Battery pack

Abstract

The utility model relates to the technical field of battery energy, in particular to a battery pack. The battery pack comprises a shell which comprises a first cover body and a shell body, the shell body is provided with an accommodating cavity, and the first cover body covers the shell body and is fixedly connected with the shell body; the battery pack is arranged in the accommodating cavity; the protection plate is fixedly mounted on one side, facing the battery pack, of the first cover body; the supporting plate assembly is located between the battery pack and the protection plate, the supporting plate assembly comprises a supporting plate, a first buffer layer and a second buffer layer, the first buffer layer and the second buffer layer are arranged on the two surfaces of the supporting plate respectively, the first buffer layer abuts against the end, facing the first cover body, of the battery pack, and the second buffer layer abuts against the first cover body. Under the condition that a support is not used, isolation between the protection plate and the battery pack and fixing of the battery pack in the shell are achieved, the mold opening cost of the support is saved, and then the total cost of the battery pack is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery energy technology, and in particular to a battery pack. Background Art

[0002] The battery pack is the power source for the tool, mostly referring to the storage battery that powers electric vehicles. Small battery packs are used to drive small tools and have smaller specifications.

[0003] At present, the battery pack includes a shell, a battery pack and a protection board. The battery pack and the protection board are both arranged inside the shell and the battery pack is electrically connected to the protection board. The protection board can ensure the safety, high efficiency and long-term stable operation of the battery pack. A bracket is arranged between the protection board and the battery pack, which can play the role of isolation and support to prevent the protection board from affecting the battery pack.

[0004] However, the mold opening cost of the bracket is high, resulting in a higher overall cost of the battery pack. Utility Model Content

[0005] Based on this, the present application provides a battery pack to solve the problem of high total cost of battery packs in related technologies.

[0006] The battery pack provided in this application includes:

[0007] The housing comprises a first cover and a shell, wherein the shell has a receiving cavity, and the first cover is disposed on the shell and fixedly connected to the shell;

[0008] A battery pack is arranged inside the accommodating cavity;

[0009] A protection plate, fixedly mounted on a side of the first cover body facing the battery pack;

[0010] The support plate assembly is located between the battery pack and the protective plate. The support plate assembly includes a support plate, a first buffer layer and a second buffer layer. The first buffer layer and the second buffer layer are respectively arranged on two surfaces of the support plate. The first buffer layer abuts against one end of the battery pack facing the first cover body, and the second buffer layer abuts against the first cover body.

[0011] In a possible implementation, the battery pack includes a plurality of battery cells and a collection board, the plurality of battery cells are stacked, the collection board is installed on one side of the plurality of battery cells facing the first cover, and the tabs of the battery cells are electrically connected to the collection board;

[0012] A supporting foam is arranged between the pole ears of two adjacent battery cells, and the supporting foam is configured to support the pole ears of the battery cells and the collecting arms of the collecting plate. The pole ears of each battery cell and the collecting arms of the collecting plate are respectively against the first buffer layer.

[0013] In a possible implementation, a hole is opened on the support plate, and a cable connected between the collection plate and the protection plate is arranged through the hole. The number of the first buffer layers is two, and the two first buffer layers are respectively located on both sides of the hole.

[0014] Collection arms are provided on both sides of the collection plate, and the pole ears of multiple battery cells are distributed in two rows. The collection arm on one side of the collection plate and the pole ears of each battery cell in one row are respectively abutted against one of the first buffer layers, and the collection arm on the other side of the collection plate and the pole ears of each battery cell in another row are respectively abutted against the other first buffer layer.

[0015] In a possible implementation, support parts are respectively provided at both ends of the first cover body facing the battery pack, there are two second buffer layers, the two second buffer layers are respectively located on opposite sides of the hole, and the two support parts correspond to and abut against the two second buffer layers one by one.

[0016] In a possible implementation, an adhesive layer is provided on a side of the first buffer layer facing away from the support plate, and the adhesive layer is respectively bonded and fixed to the collection arm of the collection plate and the tabs of each battery cell.

[0017] In a possible implementation, a heat insulating sheet is provided between two adjacent battery cells.

[0018] In a possible implementation, the thermal insulation sheet is an aerogel sheet.

[0019] In a possible implementation, the battery pack further includes a heating film, which is wrapped and attached to the plurality of battery cells, and is electrically connected to the protection plate.

[0020] In a possible implementation, there are multiple heating films, and the multiple heating films are arranged in sequence along the stacking direction of the multiple battery cells; and / or,

[0021] A notch is arranged at the edge of the supporting plate assembly, and the cable connected between the heating film and the protection plate passes through the notch.

[0022] In a possible implementation, a limiting portion is provided on a side of the first cover body facing the battery pack, and the limiting portion extends into the interior of the shell and is fixedly connected to a side wall of the shell.

[0023] In a possible implementation, foam is disposed between the battery pack and the side wall of the shell.

[0024] In a possible implementation, the shell includes a frame body and a second cover body, the first cover body is covered at one end of the frame body and fixedly connected to the frame body, and the second cover body is covered at the other end of the frame body and fixedly connected to the frame body.

[0025] The battery pack provided by the present application, after the battery pack is arranged in the accommodating cavity of the shell, a support plate assembly can be arranged at one end of the battery pack facing the first cover of the shell. The protective plate is fixedly installed on the side of the first cover facing the battery pack, and the support plate assembly is arranged between the protective plate and the battery pack. When the first cover of the shell is covered on the shell and fixedly connected with the shell, the first cover pushes the support plate assembly to achieve the fixation and position limiting of the battery pack in the shell. The support plate assembly includes a support plate and a first buffer layer and a second buffer layer respectively located on the two surfaces of the support plate, the first buffer layer and the end of the battery pack facing the first cover are against each other, and the second buffer layer and the first cover are against each other. The buffering effect of the first buffer layer and the second buffer layer can avoid damage to the battery pack, so that the battery pack can be reliably fixed inside the shell. In addition, the support plate assembly also serves to isolate the protective plate and the battery pack, avoid the heat generated by the protective plate from affecting the battery pack, and avoid the components on the surface of the protective plate from damaging the battery pack. In this way, the isolation between the protective plate and the battery pack and the fixation of the battery pack in the shell are achieved without using a bracket, saving the mold opening cost of the bracket, thereby reducing the total cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. 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.

[0027] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0028] Figure 2 for Figure 1 An exploded view of the battery pack shown;

[0029] Figure 3 A schematic diagram of the structure of the support plate assembly provided in an embodiment of the present application facing the first cover body;

[0030] Figure 4 A schematic diagram of the structure of a support plate assembly facing the battery pack provided in an embodiment of the present application;

[0031] Figure 5 A cross section of a battery pack provided in an embodiment of the present application Figure 1 ;

[0032] Figure 6 A cross section of a battery pack provided in an embodiment of the present application Figure 2 ;

[0033] Figure 7An exploded view of a battery pack provided in an embodiment of the present application;

[0034] Figure 8 A schematic diagram of the structure of the acquisition board provided in the embodiment of the present application;

[0035] Fig. 9 A schematic structural diagram of the first cover body provided in an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 100-housing; 110-first cover; 111-main body; 112-supporting part; 113-limiting part; 114-mounting column; 120-housing; 121-frame; 122-second cover;

[0038] 200-battery pack; 210-battery cell; 220-collection board; 230-insulation sheet; 240-heating film; 251-first foam; 252-second foam; 260-binding tape; 270-supporting foam;

[0039] 300-protection plate;

[0040] 400-support plate assembly; 410-support plate; 411-hole position; 420-first buffer layer; 430-second buffer layer; 440-notch;

[0041] 500-Light Board. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element 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.

[0045] The terms "first", "second" and "third" (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0046] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0047] In the prior art, a bracket is provided between the protection plate and the battery pack. The bracket can play the role of isolation and support to prevent the protection plate from affecting the battery pack, and can also fix the battery pack inside the shell. However, three brackets need to be provided inside the shell, one of which is used to fix the protection plate, and the other two brackets are respectively provided at both ends of the battery pack. Each bracket needs to be manufactured by a mold, and the mold opening cost of the bracket is relatively high, resulting in a high total cost of the battery pack.

[0048] After repeated thinking and verification, the inventor found that if the protective plate is fixed by the cover of the shell, a support plate assembly is set between the battery pack and the protective plate. The battery pack is fixed by the support plate assembly, and the support plate can also isolate the protective plate from the battery pack to prevent the protective plate from affecting the battery pack. The support plate does not require mold manufacturing, which reduces the mold opening cost of the bracket. At the same time, the isolation between the protective plate and the battery pack and the fixation of the battery pack in the shell are achieved, reducing the total cost of the battery pack.

[0049] In view of this, the inventor has designed a battery pack, whose shell includes a first cover body and a shell, and the battery pack is arranged in the accommodating cavity of the shell. The protective plate is installed on the side of the cover body facing the battery pack, and the support plate assembly is arranged between the battery pack and the protective plate. After the first cover body is fixed on the shell, the first cover body and the battery pack are respectively against the two sides of the support plate assembly, and the battery pack is fixed by the support plate assembly. The protective plate assembly includes a support plate and a first buffer layer and a second buffer layer respectively located on the two surfaces of the support plate. The first buffer layer and the second buffer layer can prevent the battery pack from being crushed. The support plate ensures the strength of the support plate assembly, so that the battery pack can be reliably fixed inside the shell. The support plate assembly also serves to isolate the protective plate and the battery pack to prevent the protective plate from affecting the battery pack. The isolation between the protective plate and the battery pack and the fixation of the battery pack in the shell are achieved without using a bracket, which saves the mold opening cost of the bracket, thereby reducing the total cost of the battery pack.

[0050] The technical solution of the battery pack provided in the embodiment of the present application is described in detail below in conjunction with the accompanying drawings.

[0051] Reference Figures 1 to 6 As shown, the battery pack provided in the embodiment of the present application includes a shell 100, a battery pack 200 (Corepack), a protective plate 300 and a support plate assembly 400. The shell 100 includes a first cover 110 and a shell 120, the shell 120 has a receiving cavity, and the first cover 110 is covered on the shell 120 and is fixedly connected to the shell 120. The battery pack 200 is arranged inside the receiving cavity. The protective plate 300 is fixedly mounted on the side of the first cover 110 facing the battery pack 200. The support plate assembly 400 is located between the battery pack 200 and the protective plate 300, and the support plate assembly 400 includes a support plate 410, a first buffer layer 420 and a second buffer layer 430. The first buffer layer 420 and the second buffer layer 430 are respectively arranged on the two surfaces of the support plate 410, the first buffer layer 420 and the end of the battery pack 200 facing the first cover 110 are against each other, and the second buffer layer 430 is against the first cover 110.

[0052] Exemplarily, the housing 100 forms an approximate box structure, and the first cover 110 can be covered on the housing 120 and locked on the housing 120 by fasteners. In a possible implementation, the protection plate 300 can be fixedly installed on the side of the first cover 110 facing the battery pack 200 by fasteners, and when the protection plate 300 is connected to the first cover 110, part of the first cover 110 is located on the outside of the protection plate 300. When the first cover 110 is covered on the housing 120 and fixed to the housing 120, the part of the first cover 110 located on the outside of the protection plate 300 abuts against the support plate assembly 400. It is worth mentioning that when the first cover 110 is covered on the housing 120 and fixed to the housing 120, the end of the battery pack 200 away from the first cover 110 abuts against the housing 120, and the battery pack 200 can be limited by the support plate assembly 400 and the housing 120 to prevent the distance between the battery pack 200 and the first cover 110 from changing.

[0053] The protection board 300 may be electrically connected to the battery pack 200 via a cable, and the protection board 300 may protect the battery pack 200 , such as providing overcharge protection, over-discharge protection, and short circuit protection.

[0054] Exemplarily, the first buffer layer 420 and the second buffer layer 430 can be fixed to the two surfaces on both sides of the support plate 410 by bonding, respectively. Optionally, an acrylic plate can be used as the support plate 410, and foam can be used as the first buffer layer 420 and the second buffer layer 430, respectively. This embodiment does not limit the thickness of the support plate 410, the first buffer layer 420 and the second buffer layer 430, and those skilled in the art can set it as needed. During the manufacturing process of the support plate assembly 400, the support plate 410, the first buffer layer 420 and the second buffer layer 430 can be cut into suitable shapes, and then the support plate 410 can be connected to the first buffer layer 420 and the second buffer layer 430, respectively. The support plate assembly 400 does not need to be manufactured by mold opening, which reduces the cost of mold opening.

[0055] It should be noted that when the support plate assembly 400 is squeezed, the thickness of the first buffer layer 420 and the second buffer layer 430 are compressed, thereby preventing the battery pack 200 from being crushed.

[0056] like Figure 2 As shown, the battery pack further includes a light board 500, which can be installed on the side of the first cover 110 facing the battery pack 200, and the light board 500 can be electrically connected to the protection board 300. Optionally, an observation window is provided at a position of the first cover 110 facing the light board 500, through which the pattern displayed by the light board 500 can be observed to obtain the status of the battery pack.

[0057] In the battery pack provided in the present embodiment, after the battery pack 200 is arranged in the accommodating cavity of the housing 100, a support plate assembly 400 may be arranged at one end of the battery pack 200 facing the first cover 110 of the housing 100. The protection plate 300 is fixedly mounted on the side of the first cover 110 facing the battery pack 200, and the support plate assembly 400 is arranged between the protection plate 300 and the battery pack 200. When the first cover 110 of the housing 100 is covered on the shell 120 and fixedly connected with the shell 120, the first cover 110 pushes the support plate assembly 400 to achieve the fixation and position limitation of the battery pack 200 in the housing 100. The support plate assembly 400 includes a support plate 410 and a first buffer layer 420 and a second buffer layer 430 respectively located on two surfaces of the support plate 410, the first buffer layer 420 abuts against one end of the battery pack 200 facing the first cover 110, and the second buffer layer 430 abuts against the first cover 110. The buffering effect of the first buffer layer 420 and the second buffer layer 430 can prevent the battery pack 200 from being damaged. The support plate 410 ensures the strength of the support plate assembly 400, so that the battery pack 200 can be reliably fixed inside the housing 100. In addition, the support plate assembly 400 also serves to isolate the protection plate 300 and the battery pack 200, preventing the heat generated by the protection plate 300 from affecting the battery pack 200, and preventing the components on the surface of the protection plate 300 from damaging the battery pack 200. In this way, the isolation between the protection plate 300 and the battery pack 200 and the fixation of the battery pack 200 in the housing 100 are achieved without using a bracket, saving the mold opening cost of the bracket, thereby reducing the total cost of the battery pack.

[0058] In one embodiment, Figure 2 and Figure 5-Figure 8 As shown, the battery pack 200 includes a plurality of battery cells 210 and a collection board 220. The plurality of battery cells 210 are stacked, and the collection board 220 is installed on the side of the plurality of battery cells 210 facing the first cover 110, and the pole lugs of the battery cells 210 are electrically connected to the collection board 220. A supporting foam 270 is arranged between the pole lugs of two adjacent battery cells 210, and the supporting foam 270 is configured to support the pole lugs of the battery cells 210 and the collection arms of the collection board 220, and the pole lugs of each battery cell 210 and the collection arms of the collection board 220 are respectively against the first buffer layer 420.

[0059] This embodiment does not limit the number of battery cells 210, and those skilled in the art can set it according to actual needs. Among them, the acquisition board 220 can play a role in data acquisition, and the acquisition arm of the acquisition board 220 is electrically connected to the pole ear of the battery cell 210. The acquisition board 220 can be electrically connected to the protection board 300 through a cable. The protection board 300 can obtain key information of each battery cell 210 through the acquisition board 220, such as voltage, current, temperature, etc., to evaluate the state of the battery pack 200. Exemplarily, the pole ear of each battery cell 210 can be electrically connected to the corresponding acquisition arm on the acquisition board 220 by welding.

[0060] Schematically, the supporting foam 270 can play the role of insulation and support between the tabs of two adjacent battery cells 210, thereby preventing a short circuit between the tabs of two adjacent battery cells 210 and supporting the collection board 220. Specifically, one end of each supporting foam 270 abuts against the main body of the battery cell 210, and the other end of each supporting foam 270 supports the collection board 220.

[0061] In one possible implementation, Figure 2 and Figure 7 As shown, after being stacked, the multiple battery cells 210 can be bound and fixed by a binding tape 260 . The number of the binding tapes 260 can be two, and the two binding tapes 260 are respectively arranged near the two ends of the multiple battery cells 210 .

[0062] In this embodiment, the acquisition board 220 can collect key information of each battery cell 210. After the pole lugs of the battery cell 210 are connected to the corresponding acquisition arms of the acquisition board 220, they are respectively abutted against the first buffer layer 420 of the support plate assembly 400, so that the support plate assembly 400 can respectively fix the acquisition board 220 and each battery cell 210. In addition, the first buffer layer 420 can also protect the pole lugs of each battery cell 210 and the acquisition arms of the acquisition board 220, so as to prevent the surface components of the protection board 300 from touching the acquisition arms of the acquisition board 220 or the pole lugs of the battery cell 210 and causing a short circuit.

[0063] In a specific embodiment, Figure 2-Figure 7 As shown, a hole 411 is provided on the support plate 410, and the cable connected between the collection plate 220 and the protection plate 300 is arranged through the hole 411. There are two first buffer layers 420, and the two first buffer layers 420 are respectively located on both sides of the hole 411. Collection arms are respectively provided on both sides of the collection plate 220, and the pole ears of multiple battery cells 210 are distributed in two rows. The collection arm on one side of the collection plate 220 and the pole ears of each battery cell 210 in one row are respectively against one of the first buffer layers 420, and the collection arm on the other side of the collection plate 220 and the pole ears of each battery cell 210 in another row are respectively against the other first buffer layer 420.

[0064] The hole 411 may be located in the middle of the support plate 410, and the shape of the hole 411 may be a suitable shape such as a rectangle, a circle or a polygon, which is not limited here. In a possible implementation, a connector for connecting a cable is provided on the side of the acquisition board 220 away from the battery pack 200, and the hole 411 on the support plate 410 is provided opposite to the connector.

[0065] Schematically, after the multiple battery cells 210 are stacked, the tabs of the multiple battery cells 210 are distributed in two rows. The collection board 220 includes a circuit board and collection arms located on both sides of the circuit board. One row of tabs is electrically connected to the collection arm on one side of the circuit board, and the other row of tabs is electrically connected to the collection arm on the other side of the circuit board.

[0066] In this embodiment, the hole 411 on the support plate 410 ensures normal communication between the acquisition plate 220 and the protection plate 300. The two first buffer layers 420 are against the tabs of the battery pack 200, ensuring the reliability of the support plate assembly 400 in limiting the battery pack 200. In addition, one of the first buffer layers 420 can protect the acquisition arm on one side of the acquisition plate 220 and the tabs of each battery cell 210 in one row, and the other first buffer layer 420 can protect the acquisition arm on the other side of the acquisition plate 220 and the tabs of each battery cell 210 in another row.

[0067] In a more specific embodiment, Figure 2-Figure 7 as well as Fig. 9 As shown, support portions 112 are respectively provided at both ends of the first cover body 110 facing the battery pack 200, there are two second buffer layers 430, the two second buffer layers 430 are respectively located on opposite sides of the hole 411, and the two support portions 112 correspond to and abut against the two second buffer layers 430 one by one.

[0068] Illustratively, the first cover body 110 further includes a main body 111 , and each support portion 112 may be a frame-shaped structure. Each support portion 112 may be disposed at both ends of the main body 111 facing the battery pack 200 by an integrated molding process.

[0069] It is worth mentioning that after the protection plate 300 is fixed to the first cover 110, the protection plate 300 is located between the two support portions 112. In a possible implementation, Fig. 9 As shown, a portion of the main body 111 located between the two support portions 112 is provided with a plurality of mounting columns 114, and an end of each mounting column 114 away from the main body 111 can be abutted against the protective plate 300, and the fastener can be locked on the mounting column 114 after passing through the protective plate 300 to achieve fixation between the protective plate 300 and the first cover body 110.

[0070] It can be understood that the two second buffer layers 430 are respectively opposite to the two support portions 112 of the first cover 110. After the two support portions 112 of the first cover 110 are respectively against the two second buffer layers 430, it can be ensured that the support plate assembly 400 is subjected to uniform force, thereby ensuring that the support plate assembly 400 can reliably fix the battery pack 200. In addition, the number of the second buffer layers 430 is set to two and the two second buffer layers 430 are respectively located on opposite sides of the hole 411, which can avoid the second buffer layer 430 from interfering with the cables between the acquisition board 220 and the protection board 300.

[0071] In a possible implementation, an adhesive layer is provided on a side of the first buffer layer 420 facing away from the support plate 410 , and the adhesive layer is respectively bonded and fixed to the collection arm of the collection plate 220 and the tabs of each battery cell 210 .

[0072] In a possible implementation, a double-sided adhesive may be provided as an adhesive layer on the side of the first buffer layer 420 away from the support plate 410. During the assembly of the battery pack, after the battery pack 200 is placed in the accommodating cavity of the shell 120, the first buffer layer 420 may be attached to the collection arm of the collection plate 220 and the surface of the tab of the battery cell 210 through the adhesive layer on the first buffer layer 420, so as to achieve pre-fixation between the support plate assembly 400 and the battery pack 200.

[0073] With this structure, during the assembly of the battery pack, the support plate assembly 400 can be first fixed on the battery pack 200 to prevent the support plate assembly 400 from moving relative to the shell 120 during the connection between the first cover body 110 and the shell 120, thereby ensuring that the support plate assembly 400 will not interfere with the rest of the first cover body 110.

[0074] In one embodiment, Figure 5 and Figure 7 As shown, a heat insulating sheet 230 is disposed between two adjacent battery cells 210 .

[0075] Exemplarily, the size of the heat insulating sheet 230 matches the size of the main part of the battery cell 210, and the heat insulating sheet 230 can be clamped between two battery cells 210. In a possible implementation, the two sides of the heat insulating sheet 230 can be respectively bonded and fixed to the two battery cells 210. It can be understood that the material of the heat insulating sheet 230 has low thermal conductivity, and when some battery cells 210 have thermal runaway, the heat of the battery cells 210 will not be transferred to the remaining battery cells 210 of the battery pack 200.

[0076] By providing a heat insulating sheet 230 between two adjacent battery cells 210 , the heat spread and heat diffusion caused by high temperature fire of individual battery cells 210 can be effectively blocked, thereby effectively reducing the risk of fire and explosion of the entire battery pack and improving the safety of the battery pack.

[0077] In a possible implementation, the thermal insulation sheet 230 is an aerogel sheet.

[0078] That is, the heat insulation sheet 230 is made of aerogel. The aerogel sheet becomes soft and elastic when heated, and when the battery cell 210 expands and squeezes, the thickness of the aerogel sheet is compressed, which can effectively provide the battery cell 210 with space for expansion.

[0079] By using an aerogel sheet as the thermal insulation sheet 230 and utilizing the flame retardant and thermal insulation properties of the aerogel sheet, the heat spreading and diffusion between two adjacent battery cells 210 can be effectively prevented while reducing the squeezing of the adjacent battery cells 210 and the outer shell 100 when the battery cell 210 expands, thereby further improving the safety of the battery pack.

[0080] In one embodiment, Figure 7 As shown, the battery pack further includes a heating film 240 . The heating film 240 is wound and attached to the plurality of battery cells 210 , and the heating film 240 is electrically connected to the protection plate 300 .

[0081] The heating film 240 is a sheet structure, and the heating film 240 can be bent so that the heating film 240 forms a circuitous reciprocating structure. Schematically, the heating film 240 can be electrically connected to the protection plate 300, and the heating film 240 is powered by the protection plate 300 to make the heating film 240 generate heat. The heating temperature of the heating film 240 can be controlled by controlling the current passed through the heating film 240. Exemplarily, the large surface of each battery cell 210, that is, the side with a larger area of ​​the battery cell 210, can be bonded and fixed to the heating film 240.

[0082] With this structure, when the external ambient temperature of the battery pack is low, the heating film 240 can heat the battery cell 210 to improve the charge and discharge efficiency of the battery pack 200. For example, when the ambient temperature is below 0 degrees, the heating film 240 can heat the battery cell 210 to 30 degrees, thereby improving the charge and discharge efficiency of the battery pack 200.

[0083] like Figure 7 As shown, there are multiple heating films 240 , and the multiple heating films 240 are arranged in sequence along the stacking direction of the multiple battery cells 210 .

[0084] For example, Figure 7 As shown, the number of heating films 240 can be two, and each heating film 240 is respectively connected to a plurality of battery cells 210. Among them, each heating film 240 can be electrically connected to the protection plate 300. It can be understood that the heating film 240 and the plurality of battery cells 210 connected to the heating film 240 form a battery unit, and the plurality of battery units are stacked. This embodiment does not limit the specific number of heating films 240 and the number of battery cells 210 connected to each heating film 240, and those skilled in the art can set it according to actual needs.

[0085] In this embodiment, the number of the heating films 240 is set to be multiple, which reduces the size of a single heating film 240 and facilitates the arrangement of the heating films 240 .

[0086] like Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, in a possible implementation, a notch 440 is provided at the edge of the support plate assembly 400 , and a cable connected between the heating film 240 and the protection plate 300 is provided through the notch 440 .

[0087] Exemplarily, notches 440 may be provided at four corners of the support plate assembly 400. Notches 440 are provided at the edge of the support plate 410, the edge of the first buffer layer 420, and the edge of the second buffer layer 430.

[0088] By providing a notch 440 at the edge of the support plate assembly 400 for the cables between the heating film 240 and the protection plate 300 to pass through, the protection plate 300 can reliably supply power to the heating film 240 .

[0089] In one embodiment, Figure 2 and Fig. 9 As shown, a limiting portion 113 is disposed on a side of the first cover 110 facing the battery pack 200 . The limiting portion 113 extends into the interior of the housing 120 and is fixedly connected to the side wall of the housing 120 .

[0090] Exemplarily, the limiting portion 113 may be a strip-shaped sheet structure. When the first cover 110 is covered on the shell 120, the limiting portion 113 extends into the interior of the shell 120 at one end facing the battery pack 200. In a possible implementation, a fastening hole is provided at one end of the limiting portion 113 facing the battery pack 200. When the first cover 110 is covered on the shell 120, the one end of the limiting portion 113 facing the battery pack 200 abuts against the inner wall of the shell 120. A fastener may be used to pass through the side wall of the shell 120 and lock on the fastening hole of the limiting portion 113 to achieve fixation between the first cover 110 and the shell 120. There may be multiple limiting portions 113, and multiple limiting portions 113 may be installed on the main body 111 of the first cover 110 through an integrated molding process.

[0091] In this structure, the first cover body 110 can be locked on the housing 120 through the limiting portion 113 on the first cover body 110 and the fastener, so as to prevent the first cover body 110 from falling off from the housing 120.

[0092] like Figure 2 As shown, in a possible implementation, foam is disposed between the battery pack 200 and the side wall of the housing 120 .

[0093] Schematically, the foam between the battery pack 200 and the housing 120 includes two first foams 251 and two second foams 252. The two first foams 251 can be respectively attached to the large outer surfaces of the two battery cells 210 at both ends of the battery pack 200. The two second foams 252 can be respectively attached to the opposite sides of the battery pack 200. This embodiment does not limit the specific thickness of each foam, and those skilled in the art can set it as needed.

[0094] By disposing foam between the battery pack 200 and the side wall of the housing 120 , it is prevented that the battery pack 200 and the side wall of the housing 120 collide with each other and thus cause damage to the battery pack 200 .

[0095] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the housing 120 includes a frame 121 and a second cover 122. The first cover 110 is covered at one end of the frame 121 and fixedly connected to the frame 121, and the second cover 122 is covered at the other end of the frame 121 and fixedly connected to the frame 121.

[0096] An aluminum frame can be used as the frame 121, and the first cover 110 and the second cover 122 are respectively located at opposite ends of the frame 121, and the first cover 110 and the second cover 122 can be fixedly connected to the frame 121 by fasteners. One end of the frame 121 can be blocked by the first cover 110, and the other end of the frame 121 can be blocked by the second cover 122.

[0097] The above arrangement facilitates maintenance of the battery pack. When maintaining the side of the battery pack 200 away from the first cover 110 , the staff can remove the second cover 122 from the frame 121 for maintenance.

[0098] The following briefly introduces the assembly process of the battery pack so that those skilled in the art can better understand the technical solution of the present application.

[0099] 1. Assemble the battery cell 210, the heating film 240, the aerogel sheet, the collection board 220, and the binding tape 260, spot weld the pole ear of each battery cell 210 and the collection arm of the collection board 220 to form a battery pack 200, and attach two first foams 251 and two second foams 252 to the four sides of the battery pack 200 respectively.

[0100] 2. Place the battery pack 200 with foam pasted on it into the frame 121, cover the second cover 122 on the frame 121 and lock it with the frame 121 through fasteners, place the battery pack 200 into the shell 120 until the end of the battery pack 200 is against the second cover 122, and attach the support plate assembly 400 to the lugs of the collection plate 220 of the battery pack 200 and the lug surfaces of the battery cell 210.

[0101] 3. Fix the protection plate 300 to the first cover body 110 through fasteners, place the first cover body 110 assembled with the protection plate 300 on the frame body 121 and press down with force, fix the first cover body 110 and the frame body 121 through the limiting part 113 on the first cover body 110 and the fasteners to complete the assembly.

[0102] 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: The housing comprises a first cover and a shell, wherein the shell has a receiving cavity, and the first cover is disposed on the shell and is fixedly connected to the shell; A battery pack is arranged inside the accommodating cavity; A protection plate, fixedly mounted on a side of the first cover body facing the battery pack; A support plate assembly is located between the battery pack and the protective plate, and the support plate assembly includes a support plate, a first buffer layer and a second buffer layer, the first buffer layer and the second buffer layer are respectively arranged on two surfaces of the support plate, the first buffer layer is against one end of the battery pack facing the first cover body, and the second buffer layer is against the first cover body.

2. The battery pack according to claim 1, characterized in that: The battery pack includes a plurality of battery cells and a collection board, wherein the plurality of battery cells are stacked, the collection board is installed on one side of the plurality of battery cells facing the first cover, and the tabs of the battery cells are electrically connected to the collection board; A supporting foam is arranged between the tabs of two adjacent battery cells, and the supporting foam is configured to support the tabs of the battery cells and the collecting arms of the collecting plate. The tabs of each battery cell and the collecting arms of the collecting plate are respectively against the first buffer layer.

3. The battery pack according to claim 2, characterized in that: The support plate is provided with a hole, and the cable connected between the collection plate and the protection plate is arranged through the hole, and the number of the first buffer layers is two, and the two first buffer layers are respectively located on both sides of the hole; The collecting arms are respectively arranged on both sides of the collecting plate, and the tabs of the plurality of battery cells are distributed in two rows. The collecting arms on one side of the collecting plate and the tabs of the battery cells in one row are respectively abutted against one of the first buffer layers, and the collecting arms on the other side of the collecting plate and the tabs of the battery cells in another row are respectively abutted against another first buffer layer.

4. The battery pack according to claim 3, characterized in that: Support parts are respectively provided at both ends of the first cover body facing the battery pack. There are two second buffer layers, which are respectively located on opposite sides of the hole. The two support parts are respectively against the two second buffer layers in a one-to-one correspondence.

5. The battery pack according to claim 2, characterized in that: An adhesive layer is provided on a side of the first buffer layer facing away from the support plate, and the adhesive layer is respectively bonded and fixed to the collection arm of the collection plate and the tabs of each of the battery cells.

6. The battery pack according to claim 2, characterized in that: A heat insulating sheet is arranged between two adjacent battery cells.

7. The battery pack according to claim 6, characterized in that: The thermal insulation sheet is an aerogel sheet.

8. The battery pack according to claim 2, characterized in that: The battery pack further includes a heating film, which is wound and attached to the plurality of battery cells, and is electrically connected to the protection plate.

9. The battery pack according to claim 8, characterized in that: There are multiple heating films, and the multiple heating films are arranged in sequence along the stacking direction of the multiple battery cells; and / or, A notch is arranged at the edge of the support plate assembly, and a cable connected between the heating film and the protection plate is arranged through the notch.

10. The battery pack according to any one of claims 1 to 9, characterized in that: A limiting portion is disposed on a side of the first cover body facing the battery pack. The limiting portion extends into the interior of the shell and is fixedly connected to a side wall of the shell.

11. The battery pack according to any one of claims 1 to 9, characterized in that: Foam is arranged between the battery pack and the side wall of the shell.

12. The battery pack according to any one of claims 1 to 9, characterized in that: The shell comprises a frame body and a second cover body, wherein the first cover body is covered at one end of the frame body and fixedly connected to the frame body, and the second cover body is covered at the other end of the frame body and fixedly connected to the frame body.

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