Battery pack and electric device

Abstract

This utility model relates to the field of battery technology and discloses a battery pack and an electrical device. The battery pack includes: a housing, at least one battery pack, and at least one heat exchange plate. The housing has a bottom plate. The battery pack is disposed within the housing and includes multiple individual batteries. Each individual battery includes a casing and a cell. The casing has a first wall, a second wall, and a bottom wall. The bottom wall is attached to the bottom plate via an adhesive layer. The first wall and the second wall have transition portions near their respective ends on the bottom wall, and these transition portions connect to the opposite ends of the bottom wall. The distance between the end of the first wall near the bottom wall and the top surface of the bottom plate is H1, and the distance between the end of the second wall near the bottom wall and the top surface of the bottom plate is H2, satisfying H1 > H2 and 1.5mm ≤ H1 ≤ 35mm. The heat exchange plate faces the first wall of the casing. This utility model provides sufficient adhesive overflow space between the first wall and the heat exchange plate, improving the bonding strength of the heat exchange plate and ensuring its heat exchange effect.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs and electrical devices. Background Technology

[0002] New energy batteries have seen rapid development in multiple fields such as power systems, new energy vehicles, and energy storage power stations.

[0003] A battery pack typically contains a battery array, which consists of multiple individual cells. During operation, each individual cell generates a significant amount of heat. To address the heat dissipation needs of these cells, current technology incorporates heat exchange plates on the large surfaces of each cell to ensure efficient heat exchange.

[0004] However, since the heat generated by a single battery cell also causes large-area thermal expansion, the deformation caused by thermal expansion weakens the bonding strength between the heat exchange plate and the battery casing, which can easily cause the heat exchange plate to detach from the casing, ultimately affecting the heat exchange effect. Utility Model Content

[0005] In view of this, the present invention provides a battery pack and power supply device to solve the problem that the bonding strength between the heat exchange plate and the housing of the individual battery is poor, which easily causes the heat exchange plate to detach from the housing and affects the heat exchange effect.

[0006] In a first aspect, this utility model provides a battery pack, comprising:

[0007] The box body is equipped with a bottom plate;

[0008] At least one battery pack is disposed within the housing. The battery pack includes multiple individual cells. Each individual cell includes a housing and a cell disposed within the housing. The housing has a first wall and a second wall perpendicular to the base plate in its height direction. The housing has a bottom wall on the side facing the base plate. The bottom wall is attached to the base plate by an adhesive layer. The first wall and the second wall have transition portions at their ends near the bottom wall, and are connected to the opposite ends of the bottom wall through the transition portions. Along the height direction of the individual cell, the distance between the end of the first wall near the bottom wall and the top surface of the base plate is H1, and the distance between the end of the second wall near the bottom wall and the top surface of the base plate is H2, satisfying H1 > H2 and 1.5mm ≤ H1 ≤ 35mm.

[0009] At least one heat exchange plate is disposed between at least two adjacent individual cells of the battery pack, with the plate surface facing the first wall of the housing.

[0010] Secondly, this utility model also provides an electrical device, including the aforementioned battery pack.

[0011] Beneficial Effects: The battery pack of the above technical solution features a heat exchange plate between at least two adjacent individual cells. This heat exchange plate removes heat generated by the thermal expansion of the cells within the individual cells. By positioning the heat exchange plate with its surface facing the first wall of the individual cell's casing, and controlling H1 > H2 and within a suitable range, sufficient space for adhesive overflow is maintained between the transition area near the first wall, the base plate, and the heat exchange plate. This expands the effective bonding area of ​​the adhesive layer on the heat exchange plate, thereby improving the bonding strength of the heat exchange plate, reducing the risk of the heat exchange plate detaching from the casing, and effectively ensuring the heat exchange effect of the heat exchange plate on the individual cells. If H1 is too large, the effective heat exchange area between the heat exchange plate and the first wall is too small, resulting in poor heat exchange efficiency and low heat dissipation efficiency of the individual cells. If H1 is too small, the space for adhesive overflow between the casing and the heat exchange plate is too small, resulting in poor bonding strength of the heat exchange plate. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model;

[0014] Figure 2 This is a schematic diagram of a single battery cell and a heat exchange plate in a battery pack according to an embodiment of the present invention.

[0015] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0016] Figure 4 This is a partial structural diagram of the casing of a single battery cell in a battery pack according to an embodiment of the present utility model.

[0017] Figure 5 This is a partial structural diagram of the casing of another single battery cell in a battery pack according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Housing; 101. Bottom plate; 102. Side plate; 2. Battery pack; 201. Individual cell; 2011. Casing; 20111. First wall; 20112. Second wall; 20113. Bottom wall; 20114. Transition section; 20115. First rounded corner; 20116. Second rounded corner; 20117. Recessed section; 2012. Cell; 3. Heat exchange plate; 301. Vertical plate; 302. Horizontal plate; 303. Heat exchange channel; 4. Adhesive layer. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0022] According to embodiments of the present invention, on the one hand, such as Figure 1 , Figure 2 and Figure 3 As shown, a battery pack is provided, including: a housing 1, at least one battery pack 2, and at least one heat exchange plate 3. The housing 1 is provided with a bottom plate 101. The battery pack 2 is disposed inside the housing 1, and the battery pack 2 includes a plurality of individual batteries 201. Each individual battery 201 includes a housing 2011 and a cell 2012 disposed inside the housing 2011. The housing 2011 has a first wall 20111 and a second wall 20112 perpendicular to the bottom plate 101 in the height direction. The housing 2011 has a bottom wall 20113 on the side facing the bottom plate 101. The bottom wall 20113 is disposed on the bottom plate 101 through an adhesive layer 4. The first wall 20111 and the second wall 20112 are respectively provided with transition portions 20114 near the bottom wall 20113, and are connected to the opposite ends of the bottom wall 20113 through the transition portions 20114. Along the height direction of the individual cell 201, the distance between the end of the first wall 20111 near the bottom wall 20113 and the top surface of the base plate 101 is H1, and the distance between the end of the second wall 20112 near the bottom wall 20113 and the top surface of the base plate 101 is H2, satisfying H1>H2 and 1.5mm≤H1≤35mm. A heat exchange plate 3 is disposed between at least two adjacent individual cells 201 of the battery pack 2, with the plate surface of the heat exchange plate 3 facing the first wall 20111 of the housing 2011.

[0023] Therefore, the battery pack provided in this embodiment of the present invention has a heat exchange plate 3 disposed between at least two adjacent individual cells 201 of the battery pack 2. The heat exchange plate 3 can remove the heat generated by the thermal expansion of the cell 2012 in the individual cell 201. By positioning the heat exchange plate 3 with its surface facing the first wall 20111 of the housing 2011 of the individual cell 201, and controlling H1 > H2 and within a suitable range, sufficient space for excess adhesive can be left between the transition portion 20114 near the first wall 20111, the bottom plate 101, and the heat exchange plate 3. This expands the effective bonding area of ​​the adhesive layer 4 on the heat exchange plate 3, thereby improving the bonding strength of the heat exchange plate 3, reducing the risk of the heat exchange plate 3 detaching from the housing 2011, and effectively ensuring the heat exchange effect of the heat exchange plate 3 on the individual cell 201. If H1 is too large, the effective heat exchange area between the heat exchange plate 3 and the first wall 20111 will be too small, resulting in poor heat exchange efficiency and low heat dissipation efficiency of the individual cell 201. If H1 is too small, the space for excess adhesive between the shell 2011 and the heat exchange plate 3 will be too small, resulting in poor bonding strength of the heat exchange plate 3.

[0024] Specifically, the height direction of the single cell 201 is as follows: Figure 2 As indicated by arrow H in the diagram. The first wall 20111 and the second wall 20112 of the casing 2011 are the walls containing the large surface area, which is prone to generating a large amount of heat and causing thermal expansion.

[0025] It should be noted that the adhesive layer 4 is filled between the bottom wall 20113 and the bottom plate 101. Due to the presence of the transition part 20114, the adhesive layer 4 will spread towards the transition part 20114, that is, overflow adhesive. This embodiment of the utility model expands the overflow adhesive space between the heat exchange plate 3 and the shell 2011, thereby improving the bonding firmness of the heat exchange plate 3.

[0026] For example, in the embodiments of this utility model, the value of H1 can be 1.5mm, 5mm, 10mm, 15mm, 20mm, 30mm, 35mm, etc.

[0027] In the embodiments of the utility model, the "battery pack" is formed by combining a certain number of individual batteries 201 in series and / or parallel to form a battery pack 2 and placing it in a housing 1 to protect the individual batteries 201 from external impacts, heat, vibration, etc. The housing 1 of the battery pack also includes a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components, sealed by a cover plate to form a complete functional unit that can directly output electrical energy. The battery pack, as a rechargeable battery unit, is the power source for new energy vehicles.

[0028] In the embodiments of the utility model, the "box 1" is a closed or semi-closed structure made of materials such as metal and plastic. Its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The box 1 provides installation space for the battery pack 2, BMS, thermal management system, electrical connection system, structural components, and protective components. Through reasonable structural design, these components are fixed inside the box 1 to ensure that they maintain a relatively stable position during battery pack operation and to avoid damage to components or loosening of connections due to vibration, impact, or other factors.

[0029] Specifically, the enclosure 1 generally consists of an upper enclosure and a lower enclosure. The lower enclosure includes a base plate 101 and side plates 102 connected to and surrounding the base plate 101. The base plate 101 is the main load-bearing component. The side plates 102 and the base plate 101 can be integrally formed or formed separately and fixedly connected. The upper enclosure is connected to the side plates 102 and has a cover plate opposite to the base plate 101. The upper and lower enclosures together form an installation space. The shape of the enclosure 1 can be cylindrical, cuboid, cube, etc.

[0030] Furthermore, this embodiment of the invention does not limit the material and shape of the base plate 101. The base plate 101 can be made of high-strength materials such as aluminum alloy, steel, and stainless steel. Additionally, the base plate 101 can be rectangular, circular, polygonal, or a plate-like structure. The dimensions of the base plate 101 are determined by the number of individual battery cells 201 contained in the battery pack and the dimensions of each individual battery cell 201.

[0031] In the embodiments of the utility model, "battery pack 2" refers to a power supply unit formed by combining multiple individual batteries 201 with equivalent capacity and internal resistance in series and / or parallel.

[0032] In the embodiments of this utility model, "single battery 201" refers to a battery capable of independent charging and discharging. The components of a single battery 201 may include a cell 2012 (including a positive electrode and a negative electrode), a separator, an electrolyte, and a casing 2011 for encapsulating the cell 2012, separator, and electrolyte. This utility model embodiment does not impose any particular limitation on the type or shape of the single battery 201; it can be a blade battery, a prismatic battery, or other types of batteries. The single battery 201 in this utility model embodiment can be a lithium-ion battery, a potassium-ion battery, a sodium-ion battery, a lithium-sulfur battery, etc., with lithium-ion batteries being particularly preferred.

[0033] In embodiments of this utility model, the "casing 2011" is a component used to provide a receiving space to house components such as the battery cell 2012, the separator, and the electrolyte, and to isolate them from the outside world. The casing 2011 generally includes a body with an opening at at least one end and a receiving cavity, and the opening of the casing 2011 can be closed by a cover plate assembly.

[0034] The shell 2011 is made of materials including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic film. The shell 2011 is generally made by stamping and forms an integrally formed first wall 20111, second wall 20112, transition part 20114, and bottom wall 20113.

[0035] In the embodiments of this utility model, the "cell 2012" is a component where an electrochemical reaction occurs, and is the smallest unit capable of performing electrochemical reactions such as charging / discharging. The cell 2012 includes a positive electrode, a negative electrode, and a separator. During battery charging and discharging, active ions repeatedly insert and extract between the positive and negative electrode. The electrolyte acts as a conductor of ions between the positive and negative electrode. For example, lithium-ion cells primarily rely on the insertion and extraction movement of lithium ions between the positive and negative electrode to function.

[0036] In an embodiment of the utility model, the heat exchange plate 3 is used to dissipate heat from the individual battery cell 201 to regulate its temperature. A heat exchange channel 303 can be provided within the heat exchange plate 3 to store refrigerant. Cooling of the individual battery cell 201 is achieved through the phase change of the refrigerant. The refrigerant can be a gas, solid, or liquid; for example, a liquid refrigerant can be water or other liquids with high specific heat capacity. The heat exchange plate 3 is vertically positioned between adjacent individual batteries 201. The bottom of the heat exchange plate 3 can be fixedly connected to the base plate 101, for example, by using nuts or other methods to fix the heat exchange plate 3 to the base plate 101.

[0037] Specifically, the heat exchange channel 303 can be U-shaped, U-shaped, or S-shaped. The heat exchange plate 3 may also include a liquid inlet and a liquid outlet for the input and output of refrigerant. The heat exchange plate 3 can be made of materials with certain hardness and strength, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, nylon, and plastic.

[0038] In one embodiment, 1mm ≤ H2 ≤ 32mm.

[0039] For example, in this embodiment of the present invention, the value of H2 can be 1mm, 4mm, 8mm, 12mm, 18mm, 25mm, 32mm, etc.

[0040] Furthermore, in one embodiment, 3mm≤H1≤20mm, 2mm≤H2≤18mm.

[0041] In one embodiment, 0.5mm ≤ H1-H2 ≤ 32mm. By controlling H1-H2 within a suitable range, the flatness of the bottom wall 20113 can be ensured while also improving the bonding strength of the heat exchange plate 3. If the value of H1-H2 is too large, the flatness of the bottom wall 20113 will be poor, and the structural strength of the shell 2011 will be low. If the value of H1-H2 is too small, the excess adhesive space between the shell 2011 and the heat exchange plate 3 will be small, the bonding strength of the heat exchange plate 3 will be weak, and the heat exchange plate 3 will easily detach from the shell 2011, resulting in low heat exchange efficiency of the heat exchange plate 3.

[0042] For example, in the embodiments of this utility model, the values ​​of H1-H2 can be 0.5mm, 1mm, 2mm, 5mm, 10mm, 15mm, 20mm, 25mm, 32mm, etc.

[0043] Furthermore, in one embodiment, 1mm ≤ H1 - H2 ≤ 15mm.

[0044] It should be noted that the shape of the transition portion 20114 is not limited in this embodiment of the utility model, as long as the transition portion 20114 can provide sufficient space for overflow adhesive between the heat exchange plate 3 and the housing 2011.

[0045] In one embodiment, such as Figure 4 As shown, the transition section 20114 includes a first fillet 20115 and a second fillet 20116. The first fillet 20115 is located between the first wall 20111 and the bottom wall 20113, and the second fillet 20116 is located between the second wall 20112 and the bottom wall 20113. The radius of the first fillet 20115 is R1, and the radius of the second fillet 20116 is R2, satisfying R1 > R2.

[0046] A first fillet 20115 is provided between the first wall 20111 and the bottom wall 20113, and a second fillet 20116 is provided between the second wall 20112 and the bottom wall 20113. The radius of the first fillet 20115 is controlled to be larger than that of the second fillet 20116, so that sufficient overflow space can be left between the bottom of the first wall 20111 and the heat exchange plate 3, thereby improving the bonding strength between the shell 2011 and the heat exchange plate 3.

[0047] Specifically, after the shell 2011 is stamped, a transition rounded corner is generally formed at the corner. In this embodiment of the utility model, it is only necessary to stamp a larger first rounded corner 20115 at the end of the first wall 20111 of the shell 2011 near the bottom wall 20113 to improve the bonding strength between the shell 2011 and the heat exchange plate 3. The processing is simple and the manufacturing cost is low.

[0048] Furthermore, in one embodiment, 1.5mm ≤ R1 ≤ 3.5mm. By controlling the radius of the first fillet 20115 within a suitable range, that is, indirectly controlling H1 within a suitable range, sufficient space for the adhesive layer 4 can be left between the first fillet 20115, the base plate 101, and the heat exchange plate 3. This expands the effective bonding area of ​​the adhesive layer 4 on the heat exchange plate 3, thereby improving the bonding strength of the heat exchange plate 3, reducing the risk of the heat exchange plate 3 falling off, and effectively ensuring the heat exchange effect of the heat exchange plate 3. If R1 is too large, the effective heat exchange area between the heat exchange plate 3 and the first wall 20111 is small, resulting in poor heat exchange efficiency. If R1 is too small, the amount of adhesive layer 4 between the shell 2011 and the heat exchange plate 3 is too small, the bonding strength between the shell 2011 and the heat exchange plate 3 is poor, and the heat exchange plate 3 is easy to detach after the shell undergoes thermal expansion, resulting in poor heat exchange effect.

[0049] For example, in this embodiment of the present invention, the value of R1 can be 1.5mm, 2.5mm, 3.5mm, etc.

[0050] Furthermore, in one embodiment, 0.5mm ≤ R2 ≤ 1.5mm.

[0051] For example, in this embodiment of the present invention, the value of R2 can be 0.5mm, 1mm, 1.5mm, etc.

[0052] Furthermore, in one embodiment, 0.5mm ≤ R1-R2 ≤ 3mm. By controlling R1-R2 within a suitable range, that is, indirectly controlling H1-H2 within a suitable range, the heat exchange effect and bonding strength of the heat exchange plate 3 can be guaranteed. If the value of R1-R2 is too large, the effective heat exchange area between the heat exchange plate 3 and the first wall 20111 is too small, resulting in poor heat exchange efficiency. If the value of R1-R2 is too small, the excess adhesive space between the shell 2011 and the heat exchange plate 3 is small, the bonding strength between the first wall 20111 and the heat exchange plate 3 is weak, and the heat exchange plate 3 is prone to detaching from the shell 2011, resulting in low heat exchange efficiency of the heat exchange plate 3.

[0053] For example, in this embodiment of the present invention, the values ​​of R1-R2 can be 0.5mm, 1mm, 2mm, 3mm, etc.

[0054] In one embodiment, such as Figure 5 As shown, the transition portion 20114 includes a recessed portion 20117 that is recessed towards the interior of the housing 2011. The recessed portion 20117 is located between the first wall 20111 and the bottom wall 20113. Providing the recessed portion 20117 between the first wall 20111 and the bottom wall 20113 ensures that H1 is greater than H2, thereby improving the bonding strength between the heat exchange plate 3 and the housing 2011 and increasing the heat exchange efficiency of the heat exchange plate 3.

[0055] Specifically, the shape of the recess 20117 can be selected as a regular or irregular shape as needed. Regular shapes include inclined surfaces or multi-segment curved surfaces. In addition, a transition fillet can be provided between the second wall 20112 and the bottom wall 20113.

[0056] Furthermore, in one embodiment, such as Figure 5 As shown, along the thickness direction of the single cell 201, the width of the recess 20117 is W1, and the thickness of the single cell 201 is W2, satisfying 0.037≤W1 / W2≤7. By controlling W1 / W2 within a suitable range, the bonding strength between the heat exchange plate 3 and the shell 2011 can be improved while ensuring the flatness of the bottom wall 20113. If the value of W1 / W2 is too large, the flatness of the bottom wall 20113 will be poor; if the value of W1 / W2 is too small, the bonding strength between the shell 2011 and the heat exchange plate 3 will be low.

[0057] Specifically, the thickness direction of the single cell 201 is as follows: Figure 2 As indicated by the arrow W in the diagram.

[0058] For example, in the embodiments of this utility model, W1 / W2 can be 0.037, 0.1, 1, 2, 3, 4, 5, 6, 7, etc.

[0059] Furthermore, in one embodiment, 3mm ≤ W1 ≤ 70mm. By controlling the width W1 of the recess 20117 within a suitable range, the bonding strength between the bottom wall 20113 and the heat exchange plate 3 can be further ensured, while also guaranteeing the flatness of the bottom wall 20113. If W1 is too large, the flatness of the bottom wall 20113 will be poor; if W1 is too small, the bonding strength between the shell 2011 and the heat exchange plate 3 will be low.

[0060] For example, in this embodiment of the present invention, W1 can be 3mm, 5mm, 10mm, 20mm, 40mm, 60mm, 70mm, etc.

[0061] Furthermore, in one embodiment, 10mm ≤ W2 ≤ 80mm.

[0062] For example, in this embodiment of the present invention, W2 can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, etc.

[0063] In one embodiment, such as Figure 3 As shown, the heat exchange plate 3 includes a vertical plate 301 and a horizontal plate 302 connected to each other. The vertical plate 301 is located on top of the horizontal plate 302. The opposite sides of the vertical plate 301 face the first wall 20111 of the two adjacent shells 2011 respectively. The bottom of the horizontal plate 302 is at least partially overlapped with the bottom plate 101.

[0064] Specifically, both the vertical plate 301 and the horizontal plate 302 of the heat exchange plate 3 are provided with heat exchange channels 303 to improve the heat exchange effect. The vertical plate 301 is used for heat exchange with the first wall 20111, and the horizontal plate 302 is used for fixed connection with the base plate 101 and for fixing the vertical plate 301. The vertical plate 301 can be integrally formed with the horizontal plate 302, and the bottom of the vertical plate 301 is connected to the middle of the top of the horizontal plate 302. The vertical plate 301 can cover the first wall 20111 to further improve the heat exchange effect.

[0065] Furthermore, in one embodiment, such as Figure 2 and Figure 3 As shown, the two opposite ends of the horizontal plate 302 extend between the bottom walls 20113 and the bottom plate 101 of two adjacent shells 2011, and the extension length is L1, which satisfies 2mm≤L1≤80mm. Extending the horizontal plate 302 between the bottom walls 20113 and the bottom plate 101 and controlling L1 within a suitable range can also increase the effective bonding area between the heat exchange plate 3 and the shell 2011, thereby improving the bonding strength of the heat exchange plate 3.

[0066] For example, in this embodiment of the present invention, L1 can be 2mm, 5mm, 10mm, 20mm, 40mm, 60mm, 80mm, etc.

[0067] Furthermore, in one embodiment, such as Figure 3 As shown, the top of the horizontal plate 302 is bonded and fixed to the bottom wall 20113 of the housing 2011 by the adhesive layer 4. The adhesive layer 4 can overflow to the area between the housing 2011, the heat exchange plate 3 and the bottom plate 101 to further improve the bonding strength of the heat exchange plate 3.

[0068] Furthermore, in one embodiment, the projection of the heat exchange channel 303 in the vertical direction at least partially overlaps with the projection of the transition portion 20114 near the first wall 20111 in the vertical direction. Since the bottom of the first wall 20111 is raised, the heat exchange effect at this location is poor. By ensuring that the projection of the heat exchange channel 303 in the vertical direction at least partially overlaps with the projection of the transition portion 20114 near the first wall 20111 in the vertical direction, the heat exchange channel 303 can effectively exchange heat with the bottom of the first wall 20111, further improving the heat exchange efficiency of the heat exchange plate 3.

[0069] In one embodiment, multiple heat exchange plates 3 are provided, and the housing 1 is also provided with side plates 102 surrounding the bottom plate 101. The heat exchange plates 3 are also provided between the side plates 102 and the individual cells 201 near the side plates 102. By providing the heat exchange plates 3 between the side plates 102 and the individual cells 201 near the side plates 102, the heat exchange effect can be further improved.

[0070] In one embodiment, multiple heat exchange plates 3 are provided, and the battery pack 2 includes multiple pairs of individual cells 201. The heat exchange plates 3 are disposed between the pairs of individual cells 201. The first wall 20111 of each pair of individual cells 201 faces the heat exchange plate 3, and the second wall 20112 of each pair of individual cells 201 faces each other. The two sides of the heat exchange plate 3 can dissipate heat to the two first walls 20111 respectively, thereby improving the heat dissipation efficiency and ensuring the bonding strength between the housing 2011 and the heat exchange plate 3. It can also save the amount of heat exchange plates 3 used and reduce the cost of use.

[0071] According to an embodiment of the present invention, another aspect provides an electrical device, including a battery pack.

[0072] Since the electrical device includes a battery pack and has the same effect as the battery pack, it will not be described in detail here.

[0073] In this embodiment of the utility model, the electrical equipment includes, but is not limited to, vehicles, mobile phones, portable devices, spacecraft, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0074] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized by, include: The box body (1) is provided with a bottom plate (101); At least one battery pack (2) is disposed within the housing (1). The battery pack (2) includes a plurality of individual cells (201). Each individual cell (201) includes a housing (2011) and a cell (2012) disposed within the housing (2011). The housing (2011) has a first wall (20111) and a second wall (20112) perpendicular to the base plate (101) in the height direction. The housing (2011) has a bottom wall (20113) on the side facing the base plate (101). The bottom wall (20113) is disposed on the base plate (101) by an adhesive layer (4). The first wall (20111) The first wall (20111) and the second wall (20112) are respectively provided with transition portions (20114) at one end near the bottom wall (20113), and are connected to the opposite ends of the bottom wall (20113) through the transition portions (20114); along the height direction of the single cell (201), the distance between the end of the first wall (20111) near the bottom wall (20113) and the top surface of the bottom plate (101) is H1, and the distance between the end of the second wall (20112) near the bottom wall (20113) and the top surface of the bottom plate (101) is H2, satisfying H1>H2, 1.5mm≤H1≤35mm; At least one heat exchange plate (3) is disposed between at least two adjacent single cells (201) of the battery pack (2), with the plate surface of the heat exchange plate (3) facing the first wall (20111) of the housing (2011).

2. The battery pack of claim 1, wherein, 1mm≤H2≤32mm.

3. The battery pack of claim 2, wherein, 3mm≤H1≤20mm, 2mm≤H2≤18mm.

4. The battery pack of claim 1, wherein, 0.5mm≤H1-H2≤32mm.

5. The battery pack of claim 4, wherein, 1mm≤H1-H2≤15mm.

6. The battery pack according to claim 1, characterized in that, The transition section (20114) includes a first fillet (20115) and a second fillet (20116). The first fillet (20115) is located between the first wall (20111) and the bottom wall (20113), and the second fillet (20116) is located between the second wall (20112) and the bottom wall (20113). The radius of the first fillet (20115) is R1, and the radius of the second fillet (20116) is R2, satisfying R1 > R2.

7. The battery pack of claim 6, wherein, 1.5mm≤R1≤3.5mm.

8. The battery pack of claim 6, wherein, 0.5mm≤R2≤1.5mm.

9. The battery pack of claim 6, wherein, 0.5mm≤R1-R2≤3mm.

10. The battery pack of claim 1, wherein, The transition portion (20114) includes a recess (20117) that is recessed toward the interior of the housing (2011), the recess (20117) being disposed between the first wall (20111) and the bottom wall (20113).

11. The battery pack of claim 10, wherein, Along the thickness direction of the single cell (201), the width of the recess (20117) is W1, and the thickness of the single cell (201) is W2, satisfying 0.037≤W1 / W2≤7.

12. The battery pack of claim 11, wherein, 3mm≤W1≤70mm.

13. The battery pack according to claim 11, characterized in that, 10mm≤W2≤80mm.

14. The battery pack of any one of claims 1-13, wherein, The heat exchange plate (3) includes a vertical plate (301) and a horizontal plate (302) connected to each other. The vertical plate (301) is located on top of the horizontal plate (302). The opposite sides of the vertical plate (301) face the first wall (20111) of the two adjacent shells (2011). The bottom of the horizontal plate (302) is at least partially overlapped with the bottom plate (101).

15. The battery pack of claim 14, wherein, The two ends of the horizontal plate (302) extend to the space between the bottom wall (20113) and the bottom plate (101) of the two adjacent shells (2011), and the extension length is L1, which satisfies 2mm≤L1≤80mm.

16. The battery pack according to claim 15, characterized in that, The top of the horizontal plate (302) is bonded and fixed to the bottom wall (20113) of the housing (2011) by the adhesive layer (4).

17. The battery pack of claim 14, wherein, The horizontal plate (302) is provided with a heat exchange channel (303), and the projection of the heat exchange channel (303) in the vertical direction at least partially overlaps with the projection of the transition part (20114) near the first wall (20111) in the vertical direction.

18. The battery pack of any one of claims 1-13, wherein, Multiple heat exchange plates (3) are provided, and the housing (1) is also provided with side plates (102) surrounding the bottom plate (101). The heat exchange plates (3) are also provided between the side plates (102) and the single cell (201) near the side plates (102).

19. The battery pack of any one of claims 1-13, wherein, Multiple heat exchange plates (3) are provided, and the battery pack (2) includes multiple pairs of individual cells (201). The heat exchange plates (3) are provided between the pairs of individual cells (201). The first wall (20111) of each pair of individual cells (201) faces the heat exchange plate (3), and the second wall (20112) of each pair of individual cells (201) is arranged opposite to each other.

20. An electrical device, comprising: include: The battery pack according to any one of claims 1 to 19.

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