Battery pack

Abstract

The utility model provides a battery pack, comprising: a housing having a sealed housing inner cavity filled with a heat exchange medium; the battery cell group module is arranged in the shell inner cavity and comprises a plurality of battery cells; wherein a gap is formed between the battery cell group module and the inner wall of the shell inner cavity, a connecting body which is respectively connected with the battery cell group module and the inner wall of the shell inner cavity is arranged in the gap, and the gap is limited into a snakelike flow channel through the connecting body, and a heat exchange medium flows through the snakelike flow channel. According to the battery pack provided by the invention, the shell is provided with the sealed shell inner cavity, and the connector connected between the battery cell group module and the inner wall of the shell inner cavity not only is beneficial to formation of reliable connection between the battery cell group module and the shell and improvement of the structural stability of the battery pack, but also can play a role in guiding the heat exchange medium flowing into the gap, so that the heat exchange efficiency is improved. And the heat exchange medium is guided to flow in the flow channel according to the preset track, so that the stroke of the heat exchange medium in the inner cavity of the shell can be prolonged, and the heat exchange medium in the flow channel can be subjected to sufficient heat exchange with the battery cell group module.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and more particularly to a battery pack. Background Technology

[0002] The battery pack includes a housing and multiple battery modules housed within the housing. Each battery module includes multiple stacked pouch cells. To maintain the pouch cells within a preset temperature range, the temperature of the battery module needs to be regulated by a heat exchange component.

[0003] However, in battery modules, it is difficult for pouch cells to make close contact with the top cover, which results in a large thermal resistance between the pouch cells and the heat exchange components, and a low heat exchange efficiency. Utility Model Content

[0004] In view of this, the purpose of this application is to propose a battery pack that at least partially solves the problem of low heat exchange efficiency of battery packs.

[0005] To achieve the above objectives, this application provides a battery pack, comprising: a housing having a sealed inner cavity filled with a heat exchange medium; a cell assembly module disposed within the inner cavity, the cell assembly module comprising a plurality of cells; wherein a gap exists between the cell assembly module and the inner wall of the inner cavity, and a connector is disposed in the gap and respectively connected to the cell assembly module and the inner wall of the inner cavity, the connector defining the gap as a serpentine flow channel for the heat exchange medium to flow.

[0006] Optionally, the housing includes a top plate located above the battery cell module and a plate-shaped lower housing located below the battery cell module; the gap includes a first gap between the top plate and the battery cell module, and / or a second gap between the lower housing and the battery cell module, and the connector is disposed in at least the first gap and / or the second gap.

[0007] Optionally, along the first direction, a plurality of connecting bodies are spaced apart in the gap, and adjacent connecting bodies are staggered; the first direction is the straight flow direction of the heat exchange medium in the gap.

[0008] Optionally, in the same side gap, the plurality of connectors include a first connector group and a second connector group spaced apart and alternately arranged along the first direction; the second connector group includes at least two second connectors spaced apart along the second direction, and a flow gap is formed between adjacent two second connectors; the first connector group includes at least one first connector, at least a portion of the first connector being directly opposite the flow gap in the first direction; the second direction intersects the first direction.

[0009] Optionally, the cell assembly module includes at least one cell stack, and each cell stack includes a plurality of cells stacked along a second direction.

[0010] Optionally, the cell assembly module includes a connecting beam and two side plates; the two side plates are disposed on both sides of the cell stack along the second direction, and the two side plates are connected and clamped to fix the cell stack through the connecting beam.

[0011] Optionally, the cell assembly module includes at least two cell stacks spaced apart along the first direction, and the connecting beam is disposed between at least two adjacent cell stacks.

[0012] Optionally, the connecting beam has an inner cavity, and the top and bottom of the connecting beam are respectively provided with beam openings communicating with the inner cavity.

[0013] Optionally, the battery pack further includes a battery management system, which includes multiple slave control boards. Each of the side panels is equipped with a slave control board, and the slave control board is electrically connected to the corresponding cell stack.

[0014] Optionally, the housing includes a plate-shaped lower housing, and the side plates are fixed to the lower housing by fasteners.

[0015] Optionally, the housing includes a first sidewall and a second sidewall disposed opposite to each other along a first direction, and the battery pack includes an inlet connector and an outlet connector. The inlet connector is connected through one of the first sidewall and the second sidewall, and the outlet connector is connected through the other sidewall. The inlet connector and the outlet connector are respectively connected to the inner cavity of the housing.

[0016] Optionally, the battery cell includes a pouch cell.

[0017] Optionally, the connector may include a thermally conductive structural adhesive.

[0018] As can be seen from the above, the battery pack provided in this application has a sealed inner cavity in its outer shell, providing a structural basis for immersion heat exchange of the cell assembly modules. The connector between the cell assembly modules and the inner wall of the inner cavity not only helps to form a reliable connection between the cell assembly modules and the outer shell, thus improving the structural stability of the battery pack, but also guides the heat exchange medium flowing into the gap, directing the heat exchange medium to flow along a preset trajectory in the flow channel. This helps to extend the travel distance of the heat exchange medium in the inner cavity, allowing for more thorough heat exchange between the heat exchange medium and the cell assembly modules within the flow channel.

[0019] Meanwhile, due to the flow characteristics of the heat exchange medium, the heat exchange medium in the inner cavity of the casing can also immerse the tabs of the battery cell and other structural components in the inner cavity of the casing to achieve individual contact heat exchange. This can effectively control the temperature of the tabs and the aforementioned structural components, which not only helps to improve the heat exchange efficiency of the battery pack, but also helps to ensure the temperature consistency of the battery cells and various structural components in the battery pack.

[0020] Furthermore, since the battery pack of this application adopts immersion cooling, it can eliminate the need to install liquid cooling plates and pipelines in the inner cavity of the casing, which helps to reduce the material cost of the battery pack and simplify the assembly process. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a partial structural cross-sectional view of the battery pack according to the first structure of this application embodiment;

[0023] Figure 2 This is a perspective view of a battery pack with a second structure according to an embodiment of this application;

[0024] Figure 3 This is a cross-sectional schematic diagram of a battery pack with a second structure according to an embodiment of this application;

[0025] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0026] Figure 5 This is a top view of a battery pack with the top plate removed, representing a second structure according to an embodiment of this application.

[0027] Figure 6 This is a perspective view of a battery pack with the top plate removed, representing the second structure of this application.

[0028] Figure 7 This is a top view schematic diagram of a battery pack with a second structure according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1000, Cell assembly module; 100, Cell stack; 110, Cell; 111, Tab; 200, Side plate; 300, Connecting beam; 310, Beam cavity; 320, Beam opening;

[0031] 2000, Outer shell; 2100, Inner shell cavity; 2200, Second side wall; 2300, Top plate; 2400, Lower shell; 2500, First side wall; 2600, Liquid outlet connector; 2700, Liquid inlet connector;

[0032] 3000, Heat exchanger assembly; 4000, Module top cover; 5000, U-shaped shell;

[0033] 6000, Connector; 6100, First Connector Assembly; 6110, First Connector; 6200, Second Connector Assembly; 6210, Second Connector; 6220, Flow Gap;

[0034] 7000, clearance; 7100, first clearance; 7200, second clearance;

[0035] 8000, enclosure. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0037] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0038] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0039] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0040] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] Figure 1A partial cross-sectional view of the battery pack with the first structure is shown.

[0042] like Figure 1 The battery pack includes a housing 8000 and battery modules placed inside the housing 8000. The battery module includes a U-shaped shell 5000, a module top cover 4000 that covers the top opening of the U-shaped shell 5000, and battery cells 110 disposed inside the module housing 5000.

[0043] In some embodiments, the battery pack includes a heat exchange assembly 3000 (e.g., a liquid cooling plate), which may be disposed above the module top cover 4000. Figure 1 It can be seen that, in order to facilitate the placement of sampling components, a gap of 7000 needs to be reserved between the top of the battery cell 110 and the module top cover 4000. Although the heat exchange component 3000 can achieve contact heat exchange with the module top cover 4000, the heat exchange between the battery cell 110 and the module top cover 4000 can only rely on air, resulting in high thermal resistance and low heat exchange efficiency.

[0044] To address the aforementioned issues, this application provides an alternative battery pack.

[0045] Figure 2 A schematic diagram of the second type of battery pack is shown. Figure 3 A cross-sectional diagram of the second type of battery pack structure is shown. It should be noted that... Figure 3 The dotted pattern in the image represents the heat exchange medium inside the shell cavity 2100.

[0046] like Figure 2 and Figure 3 The battery pack provided in this embodiment includes a housing 2000 with a sealed inner cavity 2100 filled with a heat exchange medium; a cell assembly module 1000 disposed in the inner cavity 2100, the cell assembly module 1000 including a plurality of cells 110; wherein, there is a gap 7000 between the cell assembly module 1000 and the inner wall of the inner cavity 2100, and a connector 6000 disposed in the gap 7000, which is respectively connected to the cell assembly module 1000 and the inner wall of the inner cavity 2100, the connector 6000 defining the gap 7000 as a serpentine flow channel for the heat exchange medium to flow.

[0047] For example, the heat exchange medium can be a liquid or a gas.

[0048] For example, the housing 2000 can be connected to an inlet pipe and an outlet pipe, the inlet pipe being used to inject heat exchange medium into the housing cavity 2100, and the outlet pipe being used to discharge the heat exchange medium after heat exchange in the housing cavity 2100.

[0049] For example, the gap 7000 may be located above, below, or on at least one side of the cell assembly module 1000 in the circumferential direction.

[0050] For example, the connector 6000 can be connected to the battery cell module 1000 and the housing 2000 by means of adhesive bonding, plugging, or snap-fitting.

[0051] Because the outer casing 2000 has a sealed inner cavity 2100, the heat exchange medium can be directly injected into the inner cavity 2100 and achieve contact heat exchange with the battery cell module 1000. It should be noted that since the flowing heat exchange medium fills all the gaps 7000 in the inner cavity 2100 after entering the casing, it can achieve contact heat exchange not only on the top, bottom, side walls and tabs 111 of the battery cell 110, but also on the plates and busbars connected to the tabs 111, which helps to make the temperature of the battery cell module 1000 uniform.

[0052] Meanwhile, the connector 6000 can guide the heat exchange medium flowing into the gap 7000, so that the heat exchange medium can flow in the channel according to a preset trajectory.

[0053] The battery pack provided in this embodiment has a sealed inner cavity 2100 in the outer shell 2000, which provides a structural basis for immersion heat exchange of the cell assembly module 1000. The connector 6000 connecting the cell assembly module 1000 and the inner wall of the inner cavity 2100 not only helps to form a reliable connection between the cell assembly module 1000 and the outer shell 2000, thus improving the structural stability of the battery pack, but also guides the heat exchange medium flowing into the gap 7000, guiding the heat exchange medium to flow in the flow channel according to a preset trajectory. This helps to extend the travel of the heat exchange medium in the inner cavity 2100, allowing for more sufficient heat exchange between the heat exchange medium in the flow channel and the cell assembly module 1000.

[0054] Meanwhile, due to the flow characteristics of the heat exchange medium, the heat exchange medium in the inner cavity 2100 can also immerse the tabs 111 of the battery cell 110 and other structural components (hereinafter referred to as internal structural components, such as busbars or diaphragms) in the inner cavity 2100, so as to achieve individual contact heat exchange for the tabs 111 and the internal structural components. This can effectively control the temperature of the tabs 111 and the internal structural components, which not only helps to improve the heat exchange efficiency of the battery pack, but also helps to ensure the temperature consistency of the battery cell 110 and various structural components in the battery pack.

[0055] Furthermore, since the battery pack in this embodiment uses immersion cooling, it eliminates the need to install liquid cooling plates and pipelines in the inner cavity 2100 of the casing, which helps to reduce the material cost of the battery pack and simplify the assembly process.

[0056] Figure 4Showing Figure 3 An enlarged schematic diagram of part A in the middle.

[0057] like Figure 4 In some embodiments, the housing 2000 includes a portion located above the cell assembly module 1000 (along...) Figure 4 The top plate 2300 (in the Z direction) and the part located below the cell assembly module 1000 (along the Z direction) Figure 4 The lower housing 2400 is a plate-shaped structure (in the opposite direction of the Z direction); the gap 7000 includes a first gap 7100 located between the top plate 2300 and the cell assembly module 1000, and / or a second gap 7200 located between the lower housing 2400 and the cell assembly module 1000, and the connector 6000 is at least disposed in the first gap 7100 and / or the second gap 7200.

[0058] For example, when the gap 7000 includes the first gap 7100, the connector 6000 is at least disposed in the first gap 7100; when the gap 7000 includes the second gap 7200, the connector 6000 is at least disposed in the second gap 7200; when the gap 7000 includes the first gap 7100 and the second gap 7200, the connector 6000 may be disposed in the first gap 7100, or disposed in the second gap 7200, or disposed in both the first gap 7100 and the second gap 7200.

[0059] For example, the housing 2000 may include a lower housing 2400 and an upper housing, each having a flange and being able to achieve a sealed connection via fasteners such as bolts. The upper housing may include a top plate 2300.

[0060] For example, the lower housing 2400 may form a protruding structure protruding from its surface, the protruding structure supporting the battery cell assembly module 1000 to form a second gap 7200 between the battery cell assembly module 1000 and the lower housing 2400.

[0061] In this embodiment, the tops of all the battery cells 110 stacked in the inner cavity 2100 are close to the first gap 7100. That is, when the heat exchange medium flows through the first gap 7100, it can cover the tops of all the battery cells 110 in the inner cavity 2100. Correspondingly, the bottoms of all the battery cells 110 are close to the second gap 7200. Therefore, by placing the connector 6000 in the first gap 7100 or the second gap 7200, the heat exchange medium can flow through all the battery cells 110 during its flow in the flow channel, which helps to improve the utilization rate of the heat exchange medium and the heat exchange effect of the battery pack.

[0062] If the connector 6000 is placed in the first gap 7100 and the second gap 7200, in addition to achieving the above-mentioned beneficial effects, it can also enable the top and bottom of the battery cell 110 to simultaneously contact the heat exchange medium for heat exchange, which helps to make the temperature of the battery cell 110 more uniform.

[0063] Figure 5 This diagram shows a top view of the second battery pack structure after removing the top plate 2300. It should be noted that... Figure 5 The dashed arrows in the diagram represent the flow trajectory of the heat exchange medium.

[0064] like Figure 4 and Figure 5 In some embodiments, along the first direction (e.g.) Figure 4 and Figure 5 In the X direction), multiple connectors 6000 are arranged at intervals in the gap 7000, and adjacent connectors 6000 are staggered; the first direction is the straight flow direction of the heat exchange medium in the gap 7000.

[0065] For example, taking the first gap 7100 as an example, the setting range of the connector 6000 in the first gap 7100 covers the top of the cell assembly module 1000.

[0066] For example, the first direction may be the same as or intersect with the stacking direction of the cells 110 in the cell assembly module 1000.

[0067] Multiple connectors 6000 are spaced apart and staggered. When the heat exchange medium flows through the flow channel formed by these connectors 6000, it needs to flow in a serpentine manner to form a longer flow channel in the limited space of the inner cavity 2100, thereby effectively improving the utilization rate of the heat exchange medium and the heat exchange effect of the battery pack.

[0068] like Figure 4 and Figure 5 In some embodiments, within the same side gap 7000 (e.g., in the first gap 7100), a plurality of connectors 6000 include a first connector group 6100 and a second connector group 6200 spaced apart and alternately arranged along a first direction; the second connector group 6200 includes connectors arranged along a second direction (e.g., in the first gap 7100). Figure 5 At least two second connectors 6210 are spaced apart in the Y direction, and a flow gap 6220 is formed between two adjacent second connectors 6210; the first connector group 6100 includes at least one first connector 6110, at least a portion of the first connector 6110 is directly opposite the flow gap 6220 in the first direction; the second direction intersects the first direction.

[0069] For example, in the inner cavity 2100, the distribution of connectors 6000 in the gaps 7000 on different sides can be the same or different. For example, the distribution of connectors 6000 in the first gap 7100 and the distribution of connectors 6000 in the second gap 7200 can be the same or different.

[0070] For example, at least two second connectors 6210 in the same second connector group 6200 may be aligned or misaligned along the second direction.

[0071] For example, along the first direction, the first connector 6110 or the second connector 6210 may be located at the beginning of the plurality of connectors 6000. Similarly, the first connector 6110 or the second connector 6210 may be located at the end of the plurality of connectors 6000.

[0072] For example, along the first direction, the first connector 6110 is located at the beginning, which can divert the heat exchange medium injected into the inner cavity 2100 of the shell, so that the heat exchange medium flows in a serpentine manner as soon as possible after entering the inner cavity 2100. The second connector 6210 is located at the end, which can merge the diverted heat exchange medium in the inner cavity 2100 through the flow gap 6220, so that the heat exchange medium flows out of the outer shell 2000 from the same position, which helps to reduce the impact of the heat exchange medium on the outer shell 2000.

[0073] by Figure 5 Taking the structure shown as an example for further explanation, when the heat exchange medium flows along the first direction to the first connector group 6100, it needs to turn and bypass the first connector 6110 along the second direction due to the obstruction of the first connector 6110. After bypassing the first connector 6110, if the heat exchange medium flows along the first direction, it will be blocked by the second connector 6210 in the downstream second connector group 6200. At this time, the heat exchange medium needs to turn and bypass the second connector 6210 along the second direction and pass through the flow gap 6220 to continue flowing downstream. Therefore, under the action of the alternately arranged first connector group 6100 and second connector group 6200, the heat exchange medium can flow in a serpentine manner in the gap 7000, thereby effectively improving the utilization rate of the heat exchange medium and the heat exchange effect of the battery pack.

[0074] like Figure 5 In some embodiments, the cell assembly module 1000 includes at least one cell stack 100, each cell stack 100 including a plurality of cells 110 stacked along a second direction.

[0075] For example, when the battery cell module 1000 includes at least two battery cell stacks 100, the at least two battery cell stacks 100 can be spaced apart along a first direction.

[0076] In this embodiment, the stacking direction of the battery cells 110 in the battery cell stack 100 intersects with the flow direction of the heat exchange medium, which allows the heat exchange medium to cover all the battery cells 110 in the battery cell stack 100 at the same time. This helps to make the heat exchange effect of the heat exchange medium on all the battery cells 110 in the same battery cell stack 100 more consistent, and helps to improve the temperature consistency of all the battery cells 110 in the same battery cell stack 100.

[0077] Figure 6 A partial schematic diagram of the second battery pack structure after removing the top plate 2300 is shown.

[0078] like Figure 5 and Figure 6 In some embodiments, the cell assembly module 1000 includes a connecting beam 300 and two side plates 200; the two side plates 200 are disposed on both sides of the cell stack 100 along a second direction; the two side plates 200 are connected and clamped to fix the cell stack 100 by the connecting beam 300.

[0079] For example, the connecting beam 300 may be disposed above, below or along the first direction on the side of the cell stack 100.

[0080] For example, the connecting beam 300 can be connected to the side plate 200 by means of plug-in, snap-fit, adhesive connection, bolt connection or welding.

[0081] Two side plates 200 disposed on opposite sides of the cell stack 100 can clamp the cell stack 100 and provide preload to keep the multiple cells 110 in the cell stack 100 in a stacked state. A connecting beam 300 can provide tension to the two side plates 200 to maintain a preset interval between them. Under the action of the side plates 200 and the connecting beam 300, the multiple cells 110 in the cell assembly module 1000 can be constructed as a whole, facilitating the assembly and transportation of the cell assembly module 1000.

[0082] Meanwhile, since the side plate 200 is arranged along the second direction and extends along the first direction, it can prevent the side plate 200 from obstructing or blocking the heat exchange medium flowing along the first direction, which helps to ensure the heat exchange effect of the battery pack.

[0083] like Figure 5 and Figure 6 In some embodiments, the cell assembly module 1000 includes at least two cell stacks 100 spaced apart along a first direction, and a connecting beam 300 is disposed between at least two adjacent cell stacks 100.

[0084] Based on the foregoing, it can be understood that the flow channels formed in the first gap 7100 and the second gap 7200 can achieve a better heat exchange effect. In order to avoid the connecting beam 300 from obstructing the flow of the heat exchange medium, this embodiment abandons the scheme of setting the connecting beam 300 in the first gap 7100 and the second gap 7200, and instead sets it between two adjacent cell stacks 100 to ensure that the heat exchange medium can flow relatively smoothly in the flow channels of the first gap 7100 and the second gap 7200, thereby ensuring the heat exchange effect of the battery pack.

[0085] Meanwhile, along the first direction, the connecting beam 300 may not be provided between the inner wall of the cell stack 100 and the inner cavity 2100. When the heat exchange medium enters the inner cavity 2100, it can act directly on the cell 110 in the cell stack 100 without being blocked by the connecting beam 300, which helps to further improve the heat exchange effect of the battery pack.

[0086] like Figure 3 and Figure 6 In some embodiments, the connecting beam 300 is provided with a beam cavity 310, and the top and bottom of the connecting beam 300 are respectively provided with beam openings 320 communicating with the beam cavity 310.

[0087] For example, one or more beam cavities 310 may be provided. When multiple beam cavities 310 are provided, the beam openings 320 at the top of the connecting beam 300 are provided one-to-one with the beam cavities 310, and the beam openings 320 at the bottom of the connecting beam 300 are also provided one-to-one with the beam cavities 310. Adjacent beam cavities 310 may be interconnected or isolated from each other.

[0088] Combination Figure 3 It can be seen that there are battery cells 110 on both sides of the connecting beam 300 along the first direction. Since the gap 7000 between the battery cells 110 and the connecting beam 300 is small, if the connecting beam 300 has a longitudinal (along) direction to the heat exchange medium... Figure 3 If the Z-direction flow is significantly obstructed, the heat exchange effect in the area of ​​cell 110 near the connecting beam 300 may be poor.

[0089] To avoid the aforementioned problems, in this embodiment, the beam opening 320 at the top of the connecting beam 300, the beam cavity 310, and the beam opening 320 at the bottom of the connecting beam 300 can be configured as channels for the flow of heat exchange medium, thereby reducing the obstruction of the connecting beam 300 to the longitudinally flowing heat exchange medium. The heat exchange medium flowing in the first gap 7100 can smoothly enter the second gap 7200 through this channel, and similarly, the heat exchange medium in the second gap 7200 can also enter the first gap 7100 through this channel. During the longitudinal flow of the heat exchange medium, it can achieve more efficient heat exchange with the area of ​​the battery cell 110 near the connecting beam 300, thereby improving the heat exchange effect of the battery pack and helping to improve the temperature consistency of the battery cell module 1000.

[0090] like Figure 5 and Figure 6 In some embodiments, the battery pack also includes a battery management system, which includes multiple slave control boards. Each side plate 200 is equipped with a slave control board, and the slave control board is electrically connected to the corresponding cell stack 100.

[0091] For example, the slave control board connected to the same side plate 200 corresponds one-to-one with the battery cell stack 100.

[0092] For example, the control panel and side panel 200 can be connected by adhesive, snap-fit ​​or fasteners (e.g., bolts).

[0093] The slave control board is electrically connected to multiple cells 110 in the corresponding cell stack 100, enabling it to collect voltage and temperature data of each connected cell 110 and perform real-time monitoring. The slave control board can also communicate with the main control board in the battery management system, allowing it to send data to or receive control commands from the main control board.

[0094] The slave control board is connected to the side plate 200, and the side plate 200 can fix the slave control board so that it can be held in a preset position in the inner cavity 2100 of the housing and form a reliable connection with the battery cell 110 and / or other devices. At the same time, in this embodiment, it is possible to eliminate the need to set a fixing bracket for the slave control board in the battery pack, which helps to improve the internal space utilization of the battery pack and increase the energy density of the battery pack.

[0095] Figure 7 A top-view schematic diagram of the second type of battery pack is shown.

[0096] like Figure 7In some embodiments, the housing 2000 includes a first sidewall 2500 and a second sidewall 2200 disposed opposite to each other along a first direction. The battery pack includes an inlet connector 2700 and an outlet connector 2600. The inlet connector 2700 is connected through one of the first sidewall 2500 and the second sidewall 2200, and the outlet connector 2600 is connected through the other. The inlet connector 2700 and the outlet connector 2600 are respectively connected to the inner cavity 2100 of the housing.

[0097] For example, the first sidewall 2500 and the second sidewall 2200 may be connected to the top plate 2300.

[0098] For example, the first sidewall 2500 can be a flat plate, a stepped plate, or a curved plate. Similarly, the second sidewall 2200 can also be one of the above-mentioned types of plates.

[0099] The external pipeline can be connected to the inner cavity 2100 through the liquid inlet connector 2700 and the liquid outlet connector 2600. The heat exchange medium can flow into the inner cavity 2100 through the liquid inlet connector 2700, flow in the inner cavity 2100 along the first direction, and be discharged through the liquid outlet connector 2600 and flow away through the external pipeline.

[0100] In this embodiment, the liquid inlet connector 2700 and liquid outlet connector 2600 are arranged in the same direction as the flow direction of the heat exchange medium in the inner cavity 2100 of the housing. This makes the process of the heat exchange medium flowing into and out of the inner cavity 2100 of the housing smoother. At the same time, it also helps to reduce the impact of the heat exchange medium on the outer shell 2000 and helps to extend the service life of the battery pack.

[0101] like Figure 3 and Figure 4 In some embodiments, cell 110 includes pouch cell.

[0102] When the cell 110 is a pouch cell, it includes tabs 111 extending from the side.

[0103] Specifically, such as Figure 5 Multiple cells 110 in the cell stack 100 are stacked along the second direction; as Figure 3 At this time, the tabs 111 of the battery cell 110 extend in the first direction. When the heat exchange medium flows in the first direction, all the tabs 111 on the same side of the battery cell stack 100 can be heat exchanged simultaneously. This can prevent the tabs 111 on the same side from blocking each other and also help to improve the temperature uniformity of multiple tabs 111 on the same side.

[0104] In some embodiments, the connector 6000 includes a thermally conductive structural adhesive.

[0105] After assembling the battery cell module 1000, thermally conductive structural adhesive can be applied to a predetermined position on the surface of the battery cell module 1000 or on the inner wall of the shell cavity 2100. Then, before the thermally conductive structural adhesive has cured, the battery cell module 1000 is assembled with the shell 2000. After the thermally conductive structural adhesive has cured to form the connector 6000, the battery cell module 1000 and the shell 2000 can be connected through the connector 6000. Simultaneously, the connector 6000 defines the gap 7000 as a serpentine flow channel for the heat exchange medium to flow.

[0106] like Figure 6 In some embodiments, the housing 2000 includes a plate-shaped lower housing 2400, and the side plates 200 are fixed to the lower housing 2400 by fasteners.

[0107] For example, fasteners can be bolts, screws, or threaded posts.

[0108] Taking the connection of the side plate 200 and the lower housing 2400 by bolts as an example, the bolts pass through the side plate 200, and their lower ends extend out of the side plate 200 and can be threadedly connected to the lower housing 2400. The bolt nuts can abut against the side plate 200, so that the side plate 200 and the lower housing 2400 are fitted and fixed, thereby realizing the connection and fixation between the battery cell module 1000 and the outer shell 2000.

[0109] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0110] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0111] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0112] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0113] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The outer shell has a sealed inner cavity filled with a heat exchange medium; A battery cell module is disposed in the inner cavity of the shell, and the battery cell module includes multiple battery cells; There is a gap between the battery cell module and the inner wall of the shell cavity. A connector is provided in the gap, which is connected to the battery cell module and the inner wall of the shell cavity respectively. The connector defines the gap as a serpentine flow channel for the heat exchange medium to flow.

2. The battery pack according to claim 1, characterized in that, The outer casing includes a top plate located above the battery cell module and a plate-shaped lower casing located below the battery cell module; the gap includes a first gap between the top plate and the battery cell module, and / or a second gap between the lower casing and the battery cell module, and the connector is disposed in at least the first gap and / or the second gap.

3. The battery pack according to claim 1, characterized in that, Along the first direction, a plurality of connecting bodies are spaced apart in the gap, and adjacent connecting bodies are staggered; the first direction is the straight flow direction of the heat exchange medium in the gap.

4. The battery pack according to claim 3, characterized in that, In the same side gap, the plurality of connectors include a first connector group and a second connector group that are spaced apart and alternately arranged along the first direction; the second connector group includes at least two second connectors that are spaced apart along the second direction, and a flow gap is formed between two adjacent second connectors; the first connector group includes at least one first connector, and at least a portion of the first connector is directly opposite the flow gap in the first direction. The second direction intersects with the first direction.

5. The battery pack according to claim 1, characterized in that, The cell assembly module includes at least one cell stack, and each cell stack includes a plurality of cells stacked along a second direction.

6. The battery pack according to claim 5, characterized in that, The cell assembly module includes a connecting beam and two side plates; the two side plates are disposed on both sides of the cell stack along the second direction, and the two side plates are connected and clamped to fix the cell stack through the connecting beam.

7. The battery pack according to claim 6, characterized in that, The cell assembly module includes at least two cell stacks spaced apart along a first direction, and the connecting beam is disposed between at least two adjacent cell stacks.

8. The battery pack according to claim 6, characterized in that, The connecting beam has an inner cavity, and the top and bottom of the connecting beam are respectively provided with beam openings that communicate with the inner cavity.

9. The battery pack according to claim 6, characterized in that, The battery pack also includes a battery management system, which includes multiple slave control boards. Each of the side panels is equipped with a slave control board, and the slave control board is electrically connected to the corresponding cell stack.

10. The battery pack according to claim 6, characterized in that, The outer casing includes a plate-shaped lower casing, and the side plates are fixed to the lower casing by fasteners.

11. The battery pack according to claim 1, characterized in that, The outer casing includes a first sidewall and a second sidewall disposed opposite to each other along a first direction. The battery pack includes an inlet connector and an outlet connector. The inlet connector is connected through one of the first sidewall and the second sidewall, and the outlet connector is connected through the other sidewall. The inlet connector and the outlet connector are respectively connected to the inner cavity of the casing.

12. The battery pack according to claim 1, characterized in that, The battery cells include pouch cells.

13. The battery pack according to claim 1, characterized in that, The connector includes a thermally conductive structural adhesive.

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