A battery pack

Abstract

The embodiment of the application provides a battery pack, the battery pack comprises: a single battery; the single battery comprises a shell and a pole core; the pole core comprises a top surface, a bottom surface, a first side surface and a second side surface, the area of the second side surface is greater than the area of the first side surface; the shell comprises a body part and a heat exchange part, the body part has a containing cavity, the pole core is arranged in the containing cavity, the heat exchange part is connected to one side of the body part away from the pole core and forms a heat exchange cavity together with the body part, and the heat exchange cavity is arranged opposite to the bottom surface, the first side surface and part of the top surface of the pole core. The embodiment of the application improves the heat exchange efficiency, avoids the problem that the heat exchange medium is blocked due to the fact that the space of the heat exchange cavity is pressed because the first side surface of the pole core expands, and guarantees the heat dissipation efficiency and the charging and discharging performance of the battery pack.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack. Background Technology

[0002] As users demand longer battery life from their devices, the energy density of battery packs is constantly increasing. This causes battery packs to generate a lot of heat during use. When the battery pack temperature is too high, it will affect its charging and discharging performance and lifespan. Therefore, battery packs are usually equipped with liquid cooling structures to reduce temperature.

[0003] In related technologies, there are various forms of liquid cooling structures in battery packs, which achieve different cooling efficiencies by cooling different parts of individual cells. However, the cooling efficiency of individual cells in current liquid cooling structures still needs to be further improved. Utility Model Content

[0004] This application aims to provide a battery pack to solve the problem of low cooling efficiency in liquid-cooled structures in related technologies.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application discloses a battery pack having a first direction, a second direction, and a third direction that are perpendicular to each other, and the battery pack includes: a single cell;

[0007] The single battery cell includes a casing and an electrode core;

[0008] The electrode core includes a top surface, a bottom surface, two first side surfaces, and two second side surfaces. The top surface and the bottom surface are arranged opposite each other along the third direction. The two first side surfaces are arranged opposite each other along the first direction. The two second side surfaces are arranged opposite each other along the second direction. The area of ​​the second side surface is larger than the area of ​​the first side surface.

[0009] The housing includes a body and a heat exchange section. The body has a receiving cavity, and the electrode core is disposed in the receiving cavity. The heat exchange section is connected to the side of the body away from the electrode core and surrounds the body to form a heat exchange cavity. The heat exchange cavity is disposed opposite to the bottom surface, the first side surface and part of the top surface of the electrode core.

[0010] Optionally, the body portion includes a top plate, a bottom plate, a first side plate, and a second side plate for enclosing and forming the receiving cavity, wherein the top plate, the bottom plate, the first side plate, and the second side plate are respectively disposed opposite to the top surface, the bottom surface, the first side surface, and the second side surface of the pole core;

[0011] The heat exchange section is connected to the bottom plate, the first side plate, and part of the top plate.

[0012] Optionally, the electrode core includes a first electrode post and a second electrode post, the first electrode post and the second electrode post being spaced apart on the top surface along the first direction and exposed on the top plate;

[0013] The heat exchange section includes a main body and two bends connected to each other, with the two bends respectively connected to both ends of the main body;

[0014] The main body is connected to the base plate and the first side plate, one of the bent portions is connected to the side of the first pole away from the second pole, and the other bent portion is connected to the side of the second pole away from the first pole.

[0015] Optionally, the heat exchange section is provided with a medium inlet and a medium outlet, the medium inlet being located in one of the two bends and the medium outlet being located in the other of the two bends;

[0016] The medium inlet is used to introduce the heat exchange medium into the heat exchange cavity, and the medium outlet is used to export the heat exchange medium out of the heat exchange cavity.

[0017] Optionally, the dimension of the heat exchange section along the second direction is W1, and the dimension of the body section along the second direction is W2, satisfying: W1≤W2.

[0018] Optionally, the battery pack further includes a flow channel plate assembly, the flow channel plate assembly including a flow channel plate, the flow channel plate being provided with a first medium flow channel, the individual battery further includes a first fastener, the first fastener being provided with a second medium flow channel, the first fastener being connected to the flow channel plate and the heat exchange part, and communicating the first medium flow channel and the heat exchange cavity through the second medium flow channel.

[0019] Optionally, the first fastener has a first opening and a second opening, the second medium flow channel communicates with the first medium flow channel through the first opening and with the heat exchange cavity through the second opening;

[0020] The first fastener includes a first end and a second end disposed opposite to each other along the third direction, the first end being close to the heat exchange part, the first opening being disposed between the first end and the second end, and the second opening being disposed at the first end.

[0021] Optionally, the heat exchange section is provided with a medium inlet and a medium outlet, the single cell includes two first fasteners, the flow channel plate includes a liquid inlet plate and a liquid outlet plate, the liquid inlet plate has a liquid inlet cavity, the liquid outlet plate has a liquid outlet cavity, the second medium flow channel of one first fastener is connected to the medium inlet and the liquid inlet cavity, and the second medium flow channel of the other first fastener is connected to the medium outlet and the liquid outlet cavity.

[0022] Optionally, there are multiple individual cells, which are spaced apart along the first direction and the second direction; wherein, the medium inlet or medium outlet of two adjacent individual cells along the first direction are arranged close to each other, and adjacent individual cells along the first direction share a liquid inlet plate, and / or, adjacent individual cells along the first direction share a liquid outlet plate.

[0023] Optionally, the single cell further includes a second fastener, the second end of which passes through the flow channel plate and is locked by the second fastener.

[0024] Optionally, the single cell further includes a first sealing ring and a second sealing ring, wherein the first sealing ring is connected between the flow channel plate and the heat exchange section, and the second sealing ring is connected between the flow channel plate and the second fastener.

[0025] In this embodiment, the single battery cell includes a casing and an electrode core. The electrode core includes a top surface, a bottom surface, a first side surface, and a second side surface. The area of ​​the second side surface is larger than that of the first side surface, so the second side surface is more likely to expand during the operation of the single battery cell. The casing is connected to the heat exchange section through the main body to form a heat exchange cavity for the flow of heat exchange medium. Since the heat exchange cavity is opposite to the bottom surface, the first side surface, and part of the top surface of the electrode core, the heat exchange efficiency is improved. At the same time, the heat exchange cavity is not opposite to the second side surface. Under this structure, the heat exchange cavity space can be avoided due to the expansion of the second side surface of the electrode core, which reduces the risk of the heat exchange medium being blocked and affecting the flow efficiency of the heat exchange medium in the heat exchange cavity, thus ensuring the heat dissipation efficiency and charge-discharge performance of the battery pack.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of the structure of a single battery cell in an embodiment of this application;

[0029] Figure 2 This is a cross-sectional schematic diagram of a single cell in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the battery pack structure in an embodiment of this application;

[0031] Figure 4 This is a cross-sectional schematic diagram of the battery pack in an embodiment of this application;

[0032] Figure 5 yes Figure 4 Enlarged structural diagram of section A in the middle;

[0033] Figure 6 This is an exploded view of the battery pack in an embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the heat exchange medium flow in an embodiment of this application.

[0035] Reference numerals: 100 - Single cell, 10 - Casing, 11 - Main body, 111 - Top plate, 112 - Bottom plate, 113 - First side plate, 114 - Second side plate, 12 - Heat exchange section, 121 - Main body, 122 - Bending section, 123 - Medium inlet, 124 - Medium outlet, 13 - Heat exchange chamber, 20 - Electrode core, 21 - Top surface, 22 - Bottom surface, 23 - First side surface, 24 - Second side surface, 25 - First electrode post 26 - Second pole post, 30 - First fastener, 31 - Second medium flow channel, 32 - First opening, 33 - Second opening, 40 - Second fastener, 50 - First sealing ring, 60 - Second sealing ring, 200 - Flow channel plate assembly, 201 - Flow channel plate, 201a - Inlet plate, 201b - Outlet plate, 202 - First medium flow channel, 203 - Third opening, X - First direction, Y - Second direction, Z - Third direction. Detailed Implementation

[0036] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are 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, and therefore should not be construed as a limitation of this application.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] As users demand longer battery life from their devices, the energy density of batteries continues to increase. This causes batteries to generate a lot of heat during use. When the battery temperature is too high, it will affect its charging and discharging performance and lifespan. Therefore, batteries are usually equipped with liquid cooling structures to cool them down.

[0041] In related technologies, various forms of liquid cooling structures exist in battery packs, achieving different cooling efficiencies by cooling different parts of individual cells. However, the cooling efficiency of current liquid cooling structures for individual cells still needs further improvement. For example, a bottom-cooling structure for the cell is connected to the bottom of the cell and cools the bottom. This type of liquid cooling structure has low cooling efficiency and is suitable for cells with low energy density and low fast charging rates. A bottom and side-cooling structure for the cell can cool both the bottom and sides of the cell simultaneously, with better cooling efficiency than bottom cooling. However, this type of cooling structure usually has a complex piping design, making it difficult to manufacture. A large-area liquid cooling structure for the cell greatly improves cooling efficiency by setting liquid cooling plates of different thicknesses on the large surface of the cell. However, as the cell expands, the cooling efficiency will be greatly reduced. A top and bottom liquid cooling structure for the cell has poor cooling effect on the middle part of the cell.

[0042] To address the aforementioned problems, this application provides a battery pack to solve the issue of low cooling efficiency in liquid-cooled structures in related technologies. For example... Figure 1 As shown, the battery pack provided in this application embodiment has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other. The first direction X is the length direction of the single cell 100, the second direction Y is the width direction of the single cell 100, and the third direction Z is the height direction of the single cell 100.

[0043] The battery pack in this embodiment may include: a single cell 100; the single cell 100 includes a housing 10 and an electrode core 20; the electrode core 20 includes a top surface 21, a bottom surface 22, a first side surface 23 and a second side surface 24, the area of ​​the second side surface 24 being larger than the area of ​​the first side surface 23; the housing 10 includes a body portion 11 and a heat exchange portion 12, the body portion 11 having a receiving cavity, the electrode core 20 being disposed in the receiving cavity, the heat exchange portion 12 being connected to the side of the body portion 11 away from the electrode core 20, and enclosing the body portion 11 to form a heat exchange cavity 13, the heat exchange cavity 13 being opposite to the bottom surface 22, the first side surface 23 and part of the top surface 21 of the electrode core 20, and the heat exchange cavity 13 being used for the flow of heat exchange medium.

[0044] In this embodiment, the single battery 100 includes a housing 10 and an electrode core 20. The electrode core 20 includes a top surface 21, a bottom surface 22, a first side surface 23, and a second side surface 24. The area of ​​the second side surface 24 is larger than that of the first side surface 23. Therefore, the second side surface 24 is more likely to expand during the operation of the single battery 100. The housing 10 is connected to the heat exchange section 12 through the body section 11 to form a heat exchange cavity 13 for the flow of heat exchange medium. Since the heat exchange cavity 13 is opposite to the bottom surface 22, the first side surface 23, and part of the top surface 21 of the electrode core 20, the heat exchange efficiency is improved. At the same time, the heat exchange cavity 13 is not opposite to the second side surface 24. Under this structure, the space of the heat exchange cavity 13 can be squeezed due to the expansion of the second side surface 24 of the electrode core 20, reducing the risk of the heat exchange medium being blocked and affecting the flow efficiency of the heat exchange medium in the heat exchange cavity 13, and ensuring the heat dissipation efficiency and charge and discharge performance of the battery pack.

[0045] Specifically, in this embodiment, the single battery 100 is a square battery. Among the multiple faces of the electrode core 20, there are two first side faces 23 and two second side faces 24. The two first side faces 23 are arranged opposite each other along a first direction X, and the two second side faces 24 are arranged opposite each other along a second direction Y. The top surface 21 and the bottom surface 22 are arranged opposite each other along a third direction Z. The top surface 21 of the single battery 100 typically has a terminal post, and the bottom surface 22 is a plane. Generally, a single battery 100 in an upright position means the terminal post faces upwards, and an inverted single battery 100 means the terminal post faces downwards. The area of ​​the second side face 24 is larger than the area of ​​the first side face 23; that is, the second side face 24 is the larger face of the electrode core 20. It should be noted that a battery pack typically includes multiple single batteries 100, which are usually arranged in an array along one or more directions. To optimize the space utilization of the battery pack, when multiple single batteries 100 are arranged in an array, the larger faces of adjacent single batteries 100 are usually spaced apart. Because the larger surface area contains more electrode material, the reaction of the electrode material in the larger surface area is more intense when the electrode core 20 undergoes a chemical reaction, resulting in more gas being generated. This makes the larger surface area more prone to expansion. In this embodiment, the second side surface 24 is more prone to expansion.

[0046] The housing 10 includes a body portion 11 and a heat exchange portion 12. The body portion 11 has a receiving cavity, and the electrode core 20 is disposed within the receiving cavity. The heat exchange portion 12 is connected to the side of the body portion 11 opposite to the electrode core 20, meaning the heat exchange portion 12 is located outside the receiving cavity and connected to the body portion 11. Specifically, the body portion 11 has a square structure and is hollow inside to form a receiving cavity for placing the electrode core 20. The heat exchange portion 12 has a flow channel groove, and the heat exchange portion 12 is fastened to the body portion 11. The body portion 11 blocks the opening of the flow channel groove, forming a heat exchange cavity 13 for the flow of heat exchange medium. Furthermore, the heat exchange portion 12 is designed such that after the heat exchange portion 12 is connected to the body portion 11, the heat exchange cavity 13 is opposite to the bottom surface 22, the first side surface 23, and part of the top surface 21 of the electrode core 20. In this embodiment, a heat exchange medium flows through the heat exchange cavity 13. Since the heat exchange cavity 13 is designed to be positioned opposite only to the bottom surface 22, the first side surface 23, and part of the top surface 21 of the pole core 20, the heat exchange cavity 13 avoids being opposite to the second side surface 24. This avoids the problem of the flow of the heat exchange medium in the heat exchange cavity 13 being obstructed due to the expansion of the second side surface 24. The flow of the heat exchange medium in the heat exchange cavity 13 is smoother, thereby ensuring the cooling efficiency.

[0047] In specific applications, the body 11 and the heat exchange part 12 are made of metal, such as aluminum, aluminum alloy, or stainless steel. During processing, the body 11 and the heat exchange part 12 can be machined separately, and then the heat exchange part 12 can be welded to the body 11. This application does not impose specific limitations on the forming process of the housing 10. It is understood that by directly connecting the heat exchange part 12 to the body 11 to form the heat exchange cavity 13, the structural adhesive between the cold plate and the housing 10 of the single battery cell 100 in related technologies is eliminated, avoiding connection failure due to adhesive aging, resulting in more stable and reliable cooling performance of the battery pack.

[0048] The thickness of the main body 11 and the heat exchange part 12 is greater than 0.5 mm to ensure structural strength. The size of the heat exchange cavity 13 in the direction perpendicular to each surface of the pole core 20 is between 1.5 and 6 mm. This avoids the situation where the heat exchange cavity 13 is too thin, which would cause the heat exchange medium to be obstructed due to the expansion and compression of the heat exchange cavity 13 by the pole core 20. At the same time, it avoids the problem that the heat exchange medium flow rate is too fast due to the excessive size of the heat exchange cavity 13, which would weaken the heat exchange effect. The cross-section of the heat exchange cavity 13 can be square, parallelogram, trapezoid, etc., and this application embodiment does not make specific limitations on this.

[0049] Optionally, the body portion 11 includes a top plate 111, a bottom plate 112, a first side plate 113, and a second side plate 114 for enclosing and forming a receiving cavity. The top plate 111, bottom plate 112, first side plate 113, and second side plate 114 are respectively opposite to the top surface 21, bottom surface 22, first side surface 23, and second side surface 24 of the pole core 20. The heat exchange portion 12 is connected to the bottom plate 112, the first side plate 113, and part of the top plate 111. In this way, the structure of the body portion 11 of the housing 10 is more compatible with the structure of the pole core 20. Since the body portion 11 is part of forming the heat exchange cavity 13, by setting the structure of the body portion 11 of the housing 10 to be more compatible with the structure of the pole core 20, the fitting gap between the body portion 11 and the pole core 20 is smaller, so that the heat exchange medium in the heat exchange cavity 13 can more directly exchange heat with key heat-generating areas such as the bottom surface 22 and the first side surface 23 of the pole core 20, thereby improving the heat exchange efficiency.

[0050] Specifically, the body 11 includes two first side plates 113 and two second side plates 114. The two first side plates 113 are arranged opposite each other along a first direction X, and the two second side plates 114 are arranged opposite each other along a second direction Y. The top plate 111 and the bottom plate 112 are arranged opposite each other along a third direction Z. The second side plate 24 is enclosed inside the housing 10. More specifically, as shown in the figure... Figure 1 As shown, the second side plate 114 of the housing 10 is a visible structure, while the second side 24 is disposed inside the housing 10 and opposite to the second side plate 114 of the housing 10. The illustration of the second side 24 here only shows the positional relationship of the other second side plates 114. In fact, the second side 24 is not visible. The relative relationship between the other sides of the single cell 100 and the housing 10 is also as described above.

[0051] Optionally, the electrode core 20 includes a first electrode post 25 and a second electrode post 26, which are spaced apart along a first direction X on the top surface 21 and exposed on the top plate 111. The heat exchange section 12 includes a main body section 121 and two bent sections 122 connected to each other, with the two bent sections 122 respectively connected to both ends of the main body section 121. The main body section 121 is connected to the bottom plate 112 and the first side plate 113. One bent section 122 is connected to the side of the first electrode post 25 away from the second electrode post 26, and the other bent section 122 is connected to the side of the second electrode post 26 away from the first electrode post 25. The first electrode post 25 and the second electrode post 26 can be the positive electrode post and the negative electrode post of the electrode core 20, respectively. During discharge, the first electrode post 25 and the second electrode post 26 are used for output and input current, respectively; during charging, the first electrode post 25 and the second electrode post 26 are used for input and output current, respectively.

[0052] In this embodiment, the heat exchange medium in the main body 121 can be used to exchange heat between the bottom surface 22 and the first side surface 23 of the electrode core 20. With this design, the main body 121 can be regarded as extending from the base plate 112 to both sides and surrounding the bottom surface 22 and the first side surface 23 of the electrode core 20. Two bends 122 are connected to the two ends of the main body 121. Among the two bends 122, one bend 122 is connected to the side of the first electrode post 25 away from the second electrode post 26, and the other bend 122 is connected to the side of the second electrode post 26 away from the first electrode post 25. In this way, the heat exchange part 12 avoids the first electrode post 25 and the second electrode post 26, and avoids interference between the first electrode post 25 and the second electrode post 26 on the flow of the heat exchange medium.

[0053] Specifically, the main body 121 has a U-shaped structure, comprising three interconnected parts. These three parts are connected to the bottom plate 112 and two first side plates 113 of the main body 11, respectively. The heat exchange cavity 13 corresponding to the main body 121 has a large volume and can serve as the primary heat exchange site, exchanging heat with the bottom surface 22 and two first side surfaces 23 of the pole core 20. The two bent portions 122 bend inward from the ends of the main body 121 and connect to the top plate 111 of the main body 11. The portion of the heat exchange cavity 13 corresponding to the bent portions 122 has a smaller volume and can serve as an auxiliary heat exchange site, exchanging heat with the top surface 21 of the pole core 20. This structure forms a multi-layered heat exchange structure of "bottom surface 22 + two first side surfaces 23 + top surface 21," allowing heat exchange from multiple heating surfaces of the pole core 20 and ensuring efficient heat dissipation for the pole core 20.

[0054] like Figure 2 As shown, the heat exchange section 12 is provided with a medium inlet 123 and a medium outlet 124. The medium inlet 123 is located in one of the two bends 122, and the medium outlet 124 is located in the other of the two bends 122. The medium inlet 123 is used to introduce the heat exchange medium into the heat exchange cavity 13, and the medium outlet 124 is used to discharge the heat exchange medium out of the heat exchange cavity 13. In this structure, the heat exchange medium can enter the heat exchange cavity 13 from one bend 122, then pass along the length direction of the main body 121, and then flow out from the other bend 122. The flow path passes sequentially through one side top surface 21, one first side surface 23, the bottom surface 22, another first side surface 23, and the other side top surface 21 of the pole core 20, covering multiple heat-generating parts of the pole core 20, improving the targeting and uniformity of heat exchange. In addition, since the first pole post 25 and the second pole post 26 of the pole core 20 serve as the input / output terminals of the current, the heat generation is significantly higher than that of other parts of the pole core 20. By placing the medium inlet 123 and the medium outlet 124 on the bend 122 near the first pole post 25 and the second pole post 26, the heat exchange efficiency of the top surface 21 of the pole core 20 is ensured.

[0055] In practical applications, the medium inlet 123 can be used to connect the flow channel plate 201, which is used to store the heat exchange medium. The heat exchange medium enters the heat exchange cavity 13 through the medium inlet 123, and the heat exchange medium in the heat exchange cavity 13 flows out of the heat exchange cavity 13 through the medium outlet 124, so as to realize the renewal of the heat exchange medium in the heat exchange cavity 13, thereby ensuring that the temperature of the heat exchange medium in the heat exchange cavity 13 is kept at a low level, and ensuring the heat exchange effect between the heat exchange medium and the electrode core 20.

[0056] like Figure 1 As shown, the heat exchange section 12 has a dimension of W1 along the second direction Y, and the main body 11 has a dimension of W2 along the second direction Y, satisfying: W1 ≤ W2. Figure 4 As shown, the battery pack contains multiple individual cells 100, which are arranged in an array along the first direction X and the second direction Y. In this embodiment, by controlling the size W1 of the heat exchange section 12 to be no larger than the size W2 of the main body section 11, interference between the heat exchange section 12 and the stacking of adjacent individual cells 100 can be avoided when the multiple individual cells 100 are arranged along the second direction Y. This ensures close contact between adjacent individual cells 100, improves the utilization rate of the internal space of the battery pack, and can also effectively prevent vibration between individual cells 100 when the battery pack is subjected to external forces.

[0057] like Figure 3 , Figure 4 As shown, the battery pack also includes a flow channel plate assembly 200, which includes a flow channel plate 201. The flow channel plate 201 is provided with a first dielectric flow channel 202. The individual battery cell 100 also includes a first fastener 30, such as... Figure 5 As shown, a second medium flow channel 31 is provided inside the first fastener 30. The first fastener 30 is connected to the flow channel plate 201 and the heat exchange part 12, and is connected to the first medium flow channel 202 and the heat exchange chamber 13 through the second medium flow channel 31.

[0058] Specifically, the flow channel plate 201 is provided with a third opening 203. One end of the first fastener 30 is connected to the heat exchange part 12, and the other end passes through the third opening 203 and extends at least partially into the first medium flow channel 202, so that the second medium flow of the first fastener 30 connects the first medium flow channel 202 of the flow channel plate 201 and the heat exchange chamber 13 of the shell 10.

[0059] In this embodiment, the first fastener 30 connects the flow channel plate 201 and the housing 10, thereby enabling the connection and fixation between the individual battery cell 100 and the flow channel plate assembly 200. It should be noted that in conventional battery packs, a flow channel plate 201 is provided to introduce the heat exchange medium into the heat exchange cavity 13. The flow channel plate 201 and the individual battery cell 100 need to be fixed with fasteners to ensure reliable interconnection. Furthermore, a separate connecting component is required to connect the first medium flow channel 202 and the heat exchange cavity 13, allowing the heat exchange medium in the first medium flow channel 202 to be introduced into the heat exchange cavity 13. However, in this embodiment, a second medium flow channel 31 is directly provided inside the first fastener 30, and the first medium flow channel 202 and the heat exchange cavity 13 are directly connected through the second medium flow channel 31 of the first fastener 30. This eliminates the need for a connecting component, simplifies the battery pack structure, saves internal space, and makes it possible to increase the energy density of the battery pack. In specific applications, the heat exchanger 12 can be made of metal, and the first fastener 30 can also be made of metal. The first fastener 30 can be connected to the heat exchanger 12 by welding. In practical applications, the flow channel plate 201 can be connected to an external heat exchange medium source, such as coolant, to achieve the renewal of the heat exchange medium in the first medium flow channel 202.

[0060] In specific applications, the flow channel plate 201 can be made of plastic or extruded metal. The wall thickness of the flow channel plate 201 is set to be greater than 1 mm to ensure its structural strength.

[0061] like Figure 5 As shown, the first fastener 30 is a cylindrical structure with an outer diameter of D1, and the second medium flow channel 31 is a cylindrical flow channel with a diameter of D2, satisfying: D2≤0.8D1. It should be noted that the second medium flow channel 31 is formed by opening a hole in the fastener of the cylindrical structure. The outer diameter D1 of the first fastener 30 and the diameter D2 of the second medium flow channel 31 are related to the wall thickness of the side wall of the first fastener 30. Specifically, when the outer diameter D1 of the first fastener 30 is determined, the larger the diameter D2 of the second medium flow channel 31 inside it is, the smaller the wall thickness of the side wall of the first fastener 30 will be. Therefore, by controlling the relationship between the diameter D2 of the second medium flow channel 31 and the outer diameter D1 of the first fastener 30, this application ensures the wall thickness of the side wall of the first fastener 30, ensures the structural strength of the first fastener 30, improves the vibration and impact resistance, and improves the reliability of the heat exchange medium flow, thereby ensuring the normal heat exchange performance of the battery pack.

[0062] like Figure 5 As shown, the first fastener 30 has a cylindrical structure, and the outer diameter of the first fastener 30 is D1, as... Figure 1As shown, the dimension of the heat exchange section 12 along the second direction Y is W1, which satisfies: D1≤0.7W1.

[0063] Since the first fastener 30 is connected to the heat exchange part 12, when the first fastener 30 is connected to the heat exchange part 12, the outer wall surface of the first fastener 30 is located between the two edges of the heat exchange part 12 along the second direction Y. In this embodiment, by controlling the relationship between the outer diameter of the heat exchange part 12 and the outer diameter of the first fastener 30, the distance between the outer wall surface of the first fastener 30 and the edge of the heat exchange part 12 when the first fastener 30 is connected to the heat exchange part 12 can be guaranteed, thus ensuring the structural strength of the heat exchange part 12 around the first fastener 30 and ensuring the reliability of the connection between the first fastener 30 and the heat exchange part 12. This allows the first fastener 30 to reliably pass the heat exchange medium in the first medium flow channel 202 into the heat exchange cavity 13 through the second medium flow channel 31, or to export the heat exchange medium in the heat exchange cavity 13 to the first medium flow channel 202 through the second medium flow channel 31.

[0064] Optionally, the first fastener 30 is provided with a first opening 32 and a second opening 33. The second medium flow channel 31 is connected to the first medium flow channel 202 through the first opening 32 and to the heat exchange chamber 13 through the second opening 33. The first fastener 30 includes a first end and a second end disposed opposite to each other in a third direction Z. The first end is close to the heat exchange part 12. The first opening 32 is disposed between the first end and the second end, and the second opening 33 is disposed at the first end.

[0065] In this embodiment, since the second opening 33 is located at the first end, the first fastener 30 can directly connect the first end to the heat exchange section 12, thereby achieving communication between the second medium flow channel 31 and the heat exchange cavity 13. The thickness of the heat exchange cavity 13 can be designed to be smaller, thereby reducing the space occupied by the heat exchange cavity 13 inside the battery pack. In addition, since the first opening 32 is located between the first end and the second end, the first fastener 30 can completely pass through the flow channel plate 201. Thus, the connection position between the first fastener 30 and the flow channel plate 201 can be set on both sides of the flow channel plate 201 along the third direction Z, and the connection between the first fastener 30 and the flow channel plate 201 can be more stable and reliable.

[0066] Optionally, there are two first openings 32, which are symmetrically arranged on the side wall of the first fastener 30 along the first direction X. In this way, the design of two first openings 32 improves the heat exchange efficiency between the flow channel plate 201 and the heat exchange medium in the second medium flow channel 31, which helps to improve the heat exchange efficiency between the second medium flow channel 31 and the heat exchange cavity 13, so as to accelerate the cooling speed of the pole core 20.

[0067] Optionally, the single cell 100 also includes a second fastener 40, the second end of the first fastener 30 passing through the flow channel plate 201 and locked by the second fastener 40. The second fastener 40 strengthens the connection between the first fastener 30 and the flow channel plate 201, effectively avoiding the risk of the first fastener 30 becoming loose due to vibration or fretting wear, which could lead to leakage of the heat exchange medium.

[0068] In specific applications, the first fastener 30 can be a hollow bolt with threads on the outer surface of its second end, and the second fastener 40 is a nut. After the second end of the first fastener 30 passes through the flow channel plate 201, the nut can lock the first fastener 30 and the flow channel plate 201 by engaging with the threads on the outer surface of the first fastener 30.

[0069] Furthermore, the single cell 100 also includes a first sealing ring 50 and a second sealing ring 60, both of which are fitted onto the first fastener 30. The first sealing ring 50 is connected between the flow channel plate 201 and the heat exchange part 12, and the second sealing ring 60 is connected between the flow channel plate 201 and the second fastener 40.

[0070] In this embodiment, the first sealing ring 50 and the second sealing ring 60 provide a double seal for the connection between the first fastener 30 and the flow channel plate 201, thereby avoiding the risk of leakage of the heat exchange medium in the second medium flow channel 31. In specific applications, the first sealing ring 50 and the second sealing ring 60 can be made of aging-resistant silicone rubber. The first sealing ring 50 and the second sealing ring 60 are assembled onto the first fastener 30 by an interference fit. The bolt locking force compresses the first sealing ring 50 and the second sealing ring 60 to achieve a sealing and leak-proof function, while ensuring that the rubber compression rate does not exceed 20%, avoiding the problem of decreased reliability of the first sealing ring 50 and the second sealing ring 60 due to excessive compression rate during long-term use.

[0071] like Figure 5 As shown, the first fastener 30 is a cylindrical structure with an outer diameter of D1, and the first opening 32 is a circular opening with a diameter of D3, satisfying: D3≤0.8D1.

[0072] It is understandable that since the first opening 32 is formed by opening a hole in the side wall of the first fastener 30, if the diameter of the first opening 32 is designed to be too large, that is, the hole diameter opened in the side wall of the first fastener 30 is large, this will affect the structural strength of the first fastener 30. Therefore, the embodiments of this application control the diameter of the first opening 32 to avoid opening an excessively large hole in the side wall of the first fastener 30, thereby ensuring the strength of the main structure of the first fastener 30 and ensuring the reliability of the first fastener 30.

[0073] Optionally, the heat exchange section 12 is provided with a medium inlet 123 and a medium outlet 124. The single cell 100 includes two first fasteners 30. The flow channel plate 201 includes a liquid inlet plate 201a and a liquid outlet plate 201b. The liquid inlet plate 201a has a liquid inlet cavity, and the liquid outlet plate 201b has a liquid outlet cavity. The second medium flow channel 31 of one of the first fasteners 30 is connected to the medium inlet 123 and the liquid inlet cavity, and the second medium flow channel 31 of the other first fastener 30 is connected to the medium outlet 124 and the liquid outlet cavity.

[0074] In this embodiment, the design of two first fasteners 30, an inlet plate 201a, and an outlet plate achieves independent inlet and outlet paths, avoiding intersections and ensuring efficient inlet and outlet processes. This allows for rapid replacement of the heat exchange medium within the heat exchange chamber 13, thereby improving the heat exchange efficiency between the heat exchange medium and the electrode core 20. In practical applications, the two first fasteners 30 are spaced apart along the first direction X. Correspondingly, the inlet plate 201a and the outlet plate 201b are also spaced apart along the first direction X. This structure is also suitable for situations where multiple individual cells 100 are arranged along the second direction Y, allowing multiple individual cells 100 along the second direction Y to share a single inlet plate 201a and outlet plate 201b. Both the inlet plate 201a and the outlet plate 201b are hollow structures, each containing a cavity for the flow of the heat exchange medium.

[0075] like Figure 4 , Figure 6 As shown, there are multiple individual cells 100, which are spaced apart along the first direction X and the second direction Y. The medium inlet 123 or medium outlet 124 of two adjacent individual cells 100 along the first direction X are arranged close to each other, and adjacent individual cells 100 along the first direction X share a liquid inlet plate 201a, and / or adjacent individual cells 100 along the first direction X share a liquid outlet plate 201b.

[0076] It is understandable that the medium inlet 123 or medium outlet 124 of two adjacent single cells 100 along the first direction X are arranged close to each other, so that the adjacent single cells 100 along the first direction X can share a liquid inlet plate 201a or liquid outlet plate 201b. In this case, the number of flow channel plates 201 in the flow channel plate assembly 200 is reduced, the complexity of the internal structure of the battery pack is simplified, and the internal space of the battery pack is saved, so that the internal structure of the battery pack can be designed to be more compact.

[0077] Reference Figure 7The figure shows two individual cells 100 arranged at intervals along the first direction X in an embodiment of this application. As shown, the medium outlets 124 of the two individual cells 100 are arranged close to each other, while the medium inlets 123 of the two individual cells 100 are far apart. In this arrangement, the two individual cells 100 share a liquid outlet plate 201b and are respectively introduced into the heat exchange chamber 13 through a liquid inlet plate 201a. The heat exchange medium in the first medium flow channel 202 in the liquid inlet plate 201a enters the second medium flow channel 31 of the first fastener 30 through the first opening 32, and then enters the heat exchange chamber 13 through the second opening 33 of the first fastener 30. It continues to flow in the heat exchange chamber 13 and passes sequentially through one side top surface 21, one first side surface 23, the bottom surface 22, another first side surface 23, and another side top surface 21 of the electrode core 20. Finally, it flows through another first fastener 30 to the liquid outlet plate 201b, thereby realizing the renewal of the heat exchange medium in the heat exchange chamber 13.

[0078] Furthermore, such as Figure 4 , Figure 6 As shown, adjacent individual cells 100 along the second direction Y also share a liquid inlet plate 201a or a liquid outlet plate 201b. The liquid inlet plate 201a is used to introduce heat exchange medium into the heat exchange chambers 13 of multiple individual cells 100, and the liquid outlet plate 201b is used to discharge the heat exchange medium in the heat exchange chambers 13 of multiple individual cells 100. This simplifies the structure of the flow channel plate assembly 200. Furthermore, since the heat exchange medium in the heat exchange chambers 13 of multiple individual cells 100 comes from the same source, the heat dissipation uniformity among multiple individual cells 100 is also ensured.

[0079] In summary, the battery pack provided in this application embodiment may include at least the following advantages:

[0080] In this embodiment, the single battery cell includes a casing and an electrode core. The electrode core includes a top surface, a bottom surface, a first side surface, and a second side surface. The area of ​​the second side surface is larger than that of the first side surface, so the second side surface is more likely to expand during the operation of the single battery cell. The casing is connected to the heat exchange section through the body to form a heat exchange cavity for the flow of heat exchange medium. Since the heat exchange cavity is opposite to the bottom surface, the first side surface, and part of the top surface of the electrode core, that is, the heat exchange cavity is not opposite to the second side surface, this structure can avoid the heat exchange cavity space being squeezed due to the expansion of the second side surface of the electrode core, reduce the risk of the heat exchange medium being blocked in the heat exchange cavity and affecting the flow efficiency of the heat exchange medium, and ensure the heat dissipation efficiency and charge and discharge performance of the battery pack.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack having a first direction (X), a second direction (Y), and a third direction (Z) perpendicular to each other two by two, characterized in that, The battery pack includes: individual battery cells (100); The single cell (100) includes a casing (10) and an electrode core (20); The pole core (20) includes a top surface (21), a bottom surface (22), two first side surfaces (23) and two second side surfaces (24). The top surface (21) and the bottom surface (22) are arranged opposite each other along the third direction (Z). The two first side surfaces (23) are arranged opposite each other along the first direction (X). The two second side surfaces (24) are arranged opposite each other along the second direction (Y). The area of ​​the second side surface (24) is larger than the area of ​​the first side surface (23). The housing (10) includes a body part (11) and a heat exchange part (12). The body part (11) has a receiving cavity, and the pole core (20) is disposed in the receiving cavity. The heat exchange part (12) is connected to the side of the body part (11) away from the pole core (20) and surrounds the body part (11) to form a heat exchange cavity (13). The heat exchange cavity (13) is disposed opposite to the bottom surface (22), the first side surface (23) and part of the top surface (21) of the pole core (20).

2. The battery pack of claim 1, wherein, The main body (11) includes a top plate (111), a bottom plate (112), a first side plate (113), and a second side plate (114) for enclosing and forming the receiving cavity. The top plate (111), the bottom plate (112), the first side plate (113), and the second side plate (114) are respectively disposed opposite to the top surface (21), the bottom surface (22), the first side surface (23), and the second side surface (24) of the pole core (20). The heat exchange section (12) is connected to the bottom plate (112), the first side plate (113) and part of the top plate (111).

3. The battery pack of claim 2, wherein, The pole core (20) includes a first pole post (25) and a second pole post (26), the first pole post (25) and the second pole post (26) are spaced apart on the top surface (21) along the first direction (X) and exposed on the top plate (111); The heat exchange section (12) includes a main body section (121) and two bend sections (122) connected to each other, and the two bend sections (122) are respectively connected to the two ends of the main body section (121); The main body (121) is connected to the base plate (112) and the first side plate (113), one of the bending parts (122) is connected to the side of the first pole post (25) away from the second pole post (26), and the other bending part (122) is connected to the side of the second pole post (26) away from the first pole post (25).

4. The battery pack of claim 3, wherein, The heat exchange section (12) is provided with a medium inlet (123) and a medium outlet (124). The medium inlet (123) is located in one of the two bends (122), and the medium outlet (124) is located in the other of the two bends (122). The medium inlet (123) is used to introduce the heat exchange medium into the heat exchange cavity (13), and the medium outlet (124) is used to discharge the heat exchange medium out of the heat exchange cavity (13).

5. The battery pack of claim 1, wherein, The heat exchange section (12) has a dimension of W1 along the second direction (Y), and the body section (11) has a dimension of W2 along the second direction (Y), satisfying: W1≤W2.

6. The battery pack of claim 2, wherein, The battery pack also includes a flow channel plate assembly (200), which includes a flow channel plate (201) and a first medium flow channel (202) thereon. The single cell (100) also includes a first fastener (30), which has a second medium flow channel (31) thereon. The first fastener (30) is connected to the flow channel plate (201) and the heat exchange part (12), and communicates the first medium flow channel (202) and the heat exchange chamber (13) through the second medium flow channel (31).

7. The battery pack of claim 6, wherein, The first fastener (30) has a first opening (32) and a second opening (33). The second medium flow channel (31) communicates with the first medium flow channel (202) through the first opening (32) and with the heat exchange chamber (13) through the second opening (33). The first fastener (30) includes a first end and a second end disposed opposite to each other along the third direction (Z), the first end being close to the heat exchange part (12), the first opening (32) being disposed between the first end and the second end, and the second opening (33) being disposed at the first end.

8. The battery pack of claim 6, wherein, The heat exchange section (12) is provided with a medium inlet (123) and a medium outlet (124). The single cell (100) includes two first fasteners (30). The flow channel plate (201) includes a liquid inlet plate (201a) and a liquid outlet plate (201b). The liquid inlet plate (201a) has a liquid inlet cavity, and the liquid outlet plate (201b) has a liquid outlet cavity. The second medium flow channel (31) of one of the first fasteners (30) is connected to the medium inlet (123) and the liquid inlet cavity, and the second medium flow channel (31) of the other first fastener (30) is connected to the medium outlet (124) and the liquid outlet cavity.

9. The battery pack of claim 8, wherein, The number of individual cells (100) is multiple, and the multiple individual cells (100) are arranged at intervals along the first direction (X) and the second direction (Y); wherein, the medium inlet (123) or medium outlet (124) of two adjacent individual cells (100) along the first direction (X) is arranged close to each other, and adjacent individual cells (100) along the first direction (X) share a liquid inlet plate (201a), and / or, adjacent individual cells (100) along the first direction (X) share a liquid outlet plate (201b).

10. The battery pack of claim 7, wherein, The single cell (100) also includes a second fastener (40), the second end of the first fastener (30) passing through the flow channel plate (201) and locked by the second fastener (40).

11. The battery pack of claim 10, wherein, The monomer battery (100) further comprises a first sealing ring (50) and a second sealing ring (60), the first sealing ring (50) is connected between the flow channel plate (201) and the heat exchange part (12), and the second sealing ring (60) is connected between the flow channel plate (201) and the second fastener (40).

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