Battery pack

Abstract

The utility model provides a battery pack and relates to the technical field of battery equipment. The battery pack comprises a battery cell, a mounting box and a liquid cooling plate; a plurality of mounting grooves are formed in the bottom wall of the mounting box, the plurality of mounting grooves are arranged in a plurality of rows, the plurality of battery cells and the plurality of liquid cooling plates are arranged in the mounting box, the battery cells are arranged in the mounting grooves and are positioned between two adjacent liquid cooling plates, and the liquid cooling plates are connected with the battery cells and are used for exchanging heat for the battery cells. The plurality of battery cells are respectively arranged in the plurality of mounting grooves, so that the battery cells are effectively fixed; liquid cooling plates are arranged on the two sides of each row of battery cells, so that heat exchange with the battery cells is realized; therefore, the battery pack provided by the utility model is simple in structure, not only can effectively fix a plurality of battery cells, but also can effectively perform heat exchange on the battery cells; the battery cell is not directly adhered to the tray, so that the single battery cell needing to be maintained only needs to be dug out through a special tool during maintenance, the maintenance is convenient, and the maintenance cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of battery equipment, and more particularly, to a battery pack. Background Art

[0002] There are mainly two ways for the structure of the existing battery pack: one is to use plastic upper and lower shells to wrap and fix the battery cells to form a battery module, and then fix one or more modules inside a box to form a battery pack; the other is to place the battery cells on a tray, and after welding the battery cells and the busbar, pour potting glue to fix the battery cells.

[0003] However, for the first one, the connection structure of the battery cells is relatively complex, and the fixation of the battery cells is also relatively unstable. In addition, this structure may also require special heat dissipation and protection measures, thus increasing the cost of the battery pack; for the second one, there are problems such as relatively complex production and installation processes, and the poor maintainability of the battery cells due to welding the battery cells and the busbar and directly bonding them on the tray, thus increasing the maintenance cost. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery pack with a simple and stable structure, in which the battery cells can effectively exchange heat, is convenient for maintenance, and has a low maintenance cost.

[0005] The embodiments of the utility model are implemented as follows:

[0006] In a first aspect, the utility model provides a battery pack, including battery cells, a mounting box and a liquid cooling plate;

[0007] The bottom wall of the mounting box is provided with a plurality of mounting grooves, the plurality of mounting grooves are arranged in multiple rows, the number of the liquid cooling plates and the battery cells are both multiple, the multiple battery cells and the multiple liquid cooling plates are both arranged in the mounting box, and the battery cells are arranged in the mounting grooves and located between two adjacent liquid cooling plates, and the liquid cooling plate is connected to the battery cells for heat exchange of the battery cells.

[0008] In an optional embodiment, the battery pack further includes a bottom plate, and the bottom plate is arranged at the bottom of the mounting box for carrying the mounting box.

[0009] In an optional embodiment, the mounting box is provided with a baffle, the bottom wall of the mounting groove is provided with a first through hole, the edge of the baffle is provided with at least one connecting portion, and at least one connecting portion is connected to the edge of the first through hole so that the baffle blocks the first through hole, and the connecting portion is used for breaking when the explosion-proof valve of the battery cell is opened and the baffle is stressed.

[0010] In an alternative embodiment, the bottom plate is provided with a plurality of second through holes, and the plurality of second through holes are arranged in one-to-one correspondence with the plurality of first through holes.

[0011] In an alternative embodiment, the bottom plate and the mounting box are bonded by structural adhesive.

[0012] In an alternative embodiment, the battery pack further includes a liquid collecting end plate, the liquid collecting end plate is disposed at one or both ends of the mounting box, and the plurality of liquid cooling plates penetrate through the mounting box and communicate with the liquid collecting end plate, and the liquid collecting end plate is used for inputting or outputting a heat exchange medium to the plurality of liquid cooling plates.

[0013] In an alternative embodiment, the battery pack further includes a tray and a fastener, the mounting box is disposed on the tray, and the liquid collecting end plate is connected to the tray through the fastener.

[0014] In an alternative embodiment, the plurality of battery cells are arranged in a staggered manner, and the liquid cooling plate is at least partially attached to an adjacent battery cell.

[0015] In an alternative embodiment, the mounting box is made by a thermoforming process.

[0016] In an alternative embodiment, the bottom plate is made of epoxy material.

[0017] The beneficial effects of the battery pack provided by the embodiment of the present invention include: by respectively arranging a plurality of battery cells in a plurality of mounting grooves, the battery cells can be effectively fixed; and liquid cooling plates are arranged on both sides of each row of battery cells to realize heat exchange with the battery cells. It can be seen that the battery pack provided by the present invention has a simple structure, can not only effectively fix a plurality of battery cells, but also effectively heat exchange the battery cells; moreover, since the battery cells are not directly bonded to the tray, during maintenance, only the single battery cell to be repaired needs to be dug out by a special tool, which is convenient for maintenance and has low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a schematic structural diagram of the battery pack provided by the embodiment of the present invention;

[0020] Figure 2 is an exploded view of the battery pack provided by the embodiment of the present invention;

[0021] Figure 3 Partial enlarged view of the installation box provided by the embodiment of the present utility model;

[0022] Figure 4 Schematic diagram of the tray structure of the embodiment of the present utility model.

[0023] Icons: 10 - battery pack; 100 - battery cell; 200 - installation box; 210 - installation groove; 220 - retaining piece; 230 - first through hole; 240 - connecting part; 300 - liquid cooling plate; 400 - bottom plate; 410 - second through hole; 500 - liquid collecting end plate; 600 - tray. Specific embodiments

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, and does 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 cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0028] In addition, terms such as "horizontal" and "vertical" do not require the components to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] There are mainly two existing battery pack structures: one is to use plastic upper and lower shells to wrap and fix the battery cells to form a battery module, and then fix and install one or more modules inside the box to form a battery pack; the other is to place the battery cells on the tray, and after welding the battery cells to the busbar, pour potting glue to fix the battery cells.

[0031] However, the connection structure of the first type of battery cells is relatively complex, and the fixation of the battery cells is also relatively unstable. In addition, this structure may also require special heat dissipation and protection measures, so the cost of the battery pack will increase; the second type has problems such as relatively complex production and installation processes, and the poor maintainability of the battery cells due to welding the battery cells to the busbar and directly bonding them to the tray, thus increasing the maintenance cost.

[0032] Based on the above problems, please refer to Figures 1 to 4 , an embodiment of the present invention provides a battery pack 10, including battery cells 100, an installation box 200, and a liquid cooling plate 300.

[0033] Among them, the bottom wall of the installation box 200 is provided with a plurality of installation grooves 210, and the plurality of installation grooves 210 are arranged in multiple rows. The number of the liquid cooling plates 300 and the battery cells 100 are both multiple. The multiple battery cells 100 and the multiple liquid cooling plates 300 are both arranged in the installation box 200 by potting technology, and the battery cells 100 are arranged in the installation grooves 210 and located between two adjacent liquid cooling plates 300. The liquid cooling plate 300 is connected to the battery cell 100 for heat exchange with the battery cell 100.

[0034] In this embodiment, by respectively arranging a plurality of battery cells 100 in a plurality of installation grooves 210, the battery cells 100 can be effectively fixed; and liquid cooling plates 300 are arranged on both sides of each row of battery cells 100 to realize heat exchange with the battery cells 100. Thus, it can be seen that the battery pack 10 provided by the present utility model has a simple structure, can not only effectively fix a plurality of battery cells 100, but also effectively conduct heat exchange for the battery cells 100. Moreover, since the battery cells 100 are not directly adhered to the tray 600, during maintenance, only the single battery cell 100 to be repaired needs to be dug out by a special tool, which is convenient for maintenance and has low maintenance cost.

[0035] Further, the battery pack 10 further includes a bottom plate 400, and the bottom plate 400 is arranged at the bottom of the installation box 200 for carrying the installation box 200.

[0036] In this embodiment, by arranging the bottom plate 400 at the bottom of the installation box 200 to support the installation box 200, the structural strength and structural stability of the battery pack 10 can be improved.

[0037] Specifically, the bottom plate 400 and the installation box 200 are adhered by structural adhesive.

[0038] In this embodiment, the structural adhesive bonding method can not only make the bottom plate 400 and the installation box 200 stably and firmly connected, but also has a relatively low cost of the structural adhesive and is simple and convenient to operate.

[0039] Further, the installation box 200 is provided with a baffle 220, the bottom wall of the installation groove 210 is provided with a first through hole 230, at least one connecting portion 240 is arranged at the edge of the baffle 220, and at least one connecting portion 240 is connected to the edge of the first through hole 230 so that the baffle 220 blocks the first through hole 230, and the connecting portion 240 is used for breaking when the explosion-proof valve of the battery cell 100 is opened and the baffle 220 is stressed.

[0040] In this embodiment, by arranging the baffle 220 on the installation box 200 to block the through hole under normal use of the battery pack 10; when the battery cell 100 undergoes thermal runaway and the explosion-proof valve is activated, the ejected air flow and internal substances of the battery cell 100 act on the baffle 220 and the connecting portion 240, so that the connecting portion 240 can be disconnected to expose the first through hole 230; while the baffle 220 at the bottom of other non-runaway battery cells 100 can effectively block the ejected substances and air flow, thus avoiding secondary thermal runaway after the air flow directly contacts other battery cells 100.

[0041] It should be noted that the baffle 220, the connecting portion 240 and the bottom wall of the installation groove 210 are integrally formed.

[0042] Specifically, the number of the connecting parts 240 is four, and the four connecting parts 240 are respectively arranged around the baffle 220.

[0043] Further, the bottom plate 400 is provided with a plurality of second through holes 410, and the plurality of second through holes 410 are arranged in one-to-one correspondence with the plurality of first through holes 230.

[0044] In this embodiment, by providing a plurality of second through holes 410 corresponding to the first through holes 230 on the bottom plate 400, when the explosion-proof valve is activated due to thermal runaway of the battery cell 100, the ejected air flow and internal substances of the battery cell 100 can flow out through the first through hole 230 and the second through hole 410 in sequence.

[0045] Further, the battery pack 10 further includes a liquid collecting end plate 500, the liquid collecting end plate 500 is arranged at one end or both ends of the installation box 200, and a plurality of liquid cooling plates 300 penetrate through the installation box 200 and are communicated with the liquid collecting end plate 500, and the liquid collecting end plate 500 is used for inputting or outputting a heat exchange medium to the plurality of liquid cooling plates 300.

[0046] In this embodiment, the number of the liquid collecting end plates 500 is two, and the two liquid collecting end plates 500 are respectively arranged at both ends of the installation box 200 and are respectively connected to both ends of the liquid cooling plate 300, so as to realize inputting or outputting a heat exchange medium to the liquid cooling plate 300.

[0047] Further, the battery pack 10 further includes a tray 600 and fasteners, the installation box 200 is arranged on the tray 600, and the liquid collecting end plate 500 is connected to the tray 600 through the fasteners.

[0048] In this embodiment, the fastener can be a bolt. Therefore, the liquid collecting end plate 500 is fixed on the tray 600 through the bolt, and the liquid collecting end plate 500 is also connected to the installation box 200, thus ensuring the reliable connection of the battery cell 100 and improving the structural stability of the battery pack 10.

[0049] Further, a plurality of battery cells 100 are arranged in a staggered manner, and the liquid cooling plate 300 is at least partially attached to the adjacent battery cells 100.

[0050] In this embodiment, by arranging the installation grooves 210 of adjacent two rows in a staggered manner, so that the installed plurality of battery cells 100 are arranged in a staggered manner, thereby effectively utilizing the space of the tray 600 and maximizing the number of installed battery cells 100.

[0051] And by attaching the liquid cooling plate 300 to at least part of the battery cell 100, the contact area between the liquid cooling plate 300 and the battery cell 100 is increased, thereby effectively improving the heat exchange efficiency.

[0052] It can be understood that the staggered arrangement means that multiple mounting grooves 210 are arranged in multiple rows. Among the mounting grooves 210 in adjacent two rows, the mounting grooves 210 in one row correspond to the middle positions between two adjacent mounting grooves 210 in the other row.

[0053] Furthermore, the mounting box 200 is made by the thermoforming process; the bottom plate 400 is made of epoxy material.

[0054] In this embodiment, the thermoforming process is simple, and the cost of the formed thermoformed mounting box 200 is low; while the epoxy bottom plate 400 made of epoxy material has good high-temperature resistance and can continue to stably support the mounting box 200 in the case of thermal runaway of the battery cell 100.

[0055] Therefore, the cost of the thermoformed mounting box 200 and the epoxy bottom plate 400 is extremely low, significantly reducing the production cost of the battery pack 10.

[0056] In summary, the present utility model provides a battery pack 10. By respectively arranging multiple battery cells 100 in multiple mounting grooves 210, the battery cells 100 can be effectively fixed; and liquid cooling plates 300 are arranged on both sides of each row of battery cells 100 to achieve heat exchange with the battery cells 100. It can be seen that the battery pack 10 provided by the present utility model has a simple structure, can not only effectively fix multiple battery cells 100, but also effectively conduct heat exchange for the battery cells 100. Moreover, since the battery cells 100 are not directly bonded to the tray 600, during maintenance, only the single battery cell 100 to be repaired needs to be dug out by a special tool, which is convenient for maintenance and has low maintenance cost.

[0057] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that: Includes battery cells, mounting box and liquid cooling plate; The bottom wall of the installation box is provided with a plurality of installation grooves, the plurality of installation grooves are arranged in multiple rows, the number of the liquid cooling plates and the number of the battery cells are both multiple, the multiple battery cells and the multiple liquid cooling plates are both arranged in the installation box, and the battery cells are arranged in the installation grooves and located between two adjacent liquid cooling plates, and the liquid cooling plates are connected to the battery cells for heat exchange for the battery cells; The battery pack further includes a bottom plate, which is disposed at the bottom of the installation box and is used to support the installation box; The mounting box is provided with a baffle, the bottom wall of the mounting groove is provided with a first through hole, the edge of the baffle is provided with at least one connecting portion, at least one of the connecting portions is connected to the edge of the first through hole so that the baffle blocks the first through hole, and the connecting portion is used to break when the explosion-proof valve of the battery cell is opened so that the baffle is subjected to force.

2. The battery pack according to claim 1, characterized in that: The bottom plate is provided with a plurality of second through holes, and the plurality of second through holes are arranged in one-to-one correspondence with the plurality of first through holes.

3. The battery pack according to claim 1, characterized in that: The bottom plate and the installation box are bonded together by structural adhesive.

4. The battery pack according to claim 1, characterized in that: The battery pack also includes a liquid collecting end plate, which is arranged at one end or both ends of the installation box, and the multiple liquid cooling plates are all penetrated by the installation box and connected to the liquid collecting end plate, and the liquid collecting end plate is used to input or output heat exchange medium to the multiple liquid cooling plates.

5. The battery pack according to claim 4, characterized in that: The battery pack further includes a tray and a fastener, the mounting box is arranged on the tray, and the liquid collecting end plate is connected to the tray via the fastener.

6. The battery pack according to claim 1, characterized in that: The plurality of battery cells are arranged in a staggered manner, and the liquid cooling plate is in contact with at least a portion of the adjacent battery cells.

7. The battery pack according to claim 1, characterized in that: The installation box is made by adopting the blister process.

8. The battery pack according to claim 1, characterized in that: The bottom plate is made of epoxy material.

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