Battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack which comprises a battery pack box body and a battery module, the battery pack box body is at least provided with a first cross beam and a second cross beam; a battery module mounting bin is formed between the first cross beam and the second cross beam; the battery module comprises a battery cell stacking body as well as a first end plate and a second end plate which are clamped on two sides of the battery cell stacking body; wherein the first end plate and the first cross beam are in sliding connection through a dovetail groove structure, and the second end plate and the second cross beam are in sliding connection through a dovetail groove structure. According to the utility model, the end plate is designed into one part of the cross beam of the battery pack box body, the end plate and the cross beam are matched through the dovetail groove and the wedge, and the end plate can be adjusted and moved along the height direction of the battery pack, so that the battery stacking precision and efficiency are improved, and meanwhile, the battery module space can be released based on battery cell expansive force data in the later life period of the battery cells; and the safety and the reliability of the battery module are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially relate to battery pack. BACKGROUND

[0002] With the rapid development of new energy vehicles, the huge market demand increases the demand of automobile battery, therefore needs to improve or optimize the production process or method of existing automobile battery, improves automobile battery production efficiency and product quality as far as possible to meet the growing market demand, good into the box structure can provide suitable working environment for the battery, including suitable temperature, humidity and pressure conditions, which helps to optimize the performance of the battery, prolongs the cycle service life of the battery, reduces the use cost of the user, at present, the module into the box mode is basically divided into two kinds: the first kind is artificial visual alignment, the second kind is alignment by using positioning pin, the positioning pin is arranged at the bottom of the box body, and the module is aligned by the positioning pin and the through hole on the module structure to realize the alignment of the module.

[0003] But artificial visual alignment and alignment by using positioning pin are only suitable for module into the box with less fixed hole positions, and artificial alignment positioning pin is needed, and the efficiency is also low, if deviation occurs in the alignment process, the module battery cell or the bottom of the box body has the risk of being scratched by the positioning pin. UTILITY MODEL CONTENT

[0004] The main purpose of the present application is to provide a battery pack, which aims to solve the problems of low efficiency of artificial visual alignment and alignment by using positioning pin when the module is put into the box, and the risk of scratching the module battery cell or the bottom of the box body by the positioning pin if deviation occurs in the alignment process.

[0005] In order to achieve the above-mentioned purpose of the application, the utility model discloses a battery pack in the first aspect, which comprises a battery pack box body and a battery module.

[0006] The battery pack box body is provided with at least a first cross beam and a second cross beam; the first cross beam and the second cross beam form a battery module mounting chamber therebetween.

[0007] The battery module comprises a battery cell stack and a first end plate and a second end plate clamped on both sides of the battery cell stack.

[0008] Among them, the first end plate and the first cross beam are connected through dovetail groove structure sliding connection, and the second end plate and the second cross beam are connected through dovetail groove structure sliding connection.

[0009] Further, a third cross beam is arranged in the battery pack box body, and the third cross beam and the first cross beam or the second cross beam form a battery module mounting chamber therebetween.

[0010] Furthermore, the dovetail groove structure includes dovetail plates provided on the first crossbeam and the second crossbeam, and the first end plate and the second end plate are provided with grooves adapted to the dovetail plates.

[0011] Furthermore, adjacent sides of the first crossbeam and the second crossbeam are provided with inclined surfaces, which respectively cooperate with the dovetail grooves of the first end plate and the second end plate.

[0012] Furthermore, a surface of the first crossbeam facing the second crossbeam is configured as a first inclined surface, and a surface of the second crossbeam facing the first crossbeam is configured as a second inclined surface.

[0013] Furthermore, the first inclined surface and the second inclined surface form the battery module installation compartment into a space that is wide at the top and narrow at the bottom, so that the first end plate and the second end plate can be adjusted along the height direction of the battery pack.

[0014] Furthermore, threaded holes are provided on the sides of the first end plate and the second end plate that are away from each other, and the crossbeam and the end plates can be fixed by means of set screws.

[0015] Furthermore, a cold plate is fixedly connected to the bottom of the battery pack box, and the cold plate is provided with a first avoidance hole for inserting the first end plate and a second avoidance hole for inserting the second end plate.

[0016] Furthermore, a pressure plate is provided on the top of the battery pack case, and the pressure plate is connected to the first beam, the second beam and the third beam respectively by bolts; the battery module is arranged between the pressure plate and the battery pack case.

[0017] Furthermore, a glue layer is provided at the bottom of the pressing plate, and the pressing plate and the battery module are bonded and fixed via the glue layer.

[0018] Beneficial effects:

[0019] The battery pack of the present invention designs the end plate as a part of the crossbeam of the battery pack box. The end plate and the crossbeam are matched through dovetail grooves and wedges. The end plate can be adjusted along the height direction of the battery pack, thereby improving the battery stacking accuracy and efficiency. At the same time, in the later stage of the battery cell life, the battery module space can be released based on the battery cell expansion force data, thereby improving the safety and reliability of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG1 shows an isometric view of a battery module entering a box according to an embodiment of the present disclosure;

[0021] Figure 2 A partial cross-sectional view of a battery module box according to an embodiment of the present disclosure is shown;

[0022] Figure 3A front view of a battery module end plate according to an embodiment of the present disclosure is shown;

[0023] Figure 4 A front view of a dovetail groove structure of a battery module according to an embodiment of the present disclosure is shown;

[0024] Figure 5 A diagram showing a battery module being boxed according to an embodiment of the present disclosure is shown.

[0025] in:

[0026] 100 - battery pack box; 110 - third crossbeam; 120 - first crossbeam; 121 - dovetail plate; 130 - second crossbeam; 140 - cold plate; 141 - first avoidance hole; 142 - second avoidance hole; 200 - first end plate; 210 - set screw; 220 - groove; 230 - second end plate; 300 - battery module; 400 - pressure plate;

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions 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 device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] Reference Figure 1 、 Figure 4 and Figure 5 An embodiment of the present invention provides a battery pack, including a battery pack case 100 and a battery module 300; the battery pack case 100 is provided with at least a first crossbeam 120 and a second crossbeam 130; a battery module 300 installation compartment is formed between the first crossbeam 120 and the second crossbeam 130; the battery module 300 includes a battery cell stack and a first end plate 200 and a second end plate 230 clamped on both sides of the battery cell stack; wherein the first end plate 200 and the first crossbeam 120 are slidably connected by a dovetail groove structure; the second end plate 230 and the second crossbeam 130 are slidably connected by a dovetail groove structure;

[0033] Specifically, when in use, the first crossbeam 120 and the second crossbeam 130 are first screwed and fixed to the bottom plate of the battery pack box 100. The first crossbeam 120 and the second crossbeam 130 are relatively installed to form an installation compartment for placing the battery module 300. Before the battery module 300 is placed in the battery pack, it is tied together with the first end plate 200 and the second end plate 230 by a cable tie and placed together in the installation compartment. After placement, the cable tie is removed. The dovetail plate 121 provided on the first crossbeam 120 and the second crossbeam 130 cooperates with the groove 220 provided on the first end plate 200 and the second end plate 230. This groove 220 can be a T-slot, a V-slot, etc., and is used to form a linear guide sliding structure with the dovetail plate 121. There is no need for manual visual alignment or alignment using positioning pins, which increases the convenience of operation and improves work efficiency.

[0034] Reference Figure 1 A third crossbeam 110 is provided in the battery pack box 100, and a battery module 300 installation compartment is formed between the third crossbeam 110 and the first crossbeam 120 or the second crossbeam 130; the dovetail groove structure includes a dovetail plate 210 provided on the first crossbeam 120 and the second crossbeam 130, and a groove 220 adapted to the dovetail plate is opened on the first end plate 200 and the second end plate 230;

[0035] Specifically, a third crossbeam 110 can be added and arranged on the corresponding side of the first crossbeam 120 or the corresponding side of the second crossbeam 120, so that an installation compartment is formed between the third crossbeam 110 and the first crossbeam 120 or the third crossbeam 110 or the second crossbeam 130. At the same time, a corresponding dovetail plate 210 is also provided to cooperate with the groove 220 on the first end plate 200 and the second end plate 230. When the three crossbeams exist in the battery pack box 100 at the same time, multiple independent installation compartments are formed for placing the battery modules 300. Whether to add the third crossbeam 110 can be selected according to actual operational needs, thereby improving the utilization space of the battery pack and the flexibility and versatility of the equipment.

[0036] At the same time, a groove 220 can also be set on the first crossbeam 120 and the second crossbeam 130, and a dovetail plate 210 can be set on the first end plate 200 and the second end plate 230. The opposite side of the first crossbeam 120 and the second crossbeam 130 and the side away from the first end plate 200 and the second end plate 230 can be matched through a dovetail groove structure, so as to facilitate the placement of the battery module 300.

[0037] Reference Figure 2 The first crossbeam 120 has a first inclined surface on one side facing the second crossbeam 130, and the second crossbeam 130 has a second inclined surface on one side facing the first crossbeam 120. The first and second inclined surfaces form a space that is wide at the top and narrow at the bottom for the battery module 300 installation compartment, allowing the first end plate 200 and the second end plate 230 to be adjusted along the height direction of the battery pack. The bottom of the battery pack case 100 is fixedly connected to a cold plate 140, which is provided with a first avoidance hole 141 for inserting the first end plate 200 and a second avoidance hole 142 for inserting the second end plate 130.

[0038] Specifically, heat is generated during operation of the battery pack. The cold plate 140 can help the battery pack to effectively dissipate heat, reduce the temperature of the battery during operation, and improve the performance and service life of the battery. At the same time, an avoidance hole 141 is opened on the cold plate 140. In the initial state, the bottom of the first end plate 200 is completely inserted into the bottom of the first avoidance hole 141, and the bottom of the second end plate 230 is completely inserted into the bottom of the second avoidance hole 142. When the battery module 300 expands after being used for a period of time, the pressing plate 400 is opened, and the first end plate 200 and the second end plate 230 are pulled to slide upward. Because the first crossbeam 120 and the second crossbeam 130 are provided with opposing inclined surfaces, a space with a wider top and a narrower bottom is formed to accommodate the battery module 300. When the first end plate 200 and the second end plate 230 are moved upward, the distance between them increases, thereby allowing the battery module 300 arranged between the first end plate 200 and the second end plate 230 to have a larger expansion space.

[0039] Reference Figure 3 , the first end plate 200 and the second end plate 230 are both provided with threaded holes on their respective sides, and the crossbeam and the end plates can be fixed by means of set screws 210;

[0040] Specifically, the end plate and the crossbeam are connected by means of the set screws 210 , which not only improves the stability of the connection but also allows the end plate 200 to move when the set screws 210 are loosened.

[0041] Reference Figure 4 A pressure plate 400 is provided on the top of the battery pack case 100; the pressure plate 400 is connected to the first crossbeam 120, the second crossbeam 130 and the third crossbeam 110 respectively by bolts, and the battery module 300 is arranged between the pressure plate 400 and the battery pack case 100, and the top of the cold plate 140 is adhered to the bottom of the battery module 300 by gluing; a glue layer is provided at the bottom of the pressure plate 400, and the pressure plate 400 and the battery module 300 are bonded and fixed by the glue layer.

[0042] Specifically, before placing the battery module 300 into the battery pack case 100, the battery pack case 100 is thoroughly cleaned to ensure that there is no dust or impurities inside, and then glue is applied to the top of the cold plate 140. The battery module 300 is glued to the cold plate 140, and the crossbeam and the pressure plate 400 are connected by a threaded structure. Finally, glue is applied to the large bottom surface of the pressure plate 400 and bonded to the top of the battery module 300 to complete the fixation of the battery module 300 in the battery pack case 100, effectively preventing the battery module 300 from moving or being damaged during vehicle driving.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery pack, comprising a battery pack case and a battery module; characterized in that: The battery pack box is provided with at least a first crossbeam and a second crossbeam; a battery module installation compartment is formed between the first crossbeam and the second crossbeam; The battery module includes a cell stack and a first end plate and a second end plate clamped on both sides of the cell stack; The first end plate and the first crossbeam are slidably connected via a dovetail groove structure; the second end plate and the second crossbeam are slidably connected via a dovetail groove structure.

2. The battery pack according to claim 1, wherein: A third crossbeam is provided in the battery pack box, and a battery module installation compartment is formed between the third crossbeam and the first crossbeam or the second crossbeam.

3. The battery pack according to claim 1, wherein: The dovetail groove structure includes dovetail plates arranged on the first crossbeam and the second crossbeam, and the first end plate and the second end plate are provided with grooves adapted to the dovetail plates.

4. The battery pack according to claim 1, wherein: Adjacent sides of the first crossbeam and the second crossbeam are provided with inclined surfaces, which respectively cooperate with the dovetail grooves of the first end plate and the second end plate.

5. The battery pack according to claim 4, characterized in that: A surface of the first crossbeam facing the second crossbeam is configured as a first inclined surface, and a surface of the second crossbeam facing the first crossbeam is configured as a second inclined surface.

6. The battery pack according to claim 5, characterized in that: The first inclined surface and the second inclined surface form the battery module installation compartment into a space that is wide at the top and narrow at the bottom, so that the first end plate and the second end plate can be adjusted along the height direction of the battery pack.

7. The battery pack according to claim 1, wherein: The first end plate and the second end plate are both provided with threaded holes on their sides away from each other, and the crossbeam and the end plates can be fixed by means of set screws.

8. The battery pack according to claim 1, wherein: A cold plate is fixedly connected to the bottom of the battery pack box, and the cold plate is provided with a first avoidance hole for inserting the first end plate and a second avoidance hole for inserting the second end plate.

9. The battery pack according to claim 7, characterized in that: A pressure plate is provided on the top of the battery pack case, and the pressure plate is connected to the first beam, the second beam and the third beam respectively by bolts. The battery module is arranged between the pressure plate and the battery pack case, and the top of the cold plate is adhered to the bottom of the battery module by gluing.

10. The battery pack according to claim 9, characterized in that: A glue layer is provided on the bottom of the pressing plate, and the pressing plate and the battery module are bonded and fixed via the glue layer.

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