Battery pack and electric device

Abstract

The utility model relates to a battery pack and an electric device, the battery pack comprises a bottom shell, an upper cover and a battery cell module, the battery cell module comprises a plurality of side cold plates, and each single row of battery cells in the battery cell module are matched with the side cold plates on the two sides in a heat conduction manner. Therefore, the heat exchange area of the single battery cells in the single row of battery cells is larger, so that the cooling effect is better. And the front end plate and the rear end plate are matched, and the middle end plate can provide a powerful supporting effect on each single-row battery cell from the middle position, so that the structural stability of the battery cell module can be improved. The cross beam can enhance the structural strength of the bottom shell. Moreover, the middle end plate and the cross beam are fixedly arranged, so that stronger transverse support can be formed in the accommodating cavity through cooperation of the middle end plate and the cross beam, and the structural strength in the accommodating cavity can be improved. Therefore, the battery pack not only has a better heat dissipation effect, but also has higher overall structural strength.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a battery pack and an electric device. Background Art

[0002] As new energy vehicles become more popular, the improvement of battery fast charging capability has a greater impact on product competitiveness. The improvement of battery fast charging capability will cause the battery to heat up faster, and in severe cases it may cause thermal runaway, so higher requirements are also placed on the cooling performance of the battery. To this end, related companies have developed large-surface cooling technology, which is to set a cooling plate between the large surfaces of two adjacent rows of battery cells. In order to set up cooling plates between battery cells, batteries using large-surface cooling technology generally need to omit or reduce the support beams in the shell, resulting in a reduction in the overall structural strength. Utility Model Content

[0003] Based on this, it is necessary to provide a battery pack and an electrical device with better heat dissipation effect and higher structural strength to address the above problems.

[0004] A battery pack, comprising:

[0005] A bottom shell, the bottom wall of which is provided with a crossbeam;

[0006] An upper cover, which is disposed on the bottom shell and forms a receiving cavity between the bottom shell; and

[0007] A battery cell module, comprising a plurality of side cold plates, wherein the plurality of side cold plates are arranged at intervals and a receiving groove is formed between two adjacent side cold plates, each receiving groove is provided with a single-row battery cell that is thermally matched with the side cold plate, and each of the single-row battery cells is respectively provided with a front end plate and a rear end plate at both ends in the length direction, and at least one middle end plate is provided between the front end plate and the rear end plate;

[0008] The battery cell module is accommodated in the accommodating cavity, the middle end plate is fixed to the crossbeam, the side cold plates extend perpendicular to the crossbeam, and a groove for avoiding the crossbeam is formed on the edge of each side cold plate.

[0009] In one of the embodiments, the bottom wall of the bottom shell is provided with a longitudinal beam perpendicular to the cross beam, and the longitudinal beam is located between two adjacent battery core modules.

[0010] In one of the embodiments, a plurality of the middle end plates are provided in each of the single-row battery cells, and a distance between two adjacent middle end plates is 400 mm to 800 mm.

[0011] In one of the embodiments, a mounting structure is further included, and the mounting structure passes through the upper cover, the middle end plate, the cross beam and the bottom shell and is locked.

[0012] In one of the embodiments, the front end plate, the rear end plate and the middle end plate of each of the single-row battery cells are fixedly connected to the side cold plates on both sides of the single-row battery cells.

[0013] In one of the embodiments, each of the side cold plates is provided with rivet holes at positions corresponding to the front end plate, the rear end plate and the middle end plate, and the side cold plates are riveted and fixed to the front end plate, the rear end plate and the middle end plate through the rivet holes.

[0014] In one of the embodiments, a bottom cooling plate is provided on the bottom wall of the bottom shell, the battery cell module is thermally matched with the bottom cooling plate, and the cooling channel of the bottom cooling plate is connected with the cooling channel of the side cooling plate.

[0015] In one of the embodiments, thermal conductive adhesive is provided between the battery core module and the bottom cooling plate.

[0016] In one embodiment, the water inlet and the water outlet of the side cooling plate are located at the same end in the length direction of the side cooling plate, and are located at the same end of the receiving tank as the water inlet and the water outlet of the bottom cooling plate.

[0017] An electrical device comprises a battery pack as described in any one of the preferred embodiments above.

[0018] The battery pack mentioned above, its cell module includes multiple side cold plates, and each single-row cell in the cell module is thermally coordinated with the side cold plates on both sides. Therefore, the cell monomers in the single-row cells have a larger area for heat exchange, so the cooling effect is better. In conjunction with the front end plate and the rear end plate, the middle end plate can also provide strong support for each single-row cell from the middle position, thereby improving the structural stability of the cell module. The crossbeam can enhance the structural strength of the bottom shell. Moreover, since the middle end plate and the crossbeam are fixedly arranged, the cooperation between the two can form a stronger lateral support inside the accommodating cavity, thereby improving the structural strength inside the accommodating cavity. It can be seen that the above-mentioned battery pack not only has a better heat dissipation effect, but also has a higher overall structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of a battery pack in a preferred embodiment of the utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of the bottom shell of the battery pack shown;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of the battery cell module in the battery pack shown;

[0023] Figure 4 for Figure 3 An exploded view of the battery module is shown.

[0024] Figure 5 for Figure 1 A top view of the battery pack shown;

[0025] Figure 6 for Figure 5 The battery pack is shown in a cross-sectional view along AA. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0032] The utility model discloses an electric device and a battery pack, wherein the electric device includes the battery pack and can be provided with electric energy by the battery pack. The battery pack can be used alone or multiple battery packs can be connected in parallel, in series, or in combination of parallel and series to form a larger battery pack for use.

[0033] The above-mentioned electrical devices can be vehicles, ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include aircraft, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, jumping machines, etc.

[0034] This application does not impose any special restrictions on the above-mentioned power-consuming device. For new energy vehicles, the above-mentioned battery pack can be used as a driving power source, thereby replacing fossil fuels to provide driving power.

[0035] See also Figure 1 and Figure 2 The battery pack 10 in the preferred embodiment of the present invention includes a bottom shell 100 , an upper cover 200 and a battery cell module 300 .

[0036] The bottom shell 100 is generally a hollow structure with an opening on one side, and its outer contour can be rectangular, circular or other shapes that are compatible with the battery compartment of the electrical device. The bottom wall of the bottom shell 100 is provided with a crossbeam 110 to strengthen the structural strength of the bottom shell 100. Specifically, the crossbeam 110 can be fixed to the bottom wall of the bottom shell 100 by welding, or it can be integrally formed with the bottom wall of the bottom shell 100. The crossbeam 110 adopts a short beam structure, and its height is less than the depth of the bottom shell 100, that is, the distance between the bottom wall of the bottom shell 100 and the opening.

[0037] The upper cover 200 is disposed on the bottom shell 100, and a receiving cavity for receiving the battery cell module 300 is formed between the upper cover 200 and the bottom shell 100. The upper cover 200 may also be a hollow structure with one side open, and the upper cover 200 and the open side of the bottom shell 100 are arranged opposite to each other, so as to form a closed cavity structure between the two. In addition, the upper cover 200 and the bottom shell 100 may be matched by bolt connection, clamping, riveting, welding, etc.

[0038] The cell module 300 is a core component of the battery pack 10, which includes multiple cell monomers for storing and releasing electrical energy. One or more cell modules 300 can be provided, and in order to obtain a larger battery capacity, multiple cell modules 300 are generally provided in the battery pack 10. For example, in this embodiment, there are two cell modules 300, and the two cell modules 300 are arranged side by side along the extension direction of the crossbeam 110.

[0039] In this embodiment, the bottom wall of the bottom shell 100 is provided with a longitudinal beam 120 perpendicular to the cross beam 110, and the longitudinal beam 120 is located between two adjacent battery modules 300. Since a plurality of battery modules 300 are provided, the size of the bottom shell 100 also needs to be increased accordingly, resulting in a decrease in the structural strength of the bottom shell 100. The longitudinal beam 120 cooperates with the cross beam 110 to further strengthen the structural strength of the bottom shell 100, thereby improving the overall structural strength of the battery pack 10. The height of the longitudinal beam 120 is generally consistent with the depth of the bottom shell 100, which is greater than the height of the cross beam 110.

[0040] Please also read Figure 3 and Figure 4 The battery cell module 300 includes a side cold plate 310 , a single row of battery cells 320 , a front end plate 330 , a rear end plate 340 and a middle end plate 350 .

[0041] The single-row battery cell 320 includes a plurality of battery cells arranged in parallel, and the battery cell may be a lithium-ion battery, and its shape may be a cylinder or a cuboid. The battery cell in this embodiment is a cuboid lithium-ion battery, and the large surfaces of the plurality of battery cells are arranged in sequence. Each battery cell module 300 generally includes a plurality of, for example, two, single-row battery cells 320. A front end plate 330 and a rear end plate 340 are respectively provided at both ends of the length direction of each single-row battery cell 320, and at least one middle end plate 350 is provided between the front end plate 330 and the rear end plate 340. The front end plate 330 and the rear end plate 340 have the same structure, and a plurality of battery cells are clamped therebetween. Each middle end plate 150 is arranged between two adjacent battery cells, and the middle end plate 150 cooperates with the front end plate 330 and the rear end plate 340 to provide strong support to each single-row battery cell 320 from the middle position, thereby improving the structural stability of the battery cell module 300.

[0042] In order to improve the supporting effect of the middle end plate 150 , specifically in the present embodiment, a plurality of middle end plates 150 are arranged in the single row of battery cells 320 , and the distance between two adjacent middle end plates 150 is 400 mm to 800 mm.

[0043] There are multiple side cold plates 310, and the multiple side cold plates 310 are arranged at intervals and form a receiving groove (not shown) between two adjacent side cold plates 310. A cooling channel is arranged inside the side cold plate 310, and the coolant can flow through the cooling channel. The side cold plate 310 is in an elongated strip shape, which is consistent with the extension direction of the single-row battery cell 320. A single-row battery cell 320 that is thermally matched with the side cold plate 310 is arranged in each receiving groove. Thermal matching means that heat exchange can be carried out between the single-row battery cell 320 and the side cold plate 310, and the single-row battery cell 320 and the side cold plate 310 can be directly in contact to achieve thermal matching, or can be thermally matched with the side cold plate 310 through thermal conductive components such as thermal conductive glue.

[0044] It can be seen that the two side surfaces adjacent to the large surface of each battery cell in the single-row battery cells 320 can exchange heat with the side cold plate 310, so the area of ​​heat exchange between the battery cell and the side cold plate 310 is larger, so that the battery cell module 300 dissipates heat faster and the cooling effect of the battery pack 10 is better.

[0045] Also, please refer again to Figure 1 In the present embodiment, the bottom wall of the bottom shell 100 is provided with a bottom cooling plate 400, and the battery cell module 300 cooperates with the bottom cooling plate 400 in a heat-conducting manner. Similarly, a cooling channel for the coolant to pass through is formed inside the bottom cooling plate 400. The bottom cooling plate 400 can be arranged on the bottom wall of the bottom shell 100 by welding, etc. It can be seen that the bottom surface of each battery cell in the single-row battery cells 320 can exchange heat with the bottom cooling plate 400, so the heat dissipation area of ​​the battery cell is further increased, thereby further improving the heat dissipation effect of the battery cell module 300.

[0046] Furthermore, in this embodiment, a thermally conductive adhesive is provided between the battery cell module 300 and the bottom cooling plate 400. The thermally conductive adhesive has better thermal conductivity, thereby improving the heat exchange efficiency between the battery cell and the bottom cooling plate 400. Moreover, the thermally conductive adhesive can also play a bonding and fixing role on the battery cell module 300, thereby improving the stability of the battery cell module 300 in the accommodation cavity.

[0047] Specifically, in this embodiment, the cooling channel of the bottom cooling plate 400 is connected to the cooling channel of the side cooling plate 310. Therefore, the coolant flowing through the bottom cooling plate 400 can be exchanged with the coolant flowing through the side cooling plate 310, so as to achieve a uniform temperature effect between the bottom cooling plate 400 and the side cooling plate 310, which helps to keep the temperature of the battery cells in the battery cell module 200 at a high consistency.

[0048] In addition, in this embodiment, the water inlet and outlet of the side cold plate 310 are located at the same end in the length direction of the side cold plate 310, and are located at the same end of the receiving tank as the water inlet and outlet of the bottom cooling plate 400. The coolant flowing out of the water outlet of the side cold plate 310 can enter the cooling channel of the plate cooling plate 400 through the water inlet of the bottom cooling plate 400, so as to realize the exchange of coolant between the bottom cooling plate 400 and the side cold plate 310. Moreover, since the water inlet and outlet to be connected are located at the same end and the distance is short, the connection is more convenient and it is also conducive to saving space.

[0049] The cell module 300 is accommodated in the accommodating cavity, and the middle end plate 350 is fixed to the cross beam 110. When the assembled cell module 300 is placed on the bottom shell 100, the middle end plate 350 extends in the same direction as the cross beam 110, and the side cold plate 310 extends in a direction perpendicular to the cross beam 110.

[0050] Please refer again Figure 3 and Figure 4 In order to avoid the cross beam 110, a groove 311 is formed at the edge of each side cold plate 310, and the cross beam 110 is clamped in the groove 311 of the side cold plate 310. The height of the middle end plate 350 is less than the height of the front plate 330 and the rear plate 340, and the sum of the height of the middle end 350 and the cross beam 110 is not greater than the depth of the bottom shell 100, so the middle end plate 350 will not protrude outside the bottom shell 100 when stacked on the cross beam 110.

[0051] The middle end plate 350 and the cross beam 110 are stacked, and the combination of the two is equivalent to a traditional cross beam structure, so a stronger lateral support can be formed inside the accommodating cavity, thereby improving the structural strength inside the accommodating cavity. In addition, the middle end 350 and the cross beam 110 share space in the depth direction of the bottom shell 100, so it can also avoid the reduction of space utilization due to the extra space occupied by the cross beam 110.

[0052] In this embodiment, the front end plate 330, the rear end plate 340 and the middle end plate 350 of each single-row battery cell 320 are fixedly connected to the side cold plates 310 on both sides of the single-row battery cell 320. In this way, the battery cell module 300 can form a more stable overall structure. The middle end plate 350 can provide a strong support in the middle and can also cooperate with the side cold plates 310 to limit the multiple battery cells in the single-row battery cell 320 to prevent some battery cells from bulging or sinking, thereby effectively controlling the flatness of the large surface of the battery cell module 300.

[0053] In order to further improve the stability of the battery cell module 300 in the accommodating cavity, the front end plate 330 and the rear end plate 340 of each single-row battery cell 320 may also be fastened to the bottom cooling plate 400 or the bottom wall of the bottom shell 100 by bolts.

[0054] Furthermore, in this embodiment, each side cold plate 310 is provided with a rivet hole 312 at a position corresponding to the front end plate 330, the rear end plate 340 and the middle end plate 350, and the side cold plate 310 is riveted and fixed to the front end plate 330, the rear end plate 340 and the middle end plate 350 through the rivet hole 312. Riveting fixation is more convenient and has a simpler structure, which is conducive to reducing the mass of the battery module 300 and improving space utilization.

[0055] Please also read Figure 5 and Figure 6In this embodiment, the battery pack 10 further includes a mounting structure 500. The mounting structure 500 penetrates the upper cover 200, the middle end plate 350, the crossbeam 110 and the bottom shell 100 and is locked. When the battery pack 10 is assembled on an electrical device, such as a new energy vehicle, the hanging bolts on the vehicle can be connected to the mounting structure 500. Moreover, since the point used for hanging utilizes the space where the middle end plate 350 is located, the space required for the traditional hanging point is reduced, which is conducive to further improving the space utilization rate.

[0056] A plurality of mounting structures 500 may be provided, and the plurality of mounting structures 500 are generally arranged at intervals along the extension direction of the same crossbeam 110. In this way, a plurality of hanging bolts may be used to assemble the battery pack 10, and the battery pack 10 may be hung more firmly.

[0057] In the battery pack 10, the cell module 300 includes a plurality of side cold plates 310, and each single-row cell 320 in the cell module 300 is thermally coordinated with the side cold plates 310 on both sides. Therefore, the cell monomers in the single-row cell 320 have a larger area for heat exchange, so the cooling effect is better. In conjunction with the front end plate 330 and the rear end plate 340, the middle end plate 350 can also provide strong support for each single-row cell 320 from the middle position, thereby improving the structural stability of the cell module 300. The crossbeam 110 can enhance the structural strength of the bottom shell 100. Moreover, since the middle end plate 350 and the crossbeam 110 are fixedly arranged, the cooperation between the two can form a stronger lateral support inside the accommodating cavity, thereby improving the structural strength inside the accommodating cavity. It can be seen that the battery pack 10 not only has a better heat dissipation effect, but also has a higher overall structural strength.

[0058] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A battery pack, characterized in that: include: A bottom shell, the bottom wall of which is provided with a crossbeam; An upper cover, which is disposed on the bottom shell and forms a receiving cavity between the bottom shell; and A battery cell module, comprising a plurality of side cold plates, wherein the plurality of side cold plates are arranged at intervals and a receiving groove is formed between two adjacent side cold plates, each receiving groove is provided with a single-row battery cell that is thermally matched with the side cold plate, and each of the single-row battery cells is respectively provided with a front end plate and a rear end plate at both ends in the length direction, and at least one middle end plate is provided between the front end plate and the rear end plate; The battery cell module is accommodated in the accommodating cavity, the middle end plate is fixed to the crossbeam, the side cold plates extend perpendicular to the crossbeam, and a groove for avoiding the crossbeam is formed on the edge of each side cold plate.

2. The battery pack according to claim 1, characterized in that: The bottom wall of the bottom shell is provided with a longitudinal beam perpendicular to the cross beam, and the longitudinal beam is located between two adjacent battery core modules.

3. The battery pack according to claim 1, characterized in that: A plurality of the middle end plates are arranged in each of the single-row battery cells, and the spacing between two adjacent middle end plates is 400 mm to 800 mm.

4. The battery pack according to claim 1, characterized in that: It also includes a mounting structure, which passes through the upper cover, the middle end plate, the crossbeam and the bottom shell and is locked.

5. The battery pack according to claim 1, characterized in that: The front end plate, the rear end plate and the middle end plate of each of the single-row battery cells are fixedly connected to the side cold plates on both sides of the single-row battery cells.

6. The battery pack according to claim 5, characterized in that: Each of the side cold plates is provided with rivet holes at positions corresponding to the front end plate, the rear end plate and the middle end plate, and the side cold plates are riveted and fixed to the front end plate, the rear end plate and the middle end plate through the rivet holes.

7. The battery pack according to claim 1, characterized in that: The bottom wall of the bottom shell is provided with a bottom cooling plate, the battery core module is thermally matched with the bottom cooling plate, and the cooling channel of the bottom cooling plate is connected with the cooling channel of the side cooling plate.

8. The battery pack according to claim 7, characterized in that: Thermally conductive adhesive is arranged between the battery core module and the bottom cooling plate.

9. The battery pack according to claim 7, characterized in that: The water inlet and the water outlet of the side cooling plate are located at the same end in the length direction of the side cooling plate, and are located at the same end of the containing tank as the water inlet and the water outlet of the bottom cooling plate.

10. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 9.

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