Battery pack and electric device with same

Abstract

This utility model provides a battery pack and an electrical device having the same. The battery pack includes: a battery; an explosion-proof valve disposed on the battery; a heat exchange plate having an opening corresponding to the explosion-proof valve, the projection of the explosion-proof valve on the heat exchange plate being located within the opening; and a protective sheet disposed on the heat exchange plate and located on the side of the opening facing the explosion-proof valve, the area of ​​the protective sheet being greater than or equal to the area of ​​the opening. The technical solution provided by this application solves the problem in related technologies where the mica plate is lifted, leading to the risk of the thinned area of ​​the mica plate in other batteries being punctured, thus rendering the mica plate unable to protect the explosion-proof valve.

Description

Technical Field

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

[0002] The battery pack needs to be thermoelectrically separated, and the explosion-proof valve and the terminal post are not on the same surface of the battery.

[0003] In related technologies, a battery pack contains multiple batteries. Typically, a protective layer with impact resistance and heat insulation properties, such as a mica sheet, is affixed to the battery cover. Furthermore, the mica sheet is locally thinned at the location corresponding to the explosion-proof valve. This allows for more targeted breaching of the thinned area of ​​the out-of-control battery's mica sheet in the event of battery runaway, while also preventing ejected battery debris from rebounding and impacting the explosion-proof valves of other batteries.

[0004] However, using the method of pasting mica sheets may cause the mica sheets to be lifted up, and the battery ejection material may flow between the mica sheets and the batteries, which may cause the thinned areas of the mica sheets of other batteries to be punctured, thus preventing the mica sheets from playing their role in protecting the explosion-proof valve, and consequently causing thermal runaway. Utility Model Content

[0005] This utility model provides a battery pack and an electrical device having the same, to solve the problem in the related art where the mica plate is lifted up, which leads to the risk of the thinned area of ​​the mica plate of other batteries being broken, making the mica plate unable to protect the explosion-proof valve.

[0006] According to one aspect of the present invention, a battery pack is provided, the battery pack comprising: a battery; an explosion-proof valve disposed on the battery; a heat exchange plate having an opening corresponding to the explosion-proof valve, the projection of the explosion-proof valve on the heat exchange plate being located within the opening; and a protective sheet disposed on the heat exchange plate and located on the side of the opening facing the explosion-proof valve, the area of ​​the protective sheet being greater than or equal to the area of ​​the opening.

[0007] According to another aspect of the present invention, an electrical device is provided, which includes a battery pack, the battery pack being the one provided above.

[0008] By applying the technical solution of this utility model, since the protective sheet is set on the heat exchange plate and located on the side of the opening facing the explosion-proof valve, and the projection of the explosion-proof valve on the heat exchange plate is located within the opening, the area of ​​the protective sheet is greater than or equal to the area of ​​the opening. Therefore, the protective sheet can protect the explosion-proof valve. Furthermore, with the above structure, the heat exchange plate can limit the assembly of the protective sheet, preventing it from being lifted. This solves the problem in related technologies where the mica plate is lifted, leading to the risk of the thinned area of ​​the mica plate in other batteries being broken, thus rendering the mica plate unable to protect the explosion-proof valve. Attached Figure Description

[0009] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 A bottom view of the battery pack provided in an embodiment of the present invention is shown; Figure 2 A cross-sectional view of the battery pack provided in an embodiment of the present invention is shown.

[0010] The above figures include the following reference numerals: 10. Explosion-proof valve; 20. Heat exchange plate; 21. Opening; 22. Installation step; 30. Protective film; 40. Structural adhesive. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0012] like Figure 1 and Figure 2 As shown, this embodiment of the present invention provides a battery pack, which includes a battery, an explosion-proof valve 10, a heat exchange plate 20, and a protective sheet 30. The explosion-proof valve 10 is disposed on the battery, and the heat exchange plate 20 has an opening 21 corresponding to the explosion-proof valve 10, with the projection of the explosion-proof valve 10 on the heat exchange plate 20 located within the opening 21. The protective sheet 30 is disposed on the heat exchange plate 20 and located on the side of the opening 21 facing the explosion-proof valve 10, and the area of ​​the protective sheet 30 is greater than or equal to the area of ​​the opening 21.

[0013] Using the battery pack provided in this embodiment, since the protective sheet 30 is disposed on the heat exchange plate 20 and located on the side of the opening 21 facing the explosion-proof valve 10, and the projection of the explosion-proof valve 10 on the heat exchange plate 20 is located within the opening 21, the area of ​​the protective sheet 30 is greater than or equal to the area of ​​the opening 21. Therefore, the protective sheet 30 can protect the explosion-proof valve 10. Furthermore, with the above structure, the heat exchange plate 20 can limit the assembly of the protective sheet 30, preventing it from being lifted. This solves the problem in related technologies where the mica plate is lifted, leading to the risk of the thinned area of ​​the mica plate in other batteries being broken, thus preventing the mica plate from protecting the explosion-proof valve.

[0014] It should be noted that the protective plate 30 is set on the heat exchange plate 20 and located on the side of the opening 21 facing the explosion-proof valve 10. The area of ​​the protective plate 30 is greater than or equal to the area of ​​the opening 21, so that the protective plate 30 can completely cover the opening 21.

[0015] In this embodiment, the heat exchange plate 20 is a liquid-cooled plate.

[0016] In this embodiment, the area of ​​the protective sheet 30 is larger than the area of ​​the opening 21, the protective sheet 30 has a better protective effect, and the heat exchange plate 20 has a better assembly limiting effect on the protective sheet 30.

[0017] like Figure 2 As shown, in this embodiment, an installation step 22 is provided on the side of the opening 21 facing the explosion-proof valve 10, and the protective plate 30 is disposed on the installation step 22. The installation step 22 can better fix the protective plate 30, making it less likely to be washed away or overturned by high-temperature substances during battery thermal runaway, thereby ensuring the protective effect, improving the stability of the protective plate 30, and further enhancing the protection of the battery explosion-proof valve 10.

[0018] The depth of the mounting step 22 is greater than or equal to the thickness of the protective plate 30. By adjusting the depth of the mounting step 22, the protective plate 30 can be embedded within it, thereby preventing the protective plate 30 from being lifted or moved by high-temperature substances during battery thermal runaway, thus improving the stability of the protective plate 30. The connection between the protective plate 30 and the heat exchange plate 20 is more robust, maintaining its position even under extreme conditions, effectively blocking the direct impact of high-temperature substances on the explosion-proof valve 10.

[0019] In this embodiment, the depth of the mounting step 22 is greater than the thickness of the protective sheet 30. In other embodiments, the depth of the mounting step 22 may be less than the thickness of the protective sheet 30.

[0020] The thickness of the protective sheet 30 is D, where 0.05mm ≤ D ≤ 1mm. The selection of the thickness of the protective sheet 30 is based on a comprehensive consideration of its effectiveness in blocking high-temperature substances and its impact on the overall structure of the battery pack. By determining the optimal thickness range of the protective sheet 30, it is possible to effectively block high-temperature substances without excessively increasing the weight of the battery pack or occupying too much space, thus achieving both lightweight and high efficiency of the protective sheet 30 and improving the overall performance of the battery pack.

[0021] Specifically, the thickness D of the protective sheet 30 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, and other values ​​between 0.05mm and 1mm.

[0022] The depth of the mounting step 22 is H, where 0.05mm ≤ H ≤ 4mm. The depth of the mounting step 22 is set based on the need to secure the protective plate 30 and the space constraints of the battery pack. By determining the most suitable depth range, it is ensured that the protective plate 30 can be securely mounted on the heat exchange plate 20 without affecting the heat dissipation efficiency and overall structure of the battery pack. This results in a more stable installation of the protective plate 30 and a balance between the heat dissipation performance and structural strength of the battery pack.

[0023] Specifically, the depth H of the installation step 22 can be 0.05mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, and other values ​​between 0.05mm and 4mm.

[0024] like Figure 1 and Figure 2 As shown, the battery pack also includes structural adhesive 40, which fills the gaps between the battery and the heat exchange plate 20, between the explosion-proof valve 10 and the protective plate 30, and between the battery and the protective plate 30. The function of the structural adhesive 40 is to fill the gaps between the battery and the heat exchange plate 20, and between the explosion-proof valve 10 and the protective plate 30, thereby improving the sealing performance and overall structural stability of the battery pack. This makes the battery pack structure more robust and effectively resists external impacts. At the same time, the sealing effect of the structural adhesive 40 also prevents the high-temperature substances ejected from the battery from flowing between the protective layer and the bottom of the battery, further improving the safety performance of the battery pack.

[0025] In this embodiment, when the depth of the mounting step 22 is greater than the thickness of the protective sheet 30, there is a gap between the protective sheet and the battery, which will be completely filled by structural adhesive.

[0026] In other embodiments, the depth of the mounting step 22 may be less than the thickness of the protective sheet 30, in which case the protective sheet 30 protrudes from the heat exchange plate 20, and the portion of the protective sheet 30 protruding from the heat exchange plate 20 is embedded in the structural adhesive 40.

[0027] It should be noted that the relationship between the depth of the installation step 22 and the thickness of the protective sheet 30 is determined by the battery system and capacity, etc.

[0028] Since both structural adhesive 40 and protective sheet 30 provide protection, the greater the impact force and the longer the impact time, the greater the required thickness of both structural adhesive 40 and protective sheet 30. If the thickness of protective sheet 30 remains unchanged, the depth of installation step 22 needs to be increased, thereby increasing the thickness of structural adhesive 40. In other words, the greater the impact force and the longer the impact time, the greater the difference between the depth of installation step 22 and the thickness of protective sheet 30.

[0029] In this embodiment, the battery pack includes multiple batteries, each equipped with an explosion-proof valve 10. The heat exchange plate 20 has multiple openings 21, each corresponding to one of the explosion-proof valves 10, and each opening 21 is fitted with a protective plate 30. The explosion-proof valves 10 for each battery within the battery pack provide independent protection, ensuring effective isolation and protection for each battery in the event of thermal runaway. The risk of thermal runaway within the battery pack is minimized; even if a single battery fails, the failure will not rapidly spread to other batteries, significantly improving the overall safety and lifespan of the battery pack.

[0030] In other embodiments, the battery pack includes multiple battery rows, each battery row includes multiple batteries, each battery is equipped with an explosion-proof valve 10, and the heat exchange plate 20 has multiple openings 21. Multiple explosion-proof valves 10 of a battery row are positioned corresponding to the same opening 21, and a protective plate 30 is provided at each opening 21. With this structure, the opening 21 is simpler and easier to manufacture. Furthermore, multiple explosion-proof valves 10 at the same opening 21 are protected by a single protective plate 30, which simplifies the structure and reduces costs. The opening 21 can be an elongated structure.

[0031] In other words, by setting multiple explosion-proof valves 10 corresponding to the same opening 21 in a battery pack, uniform and effective protection is provided for the entire battery pack, reducing the amount of materials used and lowering costs. The protection efficiency of the battery pack is improved, and the structure is more compact, which is conducive to increasing the energy density of the battery pack.

[0032] The area of ​​the protective plate 30 is S1, and the area of ​​the explosion-proof valve 10 is S2, where 0.1 ≤ S2 / S1 ≤ 1. The selection of the area of ​​the protective plate 30 is based on the requirement of full coverage of the explosion-proof valve 10 and consideration of the overall layout of the battery pack. By setting the coverage area of ​​the protective plate 30, effective protection of the explosion-proof valve 10 can be ensured while avoiding excessive use of materials, thus optimizing the area of ​​the protective plate 30, improving protection efficiency, and reducing costs.

[0033] Specifically, S2 / S1 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, and other values ​​between 0.1 and 1.

[0034] In this design, the area of ​​the protective sheet 30 is S1, and the area of ​​the opening 21 is S3, where 0.1 ≤ S3 / S1 ≤ 1. The area ratio of the protective sheet 30 to the opening 21 is set based on a comprehensive consideration of the blocking effect on high-temperature substances and the heat dissipation performance of the battery pack. By determining the most suitable area ratio, high-temperature substances can be effectively blocked without excessively affecting the heat dissipation efficiency of the battery pack. This achieves the optimal match between the protective sheet 30 and the opening 21 of the heat exchange plate 20, thereby improving the thermal safety and heat dissipation performance of the battery pack.

[0035] Specifically, S3 / S1 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, and other values ​​between 0.1 and 1.

[0036] The units of the area S1 of the protective plate 30, the area S2 of the explosion-proof valve 10, and the area S3 of the opening 21 are all the same.

[0037] In this embodiment, the area of ​​the protective plate 30 is larger than the area of ​​the explosion-proof valve 10 and the area of ​​the opening 21.

[0038] In this embodiment, the explosion-proof valve 10 is located at the bottom of the battery. In other embodiments, the explosion-proof valve 10 can be located at the top or side of the battery. In these embodiments, the explosion-proof valve 10 and the terminal are not on the same surface of the battery; for example, the explosion-proof valve 10 is located at the bottom of the battery, and the terminal is located at the top.

[0039] It should be noted that the protective sheet 30 includes mica board, mica cloth, ceramic composite tape, or epoxy resin board. The ceramic composite tape has a fiberglass cloth as its base material and a composite material consisting of silicone, ceramic filler, and flame-retardant filler. The ceramic filler is primarily silicate, and the flame-retardant filler is primarily aluminum hydroxide.

[0040] Another embodiment of this utility model provides an electrical device, which includes a battery pack, the battery pack being the one provided above.

[0041] Therefore, the electrical device can also protect the explosion-proof valve 10 using the protective plate 30. Furthermore, the heat exchange plate 20 can limit the assembly of the protective plate 30, preventing it from being lifted. This solves the problem in related technologies where the mica plate is lifted, leading to the risk of the thinned areas of the mica plates in other batteries being punctured, thus rendering the mica plate unable to protect the explosion-proof valve.

[0042] Electrical devices include, but are not limited to, vehicles.

[0043] The apparatus provided by the embodiments has the following beneficial effects: (1) The heat exchange plate 20 can limit the assembly of the protective plate 30 to prevent the protective plate 30 from being lifted. The mounting step 22 can better fix the protective plate 30, so that it is not easily washed away or overturned by high temperature substances when the battery is thermally runaway, thereby ensuring the protective effect, improving the stability of the protective plate 30, and further enhancing the protection of the battery explosion-proof valve 10.

[0044] (2) By adjusting the depth of the mounting step 22, the protective plate 30 can be embedded therein, thereby preventing the protective plate 30 from being lifted or moved by high-temperature substances during battery thermal runaway, thus improving the stability of the protective plate 30. The connection between the protective plate 30 and the heat exchange plate 20 is more solid, and it can maintain its position even under extreme conditions, effectively blocking the direct impact of high-temperature substances on the explosion-proof valve 10.

[0045] (3) The structural adhesive 40 can fill the gap between the battery and the heat exchange plate 20, the explosion-proof valve 10 and the protective plate 30, improve the sealing of the battery pack and the stability of the overall structure. The structure of the battery pack is more robust and can effectively resist external impacts. At the same time, the sealing effect of the structural adhesive 40 also prevents the high-temperature substances ejected from the battery from flowing between the protective layer and the bottom of the battery, further improving the safety performance of the battery pack.

[0046] The battery in this application is a secondary battery, also known as a rechargeable battery or storage battery, which refers to a battery that can be used again after being discharged by recharging to activate the active materials.

[0047] Typically, a secondary battery includes an electrode assembly, an electrolyte, and an outer casing. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrode assembly and electrolyte are assembled inside the outer casing. During charging and discharging, active ions (such as lithium ions) move back and forth between the positive and negative electrodes, inserting and extracting. The separator, positioned between the positive and negative electrodes, primarily prevents short circuits while allowing active ions to pass through. The electrolyte, located between the positive and negative electrodes, mainly serves to conduct active ions.

[0048] As an example, the preparation process of a secondary battery is as follows: the positive electrode, separator, and negative electrode are stacked in sequence, with the separator acting as a separator between the positive and negative electrodes. Then, the electrodes are wound or stacked to obtain an electrode assembly. The electrode assembly is placed in an outer packaging shell, dried, and then injected with electrolyte. After vacuum sealing, settling, formation, and shaping, a secondary battery is obtained.

[0049] A positive electrode typically includes a positive current collector and a positive electrode film layer disposed on at least one side of the positive current collector. The positive electrode film layer includes a positive electrode active material, which can be any existing publicly disclosed positive electrode active material or a positive electrode active material optimized based on existing materials.

[0050] This application does not impose any particular restrictions on the type of positive electrode active material for the positive electrode sheet. As an example, the positive electrode active materials in this application include lithium-containing transition metal oxides (e.g., LiCoO2), phosphides (e.g., LiFePO4), or lithium intercalation compounds (e.g., positive electrode materials for binary lithium batteries such as lithium cobalt oxide and lithium nickel oxide, or positive electrode materials for ternary lithium batteries such as lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide).

[0051] In some embodiments, the positive electrode sheet can be prepared by dispersing the above-mentioned components for preparing the positive electrode sheet, such as positive electrode active material, conductive agent, binder and any other components, in a solvent (e.g., N-methylpyrrolidone) to form a positive electrode slurry; coating the positive electrode slurry onto the positive electrode current collector, and then obtaining the positive electrode sheet after drying, rolling, cutting and other processes.

[0052] In this application, the binder is used to improve the adhesion between positive electrode active material particles and the adhesion between the positive electrode active material and the current collector. This application does not impose any particular limitation on the type of binder for the positive electrode sheet; the binder can be any conventional choice in the battery industry. Specifically, the binder can be at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyvinyl alcohol (PVA), styrene-butadiene rubber (SBR), polyacrylonitrile (PAN), polyimide (PI), polyacrylic acid (PAA), polyacrylate, polyolefin, sodium carboxymethyl cellulose (CMC), or sodium alginate.

[0053] This application does not impose any particular restrictions on the positive electrode current collector, as long as it is conductive and will not cause adverse chemical changes in the battery, and can be made of, for example: stainless steel, aluminum, nickel, titanium, sintered carbon; or aluminum or stainless steel that has been surface treated with one of carbon, nickel, titanium, silver, etc.

[0054] The negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on at least one side of the negative electrode current collector. The negative electrode active material layer comprises a silicon-based material. This application does not specifically limit the type of silicon-based material; the silicon-based material can be a silicon-carbon material and / or a silicon-oxygen material. As an example, the silicon-based material can be one or more of silicon-carbon composite negative electrode materials, silicon suboxide negative electrode materials, modified silicon suboxide negative electrode materials, and nano-silicon materials. The negative electrode active material in the negative electrode active material layer may also optionally include one or more of artificial graphite, natural graphite, and hard carbon.

[0055] In some embodiments, the negative electrode sheet can be prepared by dispersing the components used to prepare the negative electrode sheet, such as the negative electrode active material, conductive agent, binder and any other components, in a solvent (e.g., water) to form a negative electrode slurry; coating the negative electrode slurry onto the negative electrode current collector, and then obtaining the negative electrode sheet after drying, rolling, cutting and other processes.

[0056] This application does not specifically limit the type of negative electrode conductive agent. In some embodiments, as an example, the negative electrode conductive agent can be one or more of conventional negative electrode conductive agents such as acetylene black and carbon nanotubes. This application does not impose specific restrictions on the type of negative electrode binder. In some embodiments, as an example, the binder may be one or more of conventional negative electrode binders such as styrene-butadiene rubber latex (SBR), polyvinylidene fluoride (PVDF), polyacrylic acid (PAA), and sodium carboxymethyl cellulose (CMC). In this application, the binder is preferably PAA, SBR, and CMC, and the mass ratio of PAA, SBR, and CMC may be (34.38-74.29):(20-59.38):(5-7.14).

[0057] This application does not impose specific limitations on the type of negative electrode current collector. In some embodiments, as an example, the negative electrode current collector can be one of the conventional negative electrode current collectors such as copper foil.

[0058] The electrolyte acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. As an example, the electrolyte in this application can be any electrolyte suitable for electrochemical energy storage devices in the art. The electrolyte includes an electrolyte and a solvent; the electrolyte typically includes a lithium salt, and additives may also be added to the electrolyte.

[0059] Specifically, the lithium salt includes at least one selected from lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluorooxalate borate (LiDFOB), lithium dioxalate borate (LiBOB), lithium difluorophosphate (LiPO2F2), lithium difluorodioxalate phosphate (LiDFOP), and lithium tetrafluorooxalate phosphate (LiTFOP). The concentration of the electrolyte in the electrolyte solution can be 0.5–5 mol / L.

[0060] Specifically, the solvent includes at least one of ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butyl carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), and diethyl sulfone (ESE).

[0061] In some implementations, as an example, the additive may be a conventional electrolyte additive such as fluoroethylene carbonate (FEC), chloroethylene carbonate (CEC), or vinylene carbonate (VC).

[0062] In some embodiments, the secondary battery also includes a separator. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.

[0063] In some embodiments, as an example, the diaphragm can be one of PP, PE, or PP / PF; the diaphragm can also be a structure in which a coating is formed on the surface of the base film, wherein the base film coating can be one of PP, PE, or PP / PF, and the coating can be an inorganic coating and / or an organic coating. The inorganic coating can be selected from alumina ceramic layers, osmium silicate, etc., and the organic coating can be selected from PVDF, etc.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0066] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0067] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0068] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0069] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized by, The battery pack includes: Battery; An explosion-proof valve (10) is disposed on the battery; A heat exchange plate (20) has an opening (21) corresponding to the explosion-proof valve (10), and the projection of the explosion-proof valve (10) on the heat exchange plate (20) is located in the opening (21); A protective plate (30) is disposed on the heat exchange plate (20) and located on the side of the opening (21) facing the explosion-proof valve (10), and the area of ​​the protective plate (30) is greater than or equal to the area of ​​the opening (21).

2. The battery pack of claim 1, wherein, An installation step (22) is provided on the side of the opening (21) facing the explosion-proof valve (10), and the protective plate (30) is provided on the installation step (22).

3. The battery pack of claim 2, wherein, The depth of the mounting step (22) is greater than or equal to the thickness of the protective sheet (30).

4. The battery pack of claim 2, wherein, The depth of the mounting step (22) is less than the thickness of the protective sheet (30).

5. The battery pack of claim 2, wherein, The thickness of the protective sheet (30) is D, where 0.05mm≤D≤1mm.

6. The battery pack of claim 2, wherein, The depth of the installation step (22) is H, 0.05mm≤H≤4mm.

7. The battery pack of any one of claims 1-6, wherein, The battery pack also includes structural adhesive (40), which is used to fill the space between the battery and the heat exchange plate (20), between the explosion-proof valve (10) and the protective sheet (30), and between the battery and the protective sheet (30).

8. The battery pack of any one of claims 1-6, wherein, The battery pack includes a plurality of batteries, each of which is provided with an explosion-proof valve (10). The heat exchange plate (20) has a plurality of openings (21), each of which is provided with an explosion-proof valve (10) in a one-to-one correspondence. Each of the openings (21) is provided with a protective plate (30).

9. The battery pack of any one of claims 1-6, wherein, The battery pack includes multiple battery columns, each battery column includes multiple batteries, each battery is provided with an explosion-proof valve (10), the heat exchange plate (20) has multiple openings (21), multiple explosion-proof valves (10) of a battery column are provided with the same opening (21), and each opening (21) is provided with a protective plate (30).

10. The battery pack of any one of claims 1-6, wherein, The area of ​​the protective plate (30) is S1, and the area of ​​the explosion-proof valve (10) is S2, 0.1≤S2 / S1≤1.

11. The battery pack of any one of claims 1-6, wherein, The area of ​​the protective sheet (30) is S1, and the area of ​​the opening (21) is S3, 0.1≤S3 / S1≤1.

12. The battery pack of any one of claims 1-6, wherein, The protective sheet (30) includes mica board, mica cloth, ceramic composite tape, or epoxy resin board.

13. An electrical device, comprising: The electrical device includes a battery pack, which is the battery pack according to any one of claims 1 to 12.

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