Battery pack and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery pack and electric equipment. The battery pack comprises a battery box body which comprises a bottom plate and boundary beams connected to two opposite side edges of the bottom plate; the battery assembly is arranged on the bottom plate, and the two opposite side faces of the battery assembly in the first direction correspond to the edge beams respectively; the fixing pieces are arranged between the side surfaces of the battery assemblies and the corresponding edge beams so as to fix the battery assemblies; the heat insulation plate is connected to the side face of the battery assembly to isolate the battery assembly from the fixing piece, and the heat insulation plate is of a hollow structure. The heat insulation structure and the fixing mode of the battery pack are improved, a certain air gap is reserved between the battery assembly and the fixing piece through the hollow heat insulation plate so as to improve the heat insulation performance and reduce heat loss, meanwhile, the fixing piece can penetrate through the reserved connecting channel to be connected with the battery assembly, and the heat insulation performance of the battery pack is improved. Therefore, the battery assembly and the battery box body are connected into a whole, so that the whole battery keeps relatively high structural strength, and the strength requirement is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery pack and electrical equipment. Background Art

[0002] With the rapid development of battery technology, common batteries are usually produced in the form of battery packs. In order to improve the structural strength of the battery pack, high-density, high-strength potting glue is usually filled between the battery and the box side beam as a fixing part to bond the battery and the box as a whole. However, since the high-density potting glue is connected to the battery and the box side beam as a whole after solidification, the heat of the battery will be directly transferred to the side beam through the potting glue in a low temperature environment, and then diffused to the external environment. That is, the potting glue as a fixing part accelerates the diffusion of battery heat, resulting in a decrease in the thermal insulation performance of the battery pack and affecting the cycle life of the battery. Utility Model Content

[0003] In view of this, in order to improve at least one of the above-mentioned problems existing in the prior art, the utility model provides a battery pack and an electrical device.

[0004] The first technical solution of the utility model provides a battery pack, including: a battery box, including a bottom plate and side beams connected to opposite side edges of the bottom plate; a battery assembly, arranged on the bottom plate, and the opposite side surfaces of the battery assembly along a first direction correspond to the side beams respectively; a fixing member, arranged between the side surface of the battery assembly and the corresponding side beam to fix the battery assembly; a heat insulation plate, connected to the side surface of the battery assembly to isolate the battery assembly and the fixing member, and the heat insulation plate is a hollow structure.

[0005] In a feasible implementation, the heat insulation plate partially isolates the battery assembly and the fixing member; wherein, one end of the heat insulation plate close to the bottom plate is at a preset distance from the bottom plate to form a connecting channel, and a fixing member is provided in the connecting channel; one end of the heat insulation plate away from the bottom plate is higher than the fixing member.

[0006] In a feasible implementation, the preset distance is h, the height of the battery assembly is H, and 0.5≤h / H≤0.7.

[0007] In a feasible implementation, the insulation board includes two side walls arranged opposite to each other along a first direction and a hollow chamber formed between the two side walls, the distance between the side surface of the battery assembly and the side beam along the first direction is x, the total thickness of the insulation board is y, the thickness of the hollow chamber is a, the thermal conductivity of the fixing part is λ1, the thermal conductivity of the insulation board is λ2, (ya) / λ2+38.45a>y / λ1; (xy) / λ1+(ya) / λ2+38.45a>1 / 3.

[0008] In a feasible implementation, an opening communicating with the outside is provided at one end of the heat insulation board away from the bottom plate.

[0009] In a feasible implementation, the interior of the heat insulation board is a closed chamber, and an interface valve for vacuuming is provided on the heat insulation board.

[0010] In a feasible implementation, the heat insulation board is a non-metallic structure, and the heat insulation board is bonded and fixed to the battery assembly.

[0011] In a feasible implementation, the fixing member includes a first fixing portion and a second fixing portion with different thermal conductivities; the first fixing portion fills the connecting channel and connects the side of the battery assembly and the corresponding side beam; the second fixing portion is located on the side of the first fixing portion away from the bottom plate, and connects the heat insulation board and the corresponding side beam.

[0012] In a feasible implementation, one of the first fixing part and the second fixing part is made of non-foaming glue, and the other is made of foaming glue; or

[0013] The first fixing part and the second fixing part are both made of foamed rubber, and the thermal conductivity of the first fixing part is smaller than the thermal conductivity of the second fixing part.

[0014] The technical solution of the second aspect of the utility model provides an electrical device, including the battery pack of any one of the above-mentioned first aspect.

[0015] The beneficial effects of the above technical solution of the utility model are embodied in:

[0016] The thermal insulation structure and fixing method of the battery have been improved. A hollow thermal insulation plate is used to reserve a certain air gap between the battery assembly and the fixing parts to improve the thermal insulation performance and reduce heat loss to meet the battery's operating temperature requirements, which is beneficial to extending the battery's cycle life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a three-dimensional schematic diagram of a battery pack provided by an embodiment of the utility model.

[0018] Figure 2 Shown is a cross-sectional view of a battery pack provided by an embodiment of the utility model.

[0019] Figure 3 Shown is a top view of a battery pack provided by an embodiment of the utility model.

[0020] Figure 4 Shown is a cross-sectional view of a battery pack provided by an embodiment of the utility model.

[0021] Figure 5 Shown is a cross-sectional view of a heat insulation board provided by an embodiment of the utility model.

[0022] Figure 6Shown is a partial schematic diagram of the internal structure of a conventional battery provided by an embodiment of the utility model.

[0023] Figure 7 Shown is a schematic diagram of the internal structure of another conventional battery provided by an embodiment of the utility model.

[0024] Figure 8 Shown is a three-dimensional schematic diagram of a heat insulation board provided by an embodiment of the utility model.

[0025] Fig. 9 Shown Figure 8 Enlarged view of part A.

[0026] Fig.10 Shown is a three-dimensional schematic diagram of another heat insulation board provided by an embodiment of the utility model.

[0027] Fig.11 Shown Fig.10 A cross-sectional view of a heat shield is shown in FIG.

[0028] Fig.12 Shown is a cross-sectional view of another battery pack provided by an embodiment of the utility model.

[0029] In the above drawings, the direction indicated by arrow F1 is the height direction, the direction indicated by arrow F2 is the first direction (i.e. the lateral direction of the battery box), and the direction indicated by arrow F3 is the second direction (i.e. the longitudinal direction of the battery box).

[0030] Description of reference numerals:

[0031] 1 battery box, 11 side beams, 12 bottom plate, 13 connecting channel;

[0032] 2 battery components;

[0033] 3 heat insulation board, 31 hollow chamber, 32 opening, 33 interface valve;

[0034] 4 fixing member, 41 first fixing portion, 42 second fixing portion;

[0035] 500' existing battery, 510' battery, 520' potting glue, 530' side beam. DETAILED DESCRIPTION

[0036] In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their deformations are intended to cover non-exclusive inclusions. For example, the process, method, system, product or equipment comprising a series of steps or units are not limited to the steps or units listed, but optionally also include the steps or units not listed, or optionally also include other steps or units inherent to these processes, methods, products or equipment.

[0037] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Application Overview

[0040] With the rapid development of battery technology, common batteries are usually produced in the form of battery packs. In order to improve the structural strength of the battery pack, high-density, high-strength potting glue is usually filled between the battery and the box side beam as a fixing part to bond the battery to the box to meet the strength requirements. However, since the battery needs to meet certain insulation requirements in a low-temperature environment, and the high-density potting glue has good thermal conductivity, it is connected to the battery and the box side beam as a whole after solidification. In a low-temperature environment, the heat of the battery will be directly transferred to the side beam through the potting glue, and then diffused to the external environment. That is, the potting glue as a fixing part accelerates the diffusion of battery heat, resulting in a decrease in the thermal insulation performance of the battery pack and affecting the cycle life of the battery. If an insulation layer is set between the battery and the box to isolate the battery, it is difficult to achieve the potting bonding between the battery and the side wall of the box, which will cause the overall strength of the battery to decrease. Due to the above-mentioned defects in the existing battery structure, it is difficult to take into account both structural strength and thermal insulation performance.

[0041] Some embodiments of the battery pack and the electrical equipment in the technical solution of the utility model are provided below.

[0042] In an embodiment of the first aspect of the present utility model, a battery pack is provided, such as Figure 1 and Figure 2 As shown, the battery includes a battery case 1, a battery assembly 2, a heat insulation board 3 and a fixing member 4. The battery case 1 includes a bottom plate 12 and side beams 11 on at least two opposite sides. The battery assembly 2 is arranged on the bottom plate 12 in the battery case 1, and the two side surfaces of the battery assembly 2 opposite to each other along the first direction are respectively arranged corresponding to the two side beams 11. The fixing member 4 is arranged between the side surface of the battery assembly 2 and the corresponding side beam 11 to fix the battery assembly 2. The heat insulation board 3 is arranged between the side surface of the battery assembly 2 and the fixing member 4, and is connected to the battery assembly 2 to isolate the battery assembly 2 from the fixing member 4. Among them, the heat insulation board 3 is a hollow structure, which can form a reserved gap between the battery assembly 2 and the fixing member 4.

[0043] It is understandable that in the existing battery production process, in order to ensure the overall structural strength of the battery, the battery and the box are usually connected by potting. The potting glue has thermal conductivity, which will conduct part of the heat of the battery to the box and diffuse to the outside, affecting the thermal insulation performance of the battery, especially seriously affecting the battery performance in low temperature environments.

[0044] The battery in this embodiment has improved insulation structure and fixing method, and uses hollow insulation board to reserve a certain air gap between battery assembly and fixing parts, which plays a role in increasing thermal resistance, so as to improve thermal insulation performance and reduce heat loss, so as to meet the battery's operating temperature requirements, which is beneficial to prolonging the cycle life of the battery and improving the battery's performance.

[0045] It should be noted that, in practical applications, the fixing member 4 is not limited to the potting glue. Figure 1 and Figure 3 As shown in the figure, only the fixing members 4 are arranged at the two lateral ends of the battery assembly 2 to fix them to the battery box 1. When the two longitudinal ends of the battery assembly 2 also need to be fixed, the fixing members 4 can also be arranged in the longitudinal direction to fix them to the battery box 1. Based on this, not only the heat insulation plates 3 can be arranged at the two lateral ends of the battery assembly 2, but also the heat insulation plates 3 can be arranged at the two longitudinal ends of the battery assembly 2. The specific arrangement can be based on the assembly requirements; the battery assembly 2 can include one or more groups of batteries. When the battery group is a group, the fixing members 4 are arranged on both sides of the battery group to ensure the connection strength of the battery group. When multiple groups of batteries are arranged, the multiple groups of batteries are arranged along the first direction, and each group of batteries can be arranged along the second direction. For example Figure 3 The two groups shown in the figure can be fixed on both sides of the multiple groups of batteries to improve the overall energy density. The situation in the following embodiments is the same.

[0046] In a further embodiment of the present invention, Figure 2 , Figure 4 As shown, in the height direction, the distance between the end of the heat insulation board 3 close to the bottom plate 12 of the battery box 1 and the bottom plate 12 is preset, so that a connecting channel 13 is formed between the heat insulation board 3 and the bottom plate 12; the connecting channel 13 is provided with a fixing member 4, so that the fixing member 4 passes through the connecting channel 13 and connects the battery assembly 2 and the side beam 11, and the area on the side of the battery assembly 2 where the heat insulation board 3 is provided is isolated from the side beam 11 by the fixing member 4. Among them, the end of the heat insulation board 3 away from the bottom plate 12 is higher than the fixing member 4, so that when the potting glue is used as the fixing member 4, a certain space can be reserved in the height direction, and the heat insulation board 3 is used for protection to prevent the glue from flowing over the heat insulation board 3 to the battery assembly 2 and affecting the isolation effect.

[0047] In this embodiment, by providing a connecting channel 13, the fixing member 4 can pass through the insulation plate 3 to connect the battery assembly 2 and the side beam 11, so that the battery assembly 2 is connected and fixed to the battery box 1, so that the overall structural strength of the battery pack can be maintained at a high level, so as to meet the requirements of structural strength and thermal insulation at the same time, which is conducive to further improving battery performance.

[0048] Furthermore, in a specific implementation, Figure 2 and Figure 4 As shown, the height of the battery assembly 2 is H, and the preset distance between the heat insulation board 3 and the bottom plate 12 is h, that is, the height of the connecting channel 13 is h, and 0.5≤h / H≤0.7 is satisfied, so as to take into account both structural strength and thermal insulation performance. It can be understood that if h / H is too small, the contact area between the battery assembly 2 and the fixing member 4 is small, and the connection strength between the battery assembly 2 and the side beam 11 of the battery box 1 is not high; if h / H is too large, the connection area between the heat insulation board 3 and the battery box 1 is small, and the contact area between the fixing member 4 and the battery assembly 2 is large, which will lead to a decrease in thermal insulation performance, and more heat from the battery assembly 2 is transferred to the side beam 11 through the fixing member 4 and diffused outward. The above-mentioned size design in this embodiment is relatively moderate, and can take into account both structural strength and thermal insulation requirements.

[0049] Furthermore, as 4 and Figure 5 As shown, the heat insulation board 3 includes two side walls arranged opposite to each other along a first direction and a hollow chamber 31 formed between the two side walls. In the first direction, the distance between the side of the battery assembly 2 and the corresponding side beam 11 is x, that is, the distance between the side of the battery assembly 2 close to the side beam 11 and the side beam 11 is x, the total thickness of the heat insulation board 3 is y, the thickness of the hollow chamber 31 is a, the thermal conductivity of the fixing member 4 is λ1, the thermal conductivity of the heat insulation board 3 is λ2, and the following relationship is satisfied:

[0050] Relationship 1: (ya) / λ2+38.45a>y / λ1;

[0051] Relationship 2: (xy) / λ1+(ya) / λ2+38.45a>1 / 3.

[0052] In this embodiment, the thermal insulation effect is further enhanced by setting relevant parameters to satisfy the above relationship.

[0053] For example, Figure 6 , a structure of an existing battery 500' completely filled with potting glue is shown. In this embodiment, as a comparative scheme 1, the space between the battery 510' and the side beam 530' is completely filled with potting glue 520'; Figure 7 , a structure of a conventional battery 500' partially filled with potting glue is shown. In this embodiment, as a comparative scheme 2, a portion between the battery 510' and the side beam 530' is filled with potting glue 520'; Figure 4 and Figure 5 2 shows the structure of the heat insulation board 3 arranged between the fixing member 4 and the battery assembly 2 in this embodiment. In this embodiment, as scheme 3, the fixing member 4 is specifically in the form of potting glue.

[0054] In the above three schemes, the quality of the thermal insulation effect depends on the thermal resistance R between the battery assembly (battery) and the side beam (R1 in comparison scheme one, R2 in comparison scheme two, and R3 in scheme three), and the thermal resistance depends on the distance x between the side beam and the battery assembly (battery), the thermal conductivity λ1 of the potting glue, the total thickness y of the insulation board, the gap a of the hollow chamber 31 of the insulation board, and the thermal conductivity λ2 of the insulation board. Among them, the thermal conductivity λ1 of the potting glue satisfies 0.01<λ1<2W / (m·K), and the thermal conductivity of air is 0.026W / (m·K). In scheme three, the total thickness y of the insulation board 3 is less than the distance x between the side beam 11 and the battery assembly 2, that is, x / y>1.

[0055] Compared with Scheme 1, when the thermal resistance is R3>R1, Scheme 3 has better thermal insulation performance than Scheme 1. By calculating the thermal resistances R3 and R1 and substituting them into the inequality R3>R1, we can get Relationship 1 by substituting the parameters:

[0056] (ya) / λ2+38.45a>y / λ1.

[0057] Compared with Scheme 2, when the thermal resistance is R3>R2, Scheme 3 has better thermal insulation performance than Scheme 2. The following relationship can be obtained by calculation: thermal resistance of insulation board 3 + thermal resistance of potting glue > air thermal resistance (air thermal resistance = 1 / convection heat transfer coefficient). Substituting the parameters into the relationship 2:

[0058] (xy) / λ1+(ya) / λ2+38.45a>1 / 3.

[0059] Specifically, specific values ​​can be substituted into equation 1 and equation 2 for verification. When x=20mm, a=5mm, y=7mm, λ1=0.1W / (m·K), λ2=0.07W / (m·K), substituted into equation 1, we get: 0.22>0.07, that is, thermal resistance R3>R1, substituted into equation 2, we get: 0.35>0.33, that is, thermal resistance R3>R2, at this time, the thermal insulation performance of scheme 3 is the best.

[0060] When x=20mm, a=5mm, y=7mm, λ1=0.05W / (m·K), λ2=0.1W / (m·K), substituting into equation 1, we get: 0.21>0.14, that is, thermal resistance R3>R1; substituting into equation 2, we get: 0.47>0.33, that is, thermal resistance R3>R2. At this time, Scheme 3 has the best thermal insulation performance.

[0061] It can be seen from the above examples that the battery pack solution in the utility model (i.e., Solution 3) has the best thermal insulation performance, obvious advantages and better technical effects, compared with Comparative Solution 1 and Comparative Solution 2 and similar existing battery solutions.

[0062] Furthermore, if Figure 4 and Figure 5 As shown, the total thickness y of the heat insulation board 3 is in the range of 1.2mm to 12.5mm, wherein the wall thickness b of the heat insulation board 3 is in the range of 0.1mm to 3mm, and the gap size a of the hollow chamber 31 in the heat insulation board 3 is in the range of 1mm to 6.5mm. It can be understood that if the gap size a of the hollow chamber 31 is too small, the two walls of the heat insulation board 3 are easy to contact, affecting the heat insulation performance, while if the gap size a is too large, natural convection will occur and accelerate heat transfer. Under normal circumstances, the air in the gap below 6.5mm generally does not produce natural convection, or the convection heat transfer coefficient is very small and can be ignored. Through the above-mentioned size design, it is possible to effectively prevent the air convection from being generated in the hollow chamber 31 of the heat insulation board 3 and conduct heat, thereby further increasing the thermal resistance and improving the insulation effect. At the same time, the wall thickness design of the heat insulation board 3 takes into account the strength, weight, material and other aspects, can meet the strength requirements and is not easy to deform. At the same time, the weight increase is within a limited range and will not have a significant impact on the overall weight.

[0063] It should be noted that according to the theoretical knowledge of heat transfer, the flow in the vertical interlayer mainly depends on the Gr number with the thickness of the interlayer as the characteristic scale: Gr = gα (t h -t c )σ 3 / v2 Among them, g is the acceleration due to gravity, α is the volume expansion coefficient, and t h is the high temperature, t c is the low temperature, σ is the interlayer gap, and ν is the kinematic viscosity. For the vertical interlayer, when Gr≤2860, heat transfer depends on thermal conduction. When this value is exceeded, natural convection is formed in the interlayer. Substituting the parameters into the above formula and calculating, it can be obtained that when the thickness of the hollow chamber is greater than 6.5mm, Gr>2860, heat transfer is carried out in the form of convection. Therefore, when the gap a of the hollow chamber 31 of the insulation board 3 is ≤6.5mm, natural convection will generally not occur, or the natural convection is very weak, and the convection thermal conductivity is very small and can be ignored.

[0064] Preferably, the heat insulation board 3 is made of non-metallic material. It is understandable that the thermal conductivity of non-metallic material is poor compared to that of metal material, which is conducive to improving the thermal insulation effect. Specifically, a material with a thermal conductivity slightly greater than that of foam can be used, and the thermal conductivity is relatively small compared to that of metal material. During assembly, the heat insulation board 3 can be bonded and fixed to the battery assembly by gluing.

[0065] Furthermore, in a specific implementation, Figure 4 , Figure 8 and Fig. 9 As shown, the end of the heat insulation board 3 away from the bottom plate is provided with an opening 32 connected to the outside, so that the hollow chamber 31 can exchange airflow with the outside. On the one hand, the hollow chamber 31 can be used to form an air gap to increase thermal resistance, and on the other hand, it is also conducive to heat dissipation. Preferably, as Figure 5 In the example in the figure, the top of the heat insulation board 3 in the height direction can be directly designed as an open structure without a top plate, so that the four side plates of the heat insulation board 3 enclose an opening 32, and the opening area can be increased as much as possible to facilitate heat insulation. Of course, in actual applications, the heat insulation board 3 can also be designed to have a top plate according to specific assembly requirements or strength requirements, and corresponding openings 32 are opened on the top plate, wherein the number of openings 32 can be one or more, and in particular, the top plate can also be designed as a grid structure as needed.

[0066] Furthermore, in another specific implementation, as Figure 4 , Fig.10 and Fig.11 As shown, the hollow chamber 31 inside the heat insulation board 3 is a closed chamber, and accordingly, an interface valve 33 for vacuuming is provided on the heat insulation board 3. When in use, the hollow chamber 31 can be vacuumed through the interface valve 33 to put the hollow chamber 31 in a vacuum state, thereby further reducing the thermal conductivity of the heat insulation board 3 and improving the thermal insulation performance.

[0067] In a further embodiment of the present invention, Figure 1 and Fig.12 As shown, the fixing member 4 specifically includes a first fixing portion 41 and a second fixing portion 42, and the first fixing portion 41 and the second fixing portion 42 have different thermal conductivity coefficients; the second fixing portion 42 is located on a side of the first fixing portion 41 away from the bottom plate 12, and is connected to the heat insulation board 3 and the corresponding side beam 11. Fig.12 In the example, in the height direction, the first fixing portion 41 is located below the second fixing portion 42, and the first fixing portion 41 fills the connection channel 13 below the heat insulation board 3 and connects the battery assembly 2 and the corresponding side beam 11 in the first direction. The second fixing portion 42 is located above the first fixing portion 41, and the second fixing portion 42 connects the heat insulation board 3 and the corresponding side beam 11. By layering the fixing parts into different fixing portions in the height direction, the difference in thermal conductivity of the two fixing portions can further improve the thermal insulation performance of the battery pack.

[0068] Specifically, since the first fixing part 41 is directly connected to the battery assembly, and there is a heat insulation board 3 between the second fixing part 42 and the battery assembly 2, when the first fixing part 41 and the second fixing part 42 are made of materials with the same thermal conductivity, the thermal conductivity of the first fixing part 41 located at the bottom is stronger than that of the second fixing part 42 at the top, which easily causes temperature differences in different areas above and below the battery assembly 2. Preferably, the thermal conductivity of the first fixing part 41 can be set to be smaller than that of the second fixing part 42, so that the heat transfer capacity of the first fixing part 41 decreases, the difference in thermal insulation capacity between the two fixing parts of the fixing member 4 is reduced, and the overall thermal insulation effect is more uniform. Of course, in actual applications, other settings can also be adopted according to specific assembly requirements. For example, the first fixing part 41 can be set to use foam glue, and the second fixing part 42 can be set to use non-foam glue, which is specifically set according to actual application requirements. It should be noted that the foam glue used in the first fixing part 41 and the non-foam glue used in the second fixing part 42 are both prior art and are not limited here.

[0069] Furthermore, in a specific implementation, Fig.12 In the example, one of the first fixing part 41 and the second fixing part 42 can be made of foamed rubber and the other can be made of non-foamed rubber. Preferably, the first fixing part 41 is made of high-strength non-foamed rubber to enhance the connection strength, while the second fixing part 42 can be made of low-density foamed rubber to further reduce the heat conductivity of the second fixing part 42.

[0070] Furthermore, in another specific implementation, as Fig.12In the example in FIG. 1 , the first fixing portion 41 and the second fixing portion 42 may both be made of foamed glue, and the thermal conductivity of the first fixing portion 41 is smaller than the thermal conductivity of the second fixing portion 42. Through the above arrangement, the thermal conductivity of the first fixing portion 41 and the second fixing portion 42 can be reduced at the same time, and the difference in thermal conductivity between the battery assembly 2 and the area corresponding to the first fixing portion 41 and the second fixing portion 42 can be reduced, further enhancing the uniformity of the overall thermal insulation effect.

[0071] In a further embodiment of this embodiment, if Figures 1 to 5 As shown, the battery includes a battery box 1, a battery assembly 2, a heat shield 3 and a fixing member 4. The battery box 1 is a rectangular frame structure composed of a bottom plate 12 and four side beams 11, and a cavity suitable for accommodating the battery assembly 2 is formed inside. The battery assembly 2 includes two groups of batteries arranged side by side, such as Figure 3 In the example in FIG. 1 , the side end face of the battery faces the horizontal direction of the battery box 1 (i.e., the first direction), and the large face of the battery faces the longitudinal direction of the battery box 1 (i.e., the second direction); wherein a certain distance is reserved between the side end face of the battery and the corresponding side beam 11 of the battery box 1, and in both groups of batteries, the side end face located on the outer side of the battery is bonded with a heat insulation board 3, i.e. Figure 4 The left end face of a group of batteries on the left side of the middle view and the right end face of a group of batteries on the right side are both bonded with heat insulation boards 3. There is a preset spacing between each heat insulation board 3 and the bottom plate 12 of the battery box 1 to form a connecting channel 13; the fixing member 4 specifically uses potting glue. During the potting operation, the glue is poured into the space between the heat insulation board 3 and the corresponding side beam 11, and the glue passes through the connecting channel 13 and contacts the corresponding side end face of each adjacent battery. When the potting glue solidifies, the battery assembly 2 and the heat insulation board 3 are bonded to the bottom plate 12 and the side beam 11 of the battery box 1 through the potting glue to meet the structural strength requirements. Among them, the heat insulation board 3 can block part of the potting glue so that part of the side end surface of the battery in the battery assembly 2 is not in direct contact with the potting glue, and a hollow chamber 31 is provided in the heat insulation board 3 to form an air gap, so as to increase the thermal resistance between the battery assembly 2 and the side beam 11 through the heat insulation board 3, and utilize the heat insulation board 3 to play a role of heat insulation between the battery assembly 2 and the side beam 11, so as to reduce the heat of the battery assembly 2 from being transmitted to the outside of the side beam 11 through the potting glue serving as the fixing part 4, thereby reducing the heat loss to the outside.

[0072] Furthermore, in practical applications, according to specific assembly requirements, the battery box may also be provided with a top plate to cover the battery box.

[0073] In an embodiment of the second aspect of the utility model, an electric device is also provided. The electric device includes the battery pack in any embodiment of the first aspect, and the battery pack serves as a power supply device to supply power to the electric device.

[0074] The electrical equipment may specifically be an electric vehicle or other equipment suitable for being powered by the battery pack of the utility model.

[0075] In addition, the electrical equipment in this embodiment also has all the beneficial effects of the battery pack in any embodiment of the second aspect mentioned above, which will not be repeated here.

[0076] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0077] The block diagrams of the devices, apparatuses, equipment and systems involved in the present utility model are only illustrative examples and are not intended to require or imply that they must be connected, arranged and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment and systems can be connected, arranged and configured in any manner. Words such as "including", "comprising", "having" and the like are open words, referring to "including but not limited to" and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to" and can be used interchangeably with them. It should also be noted that in the apparatus and equipment of the present utility model, each component can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present utility model.

[0078] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize some variations, modifications, changes, additions and sub-combinations thereof. The above description of the disclosed aspects is provided to enable any technician in the field to make or use the utility model. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the utility model. Therefore, the utility model is not intended to be limited to the aspects shown herein, but in accordance with the widest range consistent with the principles and novel features of this utility model.

[0079] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery box (1) comprises a bottom plate (12) and side beams (11) connected to two opposite sides of the bottom plate (12); A battery assembly (2) is arranged on the bottom plate (12), and two opposite side surfaces of the battery assembly (2) along the first direction correspond to the side beams (11) respectively; A fixing member (4) is arranged between a side surface of the battery assembly (2) and the corresponding side beam (11) to fix the battery assembly (2); A heat insulation board (3) is connected to the side of the battery assembly (2) to isolate the battery assembly (2) and the fixing member (4); the heat insulation board (3) is a hollow structure.

2. The battery pack according to claim 1, characterized in that: The heat insulating plate (3) partially isolates the battery assembly (2) and the fixing member (4); wherein one end of the heat insulating plate (3) close to the bottom plate (12) is at a preset distance from the bottom plate (12) to form a connecting channel (13), and the fixing member (4) is arranged in the connecting channel (13); One end of the heat insulation board (3) away from the bottom plate (12) is higher than the fixing member (4).

3. The battery pack according to claim 2, characterized in that: The preset distance is h, the height of the battery assembly (2) is H, and 0.5≤h / H≤0.

7.

4. The battery pack according to claim 1, characterized in that: The heat insulation board (3) comprises two side walls arranged opposite to each other along the first direction and a hollow chamber (31) formed between the two side walls, the distance between the side surface of the battery assembly (2) and the side beam (11) along the first direction is x, the thickness of the heat insulation board (3) is y, the thickness of the hollow chamber (31) is a, the thermal conductivity of the fixing member (4) is λ1, the thermal conductivity of the heat insulation board (3) is λ2, (ya) / λ2+38.45a>y / λ1; (xy) / λ1+(ya) / λ2+38.45a>1 / 3.

5. The battery pack according to claim 2, characterized in that: An end of the heat insulation board (3) away from the bottom board (12) is provided with an opening (32) communicating with the outside.

6. The battery pack according to claim 2, characterized in that: The interior of the heat insulation board (3) is a closed chamber, and the heat insulation board (3) is provided with an interface valve (33) for vacuuming.

7. The battery pack according to claim 1, characterized in that: The heat insulation board (3) is a non-metallic structure, and the heat insulation board (3) is bonded and fixed to the battery assembly (2).

8. The battery pack according to any one of claims 2 to 3 or any one of claims 5 to 6, characterized in that: The fixing member (4) comprises a first fixing portion (41) and a second fixing portion (42) having different thermal conductivities; The first fixing portion (41) fills the connection channel (13) and connects the side surface of the battery assembly (2) and the corresponding side beam (11); The second fixing portion (42) is located on a side of the first fixing portion (41) away from the bottom plate (12), and is connected to the heat insulation board (3) and the corresponding side beam (11).

9. The battery pack according to claim 8, characterized in that: One of the first fixing part (41) and the second fixing part (42) is made of non-foaming rubber, and the other is made of foaming rubber; or The first fixing part (41) and the second fixing part (42) are both made of foamed rubber, and the thermal conductivity of the first fixing part (41) is smaller than the thermal conductivity of the second fixing part (42).

10. An electrical device, characterized in that: include: A battery pack as claimed in any one of claims 1 to 9.

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