Battery pack

Abstract

The utility model provides a battery pack which comprises a box body and at least two battery core stacking bodies located in the box body, a first end plate and a second end plate are arranged at the two ends of each battery core stacking body respectively, a first supporting layer is arranged between the first end plates of every two adjacent battery core stacking bodies, and a second supporting layer is arranged between the second end plates of every two adjacent battery core stacking bodies. A first supporting layer is arranged between the first end plates of the two adjacent battery cell stacks, a second supporting layer is arranged between the second end plates of the two adjacent battery cell stacks, and an adhesive layer is arranged between the first supporting layer and the second supporting layer, so that the connection between the two first end plates is realized and the rigidity between the two first end plates is improved by arranging the first supporting layer; the connection between the two second end plates is realized and the rigidity between the two second end plates is improved by arranging the second supporting layer, and the connection between the side walls of the two battery core stacking bodies is realized and the rigidity between the two side walls is improved by arranging the adhesive layer, so that the connection between the two adjacent battery core stacking bodies can be realized; and the rigidity of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a battery pack. BACKGROUND

[0002] The battery pack usually includes a plurality of cell stacks, and the plurality of cell stacks are sequentially stacked in a certain order, and each cell stack is provided with an end plate at both ends. In order to ensure the structural stability of the battery pack, it is usually necessary to connect adjacent cell stacks to achieve the two-by-two fixation of the cell stacks. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to provide a battery pack to solve the problem of insufficient rigidity of the battery pack.

[0004] To achieve the above purpose, the first aspect of the present application provides a battery pack, comprising: a box body and at least two cell stacks located in the box body, each cell stack comprising a plurality of cells stacked along a first direction, the at least two cell stacks being arranged adjacent to each other along a second direction perpendicular to the first direction, each cell stack being provided with a first end plate and a second end plate at both ends, respectively, a first support layer being provided between the two first end plates corresponding to the adjacent two cell stacks, a second support layer being provided between the two second end plates corresponding to the adjacent two cell stacks, and a glue layer being provided between the first support layer and the second support layer.

[0005] Optionally, the glue layer extends along the length direction of the cell stack.

[0006] Optionally, the first support layer and the second support layer are both connected with the bottom plate of the box body, and the first support layer, the second support layer and the bottom plate jointly define a first glue filling area, and the glue layer is provided in the first glue filling area.

[0007] Optionally, the first glue filling area comprises a first sub-area and a second sub-area, each cell stack comprises two sub-stacks, each sub-stack comprises a plurality of cells, a middle plate is provided between the two sub-stacks, a third support layer is provided between the two middle plates corresponding to the adjacent two cell stacks, the third support layer is connected with the bottom plate of the box body, the first support layer, the third support layer and the bottom plate jointly define the first sub-area, and the second support layer, the third support layer and the bottom plate jointly define the second sub-area.

[0008] Optionally, a fourth support layer is arranged between the side walls of two adjacent battery cell stacks, the fourth support layer extends along the length direction of the battery cell stack and is connected with the first support layer and the second support layer, and the first support layer, the second support layer and the fourth support layer jointly define a second glue filling area, and the glue layer is arranged in the second glue filling area.

[0009] Optionally, the second glue filling area includes a third sub-area and a fourth sub-area, each battery cell stack includes two sub-stacks, each sub-stack includes a plurality of battery cells, a middle plate is arranged between the two sub-stacks, a third support layer is arranged between the two middle plates corresponding to two adjacent battery cell stacks, the third support layer is connected with the fourth support layer, the first support layer, the third support layer and the fourth support layer jointly define the third sub-area, and the second support layer, the third support layer and the fourth support layer jointly define the fourth sub-area.

[0010] Optionally, the height of the glue layer is greater than or equal to 1 / 5 of the height of the battery cell stack.

[0011] Optionally, the bottom of the first support layer and the second support layer is connected with the bottom plate of the box.

[0012] Optionally, the top of the first support layer, the second support layer and / or the third support layer is flush with the top surface of the battery cell stack.

[0013] Optionally, the first support layer, the second support layer, the third support layer and / or the fourth support layer is a foam layer, and the glue layer is a foaming glue layer.

[0014] Optionally, a locking support is further included, the locking support is connected with the top of the first end plate and the second end plate, the first end plates of two adjacent battery cell stacks are connected through the locking support, and the second end plates of two adjacent battery cell stacks are connected through the locking support.

[0015] It can be seen from the above that the battery pack provided in the application includes a box body and at least two cell stacks in the box body, two ends of each cell stack are respectively provided with a first end plate and a second end plate, a first support layer is arranged between the first end plates of the adjacent two cell stacks, a second support layer is arranged between the second end plates of the adjacent two cell stacks, and a glue layer is arranged between the first support layer and the second support layer. The first support layer is arranged to realize the connection between the two first end plates and improve the rigidity between the two first end plates, the second support layer is arranged to realize the connection between the two second end plates and improve the rigidity between the two second end plates, and the glue layer is arranged to realize the connection between the side walls of the two cell stacks and improve the rigidity between the two side walls. In this way, the connection between the adjacent two cell stacks can be realized, and the rigidity of the battery pack can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] 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 the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0017] Figure 1A A schematic diagram of a battery pack in the related art is shown;

[0018] Figure 1B A first local enlarged schematic diagram of a battery pack in the related art is shown;

[0019] Figure 1C A second local enlarged schematic diagram of a battery pack in the related art is shown;

[0020] Figure 1D A second local enlarged schematic diagram of a battery pack in the related art is shown after removing the locking assembly;

[0021] Figure 2 A schematic diagram of a first embodiment of a battery pack of the present application is shown;

[0022] Figure 3 A first local enlarged schematic diagram of a battery pack in the related art is shown; Figure 2

[0023] Figure 4 A second local enlarged schematic diagram of a battery pack in the related art is shown; Figure 2

[0024] Figure 5 A D-D cross-sectional schematic diagram of a first embodiment of a battery pack of the present application is shown;

[0025] Figure 6 ​​A cross-sectional view of a second embodiment of the battery pack of the present application is shown.

[0026] Figure 7 A cross-sectional view of a third embodiment of the battery pack of the present application is shown. Figure 2 A partial enlarged view of the middle F is shown.

[0027] Figure 8 A cross-sectional view of a third embodiment of the battery pack of the present application is shown.

[0028] Figure 9 A cross-sectional view of a third embodiment of the battery pack of the present application is shown.

[0029] Figure 10 A cross-sectional view of a fourth embodiment of the battery pack of the present application is shown.

[0030] Figure 11 A cross-sectional view of a fourth embodiment of the battery pack of the present application is shown.

[0031] Figure 12 A cross-sectional view of a fifth embodiment of the battery pack of the present application is shown.

[0032] Figure 13 A cross-sectional view of a fifth embodiment of the battery pack of the present application is shown.

[0033] Figure 14 A cross-sectional view of a sixth embodiment of the battery pack of the present application is shown.

[0034] Figure 15 A partial enlarged view of a seventh embodiment of the battery pack of the present application is shown.

[0035] In the figure: 1, box body; 101, bottom plate; 2, cell stack; 3, first support layer; 4, second support layer; 5, first glue filling area; 51, first sub-area; 52, second sub-area; 6, third support layer; 7, fourth support layer; 8, second glue filling area; 81, third sub-area; 82, fourth sub-area; 9, glue layer; 10, locking bracket; 11, end plate; 11a, first end plate; 11b, second end plate; 12, middle plate;

[0036] 01, first gap; 02, second gap; 03, glue strip; 04, locking assembly. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0038] For ease of description, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those skilled in the art to which the present application belongs, unless otherwise defined. The terms "first", "second", and similar terms used in the present application do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0039] The battery pack usually includes a plurality of cell stack bodies 2, which are sequentially stacked in a certain order, and each cell stack body 2 is provided with an end plate 11 at both ends. In order to ensure the structural stability of the battery pack, it is usually necessary to connect a plurality of cell stack bodies 2 to achieve the relative fixation between the plurality of cell stack bodies 2.

[0040] Figure 1A A schematic diagram of a battery pack in the related art is shown, Figure 1B An enlarged schematic diagram of a first part of the battery pack in the related art is shown, Figure 1C An enlarged schematic diagram of a second part of the battery pack in the related art is shown.

[0041] Referring to Figure 1A , Figure 1B and Figure 1C , in the related art, the position where the two adjacent cell stack bodies 2 are not provided with the end plate 11 is connected by the adhesive tape 03, and the position where the two adjacent cell stack bodies 2 are provided with the end plate 11 is connected by the locking assembly 04, thereby achieving the fixation of the cell stack bodies 2 two by two.

[0042] However, referring to Figure 1A , at the position where the cell stack body 2 is not provided with the end plate 11, even if the two adjacent cell stack bodies 2 are connected by the adhesive tape 03, the adhesive tape 03 can only connect the top of the two cell stack bodies 2, and there is still a large first gap 01 between the side walls of the two cell stack bodies 2. The existence of the first gap 01 makes the side walls of the two cell stack bodies 2 not well supported, resulting in insufficient overall rigidity of the battery pack.

[0043] Figure 1D An enlarged schematic diagram of a second part of the battery pack in the related art after removing the locking assembly 04 is shown.

[0044] Referring toFigure 1C and Figure 1D As shown, at the position where the end plate 11 is set in the battery cell stack 2, even if the end plates 11 of two adjacent battery cell stacks 2 are connected by a locking component 04, the locking component 04 can only connect the tops of the two end plates 11, and there is still a larger second gap 02 between the side walls of the two end plates 11. The existence of the second gap 02 makes it impossible to have good support between the end plates 11 of the two battery cell stacks 2, resulting in insufficient overall rigidity of the battery pack.

[0045] Therefore, how to further improve the rigidity of the battery pack while achieving fixation of adjacent battery cell stacks 2 is an issue that needs to be addressed urgently.

[0046] Based on this, the present application provides a battery pack that can improve the rigidity of the battery pack while achieving fixation of adjacent battery cell stacks 2.

[0047] Figure 2 A schematic diagram showing a first embodiment of the battery pack of the present application is shown. Figure 3 Shown Figure 2 A partial enlarged schematic diagram of E in the middle, Figure 4 Shown Figure 2 A partial enlarged schematic diagram of G in the middle. Figure 5 A DD cross-sectional schematic diagram of the first embodiment of the battery pack of the present application is shown.

[0048] See also Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the battery pack includes a box body 1 and at least two battery cell stacks 2 located in the box body 1, each battery cell stack 2 includes a first direction (ie Figure 2 The plurality of battery cells 211 are stacked in a direction indicated by R in FIG. 1 , and the at least two battery cell stacks 2 are stacked in a second direction perpendicular to the first direction (ie Figure 2 A first end plate 11a and a second end plate 11b are respectively provided at both ends of each battery cell stack 2, a first support layer 3 is provided between the first end plates 11a of the two adjacent battery cell stacks 2, a second support layer 4 is provided between the second end plates 11b of the two adjacent battery cell stacks 2, and a glue layer 9 is provided between the first support layer 3 and the second support layer 4.

[0049] Specifically, the box body 1 is a hollow structure with an open top. The hollow portion of the box body 1 is used to accommodate at least two battery cell stacks 2. The at least two battery cell stacks 2 are stacked in a certain order. The top opening of the box body 1 can be sealed by a structure such as an upper cover (not shown).

[0050] The two ends of each battery cell stack 2 are respectively provided with a first end plate 11a and a second end plate 11b. Exemplarily, the first end plate 11a is arranged at one end of the battery cell stack 2, and the second end plate 11b is arranged at the other end of the battery cell stack 2. The first end plate 11a and the second end plate 11b are respectively arranged at the two ends of the battery cell stack 2 to protect and fix the battery cell stack 2, and provide a certain installation pre-tightening force in the first direction.

[0051] The first end plates 11a of the two adjacent battery cell stacks 2 are provided with a first support layer 3, and the first support layer 3 is connected with the two first end plates 11a. Exemplarily, the first support layer 3 can be directly bonded with the first end plate 11a or interference fit with the first end plate 11a. The specific connection mode of the first support layer 3 and the first end plate 11a is not limited in the embodiment, as long as the first support layer 3 can form an effective and firm connection between the two first end plates 11a.

[0052] The first support layer 3 can connect the two first end plates 11a, and can also fill the original gap between the two first end plates 11a to provide effective support for the two first end plates 11a, thereby improving the overall rigidity of the battery pack.

[0053] The second end plates 11b of the two adjacent battery cell stacks 2 are provided with a second support layer 4, and the second support layer 4 is connected with the two second end plates 11b. Exemplarily, the second support layer 4 can be directly bonded with the second end plate 11b or interference fit with the second end plate 11b. The specific connection mode of the second support layer 4 and the second end plate 11b is not limited in the embodiment, as long as the second support layer 4 can form an effective and firm connection between the two second end plates 11b.

[0054] The second support layer 4 can connect the two second end plates 11b, and can also fill the original gap between the two second end plates 11b, thereby providing effective support for the two second end plates 11b, and improving the overall rigidity of the battery pack.

[0055] The first support layer 3 and the second support layer 4 are provided with a glue layer 9, which can connect the opposite side walls of the two battery cell stacks 2, and can also fill the gap between the opposite side walls of the two battery cell stacks 2 to provide effective support between the side walls of the two battery cell stacks 2, thereby improving the overall rigidity of the battery pack.

[0056] In the present application, the first support layer 3 is arranged to connect and improve the rigidity between the two first end plates 11a, the second support layer 4 is arranged to connect and improve the rigidity between the two second end plates 11b, and the glue layer 9 is arranged to connect and improve the rigidity between the side walls of the two cell stack 2. In this way, the connection between the adjacent two cell stack 2 can be realized, and the rigidity of the battery pack can be improved.

[0057] In some embodiments, referring back to Figure 5 , the glue layer 9 extends along the length direction of the cell stack 2. In this way, the glue layer 9 can cover the entire length direction of the cell stack 2, and then the gap between the side walls of the adjacent two cell stack 2 can be filled, and the side walls of the two cell stack 2 can be provided with significant support, and then the overall rigidity of the battery pack can be improved.

[0058] Figure 6 A cross-sectional view of a second embodiment of the battery pack of the present application is shown.

[0059] Referring back to Figure 5 and Figure 6 , in some embodiments, the first support layer 3 and the second support layer 4 are both connected with the bottom plate 101 of the box 1, and the first support layer 3, the second support layer 4 and the bottom plate 101 jointly define a first glue pouring area 5, and the glue layer 9 is arranged in the first glue pouring area 5.

[0060] Specifically, the first support layer 3 and the second support layer 4 both extend along the height direction of the cell stack 2, so that the first support layer 3 and the second support layer 4 are both connected with the bottom plate 101 of the box 1. In this way, the first support layer 3 and the second support layer 4 can fill all the gaps between the two first end plates 11a and the two second end plates 11b, and effectively support the two first end plates 11a and the two second end plates 11b, so as to effectively improve the rigidity of the battery pack.

[0061] The first support layer 3, the second support layer 4 and the bottom plate 101 jointly define a first glue pouring area 5. The first glue pouring area 5 is a region with two side faces and a bottom face sealed and an open top, which is convenient for accommodating the poured glue, for example, the region can accommodate the poured foam glue, and the foam glue is solidified after being poured into the region in the form of liquid, and finally forms the glue layer 9. At the same time, the first support layer 3, the second support layer 4 and the bottom plate 101 can also limit the glue (such as foam glue) in the first glue pouring area 5, prevent the glue from overflowing, and avoid the influence of the glue on the performance of the cell stack 2.

[0062] In some embodiments, referring back to Figure 6As shown, each of the cell stack 2 includes two sub-stacks 21, each of the sub-stacks 21 includes a plurality of cells 211, and a middle plate 12 is arranged between the two sub-stacks 21. In some cases, in order to improve the performance of the cells, the middle plate 12 is provided as a hollow structure (the hollow part is not shown in the figure), but the hollow part will cause the glue injected into the first glue filling area 5 to overflow into the cell stack 2, which may affect the performance of the cell stack 2.

[0063] Based on this, Figure 7 As shown Figure 2 A local enlarged view of the middle F is shown, Figure 8 A first cross-sectional view of a third embodiment of the battery pack of the present embodiment is shown, Figure 9 A second cross-sectional view of a third embodiment of the battery pack of the present embodiment is shown.

[0064] Referring to Figure 7 , Figure 8 and Figure 9 As shown, in some embodiments, the first glue filling area 5 includes a first sub-area 51 and a second sub-area 52, a third support layer 6 is arranged between the two middle plates 12 corresponding to the two adjacent cell stacks 2, the third support layer 6 is connected with the bottom plate 101 of the box 1, the first support layer 3, the third support layer 6 and the bottom plate 101 together define the first sub-area 51, and the second support layer 4, the third support layer 6 and the bottom plate 101 together define the second sub-area 52.

[0065] Specifically, the third support layer 6 is arranged between the middle plates 12 of the two adjacent cell stacks 2, which can connect the two middle plates 12 and fill the original gap between the two middle plates 12, thereby providing effective support for the two middle plates 12 and improving the overall rigidity of the battery pack.

[0066] The third support layer 6 is arranged between the middle plates 12 of the two adjacent cell stacks 2 and is connected with the two middle plates 12. Exemplarily, the third support layer 6 can be directly bonded with the middle plate 12 or interference fit with the middle plate 12, and the present embodiment does not limit the specific connection mode of the third support layer 6 and the middle plate 12, as long as it can ensure that the third support layer 6 can form an effective and firm connection between the two middle plates 12.

[0067] The third support layer 6 is connected with the bottom plate 101 of the box body 1, the first support layer 3, the third support layer 6 and the bottom plate 101 jointly define the first sub-area 51, the second support layer 4, the third support layer 6 and the bottom plate 101 jointly define the second sub-area 52, and thus, since the third support layer 6 can shield the hollow part on the middle plate 12, the glue poured into the first sub-area 51 and the second sub-area 52 is prevented from overflowing from the hollow part on the middle plate 12 into the electric core stack 2, and the performance of the whole electric core stack is ensured.

[0068] Figure 10 Fig. 1 shows a first cross-sectional view of a fourth embodiment of the battery pack of the present embodiment, Figure 11 Fig. 2 shows a second cross-sectional view of the fourth embodiment of the battery pack of the present embodiment.

[0069] Referring to Figure 10 and Figure 11 In some embodiments, a fourth support layer 7 is further arranged between the side walls of two adjacent electric core stacks 2, the fourth support layer 7 extends along the length direction of the electric core stack 2 and is connected with the first support layer 3 and the second support layer 4, the first support layer 3, the second support layer 4 and the fourth support layer 7 jointly define a second glue pouring area 8, and a glue layer 9 is arranged in the second glue pouring area 8.

[0070] Specifically, the second glue pouring area 8 is an area with two side faces and a bottom being sealed and a top being open, which is convenient for accommodating the poured glue, and meanwhile, the first support layer 3, the second support layer 4 and the fourth support layer 7 can also limit the glue in the second glue pouring area 8 to prevent the glue from overflowing, so as to avoid the influence of the glue on the performance of the electric core stack 2.

[0071] In the present embodiment, since the fourth support layer 7 is connected with the side wall of the electric core stack 2, the area of the second glue pouring area 8 jointly defined by the first support layer 3, the second support layer 4 and the fourth support layer 7 is smaller than the area of the first glue pouring area 5 jointly defined by the first support layer 3, the second support layer 4 and the bottom plate 101, and thus, the amount of the glue poured into the second glue pouring area 8 is less than the amount of the glue poured into the first glue pouring area 5, and the area of the glue layer 9 formed in the second glue pouring area 8 is also smaller than the area of the glue layer 9 formed in the first glue pouring area 5, and different areas of the glue layer 9 can produce different rigidity improving effects on the battery pack.

[0072] In this way, by adjusting the area of the second glue pouring area 8, the area of the glue layer 9 formed in the second glue pouring area 8 can be adjusted, and thus, the adjusting effect of the glue layer 9 on the rigidity between the two electric core stacks 2 can be adjusted, so as to adjust the rigidity of the battery pack according to actual needs.

[0073] Exemplarily, when the rigidity of the battery pack required is large, the area of the second glue-filling region 8 is regulated to be large, so as to increase the rigidity-improving effect of the glue layer 9 formed in the second glue-filling region 8 on the battery pack; when the rigidity of the battery pack required is small, the area of the second glue-filling region 8 is regulated to be small, so as to reduce the rigidity-improving effect of the glue layer 9 formed in the second glue-filling region 8 on the battery pack.

[0074] In some embodiments, continuing to refer to Figure 6 As shown, each of the cell stack 2 includes two sub-stacks 21, each of the sub-stacks 21 includes a plurality of cells 211, and a middle plate 12 is arranged between the two sub-stacks 21. In some cases, in order to improve the performance of the cells, the middle plate 12 is arranged in a hollow structure (the hollow part is not shown in the figure), but the hollow part will cause the glue injected into the first glue-filling region 5 to overflow into the cell stack 2, which may affect the performance of the cell stack 2.

[0075] Based on this, Figure 12 A first cross-sectional schematic view of a fifth embodiment of the battery pack of the present embodiment is shown, Figure 13 A second cross-sectional schematic view of the fifth embodiment of the battery pack of the present embodiment is shown.

[0076] In some embodiments, the second glue-filling region 8 includes a third sub-region 81 and a fourth sub-region 82, a third support layer 6 is arranged between the middle plates 12 corresponding to the adjacent two cell stacks 2, the third support layer 6 is connected with the fourth support layer 7, the first support layer 3, the third support layer 6 and the fourth support layer 7 jointly define the third sub-region 81, and the second support layer 4, the third support layer 6 and the fourth support layer 7 jointly define the fourth sub-region 82.

[0077] Specifically, the third support layer 6 is arranged between the middle plates 12 of the adjacent two cell stacks 2, the arrangement of the third support layer 6 can connect the two middle plates 12 and fill the original gap between the two middle plates 12, thereby providing effective support for the two middle plates 12 and improving the overall rigidity of the battery pack.

[0078] The third support layer 6 is arranged between the middle plates 12 of the adjacent two cell stacks 2, and the third support layer 6 is connected with the two middle plates 12. Exemplarily, the third support layer 6 can be directly bonded with the middle plate 12 or be in interference fit with the middle plate 12, and the present embodiment does not limit the specific connection mode of the third support layer 6 and the middle plate 12, as long as the third support layer 6 can form an effective and firm connection between the two middle plates 12.

[0079] The third support layer 6 is connected with the fourth support layer 7, and the first support layer 3, the third support layer 6 and the fourth support layer 7 jointly define a third sub-region 81, and the second support layer 4, the third support layer 6 and the fourth support layer 7 jointly define a fourth sub-region 82. In this way, since the third support layer 6 can shield the hollow part on the middle plate 12, the glue poured into the third sub-region 81 and the fourth sub-region 82 is prevented from overflowing from the hollow part on the middle plate 12 into the battery cell stack 2, thereby ensuring the performance of the battery cell stack as a whole.

[0080] In some embodiments, the height of the glue layer 9 is greater than or equal to 1 / 5 of the height of the battery cell stack 2. In this way, the glue layer 9 can provide sufficient support between the side walls of two adjacent battery cell stacks 2, thereby effectively improving the rigidity of the battery pack. When the height of the glue layer 9 is less than 1 / 5 of the height of the battery cell stack 2, the rigidity of the battery pack cannot be effectively improved, which is not conducive to actual use.

[0081] In particular implementation, since the possibility of being impacted near the first end plate 11a or the second end plate 11b is greater, the first end plate 11a and the second end plate 11b near the first end plate 11a and the second end plate 11b need to be provided with greater rigidity, and the middle part of the battery cell stack 2 does not need to be provided with too great rigidity.

[0082] Based on this, Figure 14 A cross-sectional schematic view of a sixth embodiment of the battery pack of the present embodiment is shown.

[0083] In some embodiments, referring to Figure 14 It can be seen that the bottom of the first support layer 3 and the bottom of the second support layer 4 are connected with the bottom plate 101 of the box body 1. In this way, the first support layer 3 and the second support layer 4 can fill all the gaps between the two first end plates 11a and the two second end plates 11b, thereby providing effective support between the two first end plates 11a and the two second end plates 11b, so as to improve the rigidity at the positions of the first end plate 11a and the second end plate 11b.

[0084] Meanwhile, the middle part of the first support layer 3 and the middle part of the second support layer 4 can be connected with the fourth support layer 7. In this way, the first support layer 3, the second support layer 4 and the fourth support layer 7 can jointly define a smaller second glue pouring region 8, so as to increase the rigidity of the middle part of the battery pack in a small range, thereby meeting the actual demand for the rigidity of the battery pack.

[0085] In some embodiments, the top of the first support layer 3, the second support layer 4 and / or the third support layer 6 is flush with the top surface of the cell stack 2, so that the support of the first support layer 3, the second support layer 4 and / or the third support layer 6 to the cell stack 2 can be ensured to effectively improve the rigidity of the battery pack, and the actual preparation process is facilitated, and the top of the first support layer 3, the second support layer 4 and / or the third support layer 6 is not protruded from the cell stack 2, which is not conducive to subsequent assembly.

[0086] In some embodiments, the first support layer 3, the second support layer 4, the third support layer 6 and / or the fourth support layer 7 can be a foam layer, and the adhesive layer 9 can be a foaming adhesive layer, so that the foam layer and the bottom plate can form a foaming adhesive area to accommodate the foaming adhesive poured into the area and limit the flow of the foaming adhesive.

[0087] In addition, the foam layer has a certain deformability. When the foam layer is placed between two first end plates 11a, two second end plates 11b or two middle plates 12, the foam layer can be bonded to one of the first end plates 11a, the second end plates 11b or the middle plates 12, and the other first end plate 11a, the second end plate 11b or the middle plate 12 can directly extrude the foam layer to form an abutting action without further bonding, which can reduce the number of bonding and facilitate actual operation.

[0088] Figure 15 A partial enlarged schematic view of a seventh embodiment of the battery pack of the present embodiment is shown.

[0089] In some embodiments, the locking bracket 10 is further included, and the locking bracket 10 is connected to the top of the first end plate 11a and the second end plate 11b. The first end plates 11a of the adjacent two cell stacks 2 are connected through the locking bracket 10, and the second end plates 11b of the adjacent two cell stacks 2 are connected through the locking bracket 10.

[0090] Specifically, the first end plates 11a of the adjacent two cell stacks 2 and the second end plates 11b of the adjacent two cell stacks 2 are connected through the locking bracket 10, which can further improve the structural stability between the adjacent two cell stacks 2 and ensure the relative fixation between the adjacent two cell stacks 2.

[0091] In some embodiments, the first support layer 3, the second support layer 4, the third support layer 6 and the fourth support layer 7 can all be made of a foam material, which has good deformability, facilitating the connection between the adjacent cell stack 2 and each support layer. Exemplarily, the first support layer 3 is bonded with the first end plate 11a of one of the cell stacks 2, and then another cell stack 2 is directly pressed against the first support layer 3 during assembly to make the first support layer 3 interference fit with the first support layer 3, thereby realizing the connection between the first end plate 11a of the other cell stack 2 and the first support layer 3, without further bonding the first end plate 11a of the other cell stack 2 and the first support layer 3, facilitating the actual assembly.

[0092] It should be understood by those of ordinary skill in the art that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest the scope of the application (including the claims) is limited to these examples; the above embodiments or technical features among different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of the aspects of the application as described above, which are not provided in detail for the sake of brevity.

[0093] The embodiments of the present application are intended to cover all such alternatives, modifications, and variations of the present application falling within the broad scope of the appended claims. Accordingly, any and all such modifications, variations, or equivalents that fall within the spirit and scope of the present application are intended to be included within the scope of the application.

Claims

1. A battery pack, characterized by, The application relates to a battery pack, comprising: a box body and at least two electric cell stacks arranged in the box body, each electric cell stack comprising a plurality of electric cells stacked along a first direction, the at least two electric cell stacks being arranged adjacently along a second direction perpendicular to the first direction, each electric cell stack being provided with a first end plate and a second end plate at two ends thereof, a first support layer being arranged between two first end plates corresponding to two adjacent electric cell stacks, a second support layer being arranged between two second end plates corresponding to two adjacent electric cell stacks, and a glue layer being arranged between the first support layer and the second support layer.

2. The battery pack of claim 1, wherein, The glue layer extends along a length direction of the electric cell stack.

3. The battery pack of claim 2, wherein, The first support layer and the second support layer are connected with a bottom plate of the box body, and the first support layer, the second support layer and the bottom plate jointly define a first glue filling area, and the glue layer is arranged in the first glue filling area.

4. The battery pack of claim 3, wherein, The first glue filling area comprises a first sub-area and a second sub-area, each electric cell stack comprises two sub-stacks, each sub-stack comprises a plurality of electric cells, a middle plate is arranged between two sub-stacks, a third support layer is arranged between two middle plates corresponding to two adjacent electric cell stacks, the third support layer is connected with the bottom plate of the box body, the first support layer, the third support layer and the bottom plate jointly define the first sub-area, and the second support layer, the third support layer and the bottom plate jointly define the second sub-area.

5. The battery pack of claim 3, wherein, A fourth support layer is further arranged between two adjacent electric cell stacks, the fourth support layer extends along the length direction of the electric cell stack and is connected with the first support layer and the second support layer, the first support layer, the second support layer and the fourth support layer jointly define a second glue filling area, and the glue layer is arranged in the second glue filling area.

6. The battery pack of claim 5, wherein, The second glue filling area comprises a third sub-area and a fourth sub-area, each electric cell stack comprises at least two sub-stacks, each sub-stack comprises a plurality of electric cells, a middle plate is arranged between two sub-stacks, a third support layer is arranged between two middle plates corresponding to two adjacent electric cell stacks, the third support layer is connected with the fourth support layer, the first support layer, the third support layer and the fourth support layer jointly define the third sub-area, and the second support layer, the third support layer and the fourth support layer jointly define the fourth sub-area.

7. The battery pack of claim 5, wherein, The fourth support layer is arranged higher than the bottom plate, and a height of the glue layer is greater than or equal to 1 / 5 of a height of the electric cell stack.

8. The battery pack of claim 5, wherein, Bottoms of the first support layer and the second support layer are connected with the bottom plate of the box body.

9. The battery pack of any one of claims 4 or 6, wherein, Top portions of the first support layer, the second support layer and / or the third support layer are flush with a top surface of the electric cell stack.

10. The battery pack of claim 6, wherein, The first support layer, the second support layer, the third support layer and / or the fourth support layer are foam layers, and the glue layer is a foaming glue layer.

11. The battery pack of claim 1, wherein, The locking support is connected with the top of the first end plate and the second end plate, and the first end plates of two adjacent battery cell stacks are connected through the locking support, and the second end plates of two adjacent battery cell stacks are connected through the locking support.

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