Battery pack

Abstract

The present application provides a battery pack, comprising: a housing having a sealed housing inner cavity, the housing inner cavity having a cavity top and a cavity bottom; the battery cell group module is arranged in the inner cavity of the shell, and the battery cell group module comprises a connecting beam, two side plates and a plurality of battery cell stacking bodies; the plurality of battery cell stacking bodies are arranged along a first direction, and each battery cell stacking body comprises a plurality of battery cells stacked along a second direction; the connecting beams are at least arranged between two adjacent battery cell stacking bodies; the two side plates are located on the two sides, distributed in the second direction, of the battery cell stacking body, and the two side plates are connected through the connecting beam and clamp and fix the battery cell stacking body; a first flow gap is formed between the cell stack and the cavity top, a second flow gap is formed between the connecting beam and the cavity bottom, and the first flow gap and the second flow gap form a continuous snake-shaped flow channel for a heat exchange medium to flow along a first direction. According to the battery pack provided by the invention, the connecting beam can play a role in guiding the heat exchange medium flowing in the inner cavity of the shell, so that the heat exchange efficiency of the battery pack can be improved.

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] Based on the above objectives, this application provides a battery pack, comprising: a housing having a sealed inner cavity, the inner cavity having a top and a bottom, the inner cavity being filled with a heat exchange medium; a cell assembly module disposed within the inner cavity, the cell assembly module including a connecting beam, two side plates, and multiple cell stacks; the multiple cell stacks being arranged along a first direction, each cell stack including multiple cells stacked along a second direction, the first direction intersecting the second direction; the connecting beam being disposed between at least two adjacent cell stacks; the two side plates being located on both sides of the cell stack distributed along the second direction, the two side plates being connected and clamped to fix the cell stack by the connecting beam; wherein, the cell stack is sealed to the bottom of the cavity, a first flow gap is formed between the cell stack and the top of the cavity; the connecting beam is sealed to the top of the cavity, a second flow gap is formed between the connecting beam and the bottom of the cavity, the first flow gap and the second flow gap communicating to form a continuous serpentine flow channel for the heat exchange medium to flow along the first direction.

[0006] Optionally, each of the battery cells includes a tab disposed at an end along the first direction, and a third flow gap is formed between the tab and the connecting beam, wherein the first flow gap communicates with the second flow gap through the third flow gap.

[0007] Optionally, along a third direction, the bottom of the connecting beam that defines the second flow gap is close to the bottom of the tab; the third direction is the height direction of the cell stack.

[0008] Optionally, along the third direction, the bottom of the connecting beam extends beyond the bottom of the electrode lug.

[0009] Optionally, along the second direction, the second flow gap is either continuously or intermittently provided from one end of the connecting beam to the other.

[0010] Optionally, the connecting beam and the outer shell are independent structural components, and the connecting beam is welded or glued to the top of the cavity.

[0011] Optionally, each of the battery cell stacks is provided with a connecting beam at both ends along the first direction.

[0012] 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.

[0013] Optionally, the housing includes a plate-shaped lower housing, and the side plates are fixed to the lower housing by fasteners.

[0014] Optionally, the housing includes an inlet connector, an outlet connector, and a first sidewall and a second sidewall disposed opposite to each other along the first direction. 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.

[0015] Optionally, the battery cell includes a pouch cell.

[0016] 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 connecting beam can provide tension to the two side plates, enabling the two side plates to clamp multiple stacked cells, facilitating the overall assembly and transportation of the cell assembly modules. Simultaneously, the connecting beam is also sealed to the top of the cavity, guiding the flow of the heat exchange medium within the inner cavity. This allows the heat exchange medium to flow up and down in a serpentine pattern along the continuous second and first flow gaps, helping to extend the travel distance of the heat exchange medium within the inner cavity. This allows for more thorough heat exchange between the heat exchange medium and various areas of the cell, contributing to improved heat exchange efficiency of the battery pack.

[0017] Meanwhile, the stacking direction of the cells in the cell stack intersects with the flow direction of the heat exchange medium, which allows the heat exchange medium to cover all the cells in the cell stack at the same time. This helps to make the heat exchange effect of the heat exchange medium on all the cells in the same cell stack more consistent, and helps to improve the temperature consistency between different areas of the same cell stack.

[0018] 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

[0019] 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.

[0020] Figure 1 This is a partial cross-sectional schematic diagram of the battery pack according to the first structure of this application embodiment;

[0021] Figure 2 This is a schematic diagram of a battery pack with a second structure according to an embodiment of this application;

[0022] Figure 3 This is a partial cross-sectional schematic diagram of the battery pack with the second structure according to an embodiment of this application;

[0023] Figure 4 for Figure 3 An enlarged schematic diagram of part A in the middle;

[0024] Figure 5 This is a partial top view of the interior of a battery pack according to a second structure in this application embodiment;

[0025] Figure 6 This is a schematic diagram of the connecting beam of the battery pack according to the second structure of this application embodiment;

[0026] Figure 7 This is a schematic diagram of another connecting beam for a battery pack with a second structure according to an embodiment of this application;

[0027] Figure 8 This is a schematic diagram of the upper casing of a battery pack with a second structure according to an embodiment of this application;

[0028] Figure 9 This is a partial cross-sectional schematic diagram of the battery pack with the third structure according to an embodiment of this application;

[0029] Figure 10 This is a partial top view of the interior of a battery pack according to a third structure in this application embodiment;

[0030] Figure 11 This is a top view schematic diagram of a battery pack with a second structure according to an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1000, Cell assembly module; 100, Cell stack; 110, Cell; 111, Tab; 200, Side plate; 300, Connecting beam;

[0033] 2000, Outer shell; 2100, Lower shell; 2200, Inner cavity of the shell; 2210, Top of the cavity; 2220, Bottom of the cavity; 2230, First flow gap; 2240, Second flow gap; 2250, Third flow gap; 2300, Top plate; 2400, First side wall; 2500, Second side wall; 2600, Inlet connector; 2700, Outlet connector;

[0034] 3000, Heat exchange components; 4000, Module top cover; 5000, U-shaped shell; 6000, Housing; 7000, Gap. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Figure 1 A partial cross-sectional schematic diagram of the battery pack with the first structure is shown.

[0041] like Figure 1 The battery pack includes a housing 6000 and multiple battery modules placed inside the housing 6000. Each 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 U-shaped shell 5000.

[0042] 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.

[0043] To address the aforementioned issues, this application provides an alternative battery pack.

[0044] Figure 2 A schematic diagram of the second type of battery pack is shown. Figure 3 A partial cross-sectional diagram of the second type of battery pack is shown. Figure 4 Showing Figure 3 An enlarged diagram of part A. It should be noted that... Figure 3 The dotted pattern in the image represents the heat exchange medium in the inner cavity 2200 of the shell, and the dashed arrows represent the flow trajectory of the heat exchange medium.

[0045] like Figure 2 , Figure 3 and Figure 4 The battery pack provided in this embodiment includes: a shell 2000, a sealed inner cavity 2200, the inner cavity 2200 having a top 2210 and a bottom 2220, and the inner cavity 2200 being filled with a heat exchange medium.

[0046] Figure 5 A partial top view of the interior of the battery pack with the second structure is shown.

[0047] like Figure 3 and Figure 5 The battery pack also includes: a cell assembly module 1000, disposed in the inner cavity 2200 of the casing; the cell assembly module 1000 includes a connecting beam 300, two side plates 200, and multiple cell stacks 100; the multiple cell stacks 100 are arranged along a first direction (e.g., Figure 5 The cells are arranged in the X direction, and each cell stack 100 includes multiple cells arranged along the second direction (e.g., the X direction). Figure 5The cells 110 are stacked in the Y direction, with the first direction intersecting the second direction; the connecting beam 300 is disposed between at least two adjacent cell stacks 100; the two side plates 200 are located on both sides of the cell stack 100 distributed along the second direction, and the two side plates 200 are connected and clamped to fix the cell stack 100 through the connecting beam 300 to provide preload force for the cell stack 100.

[0048] like Figure 3 and Figure 4 The cell stack 100 is sealed to the bottom of the cavity 2220, and a first flow gap 2230 is formed between the cell stack 100 and the top of the cavity 2210; the connecting beam 300 is sealed to the top of the cavity 2210, and a second flow gap 2240 is formed between the connecting beam 300 and the bottom of the cavity 2220. The first flow gap 2230 and the second flow gap 2240 are connected to form a continuous serpentine flow channel for the heat exchange medium to flow in the first direction.

[0049] For example, the heat exchange medium can be a liquid or a gas.

[0050] 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 2200, and the outlet pipe being used to discharge the heat exchange medium after heat exchange in the housing cavity 2200.

[0051] For example, the cell stack 100 can be sealed to the cavity bottom 2220 of the housing 2000 by adhesive bonding. The connecting beam 300 can be sealed to the cavity top 2210 of the housing 2000 by adhesive bonding or welding.

[0052] For example, the outer casing 2000 may include a lower casing 2100 and an upper casing, each of which is provided with a flange and can be sealed together by fasteners such as bolts. The top of the cavity 2210 may be located on the inner side of the upper casing (i.e., the side of the upper casing close to the inner cavity 2200), and the bottom of the cavity 2220 may be located on the inner side of the lower casing 2100.

[0053] 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.

[0054] The connecting beam 300 can provide tension to the two side plates 200, so that the two side plates 200 disposed on opposite sides of the cell stack 100 can clamp the cell stack 100, ensuring that the multiple cells 110 in the cell stack 100 remain stacked. 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 into a whole, which facilitates the assembly and transportation of the cell assembly module 1000.

[0055] 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.

[0056] Since the outer shell 2000 has a sealed inner cavity 2200, the heat exchange medium can be directly injected into the inner cavity 2200 and achieve contact heat exchange with the battery cell module 1000.

[0057] Combination Figure 3 and Figure 4 The structure and orientation shown are illustrated by way of example. During the flow of the heat exchange medium in the inner cavity 2200 along the first direction, the heat exchange medium flowing within the first flow gap 2230 can exchange heat with the top of the battery cell 110. When the heat exchange medium flows to the connecting beam 300, it will be blocked by the connecting beam 300 and needs to flow downwards (…). Figure 4 The heat transfer medium (flowing in the positive Z direction) is redirected to bypass the connecting beam 300 through the second flow gap 2240. During the flow of the heat transfer medium between the first flow gap 2230 and the second flow gap 2240, heat can be exchanged on the sidewalls of the battery cell 110. The heat transfer medium bypassing the connecting beam 300 is then blocked by the battery cell stack 100 and needs to flow upwards (…). Figure 4 The flow reverses in the Z direction to bypass the cell stack 100 through the first flow gap 2230. In summary, the heat exchange medium can flow up and down in a serpentine manner in the inner cavity 2200 under the action of the connecting beam 300 and the cell stack 100. During the flow, contact heat exchange can be achieved on multiple surfaces of the cell 110.

[0058] The battery pack provided in this embodiment has a sealed inner cavity 2200 in the outer shell 2000, providing a structural basis for immersion heat exchange of the cell assembly module 1000. The connecting beam 300 can provide tension to the two side plates 200, so that the two side plates 200 can clamp multiple cell stacks 100, facilitating the overall assembly and transportation of the cell assembly module 1000. At the same time, the connecting beam 300 is also sealed to the top of the cavity 2210, which can guide the heat exchange medium flowing in the inner cavity 2200, so that the heat exchange medium flows up and down in a serpentine manner along the continuous second flow gap 2240 and the first flow gap 2230. This helps to extend the travel of the heat exchange medium in the inner cavity 2200, allowing for more sufficient heat exchange between the heat exchange medium and each area of ​​the cell 110, thus improving the heat exchange efficiency of the battery pack.

[0059] Meanwhile, 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 between different regions of the same battery cell stack 100.

[0060] 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 2200 of the casing, which helps to reduce the material cost of the battery pack and simplify the assembly process.

[0061] like Figure 3 and Figure 4 In some embodiments, each cell 110 includes a tab 111 disposed at an end along a first direction, and a third flow gap 2250 is formed between the tab 111 and the connecting beam 300. The first flow gap 2230 is connected to the second flow gap 2240 through the third flow gap 2250.

[0062] For example, tab 111 can be connected to a bar or busbar.

[0063] After flowing out of the first flow gap 2230, the heat exchange medium can enter the third flow gap 2250 under the guidance of the connecting beam 300. During the flow of the heat exchange medium in the third flow gap 2250, it can conduct contact heat exchange with the tabs 111 of the battery cell 110. At the same time, when the tabs 111 are connected to other structural components (hereinafter referred to as internal structural components, such as busbars or diaphragms), the heat exchange medium flowing in the third flow gap 2250 can also immerse the internal structural components and achieve individual contact heat exchange with them, which can effectively control the temperature of the internal structural components and further improve the temperature consistency of the battery cell module 1000.

[0064] After the heat exchange medium flows out of the third flow gap 2250, it can enter the second flow gap 2240 and flow to the next cell stack 100 until it flows out of the inner cavity 2200.

[0065] It should also be noted that when the heat exchange medium flows along the first direction, all the tabs 111 on the same side of the cell stack 100 can be contacted and 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.

[0066] like Figure 4 In some embodiments, along a third direction (e.g.) Figure 4The bottom of the connecting beam 300, which defines the second flow gap 2240, is near the bottom of the tab 111; the third direction is the height direction of the cell stack 100.

[0067] For example, along the length direction of the connecting beam 300 (i.e., the second direction), the entire bottom of the connecting beam 300 is spaced apart from the cavity bottom 2220 to define the second flow gap 2240; or, a portion of the bottom of the connecting beam 300 is spaced apart from the cavity bottom 2220, and another portion of the bottom contacts the cavity bottom 2220.

[0068] For example, along a third direction, the bottom of the connecting beam 300 that defines the second flow gap 2240 (hereinafter referred to as the spacer bottom of the connecting beam 300) is located above, below, or flush with the bottom of the tab 111.

[0069] As described above, the heat exchange medium needs to bypass the bottom of the connecting beam 300 through the second flow gap 2240 and flow upwards to the first flow gap 2230 during its flow. Therefore, if the bottom of the connecting beam 300's gap is close to the bottom of the tab 111, the heat exchange medium, after bypassing the bottom of the connecting beam 300's gap, will flow upwards from the position close to the bottom of the tab 111, and then enter the first flow gap 2230 after passing through the tab 111. Therefore, setting the bottom of the connecting beam 300's gap close to the bottom of the tab 111 allows the heat exchange medium's path to cover most of the tab 111, thus facilitating more sufficient contact heat exchange with the tab 111, enabling more effective control of the tab 111's temperature and improving the battery pack's heat exchange efficiency.

[0070] like Figure 4 In some embodiments, along a third direction, the bottom of the connecting beam 300 extends beyond the bottom of the tab 111.

[0071] In this embodiment, the connecting beam 300 extends from top to bottom beyond the bottom of the tab 111. When the heat exchange medium passes through the second flow gap 2240 around the bottom of the connecting beam 300, it is located below the bottom of the tab 111 and enters the third flow gap 2250 from there. During its flow in the third flow gap 2250, it can flow through the entire area of ​​the tab 111, which helps to further achieve sufficient contact heat exchange with the tab 111 and further improve the heat exchange efficiency of the battery pack.

[0072] It should be noted that, for the bottom of the gap of the connecting beam 300, when it extends from top to bottom beyond the bottom of the tab 111, it is still close to the tab 111. This is because if the bottom of the gap of the connecting beam 300 is too close to the bottom of the cavity 2220, it will cause the second flow gap 2240 to be too small, which is not conducive to the flow of the heat exchange medium.

[0073] Figure 6 A schematic diagram of the connecting beam 300 of the battery pack with the second structure is shown.

[0074] like Figure 6 In some embodiments, along the second direction, the second flow gap 2240 is continuously provided from one end of the connecting beam 300 to the other end.

[0075] The second flow gap 2240 is continuously provided from one end of the connecting beam 300 to the other, which helps to increase the overall longitudinal cross-sectional area of ​​the second flow gap 2240. This allows the heat exchange medium in the inner cavity 2200 to pass through the second flow gap 2240 more smoothly during the flow along the first direction, ensuring heat exchange efficiency. At the same time, in this embodiment, the orthogonal projection of the second flow gap 2240 along the first direction on the cell stack 100 can intersect with all the cells 110 in the cell stack 100. That is, the heat exchange medium passing through the second flow gap 2240 can synchronously exchange heat with all the cells 110 in the same cell stack 100, which helps to improve the temperature uniformity of the cell stack 100.

[0076] Figure 7 A schematic diagram of another connecting beam 300 for the second type of battery pack is shown.

[0077] like Figure 7 In some embodiments, along the second direction, the second flow gap 2240 is intermittently provided from one end of the connecting beam 300 to the other end.

[0078] When the length of the connecting beam 300 along the second direction is long, the middle position of the connecting beam 300 may sag due to its own weight, which will cause the size of the second flow gap 2240 near the middle position along the third direction to shrink.

[0079] To address this issue, this embodiment provides an intermittent arrangement of the second flow gap 2240. Along the second direction, the bottom portion of the connecting beam 300 contacts the cavity bottom 2220. While this portion does not define the second flow gap 2240, it provides support for the connecting beam 300, ensuring that the longitudinal cross-sectional area of ​​the second flow gap 2240 defined by the connecting beam 300 meets the design requirements.

[0080] Figure 8 A schematic diagram of the upper casing of the battery pack with the second structure is shown.

[0081] like Figure 5 and Figure 8 In some embodiments, the connecting beam 300 and the outer shell 2000 are independent structural components, and the connecting beam 300 is welded or glued to the cavity top 2210.

[0082] In this embodiment, the connecting beam 300 is not connected to the cavity top 2210 before the upper and lower housings 2100 are assembled.

[0083] The connection method between the connecting beam 300 and the cavity top 2210 is illustrated using adhesive bonding as an example. After the battery cell module 1000 and the lower housing 2100 are assembled, and before assembling the upper housing and lower housing 2100, an adhesive (e.g., thermally conductive structural adhesive) can be applied to the top of the connecting beam 300. The upper housing and lower housing 2100 are then assembled before the adhesive cures. Once the adhesive has cured, a sealed connection between the connecting beam 300 and the cavity top 2210 is achieved.

[0084] like Figure 3 and Figure 5 Connecting beams 300 can be omitted at the beginning and end of the cell assembly module 1000 along the first direction. After entering the inner cavity 2200, the heat exchange medium can act directly on the first cell stack 100 without bypassing the connecting beams 300. Reducing the number of connecting beams 300 helps to lower the material cost and assembly difficulty of the battery pack, which is beneficial for mass production.

[0085] Figure 9 A partial cross-sectional diagram of the third type of battery pack is shown. Similarly, Figure 9 The dotted pattern in the image represents the heat exchange medium in the inner cavity 2200 of the shell, and the dashed arrows represent the flow trajectory of the heat exchange medium. Figure 10 A partial top view of the interior of the battery pack with the third structure is shown.

[0086] like Figure 9 and Figure 10 In some embodiments, each of the cell stacks 100 has a connecting beam 300 arranged at both ends along the first direction.

[0087] Combination Figure 9 The structure and orientation shown are illustrated using the cell stack 100 near the left side wall of the inner cavity 2200 as an example. In this embodiment, a connecting beam 300 (hereinafter referred to as the first-end connecting beam) is also provided between the cell stack 100 and the left side wall of the inner cavity 2200. Regardless of where the inlet of the heat exchange medium is located in the third direction, the heat exchange medium entering the inner cavity 2200 must pass through the second flow gap 2240 formed by the first-end connecting beam to continue flowing in the first direction. That is, the first-end connecting beam can force the heat exchange medium entering the inner cavity 2200 to flow upward from below the tab 111, thereby enabling contact heat exchange in a larger area of ​​the tab 111. This also allows for greater flexibility in designing the inlet and outlet positions of the heat exchange medium.

[0088] like Figure 5In 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.

[0089] For example, the slave control board connected to the same side plate 200 corresponds one-to-one with the battery cell stack 100.

[0090] For example, the control panel and side panel 200 can be connected by adhesive, snap-fit ​​or fasteners (e.g., bolts).

[0091] 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.

[0092] 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 2200 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.

[0093] Figure 11 A top-view schematic diagram of the second type of battery pack is shown.

[0094] like Figure 11 In some embodiments, the housing 2000 includes an inlet connector 2600, an outlet connector 2700, and a first sidewall 2400 and a second sidewall 2500 disposed opposite to each other along a first direction. The inlet connector 2600 is connected through one of the first sidewall 2400 and the second sidewall 2500, and the outlet connector 2700 is connected through the other. The inlet connector 2700 and the outlet connector 2600 are respectively connected to the inner cavity 2200 of the housing.

[0095] For example, the first sidewall 2400 and the second sidewall 2500 can be used to construct an upper housing.

[0096] For example, the first sidewall 2400 can be a flat plate, a stepped plate, or a curved plate. The second sidewall 2500 can also be any of the above structures, which will not be described in detail here.

[0097] For example, along a third direction, the liquid inlet connector 2600 can be positioned near the middle or lower part of the tab 111. In this case, even without a front connecting beam, after the heat exchange medium enters the shell cavity 2200 through the liquid inlet connector 2600, contact heat exchange can be performed on a larger area of ​​the tab 111. Similarly, the liquid outlet connector 2700 can also be positioned near the middle or lower part of the tab 111.

[0098] External piping can be connected to the inner cavity 2200 through inlet connector 2600 and outlet connector 2700. The heat exchange medium can flow into the inner cavity 2200 through inlet connector 2600. After flowing in the inner cavity 2200 to outlet connector 2700, the heat exchange medium can be discharged from the inner cavity 2200 through outlet connector 2700.

[0099] In this embodiment, the liquid inlet connector 2600 and liquid outlet connector 2700 are arranged in the same direction as the flow direction of the heat exchange medium in the inner cavity 2200 of the housing. This makes the process of the heat exchange medium flowing into and out of the inner cavity 2200 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.

[0100] like Figure 3 and Figure 5 In some embodiments, the housing 2000 includes a plate-shaped lower housing 2100, and the side plates 200 are fixed to the lower housing 2100 by fasteners.

[0101] For example, fasteners can be bolts, screws, or threaded posts.

[0102] In this embodiment, the side plate 200 of the cell stack 100 can be connected to the lower shell 2100 of the outer shell 2000 by clamping the side plate 200, which eliminates the process of assembling the cell stack 100 into a battery module. This not only reduces the number of battery pack components and material costs, simplifies the assembly process, and improves assembly efficiency, but also helps to increase the energy density of the battery pack.

[0103] Taking the connection of the side plate 200 and the lower housing 2100 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 2100. The bolt nuts can abut against the side plate 200, so that the side plate 200 and the lower housing 2100 fit and are fixed together, thereby realizing the connection and fixation between the battery cell module 1000 and the outer shell 2000.

[0104] In some embodiments, cell 110 includes pouch cell.

[0105] The two side plates 200 can clamp the multiple cells 110 stacked in the cell stack 100. Even if the cell 110 is a soft-pack cell, the multiple soft-pack cells in the cell stack 100 can be kept stacked, which is convenient for assembly and transportation.

[0106] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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, the inner cavity having a top and a bottom, and the inner cavity being filled with a heat exchange medium; A cell assembly module is disposed within the inner cavity of the shell. The cell assembly module includes a connecting beam, two side plates, and multiple cell stacks. The multiple cell stacks are arranged along a first direction, and each cell stack includes multiple cells stacked along a second direction, the first direction intersecting the second direction. The connecting beam is disposed between at least two adjacent cell stacks. The two side plates are located on both sides of the cell stacks distributed along the second direction, and the two side plates are connected and clamped to fix the cell stacks through the connecting beam. The battery cell stack is sealed to the bottom of the cavity, and a first flow gap is formed between the battery cell stack and the top of the cavity; the connecting beam is sealed to the top of the cavity, and a second flow gap is formed between the connecting beam and the bottom of the cavity; the first flow gap and the second flow gap are connected to form a continuous serpentine flow channel for the heat exchange medium to flow along the first direction.

2. The battery pack according to claim 1, characterized in that, Each of the battery cells includes a tab disposed at an end along the first direction, and a third flow gap is formed between the tab and the connecting beam, the first flow gap communicating with the second flow gap through the third flow gap.

3. The battery pack according to claim 2, characterized in that, Along a third direction, the bottom of the connecting beam that defines the second flow gap is close to the bottom of the tab; the third direction is the height direction of the cell stack.

4. The battery pack according to claim 3, characterized in that, Along the third direction, the bottom of the connecting beam extends beyond the bottom of the electrode lug.

5. The battery pack according to claim 1, characterized in that, Along the second direction, the second flow gap is either continuously or intermittently provided from one end of the connecting beam to the other.

6. The battery pack according to claim 1, characterized in that, The connecting beam and the outer shell are independent structural components, and the connecting beam is welded or glued to the top of the cavity.

7. The battery pack according to claim 1, characterized in that, Each of the cell stacks is provided with a connecting beam at both ends along the first direction.

8. The battery pack according to claim 1, 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.

9. The battery pack according to claim 1, characterized in that, The outer casing includes a plate-shaped lower casing, and the side plates are fixed to the lower casing by fasteners.

10. The battery pack according to claim 1, characterized in that, The outer shell includes an inlet connector, an outlet connector, and a first sidewall and a second sidewall disposed opposite to each other along the first direction. 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 shell.

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

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