Battery pack

Abstract

The utility model provides a battery pack which comprises a bottom plate and side beams which form an accommodating space; the battery core stacking body is positioned in the accommodating space; the battery core end plates are arranged between the side surfaces of the battery core stacking body and the side beams corresponding to the side surfaces; an avoiding space is formed between at least one part of the battery cell end plate and the side beam; the bracket is positioned in the avoiding space and comprises an end surface which is in contact with at least one part of the battery cell end plate; and the high-voltage busbar is arranged in the bracket. The bracket is arranged in the avoiding space which is arranged between the battery cell end plate and the side beam and is used for mounting the high-voltage busbar, and the bracket comprises the end surface which is in contact with at least one part of the battery cell end plate, namely, the end surface is in direct contact with the target area, which is easy to deform and break, of the battery cell end plate to form support; therefore, the target area of the battery cell end plate is not easy to deform and fracture, and the risk that the target area presses the high-voltage busbar and causes failure or short circuit of the high-voltage busbar is also reduced.

Description

TECHNICAL FIELD

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

[0002] In order to reduce the mass of the battery pack and save the internal space, the cell end plate used for maintaining the cell stack is generally made of plastic and directly cooperates with the battery pack frame, but due to the need to avoid the high-voltage busbar, the cell end plate locally leaves a avoiding space with the battery pack frame. Under the swelling condition of the cell, the cell end plate will extrude the avoiding space, thereby the risk of local fracture of the cell end plate occurs, and the swollen or fractured cell end plate may in turn extrude the high-voltage busbar, so that the high-voltage busbar has the risk of failure or short circuit. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to provide a battery pack to solve the above-mentioned partial or all technical problems.

[0004] In order to achieve the above-mentioned purpose, the present application provides a battery pack, comprising:

[0005] a bottom plate and a side beam, which form a containing space;

[0006] a cell stack located in the containing space, the cell stack comprising a plurality of cells stacked horizontally on the bottom plate;

[0007] a cell end plate arranged between the side of the cell stack and the side beam corresponding to the side; at least a part of the cell end plate is provided with an avoiding space with the side beam;

[0008] a bracket located in the avoiding space, the bracket comprising an end face in contact with at least a part of the cell end plate, and

[0009] a high-voltage busbar arranged in the bracket.

[0010] Further, the orthographic projection of the high-voltage busbar on the end face is located in the end face.

[0011] Further, the bracket comprises an integrated bracket continuously extending in the length direction of the side beam.

[0012] Further, the bracket comprises a plurality of discrete brackets arranged in the length direction of the side beam.

[0013] Further, the end face is provided with a limiting hole, and the high-voltage busbar is fixed in the bracket by a cable tie passing through the limiting hole.

[0014] Further, the limiting hole has a diameter of 6-8 mm, and the edge of the limiting hole is more than 5 mm away from the edge of the end face.

[0015] Further, the bracket is an L-shaped bracket, and an opening is formed between the L-shaped bracket and the side beam, and the opening is arranged towards the side close to the bottom plate or the side away from the bottom plate.

[0016] Further, the L-shaped bracket includes a long side in the height direction of the side beam, a wide side in the length direction of the side beam, and a short side perpendicular to the long side and the wide side, and the free end of the short side is connected to the end face, and the opening is formed between the long side and the side beam.

[0017] Further, the thickness of the bracket is 2-3 mm, the long side is greater than or equal to 30 mm, the short side is greater than or equal to 6 mm, and the wide side is greater than or equal to 30 mm.

[0018] Further, the bracket is integrally formed with the side beam or is welded and fixed with the side beam.

[0019] As can be seen from the above, the battery pack provided by the application sets a bracket in the avoiding space for installing the high-voltage busbar between the cell end plate and the side beam, and the bracket includes an end face in contact with at least a part of the cell end plate, that is, the end face directly contacts the target area of the cell end plate prone to deformation and fracture, and supports the target area, so that the target area can simultaneously receive the reverse abutting force from the end face of the bracket when subjected to the expansion pressure of the cell, thereby preventing the target area of the cell end plate from deforming and fracturing, reducing the risk of the target area pressing the high-voltage busbar and causing the high-voltage busbar to fail or short circuit, and enhancing the rigidity and strength of the cell end plate. In addition, the high-voltage busbar is arranged in the bracket, that is, the bracket also protects the high-voltage busbar located therein, further avoiding the risk of the cell end plate directly pressing the high-voltage busbar due to deformation. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a schematic diagram of the arrangement structure of the battery pack in the related art;

[0022] Figure 2 is a schematic diagram of the battery pack in the related art in Figure 1 sectional view at A.

[0023] Figure 3 For the battery pack in the related art Figure 1 The cross-sectional view at point A in the figure is shown, where the dotted area is the structural diagram of the cell end plate;

[0024] Figure 4 The battery pack of the embodiment of the present application is Figure 1 Schematic diagram of the cross section at point A;

[0025] Figure 5 This is a cross-sectional schematic diagram of a bracket according to an embodiment of the present application, which is positioned upright relative to a side beam;

[0026] Figure 6 This is a cross-sectional schematic diagram of an embodiment of the present application in which the bracket is inverted relative to the side beam;

[0027] Figure 7 This is a schematic diagram of a three-dimensional structure in which the discontinuous bracket according to an embodiment of the present application is inverted relative to the side beam;

[0028] Figure 8 This is a schematic diagram of the three-dimensional structure of the continuous bracket according to the embodiment of the present application, which is upright relative to the side beam;

[0029] Figure 9 This is a schematic diagram of a three-dimensional structure in which the continuous bracket according to an embodiment of the present application is inverted relative to the side beam;

[0030] Figure 10 This is a schematic structural diagram of the L-shaped bracket in an embodiment of the present application.

[0031] Description of reference numerals:

[0032] 1. Bottom plate; 2. Side beam; 3. Battery cell stack; 4. Battery cell end plate; 5. Avoidance space; 6. Bracket; 61. Limiting hole; 62. Opening; 63. End face; 64. Long side; 65. Short side; 66. Wide side; 7. High-voltage busbar. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] As described in the background technology section, with the continuous development of new energy vehicles, power batteries are gradually developing towards high energy density and high volume utilization. When designing the interior of the battery pack, the space occupancy rate of the battery cells gradually increases, and the space left for other structural parts is getting less and less. It is a major challenge to reasonably arrange the key structural parts while meeting the structural strength. In order to reduce the weight of the battery pack and save its internal space, the battery cell end plate 4 is generally set as a plastic part, and will directly cooperate with the frame of the battery pack (including multiple side beams 2). However, due to the need to avoid the high-voltage busbar 7, there will be a avoidance space between the battery cell end plate 4 and the battery pack frame. Under expansion conditions, the battery cell end plate 4 will squeeze the avoidance space, thereby causing the risk of local fracture of the battery cell end plate 4, and the expanded or broken battery cell end plate 4 may then squeeze the high-voltage busbar 7, making the high-voltage busbar 7 at risk of failure or short circuit.

[0036] like Figures 1-3 As shown, Figure 1 A schematic diagram of the three-dimensional structure of a battery pack is shown. Figure 2 、 Figure 3 A partial cross-sectional diagram of a battery pack is shown. The battery pack may include a base plate 1 and four side beams 2 connected to the edges of the base plate 1. The base plate 1 and the four side beams 2 together define a space for accommodating a cell stack 3, wherein the cell stack 3 may include multiple cells stacked horizontally on the base plate 1. In addition, a cell end plate 4 is provided between the side of the cell stack 3 and the side beams 2 corresponding to the side; an escape space 5 for installing a high-voltage busbar 7 is provided between the upper portion of the cell end plate 4 and the side beams 2. Figure 3The dashed box in the figure is an electric core end plate 4 provided with an avoiding space 5, and the space between the dashed box and the side beam 2 is the avoiding space 5. When the electric core expands, the upper end of the plastic electric core end plate 4 is not attached to the side beam 2 of the battery pack, which causes the upper end of the electric core end plate 4 to deform greatly, and there is a risk of local structure breaking. Moreover, at the end of the expansion, as the deformation of the electric core end plate 4 gradually increases, when the electric core end plate 4 is pressed onto the high-voltage busbar 7, it will cause the high-voltage busbar 7 to fail or risk short circuit. Therefore, under the premise of not affecting the setting position of the high-voltage busbar 7, how to further improve the structural strength and rigidity of the electric core end plate 4 is a problem to be solved.

[0037] Based on this, the application provides a battery pack, by setting a support 6 in the avoiding space 5, the structural strength and rigidity of the electric core end plate 4 can be further improved without affecting the setting position of the high-voltage busbar 7.

[0038] Hereinafter, the technical solutions of the application will be described in detail through specific embodiments and in combination with Figures 1-10

[0039] In some embodiments, referring to Figure 1 、 Figure 4 , a battery pack comprises:

[0040] a bottom plate 1 and a side beam 2, the bottom plate 1 and the side beam 2 form a containing space; an electric core stack 3 located in the containing space, the electric core stack 3 comprising a plurality of electric cores stacked horizontally on the bottom plate 1; an electric core end plate 4 provided between the side of the electric core stack 3 and the side beam 2 corresponding to the side; at least a part of the electric core end plate 4 and the side beam 2 are provided with an avoiding space 5; a support 6 located in the avoiding space 5, the support 6 comprising an end face 63 in contact with at least a part of the electric core end plate 4, and a high-voltage busbar 7 provided in the support 6.

[0041] Exemplarily, the high-voltage busbar 7 can be made of copper, stainless steel, etc. The support 6 can be an aluminum metal support 6, the surface of which is pasted or coated with an insulating material (such as Teflon) to be electrically insulated from the high-voltage busbar 7. The support 6 can be an L-shaped support or a frame-shaped support.

[0042] At least a part of the electric core end plate 4 and the side beam 2 are provided with an avoiding space 5, which is mainly provided for the high-voltage busbar 7. The "at least a part" can be described as the part of the electric core end plate 4 opposite to the high-voltage busbar 7, for example, the projection part of the high-voltage busbar 7 on the electric core end plate 4, or the side wall of the electric core end plate 4 in the avoiding space 5. Exemplarily, the part can be the upper part of the electric core end plate 4. The at least a part of the electric core end plate 4 is not in direct contact with the side beam 2, and is prone to breaking or pressing the high-voltage busbar 7 in the case of electric core expansion, which is the target area of the electric core end plate 4 that needs to be strengthened in rigidity and strength. ​

[0043] Thus, the embodiment sets the bracket 6 in the avoiding space 5, the bracket 6 includes the end face 63 in contact with at least part of the electric core end plate 4, that is, the end face 63 directly contacts the target area which needs to be strengthened in rigidity and strength. When the electric core expands, the electric core end plate 4 will be subjected to the expansion pressure of the electric core, and the target area will also be subjected to the abutting force from the end face 63 due to the contact with the end face 63 of the bracket 6, which can be counteracted with the expansion pressure of the electric core, so that the target area is no longer easy to be deformed and broken. That is, the bracket 6 enhances the rigidity and strength of the target area of the electric core end plate 4, and at the same time enhances the rigidity and strength of the entire electric core end plate 4.

[0044] It should be noted that, in order to set the bracket 6 in the avoiding space 5, and the installation of the bracket 6 cannot interfere with the installation of the high-voltage busbar 7, or the installation of the high-voltage busbar 7 cannot interfere with the installation of the bracket 6, therefore, the avoiding space 5 in the bracket 6 can be widened, that is, the thickness of the target area of the electric core end plate 4 is reduced to provide necessary installation space for the bracket 6 and the high-voltage busbar 7. Figure 1

[0045] The battery pack provided by the embodiment sets the bracket 6 in the avoiding space 5 for installing the high-voltage busbar 7 between the electric core end plate 4 and the side beam 2, and the bracket 6 includes the end face 63 in contact with at least part of the electric core end plate 4, that is, the end face 63 directly contacts the target area of the electric core end plate 4 which is easy to be deformed and broken, and forms a supporting action on the target area, so that the target area can be subjected to the reverse abutting force from the end face 63 of the bracket 6 when subjected to the expansion pressure of the electric core, thereby making the target area of the electric core end plate 4 not easy to be deformed and broken, and reducing the risk of the target area pressing the high-voltage busbar 7 and causing the high-voltage busbar 7 to fail or short circuit, and enhancing the rigidity and strength of the electric core end plate 4. In addition, the high-voltage busbar 7 is arranged in the bracket 6, that is, the bracket 6 can also protect the high-voltage busbar 7 located therein, further avoiding the risk of the electric core end plate 4 being directly pressed due to deformation.

[0046] In some embodiments, as shown in Figure 4 , Figure 5 , Figure 6 the end-on projection of the high-voltage busbar 7 on the end face 63 is located in the end face 63. Taking the bracket 6 as an L-shaped bracket for example, after the high-voltage busbar 7 is installed relative to the bracket 6, the bottom edge of the high-voltage busbar 7 is in contact with the bottom edge of the L-shaped bracket, in order to make the end-on projection of the high-voltage busbar 7 on the end face 63 be located in the end face 63, only the top edge of the high-voltage busbar 7 is lower than the top edge of the L-shaped bracket can be achieved, that is, the high-voltage busbar 7 in the height direction is completely located in the bracket 6, or in other words, the high-voltage busbar 7 does not protrude in the height direction relative to the bracket 6, thereby making the bracket 6 can form more effective protection for the high-voltage busbar 7.

[0047] ​In some embodiments, as shown in Figure 4 、 Figure 7 the end face 63 is provided with a limiting hole 61, and the high-voltage busbar 7 is fixed in the bracket 6 by a cable tie passing through the limiting hole 61, wherein the diameter of the limiting hole 61 is 6-8 mm, and the edge of the limiting hole 61 is more than 5 mm away from the edge of the end face 63. That is, the diameter of the limiting hole 61 should be large enough to allow the cable tie or other limiting member to pass through. In addition, the edge of the limiting hole 61 needs to be more than 5 mm away from the edge of the end face 63, that is, the limiting hole 61 should not be too close to the edge of the end face 63 to avoid affecting the rigidity and strength of the end face 63.

[0048] In this embodiment, the limiting hole 61 is provided on the end face 63 of the bracket 6 to improve the constraint rigidity of the bracket 6 on the high-voltage busbar 7 and reduce the risk of fracture of the high-voltage busbar 7 under the vibration and impact conditions of the battery pack.

[0049] In some embodiments, as shown in Figure 8 、 Figure 9 the bracket 6 includes a continuous one-piece bracket extending in the length direction of the side beam 2. The continuous one-piece bracket 6 is suitable for the case where the target area is weak in rigidity and the surface of the target area is regular and flat. In other words, the continuous one-piece bracket 6 is suitable for the case where the avoidance space 5 is long and narrow, and the side wall (i.e., the target area) of the cell end plate 4 located in the avoidance space 5 is regular and flat. The end face 63 of the continuous one-piece bracket 6 is also a continuous long strip, that is, the long strip-shaped end face 63 can support the entire long strip-shaped target area of the cell end plate 4, so that the entire target area is not prone to deformation and fracture, thereby improving the rigidity and strength of the cell end plate 4.

[0050] In some embodiments, as shown in Figure 7 the bracket 6 includes a plurality of discrete brackets arranged at intervals in the length direction of the side beam 2. The bracket 6 in this embodiment is different from the continuous one-piece bracket 6 in the foregoing embodiments. The bracket 6 in this embodiment is arranged at intervals in the length direction of the side beam 2. The plurality of discrete brackets 6 can adapt to the special-shaped cell end plate 4, that is, the target area of the cell end plate 4 has a special-shaped structure, for example, a concave-convex structure or the like. The arrangement of the plurality of brackets 6 can cooperate with the local concave structure of the cell end plate 4 to provide a certain rigidity to the cell end plate 4 in the cell expansion direction, reduce the deformation of the cell end plate 4 caused by cell expansion, and protect the high-voltage busbar 7 to prevent the cell end plate 4 from pressing the high-voltage busbar 7 to cause short circuit. The design of the discrete bracket 6 has high arrangement flexibility, is convenient to install, and has light weight and low cost.

[0051] In some embodiments, as shown in Figure 5 、 Figure 6 、 Figure 10As shown, the bracket 6 is an L-shaped bracket, and an opening 62 is formed between the L-shaped bracket and the side beam 2, which is arranged towards the side close to the bottom plate 1 or away from the bottom plate 1. That is, the L-shaped bracket can be upright or inverted relative to the side beam 2.

[0052] Specifically, the L-shaped bracket includes a long side 64 in the height direction of the side beam 2, a wide side 66 in the length direction of the side beam 2, and a short side 65 perpendicular to the long side 64 and the wide side 66, and the free end of the short side 65 is connected to the end face 63, and the opening 62 is formed between the long side 64 and the side beam 2. When the L-shaped bracket is upright relative to the side beam 2, the free end of the short side 65 is connected to the side beam 2, and the bottom surface of the short side 65 is in contact with the bottom surface of the avoidance space 5, the outer side of the long side 64 is the end face 63 in contact with the target area of the cell end plate 4 (i.e. the side wall of the avoidance space 5), and the opening 62 formed between the long side 64 and the side beam 2 is arranged upward; when the L-shaped bracket is inverted relative to the side beam 2, the free end of the short side 65 is connected to the side beam 2, and the short side 65 is opposite to the upper part of the side wall of the avoidance space 5, the outer side of the long side 64 is the end face 63 in contact with the target area of the cell end plate 4 (i.e. the side wall of the avoidance space 5), and the opening 62 formed between the long side 64 and the side beam 2 is arranged downward.

[0053] It should be noted that, as shown in the avoidance space 5, Figure 1 the upper part of the cell end plate 4, and penetrates the upper end face 63 of the cell end plate 4, so when the cell expands, the deformation of the target area of the cell end plate 4 is more serious as it goes up. When the inverted L-shaped bracket contacts the target area of the cell end plate 4, the inflection points of the long side 64 and the short side 65 are in contact with or even abut against the upper part of the target area. Because the strength of the L-shaped bracket at the inflection points is higher than that at other positions, the inverted L-shaped bracket can provide strong support to the upper part of the target area, effectively reducing the deformation degree of the upper part of the target area, and is suitable for the case where the target area of the cell end plate 4 has relatively weak rigidity (e.g. the target area is relatively thin). Similarly, the inflection points of the long side 64 and the short side 65 of the upright L-shaped bracket are in contact with or even abut against the lower part of the target area, which is suitable for the case where the target area of the cell end plate 4 has relatively high rigidity (e.g. the target area is relatively thick).

[0054] In addition, the connection mode of the L-shaped bracket and the side beam 2 will also affect its adaptation, for example, when the rigidity of the target area of the cell end plate 4 is weak, the L-shaped bracket needs to provide strong support to the target area, so the connection mode of the L-shaped bracket and the side beam 2 can be integrally formed; when the rigidity of the target area of the cell end plate 4 is high, the connection mode of the L-shaped bracket and the side beam 2 can also meet the application requirements.

[0055] In addition, the size of the L-shaped support 6 directly affects the strength of the L-shaped support 6, and in order to ensure the structural strength, whether it is an integral support or a plurality of supports, especially a plurality of supports, the length, the short side, the wide side and the thickness should meet the corresponding size requirements, such as Figure 10 As shown, the length a of the long side 64 should be greater than or equal to 30 mm, the length b of the short side 65 should be greater than or equal to 6 mm, the length c of the wide side 66 should be greater than or equal to 30 mm, and the thickness d should be at least 2-3 mm.

[0056] It should be understood by those skilled in the art that the above discussion of any embodiment is only exemplary and is not intended to imply that the scope of the present application (including claims) is limited to these examples; the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above. In order to be brief, they are not provided in detail.

[0057] The embodiments of the present application are intended to cover all such alternatives, modifications and variations falling within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack, characterized by, The application relates to a battery pack, comprising: a bottom plate and a side beam, which form a containing space; an electric cell stack located in the containing space, the electric cell stack comprising a plurality of electric cells horizontally stacked on the bottom plate; an electric cell end plate arranged between a side of the electric cell stack and a side beam corresponding to the side, at least a part of the electric cell end plate being provided with a clearance space from the side beam; a support located in the clearance space, the support comprising an end face in contact with at least a part of the electric cell end plate, and a high-voltage busbar arranged in the support.

2. The battery pack of claim 1, wherein, The high-voltage busbar is located in the end face in a normal projection.

3. The battery pack of claim 1, wherein, The support comprises an integrated support continuously extending in the length direction of the side beam.

4. The battery pack of claim 1, wherein, The support comprises a plurality of discrete supports arranged in the length direction of the side beam.

5. The battery pack of claim 1, wherein, The end face is provided with a limiting hole, and the high-voltage busbar is fixed in the support through a cable tie passing through the limiting hole.

6. The battery pack of claim 5, wherein, The diameter of the limiting hole is 6-8 mm, and the edge of the limiting hole is greater than 5 mm away from the edge of the end face.

7. The battery pack of claim 1, wherein, The support is an L-shaped support, and an opening is formed between the L-shaped support and the side beam, the opening being arranged towards the side close to the bottom plate or the side away from the bottom plate.

8. The battery pack of claim 7, wherein, The L-shaped support comprises a long side in the height direction of the side beam, a wide side in the length direction of the side beam, and a short side perpendicular to the long side and the wide side, the free end of the short side being connected to the end face, and the long side and the side beam forming an opening.

9. The battery pack of claim 8, wherein, The thickness of the support is 2-3 mm, the long side is greater than or equal to 30 mm, the short side is greater than or equal to 6 mm, and the wide side is greater than or equal to 30 mm.

10. The battery pack of claim 1, wherein, The support is integrally formed with the side beam or is welded and fixed with the side beam.

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