Battery pack and electric device

Abstract

The application provides a battery pack and an electric device, and relates to the technical field of new energy batteries. The battery pack provided by the application comprises a box body, an opening, and a containing cavity connected to the opening; a box cover, which is arranged on the opening and fixedly connected with the box body; a cell stack, which comprises a plurality of cell monomers arranged in multiple rows and multiple columns, and the plurality of cell monomers are fixedly arranged in the containing cavity; and a pressing piece, which is arranged between the cell monomer and the box cover, and is arranged at intervals along the width direction of the plurality of cell monomers, and each pressing piece extends along the thickness direction of the cell monomer to press on the multiple columns of cell monomers. The battery pack provided by the application is provided with a supporting structure between the cell stack and the box cover, and the anti-treading capability of the battery pack is strengthened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy battery, in particular to a battery pack and an electric device. BACKGROUND

[0002] The battery integration technology in the new energy industry includes Cell to Battery pack (CTB) and Cell to Chassis (CTC), under which 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 and application of the CTB and CTC schemes, it is found that the battery technology has hidden dangers for the safety of the vehicle. Specifically, the cover structure of the battery pack is insufficient in strength and low in anti-treading ability. SUMMARY

[0004] The present application provides a battery pack and an electric device, wherein a support structure is arranged between the cell stack and the cover of the battery pack, thereby enhancing the anti-treading ability of the battery pack.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The first aspect of the present application provides a battery pack, comprising: a box body having an opening and a containing cavity communicating with the opening;

[0007] a cover arranged on the opening and fixedly connected with the box body;

[0008] a cell stack comprising a plurality of cell monomers arranged in multiple rows and multiple columns, the plurality of cell monomers being fixedly arranged in the containing cavity;

[0009] a pressing piece abutting between the cell monomer and the cover, the plurality of pressing pieces being arranged at intervals along the width direction of the plurality of cell monomers, and each pressing piece extending along the thickness direction of the cell monomer to press on the multiple columns of cell monomers.

[0010] In a possible implementation, along the width direction of the cell monomer, at least one pressing piece is arranged to press on two adjacent columns of cell monomers, and along the height direction of the cell monomer, the orthographic projection of the pressing piece covers the orthographic projection of the side edges of the two adjacent columns of cell monomers.

[0011] And / or, the cell monomer is provided with a pressure relief valve, and at least two pressing pieces are arranged on opposite sides of the pressure relief valve along the width direction of the cell monomer.

[0012] In a possible implementation, the pressure contact member comprises 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 monomer, and the pressure strip abuts against the box cover.

[0013] In a possible implementation, the pressure contact member further comprises 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 comprises a fixedly connected cover plate and a fireproof plate, the fireproof plate abuts against the pressure contact member, and the material of the fireproof plate comprises mica.

[0015] In a possible implementation, the box cover further comprises an insulating plate, the insulating plate 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 / m·k.

[0016] In a possible implementation, the box cover further comprises a heat insulation pad, the thermal conductivity of the heat insulation pad is less than or equal to 0.04 W / m·k, the heat insulation pad is fixed between the insulating plate and the cover plate, and the orthogonal projection of the heat insulation pad along the height direction of the battery cell monomer coincides with the orthogonal projection of the two pressure contact members on both sides of the pressure relief valve.

[0017] In a possible implementation, the box cover comprises at least two support strips, the two support strips are fixed between the insulating plate and the cover plate, and the two support strips are respectively opposite to the pressure contact members abutting against adjacent two battery cell monomers along the height direction of the battery cell monomer.

[0018] In a possible implementation, further comprising a busbar, a low-voltage acquisition member and an elastic pad, the busbar is arranged between the battery cell monomer and the box cover, and the busbar is electrically connected to the battery cell monomer, the low-voltage acquisition member is fixed to the busbar through the elastic pad, and the low-voltage acquisition member is electrically connected to the busbar.

[0019] In a possible implementation, further comprising a protective sheet, the protective sheet is bonded to the low-voltage acquisition member, and the orthogonal projection of the protective sheet along the height direction of the battery cell monomer covers the low-voltage acquisition member and the busbar.

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

[0021] By arranging a plurality of pressure contact members between the battery cell monomers of the battery cell stack and the box cover, and extending the pressure contact members along the thickness direction of the battery cell monomers, sufficient support is provided for the box cover from one side of the battery cell stack, the ability of the box cover to resist stepping from the side away from the battery cell stack is improved, and the structural strength of the battery pack as a whole is improved, meeting the structural requirements of the box cover as a vehicle body floor.

[0022] The second aspect of the present application provides a battery pack.

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

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] Figure 1 The exploded view of the battery pack provided by the embodiments of the present application;

[0026] Figure 2 The schematic view of the assembled box cover and box body provided by the embodiments of the present application;

[0027] Figure 3 The schematic view of the box cover in Figure 2 The schematic view of the peripheral structure of the pressure relief valve in

[0028] Figure 4 The exploded view of the pressure contact in Figure 1

[0029] The exploded view of the box cover in Figure 5 Figure 1 The exploded view of the box cover in

[0030] Figure 6 The exploded view of the low-pressure collection assembly and bus bar in Figure 1

[0031] Explanation of reference signs:

[0032] 100, box body;

[0033] 110, accommodating cavity;

[0034] 200, box cover;

[0035] 210, cover plate;

[0036] 220, fireproof plate;

[0037] 230, insulating plate;

[0038] 240, heat insulation pad;

[0039] 250, support strip;

[0040] ​300, cell stack;

[0041] 310, cell monomer;

[0042] 400, crimping piece;

[0043] 410, crimping strip;

[0044] 420, flexible pad;

[0045] 430, buffer pad;

[0046] 500, pressure relief valve;

[0047] 600, busbar;

[0048] 700, low pressure acquisition piece;

[0049] 800, elastic pad;

[0050] 900, protective sheet.

[0051] Through the above drawings, the specific embodiments of the present application have been shown, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept 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, the battery integration technology in the new energy industry includes Cell to Battery pack (CTB) and Cell to Chassis (CTC), under which the box 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 and application of the CTB and CTC schemes, it is found that the battery technology has hidden dangers for the safety of the vehicle. Specifically, the structural strength of the box cover of the battery pack is insufficient, and the anti-treading ability is low. The inventor found that the main reason for this problem is that there is a lack of support structure between the cell stack and the box cover in the battery pack.

[0054] In addition, when the cells in the battery pack have thermal runaway, the existing box cover is easy to rise to a high temperature, and even burn through, which threatens the personal safety of the people in the vehicle.

[0055] To solve the above technical problems, the battery pack and the electric device are provided, a plurality of pressure pieces are arranged between the battery monomer and the box cover of the battery stack, and the pressure pieces extend along the thickness direction of the battery monomer, sufficient support is provided for the box cover from one side of the battery stack, the stepping ability of the box cover against the side away from the battery stack is improved, and then the structural strength of the battery pack as a whole is improved to meet the structural requirement of the box cover as a vehicle body floor.

[0056] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0057] Reference Figures 1 to 6 The battery pack provided by the embodiments of the present application includes: a box body 100 having an opening and a containing cavity 110 communicated with the opening; a box cover 200 covering the opening and fixedly connected with the box body 100; a battery stack 300 including a plurality of battery monomers 310 arranged in multiple rows and multiple columns, the plurality of battery monomers 310 being fixedly arranged in the containing cavity 110; and a pressure piece 400 abutting between the battery monomer 310 and the box cover 200, the plurality of pressure pieces 400 being arranged at intervals along the width direction of the plurality of battery monomers 310, and each pressure piece 400 extending along the thickness direction of the battery monomer 310 to press on the battery monomers 310 in multiple columns.

[0058] In this way, by arranging the plurality of pressure pieces 400 at intervals between the battery monomer 310 and the box cover 200 of the battery stack 300, and extending the pressure pieces 400 along the thickness direction of the battery monomer 310, sufficient support is provided for the box cover 200 from one side of the battery stack 300, the stepping ability of the box cover 200 against the side away from the battery stack 300 is improved, and then the structural strength of the battery pack as a whole is improved to meet the structural requirement of the box cover 200 as a vehicle body floor.

[0059] In some embodiments, along the width direction of the battery monomer 310, at least one pressure piece 400 presses on two adjacent columns of battery monomers 310, and along the height direction of the battery monomer 310, the orthographic projection of the pressure piece 400 covers the orthographic projection of the side edges of the two adjacent columns of battery monomers 310; and / or, a pressure relief valve 500 is arranged on the battery monomer 310, and along the width direction of the battery monomer 310, at least two pressure pieces 400 are arranged on opposite sides of the pressure relief valve 500.

[0060] In this way, by arranging the pressure connectors 400 on both sides of the pressure relief valves 500 on the battery monomers 310 of the battery stack 300 and between two adjacent rows of battery monomers 310 (the shoulder of the battery monomers 310), the box cover 200 is supported by more from one side of the battery stack 300, and the ability of the box cover 200 to resist the trampling away from the side of the battery stack 300 is significantly improved; at the same time, the use of multiple pressure connectors 400 with the box cover 200 also weakens the turbulent gas and eruption material after thermal runaway, further reducing the risk of secondary thermal runaway caused by insulation damage.

[0061] That is, the pressure relief valves 500 and the busbar 600 region of the battery monomers 310 are separated by the pressure connectors 400 to avoid damage to the busbar 600 region by the eruption material of the pressure relief valves 500.

[0062] For example, the battery stack 300 includes six rows of battery monomers 310, and each row of battery monomers 310 is a plurality of 5 pressure connectors 400 are respectively pressed between each two adjacent rows of battery monomers 310, that is, each pressure connector 400 is clamped on the shoulder of the battery monomers 310.

[0063] Moreover, the two sides of the pressure relief valves 500 on each row of battery monomers 310 are provided with pressure connectors 400, which are more supportive to the box cover 200.

[0064] In some embodiments, the pressure connector 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 monomers 310, and the pressure strip 410 abuts against the box cover 200.

[0065] For example, the flexible pad 420 is an elastic rubber pad with a certain compression performance, and the hardness range can be Shore A10 to Shore A95, and the material of the flexible pad 420 can be a structural adhesive or a rubber sheet with a certain compression capacity.

[0066] In this way, the pressure connector 400 can be perfectly fitted with the battery stack 300, and the battery stack 300 can also be prevented from receiving excessive pressure, the pressure strip 410 has insulation properties, and the material can be a composite material or a plastic part, mainly serving as a force bearing part.

[0067] In some embodiments, the pressure connector 400 further includes a buffer pad 430, the buffer pad 430 is fixed between the pressure strip 410 and the box cover 200, and the buffer pad 430 is located at the upper part of the pressure connector 400, for buffering between the pressure connector 400 and the box cover 200, and also ensuring the close fit of the pressure connector 400 and the box cover 200.

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

[0069] The fireproof plate 220 has insulation and fire-resistant performance, and is exemplarily a mica plate or other composite material containing mica. The fireproof plate 220 is located at the lowermost layer of the box cover 200 and is directly attached to the crimping piece 400.

[0070] In some embodiments, the box cover 200 further comprises an insulating plate 230 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 0.3 W / m.k, for example, the thermal conductivity of the insulating plate 230 is 0.2 W / m.k.

[0071] The insulating plate 230 further strengthens the structural strength of the fireproof plate 220 and plays a heat insulation role, preventing the burst 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 influence of the hot gas flow generated when the battery cell 310 is in thermal runaway 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 further comprises a thermal insulation pad 240 having a thermal conductivity less than or equal to 0.04 W / m.k, for example, the thermal conductivity of the thermal insulation pad 240 is 0.04 W / m.k. The thermal insulation pad 240 is fixed between the insulating plate 230 and the cover plate 210, and the orthographic projection of the thermal insulation pad 240 coincides with the orthographic projection of the two crimping pieces 400 on both sides of the pressure relief valve 500 in the height direction of the battery cell 310, that is, the thermal insulation pad 240 is opposite to the two crimping pieces 400.

[0074] Further, the thermal insulation pad 240 is an aerogel pad, and exemplarily, the compression amount of the thermal insulation pad 240 in the present embodiment is less than or equal to 30% under a pressure of 2 MPa, having a good supporting effect.

[0075] In more examples, the box cover 200 comprises at least two support strips 250 fixed between the insulating plate 230 and the cover plate 210.

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

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

[0078] That is, the multi-layer structure of the box cover 200 and the cooperation of the crimping piece 400 divide the upper part of the battery stack into a plurality of insulated and fireproof areas, and make the top of the battery pack have strong anti-treading ability.

[0079] In some embodiments, a bus bar 600, a low-voltage collection piece 700 and an elastic pad 800 are further included, the bus bar 600 is arranged between the battery cell 310 and the box cover 200, and the bus bar 600 is electrically connected with the battery cell 310, the low-voltage collection piece 700 is fixed to the bus bar 600 through the elastic pad 800, and the low-voltage collection piece 700 is electrically connected with the bus bar 600, and the elastic pad 800 is an insulating material.

[0080] Specifically, the low-voltage collection piece 700 includes a circuit board and a connector and a sensor connected to the circuit board, further, a nickel sheet is further connected to the circuit board, which is used for welding with the bus bar 600 to realize the circuit connection between the low-voltage collection piece 700 and the battery cell 310.

[0081] Specifically, the bus bar 600 is located above the battery cell pole and is welded with the battery cell pole, and one bus bar 600 can realize the series connection of one row of battery cells 310, and the bus bar 600 can be a low-resistance path for the battery cell 310, so that the current flows between the battery cells.

[0082] In this way, the reliability of the low-voltage collection piece 700 is ensured by the elastic pad 800 and the protective sheet, specifically, by arranging the elastic pad 800 with insulation and stretchable and elastic properties, not only can the low-voltage collection piece 700 be insulated from the bus bar 600, but also the stretchable and elastic properties of the elastic pad 800 can avoid damage to the low-voltage collection piece 700 caused by the breathing expansion of the battery cell.

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

[0084] For example, the protective sheet is made of polyimide or fiber reinforced plastic (FRP), which can protect the low-pressure collecting part 700 and the busbar 600.

[0085] In a second aspect, the embodiments of the present application provide a battery pack, which can be used in an electric vehicle / equipment (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle.

[0086] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0087] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0088] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0089] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly contacting the first and second features, or indirectly contacting the first and second features through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0090] The embodiments or implementations in the present specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

[0091] It should be noted that the embodiments referred to in the specification as "one embodiment", "an embodiment", "example embodiment", "some embodiments" and the like can include a specific feature, structure or characteristic, but not necessarily every embodiment. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure or characteristic in combination with other embodiments, whether explicitly described or not.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and such modifications or replacements do not make the essence of the corresponding technical solutions 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 (100) has an opening and a receiving cavity (110) communicating with the opening; A lid (200) is provided over the opening and fixedly connected to the box body (100); The battery cell stack (300) includes multiple battery cell units (310) arranged in multiple rows and columns, and the multiple battery cell units (310) are fixedly disposed in the receiving cavity (110); A crimping member (400) abuts between the battery cell (310) and the casing (200). The crimping members (400) are spaced apart along the width direction of the plurality of battery cells (310), and each crimping member (400) extends along the thickness direction of the battery cell (310) to press on the plurality of battery cells (310). The battery cell (310) is provided with a pressure relief valve (500), and at least two of the crimping members (400) are respectively disposed on opposite sides of the pressure relief valve (500) along the width direction of the battery cell (310). The box cover (200) includes a cover plate (210) and a fireproof plate (220) that are fixedly connected, and the fireproof plate (220) presses against the crimping member (400); The box cover (200) also includes an insulating plate (230), which is fixed between the cover plate (210) and the fireproof plate (220); The cover (200) also includes a heat insulation pad (240), which 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 heat insulation pad (240) coincides with the orthographic projection of the two crimping parts (400) on both sides of the pressure relief valve (500).

2. The battery pack according to claim 1, characterized in that, Along the width direction of the battery cell (310), at least one of the crimping members (400) is pressed onto two adjacent rows of battery cells (310), and along the height direction of the battery cell (310), the orthographic projection of the crimping member (400) covers the orthographic projection of the side edges of the two adjacent rows of battery cells (310).

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

4. The battery pack according to claim 3, characterized in that, The crimping member (400) also includes a buffer pad (430), which is fixed between the pressure strip (410) and the box cover (200).

5. The battery pack according to claim 2, characterized in that, The fireproof board (220) is made of mica.

6. The battery pack according to claim 5, characterized in that, 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 thermal conductivity of the heat insulation pad (240) is less than or equal to 0.04 W / mk.

8. The battery pack according to claim 6, characterized in that, The cover (200) includes at least two support bars (250), which are fixed 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 member (400) that is pressed on two adjacent battery cells (310).

9. The battery pack according to claim 1 or 2, characterized in that, It also includes a busbar (600), a low-voltage acquisition device (700), and an elastic pad (800). The busbar (600) is disposed between the battery cell (310) and the casing cover (200), and the busbar (600) is electrically connected to the battery cell (310). The low-voltage acquisition device (700) is fixed to the busbar (600) by the elastic pad (800), and the low-voltage acquisition device (700) is electrically connected to the busbar (600).

10. The battery pack according to claim 9, characterized in that, It also includes a protective sheet, which is adhered to the low-voltage acquisition unit (700), and the orthographic projection of the protective sheet covers the low-voltage acquisition unit (700) and the busbar (600) along the height direction of the battery cell (310).

11. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-10.

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