Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment, and relates to the technical field of new energy batteries. The battery pack provided by the invention comprises a box body, wherein the box body is provided with an opening and an accommodating cavity communicated with the opening; the box cover covers the opening and is fixedly connected with the box body; the battery cell pile comprises a plurality of battery cell monomers which are arranged in multiple rows and multiple columns, and the plurality of battery cell monomers are fixedly arranged in the accommodating cavity; and the crimping parts are abutted between the battery cell monomers and the box cover, the plurality of crimping parts are arranged at intervals along the width direction of the plurality of battery cell monomers, and each crimping part extends along the thickness direction of the battery cell monomers so as to be pressed on the plurality of columns of battery cell monomers. According to the battery pack provided by the invention, the supporting structure is arranged between the battery cell stack and the box cover, so that the anti-treading capability of the battery pack is enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of new energy batteries, and in particular to a battery pack and electrical equipment. Background Art

[0002] The battery integration technologies in the new energy industry include Cell to Battery Pack (CTB) and Cell to Chassis (CTC). Under this technology, the cover of the battery pack is used as the floor of the vehicle body, which has outstanding integration advantages.

[0003] However, with the gradual implementation of CTB and CTC solutions, people have found that this battery technology poses a safety hazard to the vehicle. Specifically, the current battery pack cover structure is not strong enough and has low anti-trampling ability. Summary of the invention

[0004] The present application provides a battery pack and an electrical device, wherein a support structure is provided between the battery cell stack and the box cover in the battery pack, thereby enhancing the anti-trampling capability of the battery pack.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A first aspect of the present application provides a battery pack, comprising: a box body having an opening and a receiving cavity connected to the opening;

[0007] A box cover, which is disposed on the opening and fixedly connected to the box body;

[0008] A battery cell stack, comprising a plurality of battery cells arranged in a plurality of rows and columns, wherein the plurality of battery cells are fixedly disposed in the accommodation cavity;

[0009] The crimping parts are abutted between the battery cell and the box cover. The crimping parts are arranged at intervals along the width direction of the battery cell, and each crimping part extends along the thickness direction of the battery cell to press on the multiple rows of battery cell.

[0010] In a possible implementation, along the width direction of the battery cell, at least one of the crimping members presses on the battery cell in two adjacent columns, and along the height direction of the battery cell, the orthographic projection of the crimping member covers the orthographic projection of the side edges of the battery cell in the two adjacent columns;

[0011] And / or, a pressure relief valve is provided on the battery cell, and at least two crimping parts are respectively arranged on opposite sides of the pressure relief valve along the width direction of the battery cell.

[0012] In a possible implementation, the crimping member includes a pressure strip and a flexible pad, the flexible pad is fixedly connected to the pressure strip, and the flexible pad abuts between the pressure strip and the battery cell, and the pressure strip abuts against the box cover.

[0013] In a possible implementation, the crimping component further includes a buffer pad, and the buffer pad is fixed between the pressure strip and the box cover.

[0014] In a possible implementation, the box cover includes a cover plate and a fireproof plate that are fixedly connected, the fireproof plate is pressed against the crimping piece, and the material of the fireproof plate includes mica.

[0015] In a possible implementation, the box cover further includes an insulating plate, which is fixed between the cover plate and the fireproof plate, and the thermal conductivity of the insulating plate is less than or equal to 0.3 W / mk.

[0016] In a possible implementation, the box cover further includes a thermal insulation pad, whose thermal conductivity is less than or equal to 0.04 W / mk, and the thermal insulation pad is fixed between the insulating plate and the cover plate, and along the height direction of the battery cell, the orthographic projection of the thermal insulation pad coincides with the orthographic projections of the two crimping parts on both sides of the pressure relief valve;

[0017] And / or, the box cover comprises at least two support bars, the two support bars are fixed between the insulating plate and the cover plate, and along the height direction of the battery cell, the two support bars are respectively opposite to the crimping pieces pressed on two adjacent battery cell units.

[0018] In a possible implementation, it also includes a bus, a low-voltage collection piece and an elastic pad, the bus is arranged between the battery cell and the box cover, and the bus is electrically connected to the battery cell, the low-voltage collection piece is fixed to the bus through the elastic pad, and the low-voltage collection piece is electrically connected to the bus.

[0019] In a possible implementation, a protective sheet is further included, which is bonded to the low-voltage collection member, and along the height direction of the battery cell, the orthographic projection of the protective sheet covers the low-voltage collection member and the busbar.

[0020] The battery pack provided in the first aspect of the present application includes at least the following beneficial effects:

[0021] By arranging multiple crimping parts at intervals between the battery cells of the battery stack and the box cover, and the crimping parts extending along the thickness direction of the battery cells, sufficient support is provided for the box cover from the side of the battery stack, thereby improving the ability of the box cover to resist being stepped on from the side away from the battery stack, thereby improving the overall structural strength of the battery pack and meeting the structural requirements of the box cover as the bottom plate of the vehicle body.

[0022] A second aspect of the present application provides an electrical device, comprising a battery pack provided by any of the above technical solutions.

[0023] The electrical equipment provided in the second aspect of the present application has all the beneficial effects of the battery pack provided in the first aspect of the present application, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 An exploded view of a battery pack provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the assembled box cover and box body provided in an embodiment of the present application;

[0027] Figure 3 To show Figure 2 Schematic diagram of the surrounding structure of the medium pressure relief valve;

[0028] Figure 4 Figure 1 Exploded view of the crimping parts in ;

[0029] Figure 5 for Figure 1 The exploded structure diagram of the box cover in Figure 1;

[0030] Figure 6 To show Figure 1 Exploded diagram of the low voltage collection components and busbars.

[0031] Description of reference numerals:

[0032] 100, box body;

[0033] 110. Accommodating chamber;

[0034] 200, box cover;

[0035] 210, cover plate;

[0036] 220, fireproof board;

[0037] 230, insulation board;

[0038] 240, thermal insulation pad;

[0039] 250, support bar;

[0040] 300. Battery cell stack;

[0041] 310, battery cell monomer;

[0042] 400, crimping parts;

[0043] 410, layering;

[0044] 420, flexible pad;

[0045] 430, cushion;

[0046] 500, pressure relief valve;

[0047] 600, bus;

[0048] 700, low voltage collection parts;

[0049] 800, elastic pad;

[0050] 900. Protective sheet.

[0051] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0052] As described in the background technology, the battery integration technology in the new energy industry includes cell to battery pack (CTB) and cell to chassis (CTC). Under this technology, the cover of the battery pack is used as the floor of the vehicle body, which has outstanding integration advantages.

[0053] However, with the gradual implementation of CTB and CTC solutions, people have found that this battery technology poses a safety hazard to the vehicle. Specifically, the current battery pack cover structure is not strong enough and has low anti-trampling ability. The inventors have found that the main reason for this problem is that there is a lack of support structure between the battery cell stack and the cover in the battery pack.

[0054] In addition, when thermal runaway occurs in the battery cells of the battery pack, the existing box cover can easily rise to a high temperature or even burn through, threatening the personal safety of people in the vehicle.

[0055] In response to the above technical problems, the embodiments of the present application provide a battery pack and an electrical device, by setting a plurality of crimping parts between the battery cells of the battery stack and the box cover, and the crimping parts extend along the thickness direction of the battery cells, thereby providing sufficient support for the box cover from the side of the battery stack, improving the ability of the box cover to resist being stepped on from the side away from the battery stack, thereby improving the overall structural strength of the battery pack and meeting the structural requirements of the box cover as the bottom plate of the vehicle body.

[0056] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 making creative work belong to the scope of protection of this application.

[0057] refer to Figures 1 to 6 The battery pack provided in the embodiment of the present application includes: a box body 100, having an opening and a accommodating cavity 110 connected to the opening; a box cover 200, which is covered on the opening and fixedly connected to the box body 100; a battery cell stack 300, including a plurality of battery cell units 310 arranged in a plurality of rows and columns, and the plurality of battery cell units 310 are fixedly arranged in the accommodating cavity 110; a crimping piece 400, which abuts between the battery cell units 310 and the box cover 200, and along the width direction of the plurality of battery cell units 310, the plurality of crimping pieces 400 are arranged at intervals, and each crimping piece 400 extends along the thickness direction of the battery cell units 310 to press on the plurality of columns of battery cell units 310.

[0058] In this way, by arranging a plurality of crimping parts 400 at intervals between the battery cells 310 of the battery stack 300 and the box cover 200, and the crimping parts 400 extending along the thickness direction of the battery cells 310, sufficient support is provided for the box cover 200 from the side of the battery stack 300, thereby improving the ability of the box cover 200 to resist being stepped on from the side away from the battery stack 300, thereby improving the overall structural strength of the battery pack and satisfying the structural requirements of the box cover 200 as the bottom plate of the vehicle body.

[0059] In some embodiments, along the width direction of the battery cell 310, at least one crimping component 400 is pressed on two adjacent columns of battery cell 310, and along the height direction of the battery cell 310, the orthographic projection of the crimping component 400 covers the orthographic projection of the side edges of the battery cell 310 in two adjacent columns; and / or, a pressure relief valve 500 is provided on the battery cell 310, and along the width direction of the battery cell 310, at least two crimping components 400 are respectively arranged on opposite sides of the pressure relief valve 500.

[0060] In this way, by arranging crimping parts 400 on both sides of the pressure relief valve 500 on the battery cells 310 of the battery stack 300, and between two adjacent rows of battery cells 310 (the shoulders of the battery cells 310), the box cover 200 can obtain more support from one side of the battery stack 300, which significantly improves the ability of the box cover 200 to resist stepping away from the side of the battery stack 300; at the same time, the coordinated use of multiple crimping parts 400 and the box cover 200 also weakens the insulation damage to the battery pack caused by turbulent gas and ejecta after thermal runaway, further reducing the risk of secondary thermal runaway caused by insulation damage.

[0061] That is, the pressure relief valve 500 and the bus bar 600 area of ​​the battery cell 310 are separated by the crimping member 400 to prevent the ejected matter of the pressure relief valve 500 from directly damaging the bus bar 600 area.

[0062] Exemplarily, the battery stack 300 includes six columns of battery cells 310 , and each column has multiple battery cells 310 . Five crimping pieces 400 are respectively crimped between every two adjacent columns of battery cells 310 , that is, each crimping piece 400 is pressed onto the shoulder of the battery cell 310 .

[0063] Moreover, both sides of the pressure relief valve 500 on each row of battery cells 310 are provided with crimping parts 400 , which provide strong support for the box cover 200 .

[0064] In some embodiments, the crimping member 400 includes a pressure strip 410 and a flexible pad 420 . The flexible pad 420 is fixedly connected to the pressure strip 410 , and the flexible pad 420 abuts between the pressure strip 410 and the battery cell 310 . The pressure strip 410 abuts against the box cover 200 .

[0065] Exemplarily, the flexible pad 420 is an elastic rubber pad having certain compression performance, and its hardness range may be from Shore A10 to Shore A95. The material of the flexible pad 420 may be a structural adhesive or a rubber sheet having certain compression capacity.

[0066] In this way, the crimping piece 400 can fit perfectly with the battery cell stack 300 while ensuring that the battery cell stack 300 will not be subjected to excessive pressure. The pressure strip 410 has insulating properties and its material can be a composite material or a plastic part, mainly serving as a load-bearing part.

[0067] In some embodiments, the crimping component 400 also includes a buffer pad 430, which is fixed between the pressure strip 410 and the box cover 200. The buffer pad 430 is located on the upper part of the crimping component 400 and is used for buffering between the crimping component 400 and the box cover 200, and also ensures a close fit between the crimping component 400 and the box cover 200.

[0068] In some embodiments, the box cover 200 includes a cover plate 210 and a fireproof plate 220 that are fixedly connected. The fireproof plate 220 is pressed against the crimping piece 400. The material of the fireproof plate 220 includes mica. Along the height direction of the battery cell 310, the orthographic projection of the fireproof plate 220 covers the orthographic projection of the battery cell stack 300, that is, the fireproof plate 220 covers the entire area of ​​the battery cell stack 300.

[0069] Among them, the fireproof board 220 has insulating and fire-resistant properties. Exemplarily, the fireproof board 220 is a mica board, or other composite materials containing mica. The fireproof board 220 is located at the bottom layer of the box cover 200 and is directly pressed against the crimping piece 400.

[0070] In some embodiments, the box cover 200 also includes an insulating plate 230, which is fixed between the cover plate 210 and the fireproof plate 220. Specifically, the insulating plate 230 is bonded to the fireproof plate 220, and the thermal conductivity of the insulating plate 230 is less than or equal to 0.3W / mk. For example, the thermal conductivity of the insulating plate 230 is 0.2W / mk.

[0071] The provision of the insulating plate 230 further strengthens the structural strength of the fireproof plate 220 and plays a role of heat insulation, thereby preventing the ejected material of the pressure relief valve 500 from breaking through the fireproof plate 220 .

[0072] In this way, the multi-layer design of the box cover 200 significantly reduces the thermal impact of the hot air flow generated when the battery cell 310 thermally runs away on the box cover 200, avoiding the risk of the box cover 200 being burned through or punctured.

[0073] In some embodiments, the box cover 200 also includes a thermal insulation pad 240, whose thermal conductivity is less than or equal to 0.04W / mk. For example, the thermal conductivity of the thermal insulation pad 240 is 0.04W / mk, and the thermal insulation pad 240 is fixed between the insulating plate 230 and the cover plate 210. Along the height direction of the battery cell 310, the orthographic projection of the thermal insulation pad 240 coincides with the orthographic projection of the two crimping parts 400 on both sides of the pressure relief valve 500, that is, the thermal insulation pad 240 is opposite to the above-mentioned two crimping parts 400.

[0074] Furthermore, the thermal insulation pad 240 is an aerogel pad. Exemplarily, the thermal insulation pad 240 in this embodiment has a compression amount of ≤30% under a pressure of 2 MPa, and has a good supporting effect.

[0075] In more examples, the box cover 200 includes at least two support bars 250 , and the two support bars 250 are fixed between the insulation plate 230 and the cover plate 210 .

[0076] For example, the support bar 250 is pasted between the insulating plate 230 and the cover plate 210. Along the height direction of the battery cell 310, the two support bars 250 are respectively opposite to the crimping pieces 400 pressed on two adjacent battery cell units 310. The support bar 250 has insulating properties. The material of the support bar 250 can be structural adhesive, plastic parts or composite materials. The support bar 250 is pressed on the crimping piece 400 on the shoulder of the battery cell 310.

[0077] In this way, a multi-layer insulation and fireproof structure design is adopted for the box cover 200 , and the structural stability of the box cover 200 itself is ensured by a plurality of support bars 250 .

[0078] That is to say, the cooperation of the multi-layer structure of the box cover 200 and the crimping piece 400 divides the upper part of the battery stack into multiple insulating and fireproof areas, and makes the top of the battery pack have a strong anti-trampling ability.

[0079] In some embodiments, a busbar 600, a low-voltage collection component 700 and an elastic pad 800 are also included. The busbar 600 is arranged between the battery cell 310 and the box cover 200, and the busbar 600 is electrically connected to the battery cell 310. The low-voltage collection component 700 is fixed to the busbar 600 through the elastic pad 800, and the low-voltage collection component 700 is electrically connected to the busbar 600. The elastic pad 800 is made of insulating material.

[0080] Specifically, the low voltage collection component 700 includes a circuit board and a connector and a sensor connected to the circuit board. Furthermore, a nickel sheet is connected to the circuit board for welding with the bus bar 600 to achieve circuit connection between the low voltage collection component 700 and the battery cell 310.

[0081] Specifically, the busbar 600 is located above the battery cell pole and is welded to the battery cell pole. One busbar 600 can realize the series connection of a column of battery cells 310. The busbar 600 can be a low-resistance path for the battery cells 310 so that current flows between the battery cells.

[0082] In this way, the reliability of the low-voltage collection component 700 is ensured by the elastic pad 800 and the protective sheet. Specifically, by providing the elastic pad 800 with insulating and stretchable rebound properties, not only can the low-voltage collection component 700 and the bus 600 be insulated, but the stretching and rebound properties of the elastic pad 800 can also prevent damage to the low-voltage collection component 700 when the battery cell expands due to breathing.

[0083] In some embodiments, a protective sheet is further included, which is bonded to the low voltage collection member 700. Along the height direction of the battery cell 310, the orthographic projection of the protective sheet covers the low voltage collection member 700 and the bus 600. Furthermore, the protective sheet is made of insulating and fireproof material.

[0084] Exemplarily, the material of the protection sheet is polyimide or fiberglass reinforced plastic (FRP), which can protect the low-voltage collection member 700 and the busbar 600 .

[0085] In the second aspect, an embodiment of the present application provides an electrical device, which includes a battery pack provided by any embodiment of the first aspect. Exemplarily, the electrical device can be an electric vehicle / equipment (Electric Vehicle, referred to as EV), a pure electric vehicle equipment (Pure Electric Vehicle / Battery Electric Vehicle, referred to as PEV / BEV), a hybrid electric vehicle (Hybrid Electric Vehicle, referred to as HEV), an extended-range device (Range Extended Electric Vehicle, referred to as REEV), a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, referred to as PHEV), and a new energy vehicle (New Energy Vehicle).

[0086] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0088] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0089] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0090] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0091] It should be noted that the embodiments represented by "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A box body (100) having an opening and a receiving cavity (110) connected to the opening; A box cover (200), which is disposed on the opening and is fixedly connected to the box body (100); A battery cell stack (300) comprises a plurality of battery cell units (310) arranged in a plurality of rows and columns, wherein the plurality of battery cell units (310) are fixedly disposed in the accommodation cavity (110); The crimping piece (400) is abutted between the battery cell (310) and the box cover (200). The crimping pieces (400) are arranged at intervals along the width direction of the plurality of battery cell units (310), and each crimping piece (400) extends along the thickness direction of the battery cell unit (310) to press on the plurality of rows of battery cell units (310).

2. The battery pack according to claim 1, characterized in that: Along the width direction of the battery cell monomer (310), at least one of the crimping pieces (400) is pressed on the battery cell monomers (310) in two adjacent columns, and along the height direction of the battery cell monomer (310), the orthographic projection of the crimping piece (400) covers the orthographic projection of the side edges of the battery cell monomers (310) in the two adjacent columns; And / or, a pressure relief valve (500) is provided on the battery cell (310), and along the width direction of the battery cell (310), at least two crimping parts (400) are respectively arranged on opposite sides of the pressure relief valve (500).

3. The battery pack according to claim 1 or 2, characterized in that: The crimping piece (400) comprises a pressure strip (410) and a flexible pad (420), wherein the flexible pad (420) is fixedly connected to the pressure strip (410), and the flexible pad (420) abuts between the pressure strip (410) and the battery cell (310), and the pressure strip (410) abuts against the box cover (200).

4. The battery pack according to claim 3, characterized in that: The crimping component (400) further comprises a buffer pad (430), wherein the buffer pad (430) is fixed between the pressure strip (410) and the box cover (200).

5. The battery pack according to claim 2, characterized in that: The box cover (200) comprises a cover plate (210) and a fireproof plate (220) which are fixedly connected, the fireproof plate (220) is pressed against the crimping piece (400), and the material of the fireproof plate (220) comprises mica.

6. The battery pack according to claim 5, characterized in that: The box cover (200) further comprises an insulating plate (230), wherein the insulating plate (230) is fixed between the cover plate (210) and the fireproof plate (220), and the thermal conductivity of the insulating plate (230) is less than or equal to 0.3 W / mk.

7. The battery pack according to claim 6, characterized in that: The box cover (200) further comprises a heat insulating pad (240) having a thermal conductivity less than or equal to 0.04 W / mk, the heat insulating pad (240) being fixed between the insulating plate (230) and the cover plate (210), and along the height direction of the battery cell (310), the orthographic projection of the heat insulating pad (240) coincides with the orthographic projections of the two crimping parts (400) on both sides of the pressure relief valve (500); And / or, the box cover (200) comprises at least two support bars (250), the two support bars (250) being fixed between the insulating plate (230) and the cover plate (210), and along the height direction of the battery cell monomer (310), the two support bars (250) are respectively opposite to the crimping pieces (400) pressed on two adjacent battery cell monomers (310).

8. The battery pack according to claim 1 or 2, characterized in that: The invention also comprises a busbar (600), a low-voltage collection piece (700) and an elastic pad (800); the busbar (600) is arranged between the battery cell (310) and the box cover (200), and the busbar (600) is electrically connected to the battery cell (310); the low-voltage collection piece (700) is fixed to the busbar (600) via the elastic pad (800), and the low-voltage collection piece (700) is electrically connected to the busbar (600).

9. The battery pack according to claim 8, characterized in that: It also comprises a protective sheet which is bonded to the low voltage collection piece (700), and along the height direction of the battery cell (310), the orthographic projection of the protective sheet covers the low voltage collection piece (700) and the busbar (600).

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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