Heat dissipation member, energy storage device and electric apparatus

Abstract

Disclosed in the present application are a heat dissipation member, an energy storage device and an electric apparatus. The heat dissipation member comprises a first heat dissipation portion and at least one second heat dissipation portion, wherein the first heat dissipation portion and the second heat dissipation portion are connected, and a transition section is formed; a liquid intake channel and a liquid output channel of the heat dissipation member are located inside the first heat dissipation portion and the second heat dissipation portion and pass through the transition section; two harmonica-shaped tubes are provided inside the transition section and have flow channel cavities, which are respectively in communication with the liquid intake channel and the liquid output channel; a first wall and a second wall of each harmonica-shaped tube are provided opposite each other; a third wall and a fourth wall of each harmonica-shaped tube are provided opposite each other; the first heat dissipation portion comprises a first heat dissipation plate and a second heat dissipation plate, which are arranged opposite each other; the second heat dissipation portion comprises a third heat dissipation plate and a fourth heat dissipation plate, which are arranged opposite each other; the first heat dissipation plate is connected to the third heat dissipation plate; and the second heat dissipation plate is connected to the fourth heat dissipation plate. The heat dissipation member in the present application can improve the structural strength of a corresponding transition section of the heat dissipation member.

Description

Heat dissipation components, energy storage devices and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 29, 2023, with application number 2023107857096 and application name “Heat dissipation element, energy storage device and electrical equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of energy storage technology, and in particular to a heat sink, an energy storage device, and an electrical device. Background Art

[0003] The energy storage device generally includes a battery cell module, a heat sink and a box body. The box body includes a receiving cavity, and the battery cell module and the heat sink are located in the receiving cavity of the box body. The battery cell module is composed of a plurality of battery cells stacked together. The heat sink has a cooling channel, and the heat sink is attached to the outer surface of the battery cell module to dissipate heat from the battery cell module. In the prior art, in order to dissipate heat from multiple surfaces of the battery cell module, the heat sink usually needs to be bent, but the bending part is prone to local deformation or even fracture due to stress concentration, making it difficult for the cooling medium in the heat sink to pass through the bending part of the heat sink, affecting the heat dissipation effect of the heat sink.

[0004] Summary of the Invention

[0005] The present application provides a heat sink, an energy storage device, and an electrical device, which can improve the structural strength of the heat sink corresponding to the bending portion, and avoid local deformation or breakage of the heat sink after the bending process.

[0006] In a first aspect, the present application provides a heat sink, comprising a first heat sink and at least one second heat sink, wherein the first heat sink and the at least one second heat sink are connected, a transition section is formed between the first heat sink and the at least one second heat sink, and the heat sink is provided with a liquid inlet channel and a liquid outlet channel, wherein the liquid inlet channel and the liquid outlet channel are located inside the first heat sink and the at least one second heat sink and pass through the transition section;

[0007] Two harmonica tubes are provided inside the transition section, and the two harmonica tubes are respectively located in the liquid inlet channel and the liquid outlet channel, and each of the harmonica tubes has a flow channel cavity, and the flow channel cavity of the harmonica tube located in the liquid inlet channel is communicated with the liquid inlet channel, and the flow channel cavity of the harmonica tube located in the liquid outlet channel is communicated with the liquid outlet channel;

[0008] The harmonica tube includes a first wall, a second wall, a third wall and a fourth wall, wherein the first wall and the second wall are arranged opposite to each other along the height direction of the heat sink, and the third wall and the fourth wall are connected between the first wall and the second wall and are arranged opposite to each other along the thickness direction of the heat sink;

[0009] The first heat dissipation part includes a first heat dissipation plate and a second heat dissipation plate, and the first heat dissipation plate and the second heat dissipation plate are arranged opposite to each other. The second heat dissipation part includes a third heat dissipation plate and a fourth heat dissipation plate, and the third heat dissipation plate and the fourth heat dissipation plate are arranged opposite to each other. The first heat dissipation plate is connected to the third heat dissipation plate, and the second heat dissipation plate is connected to the fourth heat dissipation plate.

[0010] In a second aspect, the present application provides an energy storage device, comprising a box, a battery cell module and the heat sink as described above, wherein the box is provided with a liquid inlet through-hole and a liquid outlet through-hole, the heat sink and the battery cell module are accommodated inside the box, the heat sink is adhered to the surface of the battery cell module, the liquid inlet channel is connected to the liquid inlet through-hole, and the liquid outlet channel is connected to the liquid outlet through-hole.

[0011] In a third aspect, the present application provides an electrical device comprising the energy storage device as described above.

[0012] By providing a harmonica tube at the junction of the first and second heat dissipation sections, the present application enhances the structural strength of the heat dissipation section at the junction of the first and second heat dissipation sections, thereby preventing the transition section between the first and second heat dissipation sections from fracturing when the section is bent. By defining the dimensional relationship between the heat dissipation section and the harmonica tube, the heat dissipation section and the harmonica tube meet strength requirements, thereby preventing excessive stress concentration in the transition section of the heat dissipation section or the harmonica tube when the heat dissipation section and the harmonica tube are bent, thereby preventing local deformation or fracturing of the transition section or the harmonica tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without any creative work.

[0014] FIG1 is a schematic structural diagram of an energy storage device provided in an embodiment of the present application;

[0015] FIG2 is a schematic diagram of the exploded structure of the energy storage device shown in FIG1 ;

[0016] FIG3 is a schematic structural diagram of a heat sink of the energy storage device shown in FIG2 ;

[0017] FIG4 is a schematic structural diagram of a heat sink of the energy storage device shown in FIG3 at a second angle;

[0018] FIG5 is a schematic structural diagram of the heat dissipation element of the energy storage device shown in FIG3 from a third angle;

[0019] FIG6 is an enlarged structural diagram of the M portion of the heat sink shown in FIG5 ;

[0020] FIG7 is a schematic diagram of a cross-sectional structure of the heat sink shown in FIG5 along the AA direction;

[0021] FIG8 is an enlarged structural diagram of part N of the heat sink shown in FIG7 ;

[0022] FIG9 is a schematic diagram showing the dimensions of the harmonica tube shown in FIG8 .

[0023] Explanation of the accompanying symbols: 1000-energy storage device, 300-box, 200-battery cell module, 100-heat sink, 310-cover, 320-bottom shell, 321-liquid inlet hole, 322-liquid outlet hole, 210-battery cell, 220-connecting plate, 230-fixing part, A-battery cell group, 10-heat sink, 30-liquid inlet pipe, 40-liquid outlet pipe, 11-first heat sink, 12-second heat sink, 111-first heat sink, 112 -Second heat sink, 113-liquid inlet, 114-liquid outlet, 121-third heat sink, 122-fourth heat sink, 13-transition section, 131-first transition section, 132-second transition section, 20-harmonica tube, 21-first wall, 22-second wall, 23-third wall, 24-fourth wall, 25-reinforcement rib, 251-first reinforcement rib, 252-second reinforcement rib, 253-third reinforcement rib, 26-flow channel cavity. DETAILED DESCRIPTION

[0024] Because the energy people need is highly temporal and spatially dependent, rationally utilizing energy and improving its efficiency requires a medium or device that can store one form of energy in the same form or convert it into another, allowing it to be released in a specific form based on future application needs. As we all know, to achieve the goal of carbon neutrality, the primary method for generating green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels. Currently, green electricity generation generally relies on photovoltaics, wind power, and hydropower. However, wind and solar power are generally intermittent and volatile, leading to grid instability, insufficient power during peak hours, and excessive power during off-peak hours. Unstable voltage can also damage electricity. Therefore, insufficient electricity demand or insufficient grid capacity can lead to "wind and solar curtailment." Addressing these issues requires energy storage. That is, electrical energy is converted into other forms of energy through physical or chemical means and stored, and then the energy is converted into electrical energy and released when needed. Simply put, energy storage is like a large "power bank". When there is sufficient photovoltaic and wind energy, electrical energy is stored and the stored electricity is released when needed.

[0025] The present application provides an energy storage device, which includes a group of chemical batteries. The energy storage device mainly uses the chemical elements in the chemical batteries as energy storage media. The charging and discharging processes are accompanied by chemical reactions or changes in the energy storage media. Simply put, the electricity generated by wind and solar energy is stored in the chemical batteries. When the use of external electricity reaches a peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0026] The energy storage device provided in this application has a wide range of applications, including energy storage on the (wind and solar) generation side, grid side, base station side, and user side. Energy storage devices are typically used in the form of energy storage containers, small and medium-sized energy storage cabinets, and small household energy storage boxes. Energy storage containers, small and medium-sized energy storage cabinets, and small household energy storage boxes, among other devices, contain energy storage devices.

[0027] It should be noted that the above-mentioned energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes and other equipment containing energy storage devices can be understood as electrical equipment.

[0028] There may be multiple energy storage devices 1000, which are connected in series or in parallel. In this embodiment, "multiple" refers to two or more.

[0029] It is understood that the energy storage device 1000 may include, but is not limited to, single cells, battery modules, battery packs, and battery systems. The energy storage device 1000 provided in the embodiments of this application may be, but is not limited to, the products listed above, or may be implemented in other forms. The embodiments of this application do not impose strict limitations on the application of the energy storage device 1000. The embodiments of this application illustrate the energy storage device 1000 as a multi-cell battery.

[0030] Referring to Figures 1 and 2 , in this embodiment, the energy storage device 1000 includes a housing 300, a cell module 200, and a heat sink 100. The housing 300 includes a cover 310 and a bottom housing 320. The bottom housing 320 is provided with a liquid inlet hole 321 and a liquid outlet hole 322. The cell module 200 and the heat sink 100 are fixed to the bottom housing 320. The cover 310 is provided over the cell module 200 and the heat sink 100 and is fixedly connected to the bottom housing 320 to enclose the cell module 200 and the heat sink 100 within the housing 300.

[0031] For the convenience of description, the length direction of the heat sink 100 shown in Figure 2 is defined as the X-axis direction, the width direction of the heat sink 100 is defined as the Y-axis direction, and the height direction of the heat sink 100 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other. The directional terms such as "upper" and "lower" mentioned in the description of the embodiment of the present application are based on the description shown in Figure 2 of the specification, with the positive direction of the Z-axis being "upper" and the negative direction of the Z-axis being "lower". It does not constitute a limitation on the actual application scenario of the heat sink 100. The terms "same", "equal" or "parallel" used in the following text are allowed to have a certain tolerance.

[0032] In this embodiment, the battery module 200 includes a plurality of battery cells 210, a plurality of connecting pieces 220 and a fixing portion 230. The plurality of battery cells 210 are divided into four battery cell groups A, and the number of battery cells 210 in each battery cell group A is equal and arranged in sequence along the length direction (X-axis direction) of the battery cell module 200. The four battery cell groups A are arranged side by side along the width direction (Y-axis direction) of the battery cell module 200. The plurality of connecting pieces 220 connect the plurality of battery cells 210 to each other, and the fixing portion 230 is arranged on the periphery of the four battery cell groups A, and is used to fasten and connect the four battery cell groups A, connecting the four battery cell groups A into an integrated structure. Specifically, the fixing portion 230 is a plastic steel belt. In other embodiments, the plurality of battery cells 210 can also be divided into one, two or more battery cell groups A; the fixing portion 230 can also be a fixing plate; it is determined according to actual use requirements, and this application does not impose specific restrictions on this.

[0033] Referring to Figures 3 to 5 , an embodiment of the present application provides a heat sink 100. In this embodiment, the heat sink 100 includes a heat sink portion 10, a harmonica tube, a liquid inlet pipe 30, and a liquid outlet pipe 40. The harmonica tube is located within the heat sink portion 10, and the liquid inlet pipe 30 and the liquid outlet pipe 40 are connected to the heat sink portion 10.

[0034] The heat dissipation portion 10 includes a first heat dissipation portion 11 and at least one second heat dissipation portion 12. The first heat dissipation portion 11 and the at least one second heat dissipation portion 12 are connected. Specifically, in this embodiment, there are two second heat dissipation portions 12. The two second heat dissipation portions 12 are respectively connected to opposite ends of the first heat dissipation portion 11 along the length direction, and both second heat dissipation portions 12 are arranged at an angle to the first heat dissipation portion 11.

[0035] It should be noted that, in other embodiments, the number of the second heat dissipation parts 12 may also be one or more, and this application does not impose any specific limitation on the number of the second heat dissipation parts 12 .

[0036] In this embodiment, the first heat dissipation portion 11 includes a first heat dissipation plate 111 and a second heat dissipation plate 112. The first heat dissipation plate 111 is provided with a liquid inlet 113 and a liquid outlet 114. The liquid inlet 113 passes through two surfaces of the first heat dissipation plate 111 that are arranged opposite to each other in the thickness direction, and the liquid outlet 114 passes through two surfaces of the first heat dissipation plate 111 that are arranged opposite to each other in the thickness direction. Along the height direction (Z-axis direction) of the first heat dissipation portion 11, the liquid inlet 113 and the liquid outlet 114 are spaced apart. Along the thickness direction of the first heat dissipation portion 11, the first heat dissipation plate 111 and the second heat dissipation plate 112 are arranged opposite to each other, and a first liquid inlet channel and a first liquid outlet channel are formed between the first heat dissipation plate 111 and the second heat dissipation plate 112. The first liquid inlet channel and the first liquid outlet channel extend along the length direction of the first heat dissipation portion 11, and the first liquid inlet channel and the first liquid outlet channel are spaced apart in the height direction of the first heat dissipation portion 11. The first liquid inlet channel is connected to the liquid inlet 113, and the first liquid outlet channel is connected to the liquid outlet 114. The thickness of the first heat dissipation plate 111 and the second heat dissipation plate 112 are both D0.

[0037] The second heat dissipation portion 12 includes a third heat dissipation plate 121 and a fourth heat dissipation plate 122. The third heat dissipation plate 121 and the fourth heat dissipation plate 122 are arranged opposite each other along the thickness direction of the second heat dissipation portion 12, and a second liquid inlet channel and a second liquid outlet channel are formed between the third heat dissipation plate 121 and the fourth heat dissipation plate 122. The second liquid inlet channel and the second liquid outlet channel extend along the length direction of the second heat dissipation portion 12, and the second liquid inlet channel and the second liquid outlet channel are spaced apart along the height direction (Z-axis direction) of the second heat dissipation portion 12, and the second liquid inlet channel and the second liquid outlet channel are connected. The thickness dimension of the third heat dissipation plate 121 and the fourth heat dissipation plate 122 is both D0, and the thickness dimension of the third heat dissipation plate 121 and the fourth heat dissipation plate 122 is equal to the thickness dimension of the first heat dissipation plate 111 and the second heat dissipation plate 112.

[0038] The first heat dissipation portion 11 is connected to at least one second heat dissipation portion 12, and a transition section 13 is formed between the first heat dissipation portion 11 and at least one second heat dissipation portion 12. Specifically, in this embodiment, the two second heat dissipation portions 12 are respectively connected to the opposite ends of the first heat dissipation portion 11 along the length direction, and the two second heat dissipation portions 12 are arranged opposite to each other along the width direction (Y-axis direction) of the heat dissipation element 100; the first heat dissipation portion 11 is connected between the two second heat dissipation portions 12. The two second heat dissipation portions 12 are perpendicular to the first heat dissipation portion 11 (a certain process tolerance is allowed). Specifically, the first heat dissipation plate 111 is respectively connected to the two third heat dissipation plates 121 at the opposite ends along the length direction of the first heat dissipation portion 11, and the first heat dissipation plate 111 and the third heat dissipation plate 121 are arranged at an angle, and the angle is arc-shaped; the second heat dissipation plate 112 is respectively connected to the two fourth heat dissipation plates 122 at the opposite ends along the length direction of the first heat dissipation portion 11, and the second heat dissipation plate 112 and the fourth heat dissipation plate 122 are arranged at an angle, and the angle is arc-shaped. It can be understood that the heat dissipation portion 10 as a whole is equivalent to being in a "U" shape, and the connection between the first heat dissipation portion 11 and the two second heat dissipation portions 12 respectively forms two transition sections 13, specifically a first transition section 131 and a second transition section 132. The first transition section 131 and the second transition section 132 are both arc-shaped structures. The first transition section 131 and the second transition section 132 are both part of the first heat dissipation portion 11, and are respectively located at opposite ends of the first heat dissipation portion 11 along the length direction. The two second heat dissipation portions 12 are connected to the first heat dissipation portion 11 through the first transition section 131 and the second transition section 132 respectively. The first liquid inlet channel is connected to the two second liquid inlet channels at opposite ends along the length direction of the first heat dissipation portion 11 to form a liquid inlet channel; the first liquid outlet channel is connected to the two second liquid outlet channels at opposite ends along the length direction of the first heat dissipation portion 11 to form a liquid outlet channel; the ends of the two second liquid inlet channels facing away from the first liquid inlet channel are connected to the ends of the two second liquid outlet channels facing away from the first liquid outlet channel. The liquid inlet and outlet channels are located within the first heat dissipation portion 11 and at least one second heat dissipation portion 12. Specifically, in this embodiment, the liquid inlet and outlet channels are located within the first heat dissipation portion 11 and the two second heat dissipation portions 12. The liquid inlet and outlet channels pass through a transition section 13 between the first heat dissipation portion 11 and the second heat dissipation portion 12.

[0039] It should be noted that in this embodiment, the first heat dissipation portion 11 and the two second heat dissipation portions 12 are integrally formed metal structures; the two second heat dissipation portions 12 are bent relative to the first heat dissipation portion 11 to form a "U"-shaped heat dissipation portion 10, and respectively form a first transition section 131 and a second transition section 132; it can be understood that the first transition section 131 and the second transition section 132 are each part of the first heat dissipation portion 11 and are respectively located at opposite ends of the first heat dissipation portion 11 along the length direction. The two transition sections 13 are formed by bending the two second heat dissipation portions 12 relative to the first heat dissipation portion 11. The first transition section 131 and the second transition section 132 are respectively located at the connection between the two second heat dissipation portions 12 and the first heat dissipation portion 11, and the two second heat dissipation portions 12 are connected to the first heat dissipation portion 11 via the first transition section 131 and the second transition section 132.

[0040] The liquid inlet pipe 30 is a hollow pipe with two open ends. One end of the liquid inlet pipe 30 is connected to the liquid inlet port 113, and the other end is connected to the liquid inlet through hole 321 of the bottom shell 320. The liquid outlet pipe 40 is a hollow pipe with two open ends. One end of the liquid outlet pipe 40 is connected to the liquid outlet port 114, and the other end is connected to the liquid outlet through hole 322 of the bottom shell 320.

[0041] Referring to Figures 5 to 9 , in this embodiment, the harmonica tube 20 has an arc-shaped structure. The harmonica tube 20 includes a first wall 21, a second wall 22, a third wall 23, and a fourth wall 24. The first wall 21 and the second wall 22 are disposed opposite each other along the width of the harmonica tube 20. The third wall 23 and the fourth wall 24 are disposed opposite each other along the thickness of the harmonica tube 20 and are connected between the first wall 21 and the second wall 22. The first wall 21, the second wall 22, the third wall 23, and the fourth wall 24 form a flow channel cavity 26 of the harmonica tube 20. The harmonica tube 20 also includes a plurality of reinforcing ribs 25. The plurality of reinforcing ribs 25 are spaced apart along the width of the harmonica tube 20 between the first wall 21 and the second wall 22, and connect the third wall 23 and the fourth wall 24. Specifically, there are three reinforcing ribs 25, including a first reinforcing rib 251, a second reinforcing rib 252, and a third reinforcing rib 253. Along the width direction of the harmonica tube 20, the first reinforcing rib 251, the second reinforcing rib 252 and the third reinforcing rib 253 are arranged in sequence; the second reinforcing rib 252 is located in the middle position of the harmonica tube 20, and the first reinforcing rib 251 and the third reinforcing rib 253 are respectively located on opposite sides of the second reinforcing rib 252, and are spaced apart from the second reinforcing rib 252.

[0042] Specifically, in this embodiment, the first wall 21 of the harmonica tube 20 has a thickness of D1, the second wall 22 has a thickness of D2, the third wall 23 has a thickness of D3, and the fourth wall 24 has a thickness of D4. The first reinforcing rib 251 has a thickness of D5, the second reinforcing rib 252 has a thickness of D6, and the third reinforcing rib 253 has a thickness of D7. Along the width direction of the harmonica tube 20, the distance between the two opposing surfaces of the first wall 21 and the second wall 22 is L1, i.e., the width dimension of the harmonica tube 20 is L1. Along the thickness direction of the harmonica tube 20, the distance between the two opposing surfaces of the third wall 23 and the fourth wall 24 is L2, i.e., the thickness dimension of the harmonica tube 20 is L2.

[0043] In this embodiment, the number of harmonica tubes 20 is four. Two harmonica tubes 20 are provided inside each transition section 13, and the two harmonica tubes 20 are respectively located in the liquid inlet channel and the liquid outlet channel inside each transition section 13. The first wall 21 and the second wall 22 of the harmonica tube 20 are arranged relative to each other along the height direction (Z-axis direction) of the heat sink 100, and the third wall 23 and the fourth wall 24 of the harmonica tube 20 are connected between the first wall 21 and the second wall 22, and are arranged relative to each other along the thickness direction of the heat sink 100. Two of the harmonica tubes 20 are located inside the first transition section 131. Specifically, one of the harmonica tubes 20 is located in the liquid inlet channel inside the first transition section 131, and the flow channel cavity 26 of the harmonica tube 20 is connected to the liquid inlet channel; the other harmonica tube 20 is located in the liquid outlet channel inside the first transition section 131, and the flow channel cavity 26 of the harmonica tube 20 is connected to the liquid outlet channel. The other two harmonica tubes 20 are located inside the second transition section 132. Specifically, one of the harmonica tubes 20 is located in the liquid inlet channel inside the second transition section 132, and the flow channel cavity 26 of the harmonica tube 20 is connected to the liquid inlet channel; the other harmonica tube 20 is located in the liquid outlet channel inside the second transition section 132, and the flow channel cavity 26 of the harmonica tube 20 is connected to the liquid outlet channel.

[0044] Please refer to Figures 4 and 7 in combination. In this embodiment, the flow path of the cooling medium entering the heat sink 100 is: liquid inlet pipe 30 → liquid inlet port 113 → first liquid inlet channel → two harmonica tubes 20 → two second liquid inlet channels → two second liquid outlet channels → two harmonica tubes 20 → first liquid outlet channel → liquid outlet 114 → liquid outlet pipe 40.

[0045] It can be understood that by respectively arranging the harmonica tube 20 at the connection between the first heat dissipation part 11 and the two second heat dissipation parts 12, the structural strength of the connection between the heat dissipation part 10 corresponding to the first heat dissipation part 11 and the two second heat dissipation parts 12 can be enhanced, that is, the structural strength of the position of the heat dissipation part 10 corresponding to the two transition sections 13 can be enhanced, thereby avoiding the first transition section 131 or the second transition section 132 from being easily broken when bending to form the first transition section 131 and the second transition section 132.

[0046] The first heat dissipation portion 11 has a tensile strength greater than or equal to 130 MPa (megapascals), a yield strength less than or equal to 57.6 MPa, and an elongation at break greater than or equal to 30.6%. The second heat dissipation portion 12 has a tensile strength greater than or equal to 130 MPa, a yield strength less than or equal to 57.6 MPa, and an elongation at break greater than or equal to 30.6%. Specifically, in this embodiment, the first heat dissipation portion 11 has a tensile strength of 130 MPa, a yield strength of 57.6 MPa, and an elongation at break of 30.6%. The second heat dissipation portion 12 has a tensile strength of 130 MPa, a yield strength of 57.6 MPa, and an elongation at break of 30.6%. The harmonica tube 20 has a tensile strength of 121.8 MPa, a yield strength of 61.3 MPa, and an elongation at break of 36.2%.

[0047] In this embodiment, the transition section 13 is formed by bending at the junction of the first heat dissipation portion 11 and the second heat dissipation portion 12. To ensure that the transition section 13 and the harmonica tube 20 inside the transition section 13 bend evenly and do not break, a simulation was conducted to examine the effect of the relationship between multiple dimensions of the heat dissipation portion 10 and the harmonica tube 20 on the mechanical properties of the heat dissipation element 100. The multiple dimensions include: the thickness D0 of the first heat dissipation plate 111, the second heat dissipation plate 112, the third heat dissipation plate 121, and the fourth heat dissipation plate 122; the width L1 of the harmonica tube 20; the thickness L2 of the harmonica tube 20; the thickness D1 of the first wall 21; the thickness D2 of the second wall 22; the thickness D3 of the third wall 23; the thickness D4 of the fourth wall 24; the thickness D5 of the first reinforcing rib 251; the thickness D6 of the second reinforcing rib 252; and the thickness D7 of the third reinforcing rib 253.

[0048] The mechanical properties of the heat sink 100 provided in the embodiment of the present application were simulated. Specifically, the simulation conditions were as follows: changing the value of one dimensional relationship, controlling the other dimensions to their optimal values, bending the second heat sink 12 to form a 90° angle relative to the first heat sink 11 (allowing for a certain process tolerance), and obtaining the stress and plastic strain values ​​of the transition section 13 formed by the bending of the heat sink 10, as well as the stress and plastic strain values ​​of the harmonica tube 20.

[0049] It should be noted that before simulating the mechanical properties of the heat sink 100, multiple tests were conducted to determine the optimal values ​​for L1, L2, D0, D1, D2, D3, D4, D5, D6, and D7. When L1, L2, D0, D1, D2, D3, D4, D5, D6, and D7 were 20 mm, 3.2 mm, 0.8 mm, 0.6 mm, 0.6 mm, 0.4 mm, 0.4 mm, 0.5 mm, 0.47 mm, and 0.5 mm, respectively, the stress and plastic strain values ​​of the transition section 13 formed by the bending of the heat sink 10, as well as the stress and plastic strain values ​​of the harmonica tube 20, were minimized. Specifically, the stress value of the transition section 13 of the heat sink 10 was 90 MPa, and the plastic strain value was 10%. The stress value of the harmonica tube 20 was 92 MPa, and the plastic strain value was 15%.

[0050] Table 1: Mechanical performance simulation results of the heat sink of the embodiment of the present application

[0051] According to the mechanical property simulation results of the heat dissipation component 100 provided by the embodiments of the present application, when D0, D1, D2, D3, D4, D5, D6, and D7 are respectively 0.8mm, 0.6mm, 0.6mm, 0.4mm, 0.4mm, 0.5mm, 0.47mm, and 0.5mm, and 5% < L2 / L1 < 32%, the maximum stress of the transition section 13 formed by bending the heat dissipation part 10 is 125 MPa, which is less than the tensile strength 130 MPa of the heat dissipation part 10. Therefore, the heat dissipation part 10 can undergo uniform bending under stress and will not undergo local plastic deformation caused by stress concentration; the maximum plastic strain of the transition section 13 of the heat dissipation part 10 is 29%, which is less than the elongation at break 30.6% of the heat dissipation part 10. Therefore, under stress, the transition section 13 will not break. The maximum stress of the bent harmonica tube 20 is 113 Mpa, which is less than the tensile strength 121.8 MPa of the harmonica tube 20. Therefore, the harmonica tube 20 can undergo uniform bending under stress and will not undergo local plastic deformation caused by stress concentration; the maximum plastic strain of the bent harmonica tube 20 is 33%, which is less than the elongation at break 36.2% of the harmonica tubeWhen L1, L2, D0, D2, D3, D4, and D6 all take the optimal values, satisfying 80% D1 < D5 = D7 < 90% D1, the transition section 13 of the heat dissipation part 10 and the corrugated tube 20 can be evenly bent without breaking. When L1, L2, D0, D2, D3, D4, D5, and D7 all take the optimal values, satisfying 60% D1 < D6 < 80% D1, the transition section 13 of the heat dissipation part 10 and the corrugated tube 20 can be evenly bent without breaking. In addition, it can be seen from the simulation effect diagram that under the condition of satisfying the above relational expressions, the bending of several reinforcing ribs 25 of the corrugated tube 20 will not affect the flow channel cavity 26.

[0052] It can be understood that neither the heat dissipation part 10 nor the corrugated tube 20 will have stress concentration under the action of bending stress, resulting in local plastic deformation. Therefore, the connection of the first liquid inlet channel and the second liquid inlet channel at the position where the transition section 13 is located, the connection of the first liquid outlet channel and the second liquid outlet channel, and the flow cross-sectional area of the liquid inlet channel and the liquid outlet channel are ensured, thereby ensuring the smooth flow of the cooling medium in the liquid inlet channel and the liquid outlet channel; avoiding local plastic deformation of the heat dissipation part 10 or the corrugated tube 20, reducing the flow cross-sectional area of the liquid inlet channel or the liquid outlet channel, and further avoiding increasing the flow resistance of the cooling medium in the liquid inlet channel or the liquid outlet channel. In addition, neither the heat dissipation part 10 nor the corrugated tube 20 will break under the action of bending stress, avoiding affecting the flow of the cooling medium in the liquid inlet channel or the liquid outlet channel.

[0053] In addition, the thickness dimension D5 of the first reinforcing rib 251 and the thickness dimension D7 of the third reinforcing rib 253 in the corrugated tube 20 are equal, which can ensure that the strengths of the first reinforcing rib 251 and the third reinforcing rib 253 are equal, avoiding the situation where when stress is applied to the corrugated tube 20 to make it bend, the strengths of the first reinforcing rib 251 or the third reinforcing rib 253 are not equal, resulting in the crushing of the reinforcing rib 25 with weaker strength. The thickness dimension D6 of the second reinforcing rib 252 is smaller than the thickness dimension D5 of the first reinforcing rib 251 and the thickness dimension D7 of the third reinforcing rib 253, which can make the structural strength in the middle of the corrugated tube 20 lower, facilitating the bending of the corrugated tube 20. Moreover, the thickness D6 of the second reinforcing rib 252 being smaller than the thickness D5 of the first reinforcing rib 251 and the thickness D7 of the third reinforcing rib 253 can also save the material cost of the corrugated tube 20.

[0054] Please continue to refer to Figure 2. In this embodiment, the heat dissipation member 100 is connected to the battery cell module 200. Specifically, the first heat dissipation part 11 of the heat dissipation member 100 is located at the end of the battery cell module 200 along the length direction and is simultaneously in contact with the sides of four battery cell groups A. The two second heat dissipation parts 12 of the heat dissipation member 100 are respectively located between the two middle battery cell groups A and the two adjacent outer battery cell groups A, and each second heat dissipation part 12 is respectively in contact with the surfaces of the battery cell groups A on both sides.

[0055] It should be noted that, in this embodiment, the number of the second heat dissipation parts 12 is two; in other embodiments, the number of the second heat dissipation parts 12 can also be one or more, as long as the second heat dissipation parts 12 are attached to the surface of the battery cell group A.

[0056] In this embodiment, the battery cell module 200 and the heat sink 100 are installed in the housing 300. Specifically, the battery cell module 200 is fixed to the bottom shell 320, and the heat sink 100 is fixed to the bottom shell 320. The liquid inlet pipe 30 of the heat sink 100 is connected to the liquid inlet hole 321 of the bottom shell 320, and the liquid outlet pipe 40 of the heat sink 100 is connected to the liquid outlet hole 322 of the bottom shell 320. The cooling medium can be supplied to the heat sink 100 through the liquid inlet hole 321 of the bottom shell 320, and the cooling medium can be discharged from the heat sink 100 through the liquid outlet hole 322 of the bottom shell 320.

[0057] It should be noted that the cooling medium flowing in the heat sink 100 includes but is not limited to cooling water, and may also be other media, which is determined according to the specific usage.

[0058] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A heat sink, wherein: The heat dissipation element comprises a first heat dissipation portion and at least one second heat dissipation portion, wherein the first heat dissipation portion and the at least one second heat dissipation portion are connected, and a transition section is formed between the first heat dissipation portion and the at least one second heat dissipation portion, and the heat dissipation element is provided with a liquid inlet channel and a liquid outlet channel, and the liquid inlet channel and the liquid outlet channel are located inside the first heat dissipation portion and the at least one second heat dissipation portion and pass through the transition section; Two harmonica tubes are arranged inside the transition section, and the two harmonica tubes are respectively located in the liquid inlet channel and the liquid outlet channel, and each of the harmonica tubes has a flow channel cavity, and the flow channel cavity of the harmonica tube located in the liquid inlet channel is communicated with the liquid inlet channel, and the flow channel cavity of the harmonica tube located in the liquid outlet channel is communicated with the liquid outlet channel; The harmonica pipe comprises a first wall, a second wall, a third wall and a fourth wall, wherein the first wall and the second wall are arranged opposite to each other along the height direction of the heat sink, and the third wall and the fourth wall are connected between the first wall and the second wall and are arranged opposite to each other along the thickness direction of the heat sink; The first heat dissipation part includes a first heat dissipation plate and a second heat dissipation plate, the first heat dissipation plate and the second heat dissipation plate are arranged opposite to each other, the second heat dissipation part includes a third heat dissipation plate and a fourth heat dissipation plate, the third heat dissipation plate and the fourth heat dissipation plate are arranged opposite to each other, the first heat dissipation plate is connected to the third heat dissipation plate, and the second heat dissipation plate is connected to the fourth heat dissipation plate.

2. The heat sink according to claim 1, wherein: The thickness of the first heat sink, the second heat sink, the third heat sink and the fourth heat sink are equal and are all D0, the thickness of the first wall is D1, the thickness of the second wall is D2, and D0, D1 and D2 satisfy the relationship: 40%D0 <D1=D2<80%D0。 3. The heat sink according to claim 1, wherein: The width dimension of the harmonica tube is L1, and the thickness dimension of the harmonica tube is L2. L1 and L2 satisfy the relationship: 5% <L2 / L1<32%。 4. The heat sink according to claim 1, wherein: The thickness of the first heat sink, the second heat sink, the third heat sink and the fourth heat sink are equal and are all D0. The thickness of the harmonica tube is L2. D0 and L2 satisfy the relationship: 10%<D0 / L2<40%.

5. The heat sink according to claim 1, wherein: The thickness dimension of the first wall is D1, the thickness dimension of the third wall is D3, and the thickness dimension of the fourth wall is D4. D1, D3 and D4 satisfy the relationship: 60% D1 <D3≤D4<90%D1。 6. The heat sink according to any one of claims 1 to 5, wherein: The harmonica tube further comprises a first reinforcing rib, a second reinforcing rib and a third reinforcing rib, wherein the first reinforcing rib, the second reinforcing rib and the third reinforcing rib are located between the third wall and the fourth wall, and along the width direction of the harmonica tube, the first reinforcing rib, the second reinforcing rib and the third reinforcing rib are arranged in sequence and spaced apart; The thickness dimension of the first reinforcing rib is D5, the thickness dimension of the second reinforcing rib is D6, and the thickness dimension of the third reinforcing rib is D7. D5, D6 and D7 satisfy the relationship: D6<D5=D7.

7. The heat sink according to claim 6, wherein: The thickness dimension of the first wall is D1, the thickness dimension D5 of the first reinforcing rib, the thickness dimension D7 of the third reinforcing rib and the thickness dimension D1 of the first wall satisfy the relationship: 80% D1 <D5=D7<90%D1。 8. The heat sink according to claim 6, wherein: The thickness dimension of the first wall is D1, and the thickness dimension D6 of the second reinforcing rib satisfies the relationship D1 of the thickness dimension of the first wall: 60% D1 <D6<80%D1。 9. The heat sink according to claim 6, wherein: The number of the second heat dissipation parts is two, the two second heat dissipation parts are arranged opposite to each other along the width direction of the heat dissipation element, and the first heat dissipation part is connected between the two second heat dissipation parts.

10. An energy storage device, wherein: It comprises a box body, a battery cell module and a heat sink as described in any one of claims 1 to 9, the box body is provided with a liquid inlet through hole and a liquid outlet through hole, the heat sink and the battery cell module are accommodated inside the box body, the heat sink is fitted with the surface of the battery cell module, the liquid inlet channel is connected to the liquid inlet through hole, and the liquid outlet channel is connected to the liquid outlet through hole.

11. An electrical device, wherein: Comprising the energy storage device as claimed in claim 10.

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