Battery pack and battery liquid cooling unit

Abstract

The application relates to a battery pack and a battery liquid cooling unit. The battery pack comprises a battery box and a plurality of battery liquid cooling units. The plurality of battery liquid cooling units are arranged in the battery box in sequence along a first direction. Each battery liquid cooling unit comprises a liquid cooling plate, a bonding part and a battery pack. The bonding part bonds the liquid cooling plate and the battery pack. The battery pack comprises a plurality of battery monomers arranged side by side along a second direction. The liquid cooling plate comprises a wing plate and a web plate, and the web plate is vertically arranged on one side of the wing plate along a third direction. Each battery monomer is supported on the wing plate and is in heat conduction connection with the web plate. Each battery liquid cooling unit is detachably installed on the battery box through the liquid cooling plate. The first direction, the second direction and the third direction intersect with each other and are not coplanar. The technical scheme of the application can simplify the disassembly of the battery pack and reduce the replacement cost of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and a battery liquid cooling unit. Background Technology

[0002] With the increasing adoption of new energy batteries and the retirement of early-installed batteries, removable battery technology has risen from an industry demand to a strategic necessity. Its importance is closely related to environmental pressures, economic benefits, and sustainable industrial development. Currently, the mainstream solution for mass-produced new energy battery packs is to use large-area structural adhesive bonding between the cells and the liquid cooling plate, making disassembly difficult. Furthermore, the liquid cooling plate is integrated into the bottom of the battery pack and cannot be removed. When the bottom of the battery pack is damaged, replacing the entire liquid cooling plate and disassembling the battery cells would significantly increase costs and be highly uneconomical, often resulting in the battery pack being scrapped. Utility Model Content

[0003] Therefore, it is necessary to provide a battery pack and battery liquid cooling unit to address the issue of high battery pack replacement costs.

[0004] In a first aspect, this application proposes a battery pack, comprising:

[0005] Battery box;

[0006] Multiple battery liquid cooling units are arranged sequentially within the battery box along a first direction. Each battery liquid cooling unit includes a liquid cooling plate, an adhesive part, and a battery pack. The adhesive part detachably bonds the liquid cooling plate and the battery pack. The battery pack includes multiple battery cells arranged side by side along a second direction. The liquid cooling plate includes a wing plate and a web plate. The web plate is erected on one side of the wing plate along a third direction. Each battery cell is supported by the wing plate and thermally connected to the web plate.

[0007] Each of the battery liquid cooling units is detachably installed in the battery box via the liquid cooling plate, and the first direction, the second direction, and the third direction intersect each other but are not coplanar.

[0008] In some embodiments, the bonding strength of the adhesive portion does not exceed 3 MPa.

[0009] In some embodiments, in each of the battery packs, the individual battery cells are bonded to the web via a first adhesive portion and / or to the wing via a second adhesive portion, wherein the first adhesive portion and the second adhesive portion are double-sided adhesive or thermally conductive adhesive.

[0010] In some embodiments, the battery pack is disposed beyond the edge of the wingplate along the first direction.

[0011] In some embodiments, the web is disposed at the middle of the wing, and the battery pack is thermally connected to both opposite sides of the web.

[0012] In some embodiments, the included angle α between the wing and the web is 88° to 92°.

[0013] In some embodiments, the liquid cooling plate includes a reinforcing plate disposed on the side of the wing facing away from the web.

[0014] In some embodiments, an insulating sheet is provided between each two adjacent battery cells in each battery pack.

[0015] In some embodiments, the web and the wing form a flow channel portion of the liquid cooling plate, and the flow channel portion is open at at least one end in the second direction;

[0016] The liquid cooling plate further includes a flow collection section, which includes a recessed cavity arranged along the second direction. The open end of the flow channel is sealed and inserted into the recessed cavity. A water nozzle communicating with the flow channel is provided on the flow collection section.

[0017] In some embodiments, the current collector is provided with a disassembly / removal part that is detachably connected to the battery box.

[0018] In some embodiments, the disassembly / assembly part includes a disassembly / assembly hole disposed in the current collection part, the disassembly / assembly hole being isolated from the cavity, and the disassembly / assembly hole being disposed through the third direction; along the third direction, the projection of the disassembly / assembly hole falls within the projection range of the cavity; the disassembly / assembly hole is disposed in a strip shape along the first direction.

[0019] In some embodiments, the liquid cooling plate further includes a buffer pad disposed on the side of the current collector facing away from the battery pack in a third direction.

[0020] In some embodiments, the battery pack further includes end plates that are clamped along the first direction on opposite sides of all the battery liquid cooling units, and the end plates are detachably connected to the battery case.

[0021] In some embodiments, the battery pack further includes a support pad disposed between the wing plates of all the battery liquid cooling units and the battery housing.

[0022] In some embodiments, the battery pack includes the end plate;

[0023] Each of the end plates includes an intersecting first plate portion and a second plate portion, wherein the first plate portion is arranged along the first direction between the second plate portion and the battery liquid cooling unit, and at least one of the first plate portion and the second plate portion is detachably connected to the battery box; and / or,

[0024] The battery pack also includes a buffer component disposed between the end plate and the battery liquid cooling unit. The buffer component includes an insulating layer and a buffer layer connected to each other. The insulating layer is bonded to the battery liquid cooling unit, and the buffer layer is bonded to the end plate.

[0025] In some embodiments, the end plate includes a first plate portion and a second plate portion, both of which are provided with mounting holes. A first fastener passes through each of the mounting holes and is detachably connected to the battery box to fix the first plate portion and the second plate portion to the battery box.

[0026] In some embodiments, the battery pack further includes a signal acquisition assembly, which includes a tray and an electrical connector. The tray is located on the side of all the battery liquid cooling units away from the wing plate, and the electrical connector is located on the side of the tray away from the battery liquid cooling units and is detachably connected to the terminal post of the battery cell.

[0027] In some embodiments, the electrical connector is provided with a through hole, and the pole is provided with a second fastener. The second fastener passes through the through hole and is threadedly connected to a fastening nut. The fastening nut locks the second fastener and the electrical connector.

[0028] In some embodiments, the tray is provided with a vent hole, which is disposed opposite to the explosion-proof valve of the battery cell.

[0029] In some embodiments, the battery pack further includes a piping assembly, which includes an inlet pipe and an outlet pipe, and each of the liquid cooling plates is independently connected to the inlet pipe and the outlet pipe.

[0030] In some embodiments, both the inlet pipe and the outlet pipe include a telescopic pipe and a connector connected to the liquid cooling plate, with adjacent connectors connected via the telescopic pipe.

[0031] Secondly, this application proposes a battery liquid cooling unit, including a liquid cooling plate, an adhesive part, and a battery pack. The adhesive part detachably bonds the liquid cooling plate and the battery pack. The battery pack includes a plurality of battery cells arranged side by side along a second direction. The liquid cooling plate includes a wing plate and a web plate. The web plate is erected on one side of the wing plate along a third direction. Each battery cell is supported on the wing plate and thermally connected to one side of the web plate in a first direction.

[0032] The liquid cooling plate has a disassembly and assembly part for detachable installation in the battery box, wherein the first direction, the second direction, and the third direction intersect each other but are not coplanar.

[0033] Compared to the traditional method of bonding liquid cooling plates and battery packs with structural adhesive, the battery pack and liquid cooling unit described in this application are composed of multiple liquid cooling units. The bonding method between the individual battery cells and the liquid cooling plate within each liquid cooling unit is detachable, allowing for easy separation by peeling off the adhesive. This allows for easy separation of the individual battery cells and liquid cooling plate after disassembly. Once a new liquid cooling plate is replaced, the cells can be reassembled to form the liquid cooling unit and reinstalled in the battery box, significantly simplifying battery pack assembly and disassembly, reducing battery pack replacement costs, and facilitating battery pack reuse.

[0034] In addition, the liquid cooling plate exchanges heat with the bottom and sides of the battery cell through the web and wing plates respectively. The liquid cooling plate has a large heat exchange area with the battery cell, resulting in good heat exchange effect. It can effectively regulate the operating temperature of the battery cell and improve the service life of the battery pack. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0036] Figure 1 This is a partial structural diagram of a battery pack according to some embodiments;

[0037] Figure 2 for Figure 1 An exploded view of the battery pack shown;

[0038] Figure 3 This is a schematic diagram of the structure of a battery liquid cooling unit in some embodiments (with some individual battery cells hidden);

[0039] Figure 4 This is a cross-sectional schematic diagram of a battery liquid cooling unit in some embodiments;

[0040] Figure 5 This is a cross-sectional schematic diagram of the battery liquid cooling unit in some other embodiments;

[0041] Figure 6 These are schematic diagrams of the liquid cooling plates in some embodiments;

[0042] Figure 7 for Figure 6 An exploded view of the liquid cooling plate is shown.

[0043] Figure 8This is a schematic diagram of the lower casing of the battery box in some embodiments;

[0044] Figure 9 These are schematic diagrams of the endplate structure in some embodiments;

[0045] Figure 10 for Figure 1 Enlarged view of point A in the middle.

[0046] The reference numerals in the detailed embodiments are as follows:

[0047] 1000, Battery pack; X, First direction; Y, Second direction; Z, Third direction; 100, Battery box; 101, Connection hole; 102, Mounting beam; 103, Lower box; 200, Battery liquid cooling unit; 210, Battery pack; 211, Battery cell; 211a, Terminal post; 211b, Explosion-proof valve; 220, Liquid cooling plate; 221, Flow channel; 221a, Wing plate; 221b, Web plate; 222, Current collector; 222a, Cavity; 222b, Water nozzle; 222c, Disassembly / assembly section; c1, Disassembly / assembly hole; c2, Disassembly / assembly post; 223, Reinforcing plate; 224, Buffer pad; 230, Adhesive part; 231, First adhesive part; 232, Second adhesive part; 300, End plate; 310, First plate part; 320, Second plate part; 300c, Mounting hole; J1, First fastener; 400, Support pad; 500, Buffer; 501, Insulation layer; 502, Buffer layer; 600, Signal acquisition assembly; 610, Electrical connector; 620, Support plate; 621, Vent hole; J2, Second fastener; J3, Fastening nut; J4, Washer; 700, Piping assembly; 701, Inlet pipe; 702, Outlet pipe; 700a, Connector; 700b, Telescopic pipe. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] Furthermore, where applicable, the terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0054] To reduce the cost of battery pack replacement, this application proposes a battery pack embodiment.

[0055] The battery cell involved in the embodiments of this application is the smallest unit in which an electrochemical reaction takes place in a battery, and can be a secondary battery or a primary battery. The battery cell can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes.

[0056] In some embodiments, the battery cell includes a housing, an end cap, and an electrode assembly. The housing and the end cap together form an internal space for accommodating the electrode assembly. Specifically, a receiving cavity may be formed within the housing, with at least one end open. The end cap closes to the open end of the housing to seal the receiving cavity, and the electrode assembly is mounted within the receiving cavity. The housing may be, but is not limited to, a metal housing, such as an aluminum housing or a steel housing.

[0057] Electrode assemblies typically include a positive electrode, a negative electrode, and a separator separating the positive and negative electrodes. An electrolyte can be injected into the battery cell, wetting the interior of the electrode assembly and providing ion migration pathways for electrochemical reactions, as well as conducting electricity. Electrode assemblies can be in the form of wound, stacked, etc. One or more electrode assemblies can be installed within a battery cell. Both the positive and negative electrodes have tabs.

[0058] Each battery cell has terminals that are electrically connected to the tabs of an electrode assembly, allowing the assembly to be connected to an external circuit. Battery cells typically have explosion-proof valves to release pressure when the internal pressure exceeds a certain threshold, preventing the cell from exploding.

[0059] The battery pack proposed in the embodiments of this application will be described in detail below.

[0060] Please refer to Figure 1 , Figure 2 and Figure 3The battery pack 1000 proposed in this application includes a battery case 100 and a plurality of battery liquid cooling units 200. The plurality of battery liquid cooling units 200 are arranged sequentially within the battery case 100 along a first direction X. Each battery liquid cooling unit 200 includes a liquid cooling plate 220, an adhesive portion 230, and a battery pack 210. The adhesive portion 230 adhesively bonds the liquid cooling plate 220 and the battery pack 210. The battery pack 210 includes a plurality of battery cells 211 arranged side-by-side along a second direction Y. The liquid cooling plate 220 includes a wing plate 221a and a web plate 221b, with the web plate 221b erected on one side of the wing plate 221a along a third direction Z. Each battery cell 211 is supported on the wing plate 221a and thermally connected to the web plate 221b. Each battery liquid cooling unit 200 is detachably mounted to the battery case 100 via the liquid cooling plate 220. The first direction X, the second direction Y, and the third direction Z intersect each other but are not coplanar.

[0061] In practical applications, the battery box 100 is a rectangular box, with the third direction Z being the height direction of the battery box 100, the first direction X being the length direction of the battery box 100, and the second direction Y being the width direction of the battery box 100. Along the length direction of the battery box 100, multiple battery liquid cooling units 200 are arranged sequentially and independently mounted on the bottom of the battery box 100 via their own liquid cooling plates 220.

[0062] Understandably, both the wing plate 221a and the web plate 221b are heat exchange plates, and both have flow channels inside. These flow channels can be interconnected or independent of each other. The web plate 221b is erected above the wing plate 221a, and its shape relative to the wing plate 221a can be approximately L-shaped, inverted T-shaped, etc. The wing plate 221a and the web plate 221b intersect to form a heat exchange space that is thermally connected to both sides of the battery pack 210. The wing plate 221a and the web plate 221b can be integrally formed or separately connected. Specifically, if the wing plate 221a and the web plate 221b are L-shaped, there is one heat exchange space, which is arranged on one side of the web plate 221b. If the wing plate 221a and the web plate 221b are inverted T-shaped, there are two heat exchange spaces, which are arranged on opposite sides of the web plate 221b. Each heat exchange space typically contains one row of battery packs 210.

[0063] The battery pack 210 consists of multiple battery cells 211 arranged side-by-side along the second direction Y. Adjacent battery cells 211 can be fixedly connected (e.g., bonded), or they can be simply in contact. Alternatively, an intermediate structure can be provided between adjacent battery cells 211 to stabilize their relative positions. In practical applications, the battery pack 210 is placed on a wing plate 221a. The sides of the battery pack 210 are in thermal contact with the web plate 221b, and the bottom surface is in thermal contact with the wing plate 221a. The liquid cooling plate 220 exchanges heat with each battery cell 211 in the battery pack 210 through the web plate 221b and the wing plate 221a.

[0064] Generally, the battery cell 211 is a prismatic cell. In this case, the side surface of each battery cell 211 along the first direction X is the large surface and is connected to the plane of the web 221b. Optionally, the battery cell 211 is a cylindrical cell, and the battery cell 211 is connected to the arc surface of the web 221b. That is, the planar features of the web 221b can be adaptively adjusted according to the shape of the battery cell 211 so that the web 221b and the side surface of the battery cell 211 have a large contact area. The battery cells 221 in the same battery pack 200 can be in direct thermal contact or connected through an intermediate structure.

[0065] The adhesive portion 230 detachably bonds the battery pack 210 and the liquid cooling plate 220, allowing the battery pack 210 to be torn apart from the liquid cooling plate 220. It is made of a material with low adhesive strength. The battery pack 210 is fixed to the liquid cooling plate 220 by the adhesive portion 230, and the specific bonding location is not limited. Generally, to improve the positional stability of each battery cell 211, each battery cell 211 is bonded to the liquid cooling plate 220. Optionally, the battery cells 211 in the battery pack 210 are fixedly connected, and some battery cells 211 are bonded to the liquid cooling plate 220.

[0066] Specifically, each liquid cooling plate 220 is provided with a disassembly / removal part 222c, and each liquid cooling plate 220 can be independently and detachably installed on the battery box 100 through the disassembly / removal part 222c. The disassembly / removal part 222c can be a snap-fit ​​part, a fastening part, etc., and its specific form and arrangement position can be flexibly designed and are not limited here.

[0067] When assembling the battery pack 1000, multiple battery cells 211 are sequentially bonded to the liquid cooling plate 220 in a side-by-side order to form a battery liquid cooling unit 200. Then, the multiple battery liquid cooling units 200 are arranged adjacent to each other along the length of the battery box 100, and the liquid cooling plates 220 of each battery liquid cooling unit 200 are fixed to the battery box 100. When the battery box 100 is subjected to external impact, causing some liquid cooling plates 220 to deform under stress, resulting in blockage or leakage in their flow channels, or when some battery cells 211 are damaged, the problematic battery liquid cooling unit 200 can be removed from the battery box 100. Then, the battery cell 211 (or battery pack 210) can be separated from the liquid cooling plate 220, and the problematic component can be replaced or repaired.

[0068] Compared to the traditional method of bonding the liquid cooling plate 220 and the battery pack 210 together with structural adhesive, the present application's solution uses a detachable adhesive bonding method between the battery cell 211 and the liquid cooling plate 220, making it easy to separate them by tearing off the adhesive. Thus, after removing the battery liquid cooling unit 200, the battery cell 211 and the liquid cooling plate 220 can be easily separated. After replacing the liquid cooling plate 220, they can be reassembled to form the battery liquid cooling unit 200 and installed back into the battery box 100, greatly simplifying the disassembly and assembly of the battery pack 1000, reducing the replacement cost of the battery pack 1000, and facilitating the reuse of the battery pack 1000.

[0069] In addition, the liquid cooling plate 220 exchanges heat with the bottom and side surfaces of the battery cell 211 through the web plate 221b and the wing plate 221a respectively. The liquid cooling plate 220 has a large heat exchange area with the battery cell 211 and a good heat exchange effect, which can effectively regulate the working temperature of the battery cell 211 and improve the service life of the battery pack 1000.

[0070] In some embodiments, to facilitate the separation of the liquid cooling plate 220 and the battery pack 210, the strength of the adhesive portion 230 does not exceed 3 MPa. Further optionally, the strength of the adhesive portion 230 does not exceed 2 MPa. The measurement of the adhesive strength of the adhesive portion 230 can be determined according to the specific type of the bonded materials, using a matching national or industry standard; no specific method is limited here.

[0071] It is worth noting that the bonding of the battery pack 210 and the liquid cooling plate 220 not only simplifies the structure of the battery liquid cooling unit 200 and ensures that the two are effectively fixed, but also allows the bonding part 230 to be wetted with solvents such as alcohol when separating the battery pack 210 and the liquid cooling plate 220, so that the battery pack 210 and the liquid cooling plate 220 can be separated without damage, and the separation difficulty is low.

[0072] In some embodiments, refer to Figure 3 Each battery pack 210, battery cell 211 is bonded to the web 221b via the first adhesive portion 231 and / or to the wing 221a via the second adhesive portion 232.

[0073] In other words, each battery cell 211 in the battery pack 210 can be selectively bonded to at least one of the web plate 221b and the wing plate 221a to achieve a fixed connection between the battery pack 210 and the liquid cooling plate 220. The first bonding portion 231 and the second bonding portion 232 can be made of double-sided adhesive, thermally conductive adhesive, etc. Understandably, both the first bonding portion 231 and the second bonding portion 232 are thermally conductive.

[0074] In practical applications, multiple battery cells 211 are sequentially bonded to the web plate 221b and / or the wing plate 221a along the second direction Y to assemble the battery liquid cooling unit 200, making the assembly of the battery liquid cooling unit 200 convenient and simple.

[0075] Preferably, the first adhesive portion 231 and the second adhesive portion 232 are double-sided adhesive or thermally conductive adhesive. More preferably, the thickness of the double-sided adhesive is 0.1-2 mm. This thickness range balances adhesion and thermal conductivity without excessively occupying internal space in the battery case 100, and is easy to remove for simplified assembly and disassembly. More preferably, the thickness of the thermally conductive adhesive is 0.2-5 mm. This thickness range balances adhesion and thermal conductivity without excessively occupying internal space in the battery case 100, and is easy to remove for simplified assembly and disassembly. More preferably, the thermal conductivity can be 0.5-5 W / (m*k), providing good thermal conductivity. In an optional embodiment, the first adhesive portion 231 is double-sided adhesive, and the second adhesive portion 232 is thermally conductive adhesive.

[0076] It is worth noting that when the embodiments of this application involve a range of values, the endpoints of the range share a single unit.

[0077] In some embodiments, the battery pack 210 and the wing 221a are flush at their edges in the first direction X.

[0078] Combination Figure 4 If the liquid cooling plate 220 is an L-shaped plate, the web plate 221b is bonded to the battery cell 211 along one side of the first direction X via the first adhesive portion 231. In this case, in the first direction X, the width B of the wing plate 221a, the width A of the web plate 221b, the thickness C of the first adhesive portion 231, and the width D of the battery cell 211 satisfy: B = A + C + D.

[0079] Combination Figure 5 Understandably, if the liquid cooling plate 220 is an inverted T-shaped plate, the web plate 221b is bonded to the battery cell 211 via the first adhesive portion 231 on both opposite sides along the first direction X. In this case, in the first direction X, the width B2 of the wing plate 221a, the width A of the web plate 221b, the thickness C of the first adhesive portion 231, and the width D of the battery cell 211 satisfy: B = A + 2C + 2D.

[0080] When the edge of the battery pack 210 in the first direction X is flush with the edge of the wing plate 221a in the first direction X, the contact area between the wing plate 221a and the battery pack 210 is large, the heat exchange effect is good, and the wing plate 221a provides greater support to the battery pack 210.

[0081] In other embodiments, the battery pack 210 is positioned beyond the edge of the wing 221a along a first direction X.

[0082] Combination Figure 4Understandably, if the liquid cooling plate 220 is an L-shaped plate, the web plate 221b is bonded to the battery cell 211 along one side of the first direction X via the first adhesive portion 231. In this case, in the first direction X, the width B of the wing plate 221a, the width A of the web plate 221b, the thickness C of the first adhesive portion 231, and the width D of the battery cell 211 satisfy: B < A + C + D.

[0083] Combination Figure 5 Understandably, if the liquid cooling plate 220 is an inverted T-shaped plate, the web plate 221b is bonded to the battery cell 211 via the first adhesive portion 231 on both opposite sides along the first direction X. In this case, in the first direction X, the width B2 of the wing plate 221a, the width A of the web plate 221b, the thickness C of the first adhesive portion 231, and the width D of the battery cell 211 satisfy: B < A + 2C + 2D.

[0084] When the battery pack 210 extends beyond the edge of the wing plate 221a along the first direction X, the portion of the battery pack 210 extending beyond the wing plate 221a can effectively contact the battery pack 210 of the adjacent battery liquid cooling unit 200. The side of the battery pack 210 away from the web plate 221b can be cooled or heated by other battery packs 210, making the temperature of the battery pack 210 more uniform and also helping to improve the heat exchange efficiency of the liquid cooling plate 220.

[0085] Specifically, preferably, the thickness E of the wing plate 221a along the third direction Z is ≤20mm to prevent the liquid cooling plate 220 from occupying too much space in the third direction Z. The width A of the web plate 221b is ≤15mm to prevent the liquid cooling plate 220 from occupying too much space in the first direction X. The height H of the web plate 221b along the third direction Z does not exceed the height of the battery pack 210. Reducing the height of the web plate 221b reduces the amount of material used, reduces the amount of heat exchange medium used, ensures that the liquid cooling plate 220 is in full contact with the battery pack 210 at all points, and improves the heat exchange efficiency.

[0086] In some embodiments, refer to Figure 5 and Figure 6 The web plate 221b is located in the middle of the wing plate 221a, and battery packs 210 are thermally connected to both opposite sides of the web plate 221b. In other words, the web plate 221b and the wing plate 221a form an inverted T-shaped liquid cooling plate 220. At this point, both sides of the web plate 221b can exchange heat with the battery packs 210, resulting in high heat exchange efficiency for the liquid cooling plate 220. Furthermore, two battery packs 210 can be installed on the same liquid cooling plate 220. With the same number of battery packs 210, the number of liquid cooling plates 220 can be reduced, lowering costs and accelerating the assembly speed of the battery box 100.

[0087] In some embodiments, refer to Figure 4 and Figure 5Understand that the included angle α between the wing plate 221a and the web plate 221b is 88° to 92°. If the liquid cooling plate 220 is an inverted T-shaped plate (e.g....), Figure 4 As shown, the angle between the web 221b and the wing 221a located on one side of it is α, and the angle between the web 221b and the half located on the other side of it is 180°-α. Theoretically, the wing 221a is perpendicular to the web 221b, that is, α is 90°.

[0088] At this point, the included angle α between the wing plate 221a and the web plate 221b is allowed to be between 88° and 92°, which can reduce the machining accuracy of the liquid cooling plate 220 and simplify its machining. Moreover, when the included angle α is between 88° and 92°, the wing plate 221a and the web plate 221b are approximately perpendicular, and both can have good surface contact with the battery cell 211, ensuring good heat exchange between the liquid cooling plate 220 and the battery pack 210.

[0089] In some embodiments, refer to Figure 6 The liquid cooling plate 220 includes a reinforcing plate 223, which is located on the side of the wing plate 221a away from the web plate 221b.

[0090] Generally, the wing plate 221a and the web plate 221b are integrally connected, and their wall thicknesses are equal. If the wall thicknesses are too large, the space occupied by the web plate 221b in the first direction X will be too large, reducing the space for the battery pack 210 and hindering the increase in the capacity of the battery pack 1000. Therefore, the wall thicknesses of the wing plate 221a and the web plate 221b are usually designed to be small. If the liquid cooling plate 220 is made of a material with low structural strength, the thin-walled wing plate 221a is prone to deformation when supporting the heavy battery pack 210, resulting in poor contact between the battery pack 210 and the wing plate 221a and reduced heat exchange efficiency. In this case, a reinforcing plate 223 is added to the bottom of the wing plate 221a to increase the strength of the wing plate 221a, so that the wing plate 221a can effectively support the battery pack 210, preventing the wing plate 221a from being deformed by the battery pack 210, improving the ability of the wing plate 221a to resist deformation when the bottom of the battery pack 1000 is impacted, and reducing the risk of damage to the liquid cooling plate 220.

[0091] The reinforcing plate 223 and the wing plate 221a can be fixed together by welding, bonding, or fastening. Optionally, the reinforcing plate 223 can be bonded to the wing plate 221a, which is convenient for assembly, low in cost, and separable for easy reuse. The reinforcing plate 223 can be made of high-strength metals, polymer composite materials, etc. The thickness of the reinforcing plate 223 should not be too large, otherwise it will occupy too much internal space of the battery box 100. The thickness of the reinforcing plate 223 should also not be too small, otherwise the reinforcement effect will be poor. Preferably, the thickness of the reinforcing plate 223 is 0.5-10mm. At this thickness, the reinforcement effect of the reinforcing plate 223 is good, and it will not occupy too much internal space of the battery box 100.

[0092] Of course, in other embodiments, if the strength of the wing plate 221a is sufficient, the reinforcing plate 223 may not be required.

[0093] Generally, the wing plate 221a extends beyond the reinforcing plate 223 along the first direction X, or the edge of the wing plate 221a in the first direction X is flush with the edge of the reinforcing plate 223 in the first direction X, that is, the reinforcing plate 223 does not extend beyond the wing plate 221a along the first direction X. This saves on the material of the reinforcing plate 223 on the one hand, and avoids the reinforcing plate 223 protruding, which would prevent the battery pack 210 of the adjacent battery liquid cooling unit 200 from having effective thermal contact.

[0094] In some embodiments, in each battery pack 210, an insulating sheet (not shown) is provided between every two adjacent battery cells 211. The insulating sheet is used for high-temperature insulation and shielding of adjacent battery cells 211, preventing thermal failure from spreading between adjacent battery cells 211 and improving the safety of the battery pack 1000. Specifically, the insulating sheet can be a mica sheet, and its thickness can be designed to be 0.2-5mm.

[0095] In some embodiments, combined with Figure 6 and Figure 7 It is understood that the web 221b and the wing 221a constitute the flow channel portion 221 of the liquid cooling plate 220, and at least one end of the flow channel portion 221 is open in the second direction Y. The liquid cooling plate 220 also includes a flow collecting portion 222, which includes a cavity 222a recessed along the second direction Y. The open end of the flow channel portion 221 is sealed and inserted into the cavity 222a, and a water nozzle 222b communicating with the flow channel portion 221 is provided on the flow collecting portion 222.

[0096] The cavity 222a faces the flow channel 221, and the open end of the flow channel 221 is inserted into the cavity 222a. The cavity 222a connects the flow channel inside the flow channel 221 and the water nozzle 222b. The collector 222 seals the open end of the flow channel 221. To improve the sealing performance between the collector 222 and the flow channel 221, the junction between the collector 222 and the flow channel 221 can be welded after the flow channel 221 is assembled into the cavity 222a.

[0097] The water nozzle 222b connects the flow channel 221 to the external pipeline, allowing the heat exchange medium to flow within the liquid cooling plate 220. The outer diameter of the water nozzle 222b can be designed within the range of 8-20mm to match suitable pipelines. The flow resistance and velocity of the heat exchange medium are moderate, and the heat exchange medium can effectively exchange heat with the battery pack 210 when flowing through the liquid cooling plate 220, resulting in high heat exchange efficiency.

[0098] In one configuration, the flow channel 221 is open at only one end, and the liquid cooling plate 220 is equipped with a manifold 222, which has two water nozzles 222b for water inlet and outlet, respectively. In another configuration, the flow channel 221 is open at both ends, and the liquid cooling plate 220 is equipped with two manifolds 222, each manifold 222 having one water nozzle 222b, with the two water nozzles 222b on the two manifolds 222 for water inlet and outlet, respectively.

[0099] In practical applications, the flow section and the flow collection section 222 are processed separately and assembled to obtain the liquid cooling plate 220, which simplifies the processing cost and process of the liquid cooling plate 220.

[0100] In some embodiments, refer to Figure 6 The current collector 222 is provided with a disassembly and assembly part 222c that can be detachably connected to the battery box 100. At this time, by setting the disassembly and assembly part 222c on the current collector 222, the liquid cooling plate 220 can be detachably installed on the battery box 100 using the current collector 222, making it easier to process the disassembly and assembly part 222c and simplifying the structure of the liquid cooling plate 220.

[0101] Specifically, in the embodiments, refer to Figure 7 The disassembly / assembly section 222c includes a disassembly / assembly hole c1 located in the collection section 222. The disassembly / assembly hole c1 is isolated from the cavity 222a and is disposed through the cavity in the third direction Z. (Refer to...) Figure 8 In practical applications, the battery box 100 is provided with several connection holes 101. Fasteners are used to pass through the disassembly holes c1 and connect to some of the connection holes 101, so that the current collector 222 can be detachably fixed on the battery box 100, which is convenient and economical to operate.

[0102] In a preferred embodiment, refer to Figure 7 It is understood that, along the third direction Z, the projection of the disassembly hole c1 falls within the projection range of the cavity 222a.

[0103] This can be understood as follows: a disassembly / assembly post c2 is provided on the manifold 222, penetrating the cavity 222a in a third direction Z. The disassembly / assembly post c2 has a disassembly / assembly hole c1. The disassembly / assembly post c2 is sealed to the wall of the cavity 222a (e.g., integrally formed). The wall thickness of the disassembly / assembly post c2 can be designed to be 1-10mm. If the wall thickness of the disassembly / assembly post c2 is too large, it occupies a large space in the cavity 222a, which is not conducive to the flow of the heat exchange medium. If the wall thickness of the disassembly / assembly post c2 is too small, its strength is low and it cannot effectively support the fasteners. When the thickness of the disassembly / assembly post c2 is within the above range, it can ensure strength without affecting the flow of the heat exchange medium.

[0104] At this time, the installation of the disassembly section 222c will not add extra space, and the space occupied by the current collection section 222 can be reduced.

[0105] In an optional embodiment, the mounting / dismounting hole c1 is arranged in a strip shape along the first direction X. Since the battery liquid cooling units 200 are arranged sequentially along the first direction X, designing the mounting / dismounting hole c1 as a waist-shaped hole extending in a strip shape along the first direction X allows for adjustment of the mounting position of the battery liquid cooling units 200 when assembling the battery pack 1000, reducing the precision requirements for the machining position of the mounting / dismounting hole c1. The length of the waist-shaped hole can be designed to be 6-20mm, and the diameter of the arcs on both sides of the waist-shaped hole can be designed to be 2-18mm.

[0106] In some embodiments, refer to Figure 6 and Figure 7 The liquid cooling plate 220 also includes a buffer pad 224, which is disposed on the side of the current collector 222 facing away from the battery pack 210 along the third direction Z. That is, the buffer pad 224 is disposed at the bottom of the current collector 222. The buffer pad 224 is used to absorb vibration energy and prevent the liquid cooling plate 220 from bearing too much mechanical impact, thus playing a buffering role. The material of the buffer pad 224 can be silicone, foam, etc. If the buffer pad 224 is too thick, it will increase the space occupied by the liquid cooling plate 220 in the third direction Z. If the buffer pad 224 is too thin, the buffering effect will be poor. Preferably, the thickness of the buffer pad 224 is within the range of 1-10mm, which meets the requirements for buffering effect and has a reasonable space occupation, which is conducive to improving the internal space utilization of the battery box 100.

[0107] In some embodiments, refer to Figure 1 and Figure 2 The battery pack 1000 also includes an end plate 300, which is clamped along the first direction X on both opposite sides of all the battery liquid cooling units 200. The end plate 300 is detachably connected to the battery box 100.

[0108] In practical applications, after all the battery liquid cooling units 200 are in place, end plates 300 are arranged at both ends of all the battery liquid cooling units 200 in the first direction X. The end plates 300 are used to clamp and position all the battery liquid cooling units 200 in the first direction X, so that the adjacent battery liquid cooling units 200 are in close contact. This improves the temperature uniformity of the battery pack 210 and the installation stability of the battery liquid cooling units 200.

[0109] Generally, to reduce costs, the end plate 300 and the battery box 100 are detachably connected using fasteners such as bolts and screws. Of course, other detachable solutions can also be used. The structural strength of the liquid cooling plate 220 mainly relies on the connection between its disassembly part 222c and the battery box 100, as well as the clamping force of the end plates 300 at both ends.

[0110] In some embodiments, refer to Figure 9Each end plate 300 includes a first plate portion 310 and a second plate portion 320 that are intersecting. The first plate portion 310 is arranged between the second plate portion 320 and the battery liquid cooling unit 200 along a first direction X. At least one of the first plate portion 310 and the second plate portion 320 is detachably connected to the battery box 100.

[0111] Specifically, the first plate portion 310 and the second plate portion 320 generally form an L-shaped structure. The surface area of ​​the first plate portion 310 opposite to the battery liquid cooling unit 200 along the first direction X is larger, so that the clamping force of the end plate 300 acts evenly on the battery liquid cooling unit 200. The other surface of the first plate portion 310 is connected to the second plate portion 320. The function of the second plate portion 320 is to cooperate with the first plate portion 310 to improve the strength of the end plate 300.

[0112] Preferably, the first plate portion 310 and the second plate portion 320 are both detachably connected to the battery box 100, and the end plate 300 is more securely connected to the battery box 100, and its clamping force on the battery liquid cooling unit 200 is more continuous.

[0113] It is worth noting that the dimensions of the first plate portion 310 and the second plate portion 320 in the first direction X are typically designed to be smaller, in order to reduce the space occupied by the end plate 300 in the first direction X and improve the space utilization of the battery box 100. The first plate portion 310 and the second plate portion 320 can be processed from the same profile.

[0114] In the specific embodiments, please refer to... Figure 9 and combined Figure 2 The first plate portion 310 and the second plate portion 320 are both provided with mounting holes 300c. The first fastener J1 passes through each mounting hole 300c and is detachably connected to the battery box 100 to fix the first plate portion 310 and the second plate portion 320 to the battery box 100.

[0115] Specifically, the first plate portion 310 and the second plate portion 320 are arranged with a row of mounting holes 300c along the second direction Y. The mounting holes 300c are arranged through the third direction Z. A portion of the connecting holes 101 on the bottom of the battery box 100 correspond to the mounting holes 300c. The first fastener J1 passes through the mounting holes 300c and is fastened to the connecting holes 101, thereby pressing the first plate portion 310 and the second plate portion 320 onto the battery box 100 and fixing the end plate 300. The first fastener J1 can be a combination of bolts and nuts. The connecting holes 101 on the battery box 100 that mate with the fasteners can be threaded holes.

[0116] Preferably, the mounting hole 300c is an oblong hole extending along the first direction X, and the diameter of the arc at both ends can be designed to be 6-22mm, and the length of the hole can be designed to be 8-24mm.

[0117] To achieve the fixed installation of the liquid cooling plate 220 and the end plate 300, refer to Figure 8 In an optional embodiment, a mounting beam 102 is provided along the bottom perimeter of the battery box 100, and the mounting beam 102 is provided with the aforementioned connection holes 101. The central area enclosed by the mounting beam 102 is used to mount the support pad 400 and the battery liquid cooling unit 200. The height of the mounting beam 102 along the third direction Z is similar to or equal to that of the support pad 400, so that the mounting beam 102 does not raise the liquid cooling plate 220.

[0118] In some embodiments, refer to Figure 2 The battery pack 1000 also includes a buffer 500 disposed between the end plate 300 and the battery liquid cooling unit 200. The buffer 500 includes an insulating layer 501 and a buffer layer 502 connected to each other. The insulating layer 501 is bonded to the battery liquid cooling unit 200, and the buffer layer 502 is bonded to the end plate 300.

[0119] The insulating layer 501 contacts the battery liquid cooling unit 200 and serves to electrically isolate the battery liquid cooling unit 200 from the end plate 300. The insulating layer 501 can be a layer of polymer material, etc. The buffer layer 502 is used to compress the battery liquid cooling unit 200 and absorb the expansion of the battery pack 210. The insulating layer 501 and the buffer layer 502 can be bonded together, for example, with double-sided adhesive. The buffer layer 502 can be made of materials such as foam or silicone.

[0120] In other embodiments, the buffer 500 disposed between the end plate 300 and the battery liquid cooling unit 200 may also consist of only the buffer layer 502.

[0121] In some embodiments, refer to Figure 2 The battery pack 1000 also includes a support pad 400, which is located between the wing plate 221a of the entire battery liquid cooling unit 200 and the battery box 100.

[0122] The support pad 400 supports the battery liquid cooling unit 200. It has a certain degree of elasticity to absorb impact loads. When the bottom of the battery box 100 is subjected to a ball impact, its elasticity protects the liquid cooling plate 220 and prevents deformation. The support pad 400 can be a single unit supporting all battery liquid cooling units 200, or a separate support pad 400 can be provided for each battery liquid cooling unit 200. The support pad 400 can be made of materials such as silicone or foam, and it can be bonded to the battery box 100 using double-sided adhesive or other methods.

[0123] In practical applications, the battery liquid cooling unit 200 is only supported on the support pad 400, and there is no connection structure between it and the support pad 400, which facilitates the arrangement of each battery liquid cooling unit 200 in the box and subsequent disassembly and maintenance.

[0124] Specifically, the support pad 400 is positioned below the end plate 300, or is positioned away from the end plate 300.

[0125] In some embodiments, refer to Figure 1 and Figure 2 The battery pack 1000 also includes a signal acquisition assembly 600, which includes a support plate 620 and an electrical connector 610. The support plate 620 is located on the side of the battery liquid cooling unit 200 away from the wing plate 221a, and the electrical connector 610 is located on the side of the support plate 620 away from the battery liquid cooling unit 200 and is detachably connected to the terminal post 211a of the battery cell 211.

[0126] The signal acquisition assembly 600 (CCS) is used to acquire the operating data of each battery cell 211 in the battery pack 210 to monitor the operation of the battery cells 211. Typically, the signal acquisition assembly 600 also includes acquisition terminals and a main board. The battery pack 1000 also includes a battery management system (BMS). The main board is communicatively connected to the battery management system, the acquisition terminals are electrically connected to the main board, and the acquisition terminals are connected to electrical connectors 610. Operating data (such as voltage and temperature) of the battery pack 210 is acquired through the electrical connectors 610 to monitor the operation of the battery pack 210.

[0127] The tray 620 primarily serves as an isolator and insulator, and can be made of polymer materials such as PE or PI. The electrical connector 610 is conductive and can be made of metal, such as aluminum, copper, or stainless steel. The electrical connector 610 is detachably connected to the terminal 211a, for example, by a detachable snap-fit ​​or plug-in connection; the specific method is not limited.

[0128] At this time, when the battery pack 1000 is unpacked, the electrical connector 610 and the terminal 211a can be separated without damage, which not only simplifies the unpacking process, but also does not damage the structure of the battery pack 210, thereby improving the reusability and maintainability of the battery pack 1000.

[0129] Specifically, in the embodiments, refer to Figure 10 The electrical connector 610 is provided with a through hole (not shown), and the pole post 211a is provided with a second fastener J2. The second fastener J2 passes through the through hole and is threadedly connected to a fastening nut J3. The fastening nut J3 locks the second fastener J2 and the electrical connector 610.

[0130] The second fastener J2 is generally a bolt, with an external thread at one end of it passing through a through hole. The external thread is threaded to the fastening nut J3. The second fastener J2 is conductive, electrically connecting the electrical connector 610 and the pole 211a. A washer J4 is generally placed between the fastening nut J3 and the electrical connector 610.

[0131] In other embodiments, a threaded hole may be provided on the pole post 211a. The threaded hole on the pole post 211a is a blind hole design. After the screw passes through the through hole, it is threaded to the threaded hole on the pole post 211a to connect the electrical connector 610 and the pole post 211a to conduct electricity.

[0132] At this point, the electrical connector 610 and the terminal 211a are easy to assemble and disassemble, and are also economical.

[0133] Preferably, the through hole is a square hole, which can absorb the installation dimensional tolerances of the second fastener J2 on the core pole 211a in the front, back, left and right directions.

[0134] In some embodiments, refer to Figure 10 The support plate 620 is provided with a vent 621, which is positioned opposite to the explosion-proof valve 211b of the battery cell 211. In practical applications, the explosion-proof valve 211b is located at the top of the battery pack 210, and the support plate 620 is located on one side of the top of the battery pack 210. The same vent 621 can correspond to one or more explosion-proof valves 211b. When a battery cell 211 in the battery pack 210 experiences thermal runaway, the high-temperature fumes released when the explosion-proof valve 211b opens can be discharged into the battery box 100 through the vent 621, preventing the support plate 620 from obstructing the venting of the battery pack 210.

[0135] In some embodiments, refer to Figure 1 and Figure 2 The battery pack 1000 also includes a piping assembly 700, which includes an inlet pipe 701 and an outlet pipe 702. Each liquid cooling plate 220 is independently connected to the inlet pipe 701 and the outlet pipe 702.

[0136] That is, the flow channel portion 221 of each liquid cooling plate 220 is connected in parallel between the liquid inlet pipe 701 and the liquid outlet pipe 702. The liquid inlet pipe 701 is connected to the liquid inlet on the battery box 100 for the heat exchange medium to enter the battery box 100. The liquid outlet pipe 702 is connected to the liquid outlet on the battery box 100 for the heat exchange medium to flow out of the battery box 100.

[0137] At this point, the liquid cooling plates 220 are connected in parallel. If one of the liquid cooling plates 220 deforms and becomes blocked, it will not affect the flow of the heat exchange medium in the other liquid cooling plates 220. Moreover, this parallel connection of the liquid cooling plates 220 helps to ensure the heat exchange effect of the liquid cooling plates 220.

[0138] In the specific embodiments, please refer to... Figure 1 and Figure 2 Both the inlet pipe 701 and the outlet pipe 702 include a telescopic pipe 700b and a connector 700a connected to the liquid cooling pipe. Adjacent connectors 700a are connected via the telescopic pipe 700b.

[0139] Specifically, the inlet pipe 701 and the outlet pipe 702 extend in a long tubular shape along the first direction X. The water nozzles 222b of each liquid cooling plate 220 are connected to the inlet pipe 701 and the outlet pipe 702 via pipe connection connectors 700a. Adjacent connectors 700a, either belonging to the inlet pipe 701 or the outlet pipe 702, are connected by a telescopic tube 700b. In practical applications, the length of the telescopic tube 700b can be adjusted according to the distance between the two connectors 700a to accommodate pipe dimensional tolerances. Furthermore, the water nozzles 222b are detachable from the connectors 700a, making it easy to separate the liquid cooling plate 220 from the inlet pipe 701 and the outlet pipe 702 in the battery liquid cooling unit 200, reducing disassembly difficulty.

[0140] In one specific embodiment of this application, combined with Figure 1 and Figure 2 Understood, the battery pack 1000 includes a battery box 100, a battery liquid cooling unit 200, an end plate 300, a support pad 400, and a buffer component 500. The battery box 100 includes a lower box body 103 and a box cover, the box cover being removably fitted onto the upper end of the lower box body 103. Figure 1 and Figure 2 This is a structural diagram of the battery pack 1000 hidden behind the cover. The assembly process of the battery pack 1000 is roughly as follows:

[0141] First, multiple battery liquid cooling units 200 are obtained by assembling battery cells 211 and liquid cooling plates 220. Then, one end plate 300 is installed at a designated position in the lower housing 103, and the end plate 300 is held in place by a stacking fixture. Then, a buffer 500 is attached to the inner side of the end plate 300. Then, the battery liquid cooling units 200 are stacked sequentially in the lower housing 103 along the first direction X. Then, the buffer 500 is attached to the side of all battery liquid cooling units 200 away from the end plate 300. Then, the other end plate 300 is installed... On the lower housing 103, the end plates 300 on both sides are pressed along the first direction X using a stacking fixture, compressing the buffer 500 until a certain size is reached. Then, the rear-placed end plates 300 are fixed to the lower housing 103. Next, each liquid cooling plate 220 is fixed to the lower housing 103. Then, the signal acquisition assembly 600 is placed on top of the battery pack 210, and the electrical connector 610 is fixed to the terminal post 211a of the battery pack 210, thus installing the signal acquisition assembly 600. Finally, the housing cover is installed on the lower housing 103, completing the assembly of the battery pack 1000. When a battery cell 211 is damaged and needs to be disassembled, the above steps are reversed. After removing the battery liquid cooling unit 200, the damaged battery cell 211 is detached from the liquid cooling plate 220 for disassembly, repair, and replacement.

[0142] In addition, this application also proposes a battery liquid cooling unit 200, including a liquid cooling plate 220, an adhesive part 230 and a battery pack 210. The adhesive part 230 can detachably bond the liquid cooling plate 220 and the battery pack 210. The battery pack 210 includes a plurality of battery cells 211 arranged side by side along the second direction Y. The liquid cooling plate 220 includes a wing plate 221a and a web plate 221b. The web plate 221b is erected on one side of the wing plate 221a along the third direction Z. Each battery cell 211 is supported on the wing plate 221a and is thermally connected to one side of the web plate 221b in the first direction X. The liquid cooling plate 220 has a disassembly and assembly part 222c for detachable installation in the battery box 100. The first direction X, the second direction Y and the third direction Z intersect each other and are not coplanar.

[0143] Furthermore, the battery liquid cooling unit 200 includes all other features and technical effects of the battery liquid cooling unit 200 described above, which will not be repeated here.

[0144] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0145] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack (1000), characterized in that, include: Battery box (100); Multiple battery liquid cooling units (200) are arranged sequentially in the battery box (100) along a first direction (X). Each battery liquid cooling unit (200) includes a liquid cooling plate (220), an adhesive part (230), and a battery pack (210). The adhesive part (230) can detachably bond the liquid cooling plate (220) and the battery pack (210). The battery pack (210) includes multiple battery cells (211) arranged side by side along a second direction (Y). The liquid cooling plate (220) includes a wing plate (221a) and a belly plate (221b). The belly plate (221b) is erected on one side of the wing plate (221a) along a third direction (Z). Each battery cell (211) is supported on the wing plate (221a) and is thermally connected to the belly plate (221b). Each of the battery liquid cooling units (200) is detachably mounted to the battery box (100) via the liquid cooling plate (220), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other and are not coplanar.

2. The battery pack (1000) according to claim 1, characterized in that, The bonding strength of the adhesive portion (230) does not exceed 3 MPa; and / or, Each of the battery packs (210) has a battery cell (211) bonded to the web (221b) via a first adhesive portion (231) and / or bonded to the wing (221a) via a second adhesive portion (232), wherein the first adhesive portion (231) and the second adhesive portion (232) are double-sided adhesive or thermally conductive adhesive; and / or, The battery pack (210) is positioned along the first direction (X) beyond the edge of the wing (221a); ​​and / or, The web plate (221b) is located at the center of the wing plate (221a), and the battery pack (210) is thermally connected to both opposite sides of the web plate (221b); and / or, The included angle α between the wing plate (221a) and the web plate (221b) is 88° to 92°; and / or, The liquid-cooled plate (220) includes a reinforcing plate (223) disposed on the side of the wing plate (221a) opposite to the web plate (221b); and / or, In each of the battery packs (210), an insulating sheet is provided between every two adjacent battery cells (211).

3. The battery pack (1000) according to claim 1, characterized in that, The web (221b) and the wing (221a) constitute the flow channel (221) of the liquid cooling plate (220), and at least one end of the flow channel (221) is open in the second direction (Y); The liquid cooling plate (220) further includes a flow collection part (222), which includes a recessed cavity (222a) recessed along the second direction (Y). The open end of the flow channel part (221) is sealed and inserted into the recessed cavity (222a). A water nozzle (222b) communicating with the flow channel part (221) is provided on the flow collection part (222). The current collector (222) is provided with a disassembly part (222c) that is detachably connected to the battery box (100).

4. The battery pack (1000) according to claim 3, characterized in that, The disassembly / assembly part (222c) includes a disassembly / assembly hole (c1) provided in the current collection part (222), the disassembly / assembly hole (c1) being isolated from the cavity (222a), and the disassembly / assembly hole (c1) being provided through the third direction (Z); along the third direction (Z), the projection of the disassembly / assembly hole (c1) falls within the projection range of the cavity (222a); the disassembly / assembly hole (c1) is provided in a strip shape along the first direction (X); and / or, The liquid cooling plate (220) also includes a buffer pad (224), which is disposed on the side of the current collector (222) away from the battery pack (210) along a third direction (Z).

5. The battery pack (1000) according to claim 1, characterized in that, The battery pack (1000) further includes an end plate (300) that clamps along the first direction (X) on opposite sides of all the battery liquid cooling units (200), and the end plate (300) is detachably connected to the battery box (100); and / or, The battery pack (1000) also includes a support pad (400) disposed between the wing plate (221a) of all the battery liquid cooling units (200) and the battery box (100).

6. The battery pack (1000) according to claim 5, characterized in that, The battery pack (1000) includes the end plate (300); Each of the end plates (300) includes a first plate portion (310) and a second plate portion (320) arranged intersectingly. The first plate portion (310) is arranged along the first direction (X) between the second plate portion (320) and the battery liquid cooling unit (200). At least one of the first plate portion (310) and the second plate portion (320) is detachably connected to the battery box (100); and / or, The battery pack (1000) further includes a buffer (500) disposed between the end plate (300) and the battery liquid cooling unit (200). The buffer (500) includes an insulating layer (501) and a buffer layer (502) connected to each other. The insulating layer (501) is bonded to the battery liquid cooling unit (200), and the buffer layer (502) is bonded to the end plate (300).

7. The battery pack (1000) according to claim 6, characterized in that, The end plate (300) includes a first plate portion (310) and a second plate portion (320). Both the first plate portion (310) and the second plate portion (320) are provided with mounting holes (300c). A first fastener (J1) passes through each of the mounting holes (300c) and is detachably connected to the battery box (100) to fix the first plate portion (310) and the second plate portion (320) to the battery box (100).

8. The battery pack (1000) according to claim 1, characterized in that, The battery pack (1000) also includes a signal acquisition assembly (600), which includes a tray (620) and an electrical connector (610). The tray (620) is located on the side of all the battery liquid cooling units (200) away from the wing plate (221a). The electrical connector (610) is located on the side of the tray (620) away from the battery liquid cooling units (200) and is detachably connected to the terminal post (211a) of the battery cell (211).

9. The battery pack (1000) according to claim 8, characterized in that, The electrical connector (610) is provided with a through hole, and the pole (211a) is provided with a second fastener (J2). The second fastener (J2) passes through the through hole and is threadedly connected to a fastening nut (J3). The fastening nut (J3) locks the second fastener (J2) and the electrical connector (610). The tray (620) is provided with an exhaust hole (621), which is disposed opposite to the explosion-proof valve (211b) of the battery cell (211).

10. The battery pack (1000) according to claim 1, characterized in that, The battery pack (1000) also includes a piping assembly (700), which includes an inlet pipe (701) and an outlet pipe (702). Each of the liquid cooling plates (220) is independently connected to the inlet pipe (701) and the outlet pipe (702). Both the inlet pipe (701) and the outlet pipe (702) include a telescopic pipe (700b) and a connector (700a) connected to the liquid cooling plate (220), with adjacent connectors (700a) connected via the telescopic pipe (700b).

11. A battery liquid cooling unit (200), characterized in that, The device includes a liquid cooling plate (220), an adhesive part (230), and a battery pack (210). The adhesive part (230) is detachably bonded to the liquid cooling plate (220) and the battery pack (210). The battery pack (210) includes a plurality of battery cells (211) arranged side by side along a second direction (Y). The liquid cooling plate (220) includes a wing plate (221a) and a belly plate (221b). The belly plate (221b) is erected on one side of the wing plate (221a) along a third direction (Z). Each battery cell (211) is supported on the wing plate (221a) and is thermally connected to one side of the belly plate (221b) in the first direction (X). The liquid cooling plate (220) has a disassembly and assembly part (222c) for detachable installation in the battery box (100), wherein the first direction (X), the second direction (Y) and the third direction (Z) intersect each other and are not coplanar.

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