Battery pack and electric device with same

Abstract

The utility model relates to battery pack and electric equipment with it. Battery pack includes box, a plurality of batteries, a plurality of first cold plate, fixed plate and fixed structure. The box is equipped with top cover and box wall, and the top cover and box wall enclose the containing space. A plurality of batteries are stacked along the first direction and are contained in the containing space. A plurality of first cold plates are located at the top of a plurality of batteries, and each first cold plate extends along the first direction and a plurality of first cold plates are spaced along the second direction, and the first direction, the second direction and the up-down direction are perpendicular to each other. The fixed plate extends across a plurality of first cold plates along the second direction and is in heat conduction connection with a plurality of first cold plates to limit the upward displacement of a plurality of first cold plates. The fixed structure is fixedly connected with the box and the fixed plate. By restricting the displacement of the first cold plate, the contact area between the first cold plate and the battery and the heat exchange efficiency can be ensured, and in addition, the heat conduction connection of the fixed plate and a plurality of first cold plates can also realize the temperature consistency between a plurality of first cold plates.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular, to a battery pack and an electrical device having the same. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage systems, and other fields, batteries have gained widespread application due to their advantages such as high energy density and long cycle life. To ensure that batteries always operate within a suitable temperature range, battery packs are usually equipped with cooling plates for heat exchange with the batteries.

[0003] In related technologies, battery packs include multiple cold plates that are thermally connected to the batteries. However, in actual operation, battery packs often face various complex conditions such as vibration and impact. When cold plates are subjected to external forces in the vertical direction, they are prone to displacement or deformation, thus affecting their contact with the batteries. Specifically, when a cold plate bends and deforms under external forces, its contact area with the battery decreases, creating a localized air insulation layer between the cold plate and the battery. Since air has a low thermal conductivity, this hinders the heat exchange efficiency of the cold plate. Furthermore, when using multiple cold plates for heat exchange, it is often difficult to ensure temperature uniformity among the cold plates, easily leading to uneven cooling within the battery pack, further affecting the uniformity and reliability of overall thermal management. Utility Model Content

[0004] In view of this, the present invention provides a battery pack and an electrical device having the same, which aims to ensure the installation stability and temperature consistency of multiple cold plates.

[0005] In a first aspect, the battery pack provided by this utility model includes a housing, multiple batteries, multiple first cold plates, a fixing plate, and a fixing structure. The housing has a top cover and housing walls, which enclose an accommodating space. Multiple batteries are stacked along a first direction and accommodated in the accommodating space. Multiple first cold plates are located on top of the multiple batteries, each first cold plate extending along the first direction and the multiple first cold plates being spaced apart along a second direction, with the first direction, second direction, and vertical direction being perpendicular to each other. The fixing plate extends along the second direction across the multiple first cold plates and is thermally connected to the multiple first cold plates to restrict the upward displacement of the multiple first cold plates. The fixing structure fixes the housing and the fixing plate.

[0006] Secondly, the electrical equipment provided by this utility model includes the battery pack of the first aspect.

[0007] The beneficial effects of the battery pack provided by this utility model are as follows: The connection between the fixed plate and multiple first cold plates enhances the overall stability of the first cold plates, constrains their upward displacement, and ensures a stable contact area between the first cold plates and the battery under adverse conditions such as impact or vibration, thus guaranteeing unaffected heat exchange efficiency. This allows heat generated during battery charging and discharging to be dissipated promptly, helping to avoid the risk of thermal runaway caused by localized overheating. Furthermore, the thermally conductive connection between the fixed plate and the multiple first cold plates establishes an effective heat conduction path among them. When the temperature of one first cold plate is too high, heat can be conducted through the fixed plate to the cooler first cold plate, achieving heat balance among the multiple first cold plates. This method ensures temperature consistency among the multiple first cold plates, improving the uniformity of heat exchange and the reliability of thermal management of the entire battery pack. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0009] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0010] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0011] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0012] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present invention.

[0013] Figure 2 yes Figure 1 An exploded view of the battery pack.

[0014] Figure 3 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0015] Figure 4 yes Figure 1 A schematic diagram of the battery structure in the battery pack.

[0016] Figure 5 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0017] Figure 6 yes Figure 5 A schematic diagram of the support structure.

[0018] Figure 7 yes Figure 1A cross-sectional view of a portion of the battery pack.

[0019] Figure 8 yes Figure 1 A cross-sectional view of the battery pack.

[0020] Figure 9 This is a cross-sectional view of a portion of a battery pack according to a first variation of the present invention.

[0021] Figure 10 This is a cross-sectional view of a portion of a battery pack according to a second variation of the present invention.

[0022] Figure 11 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0023] Explanation of reference numerals in the attached drawings: Battery pack - 100; Box body - 10; Top cover - 11; Box wall - 12; Accommodation space - 13; Bottom beam - 14; Battery - 20; Shell - 21; Cell - 22; Terminal post - 23; Explosion-proof valve - 24; Battery group - 201; First cold plate - 31; Second cold plate - 32; Fixing plate - 40; Body part - 41; Protrusion - 42; Top plate - 43; Side plate - 44; Fixing structure - 50; Support plate - 51; Support - 52; First plate part - 521; Second plate part - 522; Third plate part - 523; Fourth plate part - 524; Fifth plate part - 525; End plate - 60; Electrical equipment - 200. Detailed Implementation

[0024] The embodiments of the present invention will now be described by way of example with reference to the accompanying drawings. It should be understood that there are many ways to implement the present invention, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of the present invention.

[0025] <Example Battery> Figure 4 A battery 20 is shown, which can store chemical energy and controllably convert chemical energy into electrical energy. In the recyclable battery 20, the active materials can be activated by charging after discharge so that it can continue to be used.

[0026] It is understood that in this embodiment of the present invention, battery 20 refers to an energy storage device that can be repeatedly charged and discharged. Battery 20 can be lithium-ion battery 20, sodium-ion battery 20, nickel-metal hydride battery 20, etc.

[0027] refer to Figure 4 The battery 20 includes a casing 21, a cell 22, and terminals 23.

[0028] The housing 21 provides a receiving space to house the battery cell 22 and isolate it from the outside environment. The housing 21 includes a body with an opening at at least one end and a receiving cavity. The opening of the housing 21 can be closed by a cover plate, sealing and isolating the internal environment of the battery 20 from the external environment. Exemplarily, the material of the housing 21 can be one of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic film; this invention does not impose any particular limitation on this.

[0029] Cell 22 is the component in battery 20 where electrochemical reactions occur, and it is also the smallest unit in battery 20 capable of electrochemical reactions such as charging or discharging. Cell 22 typically includes a positive electrode, a negative electrode, and a separator. As an example, cell 22 can be a lithium-ion cell 22, which operates by the intercalation and deintercalation of lithium ions between the positive and negative electrodes.

[0030] It is understood that the battery cell 22 can be implemented in various ways. For example, the battery cell 22 can be a cylindrical battery cell 22 formed by winding a positive electrode sheet, a separator, and a negative electrode sheet. Alternatively, the battery cell 22 can be a battery cell 22 with a generally cuboid shape formed by winding or stacking a positive electrode sheet, a separator, and a negative electrode sheet. In the current embodiment, the battery cell 22 is cuboid in shape, and the housing 21 is a cuboid-shaped rigid shell to accommodate the battery cell 22.

[0031] The terminals 23 are used to connect to the cell 22 to output or input electrical energy into the battery 20. In the current embodiment, the battery 20 includes two terminals 23, which are respectively connected to the positive and negative terminals of the cell 22.

[0032] Continue to refer to Figure 4 The battery 20 also includes an explosion-proof valve 24, which is actuated when the internal pressure or temperature of the housing 21 reaches a predetermined threshold to release the internal pressure or temperature, so as to reduce the internal pressure of the housing 21 and prevent the battery 20 from deforming or exploding due to excessive pressure increase inside the housing 21.

[0033] It is understood that the present invention does not impose any particular restrictions on the position of the explosion-proof valve 24. For example, the explosion-proof valve 24 can be located at the top of the battery 20 or at the bottom of the battery 20.

[0034] It is understood that this utility model does not impose any special restrictions on the material of the explosion-proof valve 24. For example, the explosion-proof valve 24 can be made of aluminum, steel, or an alloy.

[0035] It is understood that the present invention does not impose any particular restrictions on the shape of the explosion-proof valve 24. For example, the shape of the explosion-proof valve 24 can be one of square, oblong, elliptical and racetrack shape.

[0036] It is understood that this utility model does not impose any particular limitation on the type of explosion-proof valve 24. For example, the explosion-proof valve 24 can be a weak area formed on the wall by laser processing or stamping, and the weak area has a smaller material thickness than the wall. When the internal pressure of the battery 20 exceeds a preset safety threshold, the weak area will rupture first, thereby releasing the internal pressure of the housing 21.

[0037] <Example Battery Pack> refer to Figure 1 and Figure 2 The battery pack 100 provided in this embodiment of the present invention includes a housing 10 and a plurality of batteries 20. The housing 10 is provided with a top cover 11 and a housing wall 12, which together form an accommodating space 13. The accommodating space 13 accommodates the plurality of batteries 20.

[0038] The battery pack 100 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 (casing, brackets, etc.), and protective components. The above components and the battery pack are placed inside the housing 10 and sealed by a cover plate to form a complete functional unit that can directly output electrical energy.

[0039] Battery 20 faces different performance and safety challenges under different temperature environments. For example, at low temperatures, the electrochemical reaction rate inside battery 20 decreases significantly, which can easily lead to capacity decay, increased internal resistance, and decreased power output, and in severe cases, even failure to function properly. At high temperatures or during intense charging and discharging, battery 20 generates a large amount of heat. If heat dissipation is not timely or uneven, it may cause local overheating, resulting in safety hazards such as thermal runaway.

[0040] To ensure that the operating temperature of battery 20 is maintained within a suitable range, refer to Figure 2 The battery pack 100 also includes a cooling plate 30, which is used to dissipate heat from the battery 20 to regulate the temperature of the battery 20.

[0041] As one possible implementation, the cold plate 30 can be constructed as a liquid-cooled plate 30 or a phase-change cold plate 30, and is thermally connected to the battery 20. A refrigerant can be stored within the cold plate 30, and cooling of the battery 20 is achieved through a phase change of the refrigerant.

[0042] It is understandable that the refrigerant can be gas, solid, or liquid. Liquid refrigerants can also contain liquids with high specific heat capacity, such as water, as coolants to achieve liquid cooling of the battery 20.

[0043] As an example, the cooling plate 30 can be an air-cooled plate 30, located at the bottom of the housing 10, i.e., connected to the bottom of the side wall to form a sealed housing 10 structure. The air-cooled plate 30 can be fixed to the side wall of the housing 10 using nuts or other methods. In order to form an airflow cavity inside the housing 10, the bottom plate is set inside the barrel-shaped structure. Since the bottom of the battery 20 is flat, the bottom plate also needs to be set parallel to the air-cooled plate 30, with a gap between the air-cooled plate 30 and the bottom plate, so that the bottom plate, side wall, and air-cooled plate 30 together form an airflow cavity.

[0044] As another example, the cooling plate 30 can be a liquid-cooled plate 30, which has liquid cooling channels within it. Optionally, the liquid-cooled plate 30 also includes a liquid inlet and a liquid outlet, both of which are connected to the current collector for the inlet and outlet of the heat exchange medium. The liquid-cooled plate 30 can be made of a material with a certain hardness and strength (such as stainless steel), so that the liquid-cooled plate 30 is not easily deformed when the battery 20 is subjected to compression or impact, which can enable the battery 20 to have higher structural strength and improve safety performance.

[0045] It is understandable that the shape of the liquid cooling channel can be various, such as "U", "U-shaped", or "S" shaped. It is understandable that the liquid cooling plate 30 can be made of various materials, such as copper, iron, aluminum, stainless steel, or aluminum alloy. The liquid cooling plate 30 can also be made of nylon, plastic, etc.

[0046] When the cold plate 30 is subjected to external force in the vertical direction, it will bend and deform. This will reduce the contact area between the cold plate 30 and the battery 20, resulting in the presence of a heat transfer medium with a low thermal conductivity, namely air, between the cold plate 30 and the battery 20, thereby reducing the heat exchange efficiency of the cold plate 30.

[0047] To solve the above problems, refer to Figures 2 to 5 The battery pack 100 provided by this utility model includes a plurality of first cold plates 31, a fixing plate 40, and a fixing structure 50. A plurality of batteries 20 are stacked along a first direction and housed in a housing space 13. The plurality of first cold plates 31 are located on top of the plurality of batteries 20, each first cold plate 31 extending along the first direction and the plurality of first cold plates 31 being spaced apart along a second direction. The fixing plate 40 extends along the second direction across the plurality of first cold plates 31 and is thermally connected to the plurality of first cold plates 31 to restrict upward displacement of the plurality of first cold plates 31. The fixing structure 50 fixes the housing 10 and the fixing plate 40.

[0048] The fixed plate 40 is connected to multiple first cold plates 31, which enhances the overall stability of the first cold plates 31, constrains the upward displacement of the first cold plates 31, and ensures that a stable contact area is maintained between the first cold plates 31 and the battery 20 under adverse conditions such as impact or vibration, thereby ensuring that the heat exchange efficiency is not affected. In this way, the heat generated by the battery 20 during charging and discharging can be dissipated in a timely manner, helping to avoid the risk of thermal runaway caused by local overheating. Furthermore, the thermally conductive connection between the fixed plate 40 and the multiple first cold plates 31 can also establish an effective heat conduction path among the multiple first cold plates 31. When the temperature of a certain first cold plate 31 is too high, the heat can be conducted to the first cold plate 31 with a lower temperature through the fixed plate 40, thereby achieving heat balance among the multiple first cold plates 31. This method can improve the temperature consistency among the multiple first cold plates 31, improve the uniformity of heat exchange and the reliability of thermal management of the battery pack 100.

[0049] It should be noted that the thermally conductive connection mentioned above can refer to the direct contact between two objects to complete heat transfer, or it can be completed through a material with good thermal conductivity located between the two objects.

[0050] It should be noted that in the accompanying drawings of this utility model, arrows Z+ and Z- can be used to indicate opposite sides in the up and down direction, and the up and down direction is perpendicular to the bottom plate of the box 10; arrows X+ and X- can be used to indicate opposite sides in the first direction; arrows Y+ and Y- can be used to indicate opposite sides in the second direction, and the first direction, the second direction and the up and down direction are perpendicular to each other.

[0051] It should be noted that the top of battery 20 refers to the side of battery 20 away from the bottom plate of the casing 10, which is also the surface on which the terminal posts 23 of battery 20 are arranged.

[0052] refer to Figure 2 and Figure 7 The fixing plate 40 is pressed against the side of the plurality of first cold plates 31 away from the plurality of batteries 20. This implementation facilitates installation and improves assembly efficiency. In addition, the plurality of first cold plates 31 can also provide stable support for the fixing plate 40, which is beneficial to the installation stability of the fixing plate 40.

[0053] Further, refer to Figure 2 The fixing plate 40 is fixedly connected to multiple first cold plates 31. In this way, the fixing plate 40 can also constrain the displacement of multiple first cold plates 31 in the second direction, further enhancing the overall stability of multiple first cold plates 31, ensuring that the first cold plates 31 and the battery 20 can still maintain a stable contact area under adverse working conditions such as impact or vibration, thereby ensuring that the heat exchange efficiency is not affected.

[0054] It is understood that there are many ways to achieve the fixed connection between the fixed plate 40 and the multiple first cold plates 31, and this utility model does not impose any particular limitation on this. For example, the fixed plate 40 and the multiple first cold plates 31 can be connected by welding.

[0055] refer to Figure 7 The thickness of the fixing plate 40 is H11 mm, and the thickness of each of the plurality of first cold plates 31 is H21 mm, where 1 / 10 ≤ H11 mm / H21 mm ≤ 25 / 12. For example, H11 mm / H21 mm can be 1 / 10, 1 / 6, 1 / 4, 1 / 3, 1 / 2, 2 / 3, 3 / 4, 1, 6 / 5, 5 / 4, 4 / 3, 3 / 2, 2, or 25 / 12.

[0056] If the ratio of the thickness of the fixed plate 40 to the thickness of the first cold plate 31 is small, i.e., less than 1 / 10, then the thickness of the fixed plate 40 is small. This reduces the connection strength between the fixed plate 40 and the multiple first cold plates 31. Therefore, under adverse conditions such as impact or vibration, the connection between the first cold plate 31 and the battery 20 is easily damaged, resulting in the failure of the constraint on the first cold plate 31. If the ratio of the thickness of the fixed plate 40 to the thickness of the first cold plate 31 is large, i.e., greater than 25 / 12, then the thickness of the first cold plate 31 is small. This results in a smaller flow rate of the heat exchange medium, leading to a poorer heat exchange effect of the first cold plate 31.

[0057] According to the battery pack 100 provided by this utility model, the ratio of the thickness of the fixing plate 40 to the thickness of the first cold plate 31 is limited to the above-mentioned numerical range, which can ensure both the connection stability between the fixing plate 40 and the multiple first cold plates 31 and the heat exchange effect of the first cold plates 31.

[0058] As one possible implementation, the thickness of the fixing plate 40 is H11 mm, where 1 mm ≤ H11 mm ≤ 10 mm. For example, H11 mm can be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm.

[0059] If the thickness of the fixing plate 40 is small, i.e., less than 1 mm, this will reduce the connection strength between the fixing plate 40 and the multiple first cold plates 31. Therefore, under adverse working conditions such as impact or vibration, the connection between the first cold plates 31 and the battery 20 is easily damaged, resulting in the failure of the constraint on the first cold plates 31. If the thickness of the fixing plate 40 is large, i.e., greater than 10 mm, this will increase the dimension of the fixing plate 40 in the vertical direction, which is detrimental to the space utilization efficiency and structural compactness of the battery pack 100.

[0060] According to the battery pack 100 provided by this utility model, the thickness of the fixing plate 40 is limited to the above-mentioned numerical range, which can ensure the connection stability between the fixing plate 40 and the multiple first cold plates 31, and also ensure the space utilization efficiency and structural compactness of the battery pack 100.

[0061] As one possible implementation, the thickness of the first cold plate 31 is H21 mm, where 4.8 mm ≤ H21 mm ≤ 10 mm. For example, H21 mm can be 4.8 mm, 5 mm, 5.2 mm, 5.5 mm, 5.8 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm.

[0062] If the thickness of the first cold plate 31 is small, i.e. less than 4.8 mm, this will result in a small flow rate of the heat exchange medium, thus leading to a poor heat exchange effect of the first cold plate 31. If the thickness of the first cold plate 31 is large, i.e. greater than 10 mm, this will increase the size of the first cold plate 31 in the vertical direction, which is not conducive to the space utilization efficiency and structural compactness of the battery pack 100.

[0063] According to the battery pack 100 provided by this utility model, the thickness of the first cold plate 31 is limited to the above-mentioned numerical range, which can ensure the connection stability between the fixing plate 40 and the multiple first cold plates 31, and also ensure the space utilization efficiency and structural compactness of the battery pack 100.

[0064] refer to Figure 2 and Figure 5 The housing 10 includes a bottom beam 14 extending along a second direction, which divides the housing space 13 of the housing 10 into two compartments. Multiple batteries 20 form two battery packs 201, each housed in one of the two compartments. A fixing structure 50 is located on the bottom beam 14 and is fixedly connected to the bottom beam 14 and the fixing plate 40. Because the fixing structure 50 is located on the bottom beam 14, the space occupied by the fixing structure 50 in the first direction overlaps with the space occupied by the bottom beam 14 in the first direction. This helps to reduce the dimensions of the fixing structure 50 and the bottom beam 14 in the first direction, improving the space utilization efficiency and structural compactness of the battery pack 100.

[0065] refer to Figure 3 Each battery 20 has a terminal post 23 on its top, and the fixing plate 40 does not cover the terminal post 23. This implementation prevents the fixing plate 40 from directly contacting the terminal post 23, thus avoiding electrical risks caused by short circuits due to contact, thereby improving the electrical safety of the battery pack 100.

[0066] Continue to refer to Figure 3In the first direction, the minimum distance between the fixing plate 40 and the pole post 23 is D1 mm, where 8 mm ≤ D1 mm ≤ 50 mm. For example, D1 mm can be 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm.

[0067] If the minimum distance between the fixing plate 40 and the pole post 23 is too small, i.e. less than 8 mm, the fixing plate 40 and the pole post 23 are prone to accidental contact during installation or under adverse working conditions such as impact or vibration, which may lead to insulation failure and short circuit.

[0068] If the minimum distance between the fixing plate 40 and the pole post 23 is too large, i.e. greater than 50 mm, the size of the fixing plate 40 in the first direction is small, which is not conducive to the connection strength between the fixing plate 40 and the first cold plate 31.

[0069] According to the battery pack 100 provided by this utility model, the minimum distance between the fixing plate 40 and the terminal post 23 is limited to the above-mentioned numerical range, which can reduce the risk of insulation failure and short circuit, and ensure the connection strength between the fixing plate 40 and the first cold plate 31.

[0070] Continue to refer to Figure 3 There are two terminals 23, and the explosion-proof valve 24 is located between the two terminals 23 in the second direction. The fixing plate 40 does not cover the explosion-proof valve 24. In this way, the fixing plate 40 can exchange heat with the battery 20, and the fixing plate 40 can also avoid blocking the explosion-proof valve 24, thereby ensuring the safety of the battery 20.

[0071] Continue to refer to Figure 3 In the first direction, the minimum distance from the fixing plate 40 to the explosion-proof valve 24 is D2 mm, where 4.25 mm ≤ D2 mm ≤ 46.25 mm. For example, D2 mm can be 4.25 mm, 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 43 mm, 45 mm, or 46.25 mm.

[0072] If the minimum distance between the fixing plate 40 and the explosion-proof valve 24 is too small, i.e., less than 4.25 mm, the fixing plate 40 is easily affected by the actuation impact of the explosion-proof valve 24, thus affecting the reliability of its connection with the first cold plate 31. If the minimum distance between the fixing plate 40 and the explosion-proof valve 24 is too large, i.e., greater than 46.25 mm, the dimension of the fixing plate 40 in the first direction is too small, which is not conducive to the connection strength between the fixing plate 40 and the first cold plate 31.

[0073] According to the battery pack 100 provided by this utility model, the minimum distance between the fixing plate 40 and the explosion-proof valve 24 is limited to the above-mentioned numerical range, which can reduce the impact of the actuation of the explosion-proof valve 24 on the stability of the fixing plate 40, and ensure the connection strength between the fixing plate 40 and the first cold plate 31.

[0074] Continue to refer to Figure 3 In the first direction, the size of the fixed plate 40 is D3 mm, the size of the bottom beam 14 is D4 mm, and 7 / 45 ≤ D3 mm / D4 mm ≤ 9 / 2. For example, D3 mm / D4 mm can be 7 / 45, 1 / 4, 1 / 3, 1 / 2, 3 / 5, 3 / 4, 1, 5 / 4, 3 / 2, 2, 5 / 2, 3, 7 / 2, 4, or 9 / 2.

[0075] If the ratio of the dimension of the fixing plate 40 along the first direction to the dimension of the bottom beam 14 along the first direction is too small, i.e., less than 7 / 45, then the dimension of the fixing plate 40 along the first direction is small, which is detrimental to the connection strength between the fixing plate 40 and the first cold plate 31. If the ratio of the dimension of the fixing plate 40 along the first direction to the dimension of the bottom beam 14 along the first direction is too large, i.e., greater than 9 / 2, then the dimension of the bottom beam 14 along the first direction is small, which will weaken the rigidity of the housing 10, thereby reducing its ability to constrain the displacement of the battery pack 201.

[0076] According to the battery pack 100 provided by this utility model, the ratio of the dimension of the fixing plate 40 along the first direction to the dimension of the bottom beam 14 along the first direction is limited to the above-mentioned numerical range, which can ensure both the connection strength between the fixing plate 40 and the first cold plate 31 and the rigidity of the housing 10.

[0077] As one possible implementation, in the first direction, the dimension of the fixing plate 40 is D3 mm, where 14 mm ≤ D3 mm ≤ 90 mm. For example, D3 mm can be 14 mm, 15 mm, 16 mm, 18 mm, 20 mm, 22 mm, 25 mm, 28 mm, 30 mm, 35 mm, 40 mm, 50 mm, 60 mm, 75 mm, 80 mm, 85 mm, or 90 mm.

[0078] If the dimension of the fixing plate 40 along the first direction is too small, i.e. less than 14 mm, it will reduce the connection strength between the fixing plate 40 and the first cold plate 31, and increase the difficulty of connecting the fixing plate 40 and the first cold plate 31. If the dimension of the fixing plate 40 along the first direction is too large, i.e. greater than 90 mm, it will increase the risk of short circuit caused by its contact with the terminal post 23 of the battery 20.

[0079] According to the battery pack 100 provided by this utility model, the size of the fixing plate 40 along the first direction is limited to the above-mentioned numerical range, which can ensure the connection strength between the fixing plate 40 and the first cold plate 31, without excessively increasing the difficulty of connecting the fixing plate 40 and the first cold plate 31, and at the same time reduce the risk of short circuit caused by the contact between the fixing plate 40 and the terminal post 23.

[0080] As one possible implementation, in the first direction, the dimension of the bottom beam 14 is D4 mm, where 20 mm ≤ D4 mm ≤ 90 mm. For example, D4 ​​mm can be 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 70 mm, 80 mm, 85 mm, or 90 mm.

[0081] If the dimension of the bottom beam 14 along the first direction is too small, i.e. less than 20 mm, it will weaken the rigidity of the housing 10, thereby reducing its ability to constrain the displacement of the battery pack 201. In addition, this implementation will also reduce the installation space of the fixing structure 50. If the dimension of the bottom beam 14 along the first direction is too large, i.e. greater than 90 mm, it will increase the dimension of the battery pack 100 in the first direction, which is not conducive to the space utilization efficiency and structural compactness of the battery pack 100.

[0082] According to the battery pack 100 provided by this utility model, the dimensions of the bottom beam 14 along the first direction are limited to the above-mentioned numerical range, which can ensure the rigidity of the box 10 and the installation space of the fixing structure 50, as well as the space utilization efficiency and structural compactness of the battery pack 100.

[0083] refer to Figure 5 Each battery pack 201 also includes an end plate 60 stacked at one end of the battery pack 201 in a first direction. The two end plates 60 of the two battery packs 201 face each other, and both end plates 60 are fixedly connected to the fixing structure 50. According to the present invention, the battery pack 100 provides two end plates 60 between the two battery packs 201, and the two end plates 60 are connected by the fixing structure 50, which can achieve a stable connection between the two battery packs 201. In addition, since the main stress point of the connection is independent of the two battery packs 201, this implementation method can also avoid squeezing, deformation or damage caused by mechanical fixing and constraint directly acting on the two battery packs 201, thereby improving the structural safety and reliability of the entire battery pack 100.

[0084] refer to Figure 5The fixed structure 50 includes a support plate 51 and a support 52. The support plate 51 is located on the upper side of the two end plates 60 and is fixedly connected to the two end plates 60. The support 52 is supported on the support plate 51 and fixed to the support plate 51. The fixed plate 40 is supported on the support 52 and fixed to the support 52. The support plate 51 can provide a flat and reliable mounting reference for the fixed plate 40, and the support 52 can transfer and distribute the load borne by the fixed plate 40 to the support plate 51, thereby improving the stability of the fixed structure 50 under vibration or impact conditions.

[0085] It should be noted that the upper side of the end plate 60 refers to the side of the end plate 60 that is away from the bottom plate of the housing 10.

[0086] refer to Figure 6 The support 52 includes a first plate portion 521, a second plate portion 522, a third plate portion 523, a fourth plate portion 524, and a fifth plate portion 525 connected sequentially. The first plate portion 521 and the fifth plate portion 525 are parallel to and fixedly connected to the support plate 51. The third plate portion 523 is parallel to and fixedly connected to the fixed plate 40. The second plate portion 522 and the fourth plate portion 524 are perpendicular to the third plate portion 523. The first plate portion 521, the third plate portion 523, and the fifth plate portion 525 are arranged along a second direction. By constructing multiple plate portions connected sequentially, the stiffness of the support 52 itself can be increased, thereby enhancing its ability to resist deformation in the first direction and ensuring the structural stability of the support 52. Furthermore, by using two plate portions, namely the first plate portion 521 and the fifth plate portion 525, to be fixedly connected to the support plate 51, the connection strength between the support 52 and the support plate 51 can also be increased. Since the beam extends along the first direction, the first plate 521, the third plate 523 and the fifth plate 525 are arranged in the same direction, so the support 52 can obtain a large arrangement space, providing sufficient space for installation operations and facilitating assembly.

[0087] refer to Figure 2 and Figure 8 The battery pack 100 also includes a second cold plate 32, which is located on both sides of the plurality of batteries 20 in a second direction. The fixing plate 40 includes a top plate 43 and two side plates 44. The top plate 43 extends along the second direction across the plurality of first cold plates 31 and is thermally connected to the plurality of first cold plates 31. The two side plates 44 extend downward from both ends of the top plate 43 in the first direction and are thermally connected to the second cold plates 32. The top plate 43 can constrain the displacement of the plurality of first cold plates 31 in the vertical direction, and the two side plates 44 can constrain the displacement of the two side plates 44 in the second direction. In this way, under adverse conditions such as impact or vibration, the fixing plate 40 can limit the first cold plates 31 and the second cold plates 32 to the installation position so as to maintain a stable contact area with the batteries 20, thereby ensuring that the heat exchange efficiency is not affected.

[0088] It should be understood that there are multiple ways to implement the battery pack 100 of this utility model, and it should not be construed as being limited to the embodiments described above. The following, in conjunction with... Figure 9 and Figure 10 The following are illustrative examples of variations of this disclosure. It should be noted that the foregoing embodiments and the following variations share some common elements. In the following variations, these elements will use the same reference numerals as in the foregoing embodiments to omit repeated descriptions.

[0089] refer to Figure 9 In the first variation, the fixing plate 40a can be located on the side of the plurality of first cold plates 31 near the plurality of batteries 20 and fixedly connected to the plurality of first cold plates 31. Since the fixing plate 40a is located on the side of the plurality of first cold plates 31 near the plurality of batteries 20, the side of the plurality of first cold plates 31 away from the plurality of batteries 20 can remain flat. This not only facilitates the installation of the cover, but also ensures that a uniform and reliable compression seal can be achieved between the cover and the sealing surface of the housing 10.

[0090] refer to Figure 9 The thickness of the fixed plate 40a is H12 mm, and the thickness of each of the multiple first cold plates 31 is H22 mm, where 1 / 10 ≤ H12 mm / H22 mm ≤ 3. For example, H12 mm / H22 mm can be 1 / 10, 1 / 6, 1 / 4, 1 / 3, 1 / 2, 3 / 5, 2 / 3, 3 / 4, 1, 5 / 4, 3 / 2, 7 / 4, 2, 5 / 2, or 3.

[0091] If the ratio of the thickness of the fixed plate 40a to the thickness of the first cold plate 31 is small, i.e., less than 1 / 10, then the thickness of the fixed plate 40a is small. This reduces the connection strength between the fixed plate 40a and the multiple first cold plates 31. Therefore, under adverse conditions such as impact or vibration, the connection between the first cold plate 31 and the battery 20 is easily damaged, resulting in the failure of the constraint on the first cold plate 31. If the ratio of the thickness of the fixed plate 40a to the thickness of the first cold plate 31 is large, i.e., greater than 3, then the thickness of the first cold plate 31 is small. This results in a smaller flow rate of the heat exchange medium, leading to a poorer heat exchange effect of the first cold plate 31.

[0092] According to the battery pack 100a provided by this utility model, the ratio of the thickness of the fixing plate 40a to the thickness of the first cold plate 31 is limited to the above-mentioned numerical range, which can ensure both the connection stability between the fixing plate 40a and the multiple first cold plates 31 and the heat exchange effect of the first cold plates 31.

[0093] As one possible implementation, the thickness of the fixing plate 40a is H12 mm, where 1 mm ≤ H12 mm ≤ 30 mm. For example, H12 mm can be 1 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 12 mm, 15 mm, 20 mm, 25 mm, or 30 mm.

[0094] If the thickness of the fixing plate 40a is small, i.e., less than 1 mm, it will reduce the connection strength between the fixing plate 40a and the multiple first cold plates 31. Therefore, under adverse working conditions such as impact or vibration, the connection between the first cold plates 31 and the battery 20 is easily damaged, resulting in the failure of the constraint on the first cold plates 31. If the thickness of the fixing plate 40a is large, i.e., greater than 30 mm, it will increase the vertical dimension of the fixing plate 40a, which is detrimental to the space utilization efficiency and structural compactness of the battery pack 100a. According to the battery pack 100a provided by this utility model, limiting the thickness of the fixing plate 40a to the above-mentioned numerical range can ensure both the connection stability between the fixing plate 40a and the multiple first cold plates 31 and the space utilization efficiency and structural compactness of the battery pack 100a.

[0095] It should be noted that, compared to the implementation where the fixing plate 40 is pressed against the side of the multiple first cold plates 31 away from the multiple batteries 20, the implementation where the fixing plate 40a is located on the side of the multiple first cold plates 31 close to the multiple batteries 20 can reduce the risk of the multiple first cold plates 31 being crushed. Therefore, the thickness of the fixing plate 40a can be appropriately increased to enhance the strength of the fixed connection between the two.

[0096] As one possible implementation, the thickness of the first cold plate 31 is H21 mm, where 4.8 mm ≤ H22 mm ≤ 10 mm. For example, H22 mm can be 4.8 mm, 5 mm, 5.2 mm, 5.5 mm, 5.8 mm, 6 mm, 6.2 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm.

[0097] If the thickness of the first cold plate 31 is small, i.e., less than 4.8 mm, the flow rate of the heat exchange medium will be small, resulting in poor heat exchange performance of the first cold plate 31. If the thickness of the first cold plate 31 is large, i.e., greater than 10 mm, the vertical dimension of the first cold plate 31 will increase, which is detrimental to the space utilization efficiency and structural compactness of the battery pack 100a. According to the battery pack 100a provided by this utility model, limiting the thickness of the first cold plate 31 to the above-mentioned range ensures both the connection stability between the fixing plate 40a and the multiple first cold plates 31 and the space utilization efficiency and structural compactness of the battery pack 100a.

[0098] refer to Figure 10 In the second variation, the fixing plate 40b includes a body portion 41 and a protrusion 42 protruding from the body portion 41. The projection of the body portion 41 in the second direction does not overlap with the projection of the plurality of first cold plates 31. The protrusion 42 extends between any two adjacent first cold plates 31 and abuts against the two opposite sides of the two first cold plates 31 in the second direction.

[0099] By fixing the protrusion 42 to the two first cold plates 31 on the side in the second direction, the connection strength between the fixing plate 40b and the first cold plates 31 can be enhanced, and the overall stability of the multiple first cold plates 31 can be further enhanced.

[0100] Furthermore, since it abuts against the two opposite sides of the two first cold plates 31 in the second direction, after the fixing plate 40b is installed in place, the side of the protrusion 42 away from the main body 41 will not exceed the two first cold plates 31 in the vertical direction, which helps to improve the space utilization efficiency and structural compactness of the battery pack 100b.

[0101] <Example Electrical Equipment> refer to Figure 11 This utility model provides an electrical device 200, which includes a battery pack 100, a battery pack 100a, or a battery pack 100b.

[0102] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0103] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0104] In a non-restrictive example, refer to Figure 11 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100, battery pack 100a, or battery pack 100b can be used as a power source to provide power to the electric vehicle 200.

[0105] It should be understood that the term "comprising" and its variations used in this utility model are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0106] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as the first cold plate and the second cold plate), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0107] The scope of protection of this utility model is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack (100), characterized in that, include: The box body (10) is provided with a top cover (11) and a box wall (12), the top cover (11) and the box wall (12) forming an accommodating space (13); Multiple batteries (20) are stacked along a first direction and housed in the housing space (13); Multiple first cold plates (31) are located on top of the multiple batteries (20), each first cold plate (31) extends along the first direction and the multiple first cold plates (31) are spaced apart along the second direction, the first direction, the second direction and the up and down direction are perpendicular to each other; A fixed plate (40) extends across the plurality of first cold plates (31) in the second direction and is thermally connected to the plurality of first cold plates (31) to restrict the upward displacement of the plurality of first cold plates (31); as well as A fixed structure (50) is used to fix the housing (10) and the fixed plate (40).

2. The battery pack (100) according to claim 1, characterized in that, The fixing plate (40) presses against the side of the plurality of first cold plates (31) away from the plurality of batteries (20).

3. The battery pack (100) according to claim 2, characterized in that, The fixing plate (40) is fixedly connected to the plurality of first cold plates (31).

4. The battery pack (100) according to claim 2, characterized in that, The thickness of the fixing plate (40) is H11 mm, and the thickness of each of the plurality of first cold plates (31) is H21 mm, 1 / 10≤H11 mm / H21 mm≤25 / 12.

5. The battery pack (100) according to claim 4, characterized in that, The thickness of the fixing plate (40) is H11 mm, 1 mm ≤ H11 mm ≤ 10 mm, and the thickness of the first cold plate (31) is H21 mm, 4.8 mm ≤ H21 mm ≤ 10 mm.

6. The battery pack (100) according to claim 1, characterized in that, The fixing plate (40) is located on the side of the plurality of first cold plates (31) close to the plurality of batteries (20) and is fixedly connected to the plurality of first cold plates (31).

7. The battery pack (100) according to claim 6, characterized in that, The thickness of the fixing plate (40) is H12 mm, and the thickness of each of the plurality of first cold plates (31) is H22 mm, 1 / 10≤H12 mm / H22 mm≤3.

8. The battery pack (100) according to claim 7, characterized in that, The thickness of the fixing plate (40) is H12 mm, 1 mm ≤ H12 mm ≤ 30 mm, and the thickness of the first cold plate (31) is H21 mm, 4.8 mm ≤ H22 mm ≤ 10 mm.

9. The battery pack (100) according to any one of claims 2 to 8, characterized in that, The fixing plate (40) includes a body part (41) and a protrusion (42) protruding from the body part (41). The projection of the body part (41) in the second direction does not overlap with the projection of the plurality of first cold plates (31). The protrusion (42) extends between any two adjacent first cold plates (31) and abuts against the two opposite sides of the two first cold plates (31) in the second direction.

10. The battery pack (100) according to any one of claims 1 to 8, characterized in that, The housing (10) includes a bottom beam (14) extending along the second direction, the bottom beam (14) dividing the housing (10)’s accommodating space (13) into two accommodating compartments, the plurality of batteries (20) forming two battery packs (201), the two battery packs (201) being respectively accommodated in the two accommodating compartments, the fixing structure (50) being located on the bottom beam (14) and fixingly connecting the bottom beam (14) and the fixing plate (40).

11. The battery pack (100) according to claim 10, characterized in that, Each battery (20) has a terminal post (23) on its top, and the fixing plate (40) does not cover the terminal post (23).

12. The battery pack (100) according to claim 11, characterized in that, In the first direction, the minimum distance from the fixing plate (40) to the pole post (23) is D1 mm, where 8 mm ≤ D1 mm ≤ 50 mm.

13. The battery pack (100) according to claim 11, characterized in that, The number of the poles (23) is two, and each battery (20) also includes an explosion-proof valve (24) located between the two poles (23) in the second direction, and the fixing plate (40) does not cover the explosion-proof valve (24).

14. The battery pack (100) according to claim 13, characterized in that, In the first direction, the minimum distance from the fixing plate (40) to the explosion-proof valve (24) is D2 mm, 4.25 mm ≤ D2 mm ≤ 46.25 mm.

15. The battery pack (100) according to claim 10, characterized in that, In the first direction, the size of the fixing plate (40) is D3 mm, the size of the bottom beam (14) is D4 mm, and 7 / 45≤D3 mm / D4 mm≤9 / 2.

16. The battery pack (100) according to claim 15, characterized in that, In the first direction, the size of the fixing plate (40) is D3 mm, 14 mm ≤ D3 mm ≤ 90 mm.

17. The battery pack (100) according to claim 10, characterized in that, In the first direction, the dimensions of the bottom beam (14) are D4 mm, 20 mm ≤ D4 mm ≤ 90 mm.

18. The battery pack (100) according to claim 10, characterized in that, Each battery pack (201) also includes an end plate (60) stacked at one end of the battery pack (201) in the first direction, the two end plates (60) of the two battery packs (201) facing each other, the fixing structure (50) includes a support plate (51) and a support (52), the support plate (51) is located on the upper side of the two end plates (60) and fixedly connected to the two end plates (60), the support (52) is supported on the support plate (51) and fixed to the support plate (51), the fixing plate (40) is supported on the support (52) and fixed to the support (52), the support (52) is ... 2) It includes a first plate portion (521), a second plate portion (522), a third plate portion (523), a fourth plate portion (524), and a fifth plate portion (525) connected in sequence. The first plate portion (521) and the fifth plate portion (525) are parallel to and fixedly connected to the support plate (51). The third plate portion (523) is parallel to and fixedly connected to the fixing plate (40). The second plate portion (522) and the fourth plate portion (524) are perpendicular to the third plate portion (523). The first plate portion (521), the third plate portion (523), and the fifth plate portion (525) are arranged along the second direction.

19. The battery pack (100) according to claim 9, characterized in that, It also includes a second cold plate (32) located on both sides of the plurality of batteries (20) in the second direction. The fixing plate (40) includes a top plate (43) and two side plates (44). The top plate (43) extends across the plurality of first cold plates (31) in the second direction and is thermally connected to the plurality of first cold plates (31). The two side plates (44) extend downward from both ends of the top plate (43) in the first direction and are thermally connected to the second cold plate (32).

20. An electrical appliance, characterized in that, The battery pack (100) includes any one of claims 1 to 19.

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