as the first bracket and connected to the support member, and the second rod parallel to the xy plane can be used as the second bracket for fixing with the installation platform.

[0058] The support member 221 includes two support ribs 2211, and the two support ribs 2211 are respectively used for inserting into two channels 25 at the bottom of the housing 21; the support ribs 2211 are provided with a first insulating layer and a second insulating layer; the first insulating layer is an electroplated insulating layer; the second insulating layer is a plastic-coated insulating layer. The design of the two insulating layers of the support member 221 can improve the insulation performance between the support ribs and the large-capacity battery. At the same time, when the temperature of the battery pack rises sharply, resulting in the decline or even failure of the insulation performance of the plastic-coated insulating layer, the electroplated insulating layer can still ensure the insulation between the housing of the large-capacity battery and the support ribs, thereby improving the insulation reliability of the support ribs and the safety of the battery pack.

[0059] In order to shorten the distance of the large-capacity battery in the y direction to improve the energy density of the energy storage system, but this results in an insufficient creepage distance between the L-shaped bracket 222 and the housing of the large-capacity battery. To ensure insulation, the above L-shaped bracket 222 has a plastic-coated insulating layer. Specifically, when the L-shaped bracket 222 is an L-shaped plate, the first plate and the second plate are both provided with a plastic-coated insulating layer, or when the L-shaped bracket 222 is an L-shaped support rod, the first rod and the second rod are both provided with a plastic-coated insulating layer.

[0060] Preferably, in this embodiment, since the L-shaped bracket 222 further includes a connecting rod 2223 inserted into the support rib 2211, the support rib 2211 and the connecting rod 2223 are positioned and fixed by means of bolt connection, and an insulating sleeve is coated at the bolt connection position. The bolt fixing method improves the connection stability between the L-shaped bracket and the large-capacity battery, and at the same time, the insulating sleeve can also improve the insulation between the bolt and the housing of the large-capacity battery.

[0061] In this embodiment, as Figure 7 and Figure 8 shown, the first connection row assembly 3 includes an insulating support base 31, a bus bar 32, and N first electric connection plates 33; there are two insulating support bases 31; the insulating support base 31 includes a fixed connecting member 311 and an insulating block 312; the fixed connecting member 311 includes a vertical portion 3111 and a horizontal portion 3112; the horizontal portion 3112 is used for connecting with the installation platform; the insulating block 312 is fixed to the vertical portion, and a blind slot 313 for plugging and matching with the bus bar is provided on the insulating block 312; both ends of the bus bar 32 are respectively inserted into the blind slots 313 of the insulating blocks in the two insulating support bases 31; there is a safety gap between the bus bar 32 and the installation platform 1; preferably, in order to ensure insulation, the part of the bus bar for plugging into the blind slot is coated with an insulating sleeve;

[0062] There are N first electric connection plates 33. The upper end of each first electric connection plate 33 is respectively connected to a single cell pole of the first large-capacity battery or the Mth large-capacity battery, and the lower end of each first electric connection plate 33 is fixedly connected to the bus bar 32.

[0063] Specifically, in this embodiment, the bus bar 32 includes a first bus bar plate 321 and a second bus bar plate 322; the first bus bar plate 321 and the second bus bar plate 322 fixedly clamp the lower ends of a plurality of first electrical connection plates 33 therebetween, and fix the lower ends of the first electrical connection plates 33 to the bus bar by means of screw connection. It should be noted that: the area of this screw connection can also be used as a fixed area for electrically connecting with the first connection row assembly of another battery pack;

[0064] In some other embodiments, the bus bar 32 can be just a bus bar plate. The two ends of the bus bar plate are fixed to the insulating support base, and the electrical connection plate is fixed to the bus bar by means of screw connection. However, compared with the method of clamping the electrical connection plate by the first bus bar plate and the second bus bar plate and then fixing it by screw connection, there may be virtual contact points between the electrical connection member and the bus bar. The virtual contact points will have problems such as excessive resistance and poor current transmission, and the virtual contact points will have problems such as continuous heating and even burning. Therefore, compared with this embodiment, the structure of this embodiment is safer and more reliable.

[0065] It should be emphasized that: for the convenience of assembly, the first electrical connection plate 33 and the bus bar 32 need to be made of flexible metal materials, for example: aluminum materials or copper materials; aluminum has a lower cost than copper, but copper has a better conductivity. Considering both cost and conductivity, in this embodiment, the electrical connection plate is made of aluminum material and the bus bar is made of copper material.

[0066] In this embodiment, the insulating block in the insulating support base 31 is made of epoxy board. Two bolt holes 314 are opened on the insulating block 312. The two bolt holes 314 are respectively located above and below the blind groove 313, and the two bolt holes 314 and the blind groove 313 are isolated from each other; the vertical part and the horizontal part of the fixed connection member 311 are integrally formed of metal materials.

[0067] Preferably, in order to improve the corrosion resistance and insulation of the first electrical connection plate 33, a heat shrinkable insulating sleeve is provided on each first electrical connection plate 33. It should be noted that: the part of the first electrical connection plate provided with the heat shrinkable insulating sleeve is the area except for the area connected to the single battery pole column and the area connected to the bus bar plate.

[0068] In this embodiment, as Figure 9 shown, the second connection row assembly 4 includes a second electrical connection plate 41 and an insulating support plate member 42;

[0069] There are multiple second electrical connection plates 41. The upper end of each second electrical connection plate 41 is used to correspondingly connect to a single cell pole of a high-capacity battery in the battery pack, and the lower end of each second electrical connection plate is used to be fixedly connected to the insulating support plate member 42; the insulating support plate member 42 is used to be fixedly installed on the installation platform of the battery pack. Specifically, the insulating support plate member 42 is fixed on the second cross beam 12 and has a length in the y direction equivalent to that of the high-capacity battery.

[0070] In this embodiment, the insulating support plate member 42 includes a first insulating plate 421 and a second insulating plate 422; the first insulating plate 421 is made of bakelite, and the second insulating plate 422 is a ceramic backing plate. Compared with using only bakelite, the insulation effect is better.

[0071] In this embodiment, the second electrical connection plate 41 includes a first horizontal plate 411, a vertical plate 412, and a second horizontal plate 413; the first horizontal plate 411 is used to connect to a single cell pole of a high-capacity battery in the battery pack, and a part of the second horizontal plate 413 is used to connect to the insulating support plate member, and another part is used to be connected in series with the second connection row assembly of another battery pack through the horizontal electrical connection row 6.

[0072] Preferably, in order to improve the corrosion resistance and insulation of the second electrical connection plate, a heat-shrinkable insulating sleeve is provided on the second electrical connection plate 41. It should be noted that: the part of the second electrical connection plate where the heat-shrinkable insulating sleeve is provided is the area excluding the area connected to the single cell pole and the area connected to the insulating support plate member.

Claims

1. A battery pack, characterized in that, It includes an installation platform, a large-capacity battery, a first connection row assembly, and a second connection row assembly; There are M large-capacity batteries, which are arranged side by side on the installation platform along the x direction, where M is an integer greater than 1; the large-capacity batteries are connected in series with each other; The first connection row assembly is used to be connected in series with another battery pack in the z direction; The second connection row assembly is used to be connected in series with another battery pack in the x direction.

2. A battery pack according to claim 1, characterized in that, The large-capacity battery includes a housing, a bracket assembly, and N single cells; where N is an integer greater than 1; the N single cells are arranged in the housing along the same y direction; The housing is provided with at least one shared chamber extending along the y direction; The top plate of the housing is provided with avoidance holes that can make the polar terminals of each single cell protrude; the polar terminals of each single cell protrude through the corresponding avoidance holes, and the area of the housing around the avoidance holes is fixedly sealed with the single cell housing; The bracket assembly includes a support member and two L-shaped brackets; The support member includes two support ribs, and the two support ribs are respectively used to be inserted into two channels at the bottom of the housing; the support ribs include a first insulating layer and a second insulating layer; the first insulating layer is an electroplated insulating layer; the second insulating layer is a plastic-coated insulating layer.

3. A battery pack according to claim 2, characterized in that: There are two shared chambers. One shared chamber connects the gas areas of each single cell, and the other shared chamber connects the electrolyte areas of each single cell.

4. A battery pack according to claim 2 or 3, characterized in that: The L-shaped bracket includes a first plate and a second plate that are fixedly connected, and the first plate and the second plate are perpendicular to each other; both the first plate and the second plate are provided with a third insulating layer; the third insulating layer is a plastic-coated insulating layer.

5. A battery pack according to claim 4, characterized in that: The L-shaped bracket further includes a connecting rod inserted into the support rib. The support rib and the connecting rod are positioned and fixed by means of bolt connection, and an insulating sleeve is coated at the bolt connection position.

6. The battery pack according to claim 1, characterized in that: The first connection row assembly includes an electric connection plate, a busbar, and an insulating support seat; There are two insulating support seats; the insulating support seat includes a fixed connecting piece and an insulating block; the fixed connecting piece includes a vertical part and a horizontal part; the horizontal part is used to be connected to the installation platform; the insulating block is fixed to the vertical part, and a blind groove for plugging and matching with the busbar is provided on the insulating block; Both ends of the busbar are respectively inserted into the blind grooves of the insulating blocks in the two insulating support seats; There are multiple first electric connection plates. The upper end of each first electric connection plate is correspondingly connected to a single cell pole column of a large-capacity battery in the battery pack, and the lower end of each first electric connection plate is fixedly connected to the busbar.

7. A battery pack according to claim 6, characterized in that, The part of the busbar used for plugging into the blind groove is coated with an insulating sleeve; the first electric connection plate is coated with a heat-shrinkable insulating sleeve.

8. A battery pack according to claim 7, wherein The busbar includes a first busbar plate and a second busbar plate; the first busbar plate and the second busbar plate fixedly clamp the lower ends of multiple first electric connection plates between them by means of screw connection.

9. A battery pack according to claim 1, characterized in that, The second connection row assembly includes a second electric connection plate and an insulating support plate member; There are multiple second electric connection plates. The upper end of each second electric connection plate is used to be correspondingly connected to a single cell pole column of a large-capacity battery in the battery pack, and the lower end of each second electric connection plate is used to be fixedly connected to the insulating support plate member; the insulating support plate member is used to be fixedly installed on the installation platform of the battery pack.

10. A battery pack according to claim 9, wherein, The insulating support plate member includes a first insulating plate and a second insulating plate; the first insulating plate is made of bakelite, and the second insulating plate is a ceramic backing plate.

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