A battery pack and energy storage system

Abstract

The application provides a battery pack and an energy storage system. The battery pack comprises a shell, a circuit board, a spacer block and a plurality of battery cells. The shell comprises a first side plate. The spacer block, and first and second battery cells of the plurality of battery cells are adjacent to one side of the first side plate, and the spacer block is spaced from the first and second battery cells. The circuit board is adjacent to the other side of the first side plate. The first side plate is provided with a through hole, and a positive bus bar and a negative bus bar of the battery pack pass through the through hole and are connected with a battery management system of the circuit board. In the case of thermal runaway, the spacer block prevents short circuit connection between the first and second battery cells, thereby improving the safety of the battery pack.

Description

Technical Field

[0001] This application relates to the field of energy technology, and in particular to a battery pack and energy storage system. Background Technology

[0002] Battery packs are used for power supply or energy storage and are widely used in various energy-related industries, such as site communication, energy storage, and automotive. In site communication scenarios, a battery pack specifically includes side-by-side cell modules and a battery management system (BMS). The BMS manages and controls the operating status of the cell modules. Each cell module includes a housing and multiple cells located within the housing, with an explosion-proof valve on top of each cell. The cell module also includes a bus assembly located on top of the aforementioned cells. These cells include adjacent positive and negative terminals, which are connected to the bus assembly. The bus assembly extends from the top of the cell module from the housing and connects to the BMS.

[0003] When either the main positive or negative battery cell experiences thermal runaway expansion, the blue film on those two cells melts, causing a short circuit between them and posing a safety risk to the battery pack. Furthermore, to prevent short circuits between the busbar assembly and the cell module casing, the casing height is typically limited to the cell height. However, when either the main positive or negative battery cell experiences thermal runaway, the electrolyte inside the cell may spray from the top and onto the BMS, potentially causing carbonization or fire on the circuit boards inside the BMS. Utility Model Content

[0004] This application provides a battery pack and energy storage system, which uses a spacer block to separate the total positive cell from the total negative cell to prevent short circuit connection between the total positive cell and the total negative cell, thereby improving the safety of the battery pack.

[0005] In a first aspect, this application provides a battery pack. The battery pack specifically includes a housing, a spacer block, and multiple battery cells, with the spacer block and the multiple battery cells located within the housing. The housing includes a first side plate, the plane of which is perpendicular to the length direction of the battery pack. The multiple battery cells include a first battery cell and a second battery cell. The first battery cell, the spacer block, and the second battery cell are arranged sequentially along the width direction of the battery pack, and each of the first battery cell, the spacer block, and the second battery cell is adjacent to one side of the plane of the first side plate. The spacer block is used to space the first battery cell and the second battery cell apart along the width direction of the battery pack. A circuit board of the battery pack is located on the plane of the first side plate, facing away from the multiple battery cells. A battery management system (BMS) is disposed on the circuit board. The first side plate has through holes through which one end of the positive busbar and one end of the negative busbar of the battery pack pass, and both ends of the positive and negative busbars are electrically connected to the BMS. The other end of the positive busbar is electrically connected to the terminal of the first battery cell, and the other end of the negative busbar is electrically connected to the terminal of the second battery cell.

[0006] In the battery pack of this application, one of the first and second cells can serve as the overall positive electrode cell, and the other can serve as the overall negative electrode cell. The placeholder block is used to assist in the structural design of the battery pack and the layout of the multiple cells, and does not participate in the storage or release of electrical energy. The first side plate is provided with through holes, through which the positive and negative busbars can connect to the BMS. In practical applications, the BMS is provided with notches to allow the positive and negative busbars to extend into the notches and connect to the BMS. When the first or second cell experiences thermal runaway, the placeholder block can prevent a short circuit between the first and second cells, thereby improving the safety of the battery pack.

[0007] In one implementation, the projection of the occupant block overlaps with the projection of the through hole along the length of the battery pack. This way, in the event of thermal runaway of the first or second battery cell, the occupant block can partially block the electrolyte from passing through the through hole, further improving the safety of the battery pack.

[0008] In one implementation, the positive busbar is located on top of the first battery cell and the negative busbar is located on top of the second battery cell in the height direction of the battery pack. In the height direction, the upper edge of the first side plate is higher than or flush with the aforementioned battery cells. That is, the height of the first side plate can be greater than or equal to the height of the multiple battery cells without affecting the connection of the positive and negative busbars to the BMS. When the first or second battery cell experiences thermal runaway, the first side plate can prevent at least a portion of the electrolyte from splashing onto the BMS, thereby mitigating BMS carbonization and improving the safety of the battery pack.

[0009] In one implementation, the projection of the positive busbar overlaps with the projection of the placeholder block along the height direction of the battery pack. And / or, the projection of the negative busbar overlaps with the projection of the placeholder block. In this implementation, the positive and / or negative busbars can be partially positioned on top of the placeholder block. This allows the positive and / or negative busbars to extend directly towards and through the through-hole from the top of the placeholder block, simplifying the layout of the positive and / or negative busbars. Furthermore, the size of the through-hole can be designed according to the thickness of the battery cell.

[0010] In one implementation, the battery pack further includes a busbar bracket. The busbar bracket is located between the first battery cell and the positive busbar, and between the second battery cell and the negative busbar. A portion of the busbar bracket is located between the spacer block and the through-hole, and an insulating element is provided between the busbar bracket and the through-hole. In the battery pack, the busbar bracket can be used to fix the positions of the positive and negative busbars and ensure the reliability of the connection points between the positive busbar and the first battery cell, and between the negative busbar and the second battery cell. Additionally, the busbar bracket may also have functions such as insulation and heat dissipation. In this implementation, a portion of the busbar bracket may be located between the spacer block and the through-hole to fix and support the portions of the positive and negative busbars extending into the through-hole. The insulating element separates the through-hole from the busbar bracket, the positive busbar, and the negative busbar. Therefore, even if the positive and negative busbars deform, they will not overlap with the first side plate, thus avoiding a short circuit between the busbars and the casing.

[0011] In one implementation, an insulating element is filled between the busbar support and the through-hole. This filling of the space between the busbar support and the through-hole prevents short-circuit connections between the positive and negative busbars and the through-hole.

[0012] In one implementation, the housing further includes a second side plate, a third side plate, and a fourth side plate, which are sequentially connected. In a specific implementation, the housing can serve as part of the battery pack's outer casing and is used to secure the spacer block and multiple battery cells. Specifically, the housing may also include a cover plate and a base plate disposed opposite to each other. The first side plate, the second side plate, the third side plate, and the fourth side plate are located between the cover plate and the base plate, and the first side plate, the second side plate, the third side plate, the fourth side plate, the base plate, and a portion of the cover plate together form the housing. In the height direction of the battery pack, another portion of the cover plate is located on top of the battery management system. That is, the cover plate covers the housing and the BMS. Alternatively, in another specific implementation, the battery pack further includes a cover plate and an outer casing, with the cover plate capable of covering the outer casing. The housing and the outer casing are independently configured, with the housing and the circuit board located within the outer casing.

[0013] In one implementation, the height of the first side plate in the height direction of the battery pack is 1 to 1.2 times the height of the first cell. Therefore, the first side plate within this size range can block some of the splashed electrolyte without significantly increasing the height of the battery pack.

[0014] In one implementation, the depth of the through-hole in the height direction of the battery pack is less than or equal to 2 / 3 of the height of the first battery cell. Therefore, the actual size of the through-hole can be designed according to the size of the first battery cell.

[0015] In one implementation, the thickness of the placeholder block in the width direction of the battery pack can be greater than the width of the through-hole in that width direction, and the projection of the placeholder block in the length direction of the battery pack can cover the projection of the through-hole. Therefore, the size of the through-hole can be less than or equal to the thickness of the placeholder block, and the placeholder block can at least partially block electrolyte splashed onto the BMS through the through-hole. Alternatively, in the width direction, the width of the through-hole is 2 to 4.2 times the thickness of the first cell. In this way, in addition to the positive and negative busbars, other busbars or wiring harnesses can also be connected to the BMS through the through-hole. Therefore, when other busbars or wiring harnesses also need to pass through the first side plate, the number of openings on the first side plate can be reduced.

[0016] In one implementation, the height of the placeholder block is 2 / 3 to 1.1 times the height of the first battery cell in the height direction of the battery pack. And / or, the thickness of the placeholder block is 1 to 1.1 times the thickness of the first battery cell in the width direction of the battery pack. And / or, the width of the placeholder block is 2 / 3 to 1.1 times the width of the first battery cell in the length direction of the battery pack. Since the placeholder block assists in the structural design of the battery pack and the layout of the multiple battery cells, the actual size of the placeholder block can be designed based on the dimensions of the first and second battery cells.

[0017] In one implementation, a first battery cell and a second battery cell are respectively disposed adjacent to a spacer block. One end of the positive bus extends along the length of the battery pack and is connected to the BMS. The other end of the positive bus extends along the width of the battery pack and is connected to the first battery cell. One end of the negative bus extends along the length of the battery pack and is connected to the BMS. The other end of the negative bus extends along the width of the battery pack and is connected to the second battery cell. Therefore, the positive and negative buses are respectively L-shaped and can be at least partially disposed on the top of the spacer block, thereby directly extending into the through-hole from the top of the spacer block and connecting to the BMS, which simplifies the bus layout and facilitates bus minimization. Furthermore, the placeholder block directly separates the first battery cell from the second battery cell, so even if the blue film on the surface of the first battery cell and / or the second battery cell melts during thermal runaway, the placeholder block can still prevent a short circuit connection between the first battery cell and the second battery cell.

[0018] Secondly, this application also provides an energy storage system. The energy storage system includes a power converter and a battery pack (as described in the first aspect). The power converter converts external electrical energy into power and outputs it to the battery pack. Inside the battery pack of the energy storage system of this application, a spacer block prevents short-circuit connections between the first and second battery cells, thereby improving the safety of the battery pack and the energy storage system. Attached Figure Description

[0019] Figure 1 Application scenarios for the energy storage system provided in the embodiments of this application;

[0020] Figure 2 Electrical schematic diagram of the battery pack provided in the embodiments of this application;

[0021] Figure 3 A schematic diagram of a battery pack provided in an embodiment of this application;

[0022] Figure 4 A schematic diagram of another battery pack provided in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the battery cell module provided in the embodiments of this application;

[0024] Figure 6 for Figure 5 Top view of the core module;

[0025] Figure 7 for Figure 5 Exploded view of the core module of China Electronics Technology Group Corporation (CETC).

[0026] Figure 8 for Figure 5 A schematic diagram of the housing of the battery module;

[0027] Figure 9 for Figure 7 A schematic diagram of the central occupant block and multiple battery cells;

[0028] Figure 10 for Figure 5 Side view of the battery module;

[0029] Figure 11 for Figure 10 A partial schematic diagram of the battery pack;

[0030] Figure 12 Another side view of the battery cell module provided in an embodiment of this application.

[0031] Figure label:

[0032] 10-battery pack

[0033] 11-Cover plate

[0034] 12-cell module

[0035] 13-BMS

[0036] 14-Bottom Shell

[0037] 121-Shell

[0038] 122-cell

[0039] 123-Bus Components

[0040] 124-First side plate

[0041] 125 - Second Side Plate

[0042] 126-Third side plate

[0043] 127-Fourth Side Panel

[0044] 128-Placeholder Block

[0045] 129-Insulating Components

[0046] 130-Busbar Support

[0047] 1221 - First Cell

[0048] 1222 - Second Cell

[0049] 1231-Positive busbar

[0050] 1232-Negative busbar

[0051] 1241 - Through Hole Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0053] To facilitate understanding of the battery pack and energy storage system provided in this application embodiment, their application scenarios are described below. This application provides an energy storage system that can be used in multiple application scenarios, including site communication, industrial and commercial energy storage, and power plant energy storage. Industrial and commercial energy storage may include, for example, small-scale industrial and commercial (small factories, etc.) energy storage, medium-scale industrial and commercial energy storage, large-scale industrial and commercial energy storage, photovoltaic-energy storage-charging station energy storage, and small and medium-sized microgrid (island, etc.) energy storage. Power plant energy storage may include, for example, wind-solar-energy storage power stations, grid-connected energy storage power stations, and large-scale microgrid power stations. In addition, the energy storage system can also be used in application scenarios such as data centers and vehicle charging stations. In this application, the energy storage system includes a power converter and at least one battery pack. The power converter is used to convert external electrical energy into power and output it to the aforementioned at least one battery pack.

[0054] Figure 1 This describes the application scenarios of the energy storage system provided in the embodiments of this application. For example... Figure 1 As shown, the energy storage system may also include a rectifier, a power supply unit (PSU), a load shunt, a battery shunt, and battery fuses. Optionally, the energy storage system may also include a monitoring module and / or a battery limit disconnect (BLVD) contactor. AC mains power is rectified by the PSU to supply power to the load and simultaneously charge the battery pack. When the mains power is interrupted, the battery pack discharges and supplies power to the load. This system can use a pure lithium-ion battery pack configuration, or it can use a hybrid configuration of lithium-ion and lead-acid battery packs. Systems with hybrid battery packs can be equipped with a monitoring module to prioritize the charging and discharging of the lithium-ion battery pack, thereby extending the lifespan of the lead-acid battery pack.

[0055] Specifically, the battery pack may include a cell module and a BMS, with multiple cells of the cell module electrically connected to the BMS. Figure 2 The electrical schematic diagram is provided for an embodiment of the battery pack in this application. Figure 2 As shown, within the battery pack, the BMS is used to manage the charging and discharging of multiple cells in the cell module, and to acquire data such as voltage, current, temperature, state of charge (SOC) parameters, and state of health (SOH) parameters of the aforementioned multiple cells.

[0056] In this application, each battery cell includes a cell casing, and a positive terminal, a negative terminal, and an explosion-proof valve are disposed on the top of the cell casing. When the battery cell experiences thermal runaway, the internal pressure of the battery cell increases, causing the explosion-proof valve to open, thereby releasing high-temperature gas and electrolyte to prevent the battery cell from exploding.

[0057] Additionally, the battery pack includes a cover plate that covers the cell module and the BMS. The cell module includes a housing and the aforementioned multiple cell cells, wherein the cover plate can close onto the housing, with the multiple cell cells located inside the housing and the BMS located outside the housing. The housing includes a side plate located between the BMS and the aforementioned multiple cell cells. The cell module also includes a bus assembly located on top of the multiple cell cells, the bus assembly for connecting the total positive and total negative cell cells to the BMS.

[0058] In existing battery packs, the main positive cell and the main negative cell are arranged adjacent to each other, so that the bus connecting the main positive cell and the main negative cell is connected to the BMS through an opening in the side panel. However, when the main positive cell or the main negative cell undergoes thermal runaway expansion, the blue film of the main positive cell and the main negative cell is melted, thereby causing a short circuit between the main positive cell and the main negative cell, posing a safety risk to the battery pack.

[0059] Furthermore, to prevent short circuits caused by the busbar assembly overlapping with the side panel, the existing side panel is typically shorter than the cell height, resulting in a larger gap between the side panel and the cover plate to allow the busbar to pass through and connect to the BMS. However, in the event of thermal runaway in the cell, electrolyte sprayed from the explosion-proof valve may splash onto the BMS through this gap, potentially causing carbonization or fire of the circuit boards inside the BMS.

[0060] In view of this, this application provides a battery pack and an energy storage system, which uses a spacer block to separate the total positive cell from the total negative cell to prevent short circuit connection between the total positive cell and the total negative cell, thereby improving the safety of the battery pack.

[0061] It should be noted that the terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0062] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0063] In this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0064] Furthermore, in this article, directional terms such as "top," "bottom," "upper," and "lower" are defined relative to the orientation of the structure as shown in the attached drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the structure.

[0065] Figure 3This is a schematic diagram of a battery pack provided in an embodiment of this application. Figure 3 As shown, the battery pack 10 includes a cover plate 11, a cell module 12, and a battery management system (BMS) 13. The cell module 12 and BMS 13 are arranged adjacent to each other, and the cover plate 11 covers the top of the cell module 12 and BMS 13. Therefore, the cover plate 11, cell module 12, and BMS 13 form the outer surface of the battery pack 10.

[0066] Figure 4 This is a schematic diagram of another battery pack provided in an embodiment of this application. (See diagram below.) Figure 4 As shown, the battery pack 10 includes a cover plate 11, a cell module 12, a battery management system (BMS) 13, and a bottom shell 14. The cover plate 11 can close onto the bottom shell 14, and the cell module 12 and BMS 13 are located inside the bottom shell 14. Therefore, the cover plate 11 and the bottom shell 14 form the outer surface of the battery pack 10.

[0067] Figure 5 This is a schematic diagram of the battery cell module provided in an embodiment of this application. Figure 6 for Figure 5 Top view of the core module of China Electronics Technology Group Corporation (CETC). Figure 7 for Figure 5 Exploded view of the battery module. Figure 5 , Figure 6 and Figure 7 As shown, the battery module 12 of this application specifically includes a housing 121, a plurality of battery cells 122, and a bus assembly 123. The plurality of battery cells 122 are housed within the housing 121, and the bus assembly 123 is electrically connected to the BMS 13 and the plurality of battery cells 122.

[0068] Figure 8 for Figure 5 A schematic diagram of the casing of the battery cell module. (See diagram below.) Figure 8 As shown, the housing 121 may specifically include a first side plate 124, a second side plate 125, a third side plate 126, and a fourth side plate 127, which are sequentially connected and form a frame structure. The housing 121 also includes a bottom plate, which covers one side of the first side plate 124, the second side plate 125, the third side plate 126, and the fourth side plate 127. Figure 5 and Figure 6 As shown, the plurality of battery cells 122 are located within the frame structure of the housing 121, and the BMS 13 is disposed outside the frame structure of the housing 121. In this embodiment, the housing 121 can be used to support and fix the plurality of battery cells 122, and can also separate the BMS 13 from the plurality of battery cells 122.

[0069] To facilitate the explanation of the relative positions of the various components of the battery pack 10, embodiments of this application introduce the length direction L, width direction W, and height direction H of the battery pack 10 for illustration. For example, the cell module 12 and BMS 13 are arranged side by side along the length direction L of the battery pack 10, and the fourth side plate 127 is located between the BMS 13 and the plurality of cells 122. The bus assembly 123 is disposed on top of the plurality of cells 122 along the height direction H of the battery pack 10.

[0070] In the above embodiment, the battery pack 10 is provided with a side plate, which is used to separate the BMS 13 and the plurality of battery cells 122. That is, the plurality of battery cells 122, the side plate, and the BMS 13 are arranged sequentially along the length L of the battery pack 10. In a specific embodiment, the side plate and the first side plate 124 can be independent components, and the side plate and the first side plate 124 are fixedly connected. Figure 3 and Figure 5 As shown, in another specific embodiment, the side plate can serve as the first side plate 124 of the housing 121, thereby simplifying the structure of the battery housing 11. The plane containing the side plate is perpendicular to the length direction L of the battery pack 10.

[0071] The following embodiment is illustrated using the first side plate 124 as an example.

[0072] Figure 9 for Figure 7 A schematic diagram of the central storage block and multiple battery cells. (See diagram below.) Figure 9 As shown, the aforementioned plurality of battery cells 122 may include a first battery cell 1221 and a second battery cell 1222. The battery pack 10 also includes a placeholder block 128. In the width direction W of the battery pack 10, the first battery cell 1221, the placeholder block 128, and the second battery cell 1222 are arranged sequentially, that is, the placeholder block 128 separates the first battery cell 1221 and the second battery cell 1222. The placeholder block 128, the first battery cell 1221, and the second battery cell 1222 are respectively disposed adjacent to the fourth side plate 127.

[0073] It should be noted that the total positive electrode refers to the positive terminal output by the entire battery pack 10, which is usually drawn from the highest potential point of multiple cells 122. The cell at the highest potential point is the total positive electrode cell, i.e., the single cell with the highest potential. The total negative electrode refers to the negative terminal output by the entire battery pack 10, which is usually drawn from the lowest potential point of multiple cells 122. The cell at the lowest potential point is the total negative electrode cell, i.e., the single cell with the lowest potential. The first cell 1221 can be the total positive electrode cell, and the second cell 1222 can be the total negative electrode cell. Alternatively, the first cell 1221 can be the total negative electrode cell, and the second cell 1222 can be the total positive electrode cell.

[0074] The placeholder block 128 assists in the structural design of the battery pack 10 and the layout of the multiple battery cells 122, and does not participate in the storage or release of electrical energy. In practical applications, depending on the compact mechanical structure of the battery pack 10, the multiple battery cells 122 can be distributed in an array. However, due to power design or space constraints, the multiple battery cells 122 may not be able to completely fill the array layout. The placeholder block 128 can be placed in the gaps of the array layout to prevent the multiple battery cells 122 from being displaced due to vibration or impact.

[0075] The placeholder block 128 has temperature resistance and can withstand temperatures exceeding 450°C. The material of the placeholder block 128 may include any one of polymers, silicates, carbon materials, alloys, and derivatives thereof. The surface of the placeholder block 128 may be covered or filled with a high-temperature resistant thermal insulation material, such as any one of mica, ceramics, silicone foam, silicone rubber, aerogel, phase change heat-absorbing materials, and derivatives thereof.

[0076] Since the placeholder block 128 assists in the structural design of the battery pack 10 and the layout of the multiple battery cells 122, the size of the placeholder block 128 can be equal to or unequal to the size of the battery cell 122, depending on the size of the battery cell 122. For example, in the height direction H of the battery pack 10, the height of the placeholder block 128 is 2 / 3 to 1.1 times the height of the first battery cell 1221. And / or, in the width direction W of the battery pack 10, the thickness of the placeholder block 128 is 1 to 1.1 times the thickness of the first battery cell 1221. And / or, in the length direction L of the battery pack 10, the width of the placeholder block 128 is 2 / 3 to 1.1 times the width of the first battery cell 1221.

[0077] In the above embodiments, the height of the battery cell 122 (including the first battery cell 1221 and the second battery cell 1222) refers to the maximum dimension of the battery cell 122 in the height direction H of the battery pack 10. The thickness of the battery cell 122 refers to the maximum dimension in the width direction W of the battery pack 10. The width of the battery cell 122 refers to the maximum dimension in the length direction L of the battery pack 10.

[0078] In an embodiment of this application, the first side plate 124 is provided with a through hole 1241, through which the bus assembly 123 is connected to the BMS 13. Thus, the height of the first side plate 124 does not affect the connection between the bus assembly 123 and the BMS 13. In practical applications, the BMS 13 is provided with a notch to allow the bus assembly 123 to extend into the notch and connect to the BMS 13.

[0079] In one specific embodiment, the projection of the occupant block 128 overlaps with the projection of the through hole 1241 along the length L of the battery pack 10. Thus, when the first cell 1221 or the second cell 1222 explodes, the occupant block 128 at least partially blocks the through hole 1241, thereby reducing the amount of electrolyte passing through the through hole 1241.

[0080] In one specific embodiment, the height of the first side plate 124 can be greater than or equal to the height of the cell 122. When the cell 122 in the cell module 12 experiences thermal runaway, the first side plate 124 can block at least part of the electrolyte from splashing onto the BMS 13, thereby improving the safety of the battery pack 10.

[0081] like Figure 5 and Figure 6 As shown, the bus assembly 123 includes a positive bus 1231 and a negative bus 1232. The positive bus 1231 is located on top of the first cell 1221 in the height direction H of the battery pack 10, and the first cell 1221 is connected to the positive bus 1231. The negative bus 1232 is located on top of the second cell 1222 in the height direction H of the battery pack 10, and the second cell 1222 is connected to the negative bus 1232.

[0082] It should be noted that the positive bus 1231 refers to the conductor that collects the positive current of multiple cells 122 and ultimately connects to the total positive terminal of the battery pack 10. The negative bus 1232 refers to the conductor that collects the negative current of multiple cells 122 and ultimately connects to the total negative terminal of the battery pack 10. The following explanation uses the first cell 1221 as the total positive cell and the second cell 1222 as the total negative cell as an example.

[0083] Figure 10 for Figure 5 Side view of the battery module. Figure 11 for Figure 10 A partial schematic diagram of the battery pack, in which, Figure 11 The diagram shows the first battery cell, the placeholder block, the second battery cell, and the first side plate. (See diagram for reference.) Figure 10 and Figure 11 As shown, in a specific embodiment, in the height direction H of the battery pack 10, the height of the first side plate 124 is greater than or equal to the height of the first cell 1221. Furthermore, in the length direction L of the battery pack 10, the projection of the occupant block 128 overlaps with the projection of the through hole 1241. This overlap means that the two projections can partially overlap, or one projection completely falls within the other. The positive busbar 1231 and the negative busbar 1232 are connected to the BMS 13 through the through hole 1241.

[0084] like Figure 5As shown, the positive busbar 1231 and negative busbar 1232 can be connected to the BMS13 through the through-hole 1241. Thus, the height of the first side plate 124 can be greater than or equal to the height of the first cell 1221 without obstructing the extension of the positive busbar 1231 and negative busbar 1232 toward the BMS13. In the event of thermal runaway of the cell 122, the electrolyte inside the cell 122 may splash into the battery casing 11 through the explosion-proof valve. The through-hole 1241 of the first side plate 124 is positioned opposite to the occupant block 128 and their projections overlap, preventing electrolyte from directly splashing out at the position opposite to the through-hole 1241. Furthermore, the height of the first side plate 124 can also block some electrolyte, thereby improving the phenomenon of electrolyte splashing onto the BMS13 and enhancing the safety of the battery pack 10.

[0085] In one specific embodiment, in the height direction H of the battery pack 10, the height of the first side plate 124 can be 1 to 1.2 times the height of the cell 122.

[0086] like Figure 8 As shown, the projection of the positive busbar 1231 in the height direction H of the battery pack 10 and the projection of the placeholder block 128 in the height direction H of the battery pack 10 may overlap. In this embodiment, the positive busbar 1231 may be partially disposed on the top of the placeholder block 128. In this way, the positive busbar 1231 may extend directly toward and through the through hole 1241 from the top of the placeholder block 128.

[0087] Similarly, the projection of the negative busbar 1232 in the height direction H of the battery pack 10 may overlap with the projection of the placeholder block 128 in the height direction H of the battery pack 10. In this embodiment, the negative busbar 1232 may be partially disposed on the top of the placeholder block 128. In this way, the negative busbar 1232 may extend directly toward and through the through hole 1241 from the top of the placeholder block 128.

[0088] In some embodiments, at least one battery cell 122 may be disposed between the first battery cell 1221 and the placeholder block 128, and at least one battery cell 122 may also be disposed between the second battery cell 1222 and the placeholder block 128.

[0089] In other embodiments, such as Figure 6As shown, the first battery cell 1221 and the second battery cell 1222 are respectively disposed adjacent to the placeholder block 128. One end of the positive bus 1231 extends along the width direction W of the battery pack 10, and this end of the positive bus 1231 is connected to the first battery cell 1221. The other end of the positive bus 1231 extends along the length direction L of the battery pack 10, and this other end of the positive bus 1231 is connected to the BMS 13. One end of the negative bus 1232 extends along the width direction W of the battery pack 10, and this end of the negative bus 1232 is connected to the second battery cell 1222. The other end of the negative bus 1232 extends along the length direction L of the battery pack 10, and this other end of the negative bus 1232 is connected to the BMS 13. Therefore, the positive busbar 1231 and the negative busbar 1232 are respectively arranged in an L-shape and can be partially located on the top of the placeholder block 128. This allows the through hole 1241 to extend directly from the top of the placeholder block 128 and connect to the BMS 13, simplifying the layout of the busbar 13 and minimizing its size. Furthermore, the placeholder block 128 directly separates the first battery cell 1221 and the second battery cell 1222. Even if the blue film on the surface of the first battery cell 1221 and / or the second battery cell 1222 melts during thermal runaway, the placeholder block 128 can still prevent a short circuit between the first battery cell 1221 and the second battery cell 1222.

[0090] In some embodiments, the projection of the placeholder block 128 along the longitudinal direction L of the battery pack 10 covers the through hole 1241. Therefore, the size of the through hole 1241 can be less than or equal to the thickness of the placeholder block 128, which can at least partially prevent the electrolyte of the first cell 1221 and the electrolyte of the second cell 1222 from splashing onto the BMS 13 through the through hole 1241.

[0091] In some embodiments, the thickness of the placeholder block 128 in the width direction W of the battery pack 10 can be greater than the width of the through hole 1241 in the width direction W, and the projection of the placeholder block 128 in the length direction of the battery pack 10 can cover the through hole 1241. Therefore, the size of the through hole 1241 can be less than or equal to the thickness of the placeholder block 128, and the placeholder block 128 can prevent at least a portion of the electrolyte of the first cell 1221 and the electrolyte of the second cell 1222 from being splashed onto the BMS through the through hole 1241.

[0092] In some other embodiments, the width of the through-hole 1241 in the width direction W of the battery pack 10 can be 2 to 4.2 times the thickness of the first cell 1221. This allows other buses or wiring harnesses, besides the positive bus 1231 and negative bus 1232, to be connected to the BMS through the through-hole 1241. Therefore, when other buses or wiring harnesses also need to pass through the first side plate 124, the number of openings in the first side plate 124 can be reduced.

[0093] In the height direction H of the battery pack 10, the depth of the through hole 1241 is less than or equal to 2 / 3 times the height of the first battery cell 1221. Therefore, the actual size of the through hole 1241 can be designed according to the size of the first battery cell 1221.

[0094] Furthermore, the battery pack 10 also includes a busbar bracket. The busbar bracket is located between the first battery cell 1221 and the positive busbar 1231, and between the second battery cell 1222 and the negative busbar 1232. The busbar bracket portion is located between the placeholder block 128 and the through hole 1241, and an insulating element is provided between the busbar bracket and the through hole 1241. The busbar bracket can be used to fix the positions of the positive busbar 1231 and the negative busbar 1232, and to ensure the reliability of the connection points between the positive busbar 1231 and the first battery cell 1221, and between the negative busbar 1232 and the second battery cell 1222. In addition, the busbar bracket may also have functions such as insulation and heat dissipation.

[0095] In the above embodiment, a portion of the busbar support may be located between the occupant block 128 and the through hole 1241 to fix and support the portions of the positive busbar 1231 and the negative busbar 1232 that extend into the through hole 1241. An insulating element separates the through hole 1241 from the busbar support, the positive busbar 1231, and the negative busbar 1232. Therefore, even if the positive busbar 1231 and the negative busbar 1232 deform, they will not overlap with the first side plate 124, thereby preventing a short circuit between the busbar assembly 123 and the housing 121.

[0096] Figure 12 Another side view of the battery cell module provided in an embodiment of this application. (See attached image.) Figure 12 As shown, the insulating element 129 fills the space between the busbar support 130 and the through hole 1241. Thus, the space between the busbar support 130 and the through hole 1241 is filled with the insulating element 129, preventing short-circuit connections between the positive busbar 1231 and the negative busbar 1232 and the through hole 1241. The material of the insulating element 129 may include any one of mica, ceramic, silicone foam, silicone rubber, aerogel, phase change heat-absorbing materials, and derivatives of the above materials.

[0097] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that: The battery pack includes a housing, a spacer block located within the housing, and multiple battery cells. The housing includes a first side plate, the plane of which is perpendicular to the length direction of the battery pack. A first battery cell, the spacer block, and a second battery cell are arranged sequentially in the width direction of the battery pack and are adjacent to one side of the plane of the first side plate. The spacer block is used to space the first battery cell and the second battery cell apart in the width direction. A circuit board of the battery pack is located in the plane of the first side plate on the side opposite to the multiple battery cells, and a battery management system is provided on the circuit board. The first side plate has a through hole, and one end of the positive busbar of the battery pack and one end of the negative busbar of the battery pack pass through the through hole and are electrically connected to the battery management system; the other end of the positive busbar is electrically connected to the terminal of the first cell, and the other end of the negative busbar is electrically connected to the terminal of the second cell.

2. The battery pack of claim 1, wherein, Along the length direction, the projection of the occupant block overlaps with the projection of the through hole.

3. The battery pack as described in claim 1 or 2, characterized in that, In the height direction of the battery pack, the positive busbar is located on top of the first cell, and the negative busbar is located on top of the second cell; in the height direction, the upper edge of the first side plate is higher than or flush with the plurality of cells.

4. The battery pack of claim 3, wherein, In the height direction, the projection of the positive busbar overlaps with the projection of the placeholder block, and / or, the projection of the negative busbar overlaps with the projection of the placeholder block.

5. The battery pack of claim 1 or 2, wherein, The battery pack also includes a busbar bracket, which is located between the first battery cell and the positive busbar, and between the second battery cell and the negative busbar; The busbar support portion is located between the occupant block and the through hole, and an insulating element is provided between the busbar support and the through hole.

6. The battery pack as described in claim 1 or 2, characterized in that, The housing also includes a second side plate, a third side plate, and a fourth side plate, wherein the first side plate, the second side plate, the third side plate, and the fourth side plate are connected in sequence; The housing further includes a cover plate and a bottom plate disposed opposite to each other; the first side plate, the second side plate, the third side plate, and the fourth side plate are located between the cover plate and the bottom plate, and the first side plate, the second side plate, the third side plate, the fourth side plate, the bottom plate, and a portion of the cover plate enclose the housing; in the height direction of the battery pack, another portion of the cover plate is located on top of the battery management system; or The battery pack also includes a cover and a housing, the cover being closed to the housing, and the housing and the circuit board being located inside the housing.

7. The battery pack of claim 1 or 2, wherein, In the height direction of the battery pack, the height of the first side plate is 1 to 1.2 times the height of the first cell.

8. The battery pack of claim 1 or 2, wherein, In the height direction of the battery pack, the depth of the through hole is less than or equal to 2 / 3 times the height of the first cell.

9. The battery pack as described in claim 1 or 2, characterized in that, The thickness of the placeholder block in the width direction is greater than the width of the through hole in the width direction; in the length direction, the projection of the placeholder block overlaps the projection of the through hole; or, In the width direction, the width of the through hole is 2 to 4.2 times the thickness of the first battery cell.

10. The battery pack of claim 1 or 2, wherein, In the height direction of the battery pack, the height of the occupant block is 2 / 3 to 1.1 times the height of the first battery cell; and / or In the width direction, the thickness of the occupant block is 1 to 1.1 times the thickness of the first battery cell; and / or In the length direction, the width of the occupant block is 2 / 3 to 1.1 times the width of the first battery cell.

11. An energy storage system, characterized in that, It includes a power converter and a plurality of battery packs as described in any one of claims 1 to 10, wherein the power converter is used to convert external electrical energy into power and output it to the battery pack.

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