Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a lower box body, an upper cover, at least one battery cell stacking body, at least one fixed bracket and a high-voltage busbar, the lower box body comprises a bottom wall and side walls; the battery core stacking body is arranged on the bottom wall; the at least one fixing support is arranged on the inner side of the side wall and comprises a supporting part and a fixing part which are connected, the fixing part is connected with the side wall, and a containing space is formed between the fixing support and the side wall; the high-voltage busbar is arranged in the accommodating space along the length direction of the high-voltage busbar and is electrically connected with the battery cell stacking body, the supporting part is positioned between the high-voltage busbar and the bottom wall to support the high-voltage busbar, and the fixing part prevents the high-voltage busbar from being separated from one side, deviating from the side wall, of the accommodating space; the fixing support further comprises a limiting part, the limiting part is of an elastic structure, the limiting part is connected to the end, away from the supporting part, of the fixing part so as to prevent the high-voltage busbar from disengaging from the side, away from the supporting part, of the containing space, and the technical problem that the high-voltage busbar is prone to disengaging from the support when encountering vibration or impact can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery pack. Background Art

[0002] With the rapid development of the automobile industry, traditional fuel vehicles are gradually being replaced by new energy vehicles. Among them, pure electric vehicles are a type of new energy vehicles. The battery pack, as the core power supply system in electric vehicles, is usually composed of single cells connected in series and parallel. The current of all single cells in series and parallel is output through the high-voltage busbar to provide energy for the car.

[0003] The high-voltage busbar is usually arranged on the side wall of the battery pack along its own length and is supported and fixed by a bracket. When the battery pack encounters vibration or impact, the high-voltage busbar can easily fall out of the bracket, thereby threatening the safety of the battery pack. Utility Model Content

[0004] The utility model provides a battery pack to improve the technical problem that a high-voltage busbar is easily dislodged from a bracket when encountering vibration or impact.

[0005] To achieve the above-mentioned objectives and other related objectives, the present invention provides a battery pack. The battery pack comprises: a lower case, an upper cover, at least one battery cell stack, at least one fixing bracket, and a high-voltage busbar; the lower case comprises a bottom wall and side walls; at least one battery cell stack is disposed on the bottom wall; at least one fixing bracket is disposed on the inner side of the side wall, the fixing bracket comprising a connected supporting portion and a fixing portion, the fixing portion being connected to the side wall, and an accommodating space being formed between the fixing bracket and the side wall; the high-voltage busbar is disposed in the accommodating space along its length and is electrically connected to the battery cell stack; the supporting portion is located between the high-voltage busbar and the bottom wall to support the high-voltage busbar, and the fixing portion prevents the high-voltage busbar from escaping from the side of the accommodating space away from the side wall; the fixing bracket further comprises a limiting portion, which is an elastic structure and is connected to one end of the fixing portion away from the supporting portion to prevent the high-voltage busbar from escaping from the side of the accommodating space away from the supporting portion.

[0006] In an example of the battery pack of the present invention, the limiting portion includes a first protrusion protruding toward the side wall and a handle, and the handle is connected to a side of the first protrusion away from the fixing portion.

[0007] In an example of the battery pack of the present invention, the minimum distance from the first protrusion to the side wall is L1, the thickness of the high-voltage busbar is T, and T / 3≤L1≤T.

[0008] In one example of the battery pack of the present invention, the limiting portion includes at least one serrated portion, the serrated portion close to the high-voltage busbar is connected to the fixing portion, the serrated portion includes a limiting surface facing the high-voltage busbar and a guide surface connected to the limiting surface, and the guide surface faces the direction in which the high-voltage busbar is installed.

[0009] In an example of the battery pack of the present invention, the minimum distance from the serrations to the side wall is L2, the thickness of the high-voltage busbar is T, and T / 3≤L2≤T.

[0010] In an example of a battery pack of the present invention, the limiting portion includes a stop portion, a second protrusion and a third protrusion. The stop portion is connected to the fixing portion and extends in a direction away from the supporting portion. The second protrusion is connected to the fixing portion and protrudes toward the side wall. The third protrusion is connected to the second protrusion and protrudes toward the side wall, and the third protrusion has a groove formed on the side facing the stop portion.

[0011] In an example of the battery pack of the present invention, the minimum distance from the second protrusion to the side wall is L3, the minimum distance from the third protrusion to the side wall is L4, and L3≤L4.

[0012] In an example of the battery pack of the present invention, T / 3≤L3≤T.

[0013] In an example of the battery pack of the present invention, the battery pack further includes a wiring harness, which is arranged between the third protrusion and the stop portion along its length direction.

[0014] In an example of the battery pack of the present invention, a groove is connected to the side of the third protrusion away from the second protrusion, and a fourth protrusion is formed on the side of the groove facing the stop portion. The minimum distance from the fourth protrusion to the stop portion is L5, and the diameter of the wiring harness is φ, φ / 3≤L5≤φ.

[0015] In the battery pack of the present invention, at least one fixing bracket is provided on the inner side of the side wall, the fixing bracket includes a connected supporting portion and a fixing portion, the fixing portion is connected to the side wall, and an accommodating space is formed between the fixing bracket and the side wall, the high-voltage busbar is provided in the accommodating space along its length direction, the supporting portion is located between the high-voltage busbar and the bottom wall to support the high-voltage busbar, the fixing portion can prevent the high-voltage busbar from escaping from the side of the accommodating space away from the side wall, a limiting portion is provided at one end of the fixing portion away from the supporting portion, the limiting portion is an elastic structure, so that the limiting portion can be away from the side wall when the high-voltage busbar is installed, so as to facilitate the high-voltage busbar to enter the accommodating space, and the limiting portion can also be reset after the high-voltage busbar is installed to prevent the high-voltage busbar from escaping from the side of the accommodating space away from the supporting portion. The fixing bracket firmly confines the high-voltage busbar in the accommodating space, and can improve the technical problem that the high-voltage busbar is easily escaping from the bracket when encountering vibration or impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of an example of a battery pack of the present invention;

[0018] Figure 2 for Figure 1 A in the middle is a partial enlarged view of an example of the battery pack of the present invention;

[0019] Figure 3 This is a schematic structural diagram of a fixing bracket of an example of a battery pack of the present invention;

[0020] Figure 4 for Figure 1 A is a cross-sectional view of an example of a battery pack of the present invention;

[0021] Figure 5 for Figure 1 A in the middle is a partial enlarged view of another example of the battery pack of the present invention;

[0022] Figure 6 This is a schematic structural diagram of another example of a fixing bracket for a battery pack of the present invention;

[0023] Figure 7 for Figure 1 A is a cross-sectional view of another example of the battery pack of the present invention;

[0024] Figure 8 for Figure 1 A in the middle is a partial enlarged view of another example of the battery pack of the present invention;

[0025] Figure 9 This is a structural schematic diagram of another example of a fixing bracket for a battery pack of the present invention;

[0026] Figure 10 for Figure 1 A in the middle is a cross-sectional view of another example of the battery pack of the present invention.

[0027] Component number description

[0028] 10. Battery pack; 100. Box body; 110. Bottom wall; 120. Side wall; 200. Fixed bracket; 210. Support portion; 220. Fixed portion; 230. Limiting portion; 231. First protrusion; 232. Serrated portion; 2321. Limiting surface; 2322. Guide surface; 233. Stopping portion; 234. Second protrusion; 235. Third protrusion; 236. Handle; 237. Connecting portion; 238. Groove; 239. Fourth protrusion; 300. High-voltage busbar; 400. Wiring harness. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following examples and the features in the examples can be combined with each other unless there is a conflict. It should also be understood that the terms used in the examples of the present invention are for the purpose of describing specific implementation methods, not for the purpose of limiting the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0030] When numerical ranges are given in the examples, it should be understood that, unless otherwise specified herein, both endpoints of each numerical range and any value between the endpoints may be used. Unless otherwise defined, all technical and scientific terms used in this utility model are consistent with the prior art as understood by those skilled in the art and the description of this utility model. Any prior art methods, equipment, and materials similar or equivalent to those described in the examples of this utility model may also be used to implement this utility model.

[0031] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0032] A battery pack is a component that stores electrical energy and includes at least one cell stack. It's understood that a cell stack consists of multiple cells connected in series or parallel to form a fully encapsulated, independent unit. A battery pack is composed of at least one of these independent units and is an energy assembly that can be directly coupled to an electrical device. The current from the cell stack converges at the high-voltage output terminal, which is connected to a high-voltage busbar. This busbar then directs the electrical energy into the battery pack's electrical box, where it then powers the external electrical devices connected to the battery pack.

[0033] The high-voltage busbar is usually arranged on the side wall of the battery pack along its own length and is supported and fixed by a bracket. However, the inventor found that when the battery pack encounters vibration or impact, the high-voltage busbar is easy to fall out of the bracket, thereby threatening the safety of the battery pack.

[0034] In view of this, the present invention provides a technical solution, in which at least one fixing bracket is provided on the inner side of the side wall of the battery pack. The fixing bracket includes a connected support portion, a fixing portion, and a limiting portion, and forms a storage space for the high-voltage busbar between the fixing bracket and the side wall. The support portion is used to support the high-voltage busbar, the fixing portion is used to limit the high-voltage busbar from being released from the side, and the limiting portion is used to limit the high-voltage busbar from being released from the side away from the support portion. This fixing bracket firmly confines the high-voltage busbar within the storage space, which can alleviate the technical problem that the high-voltage busbar is easily released from the bracket when encountering vibration or impact.

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] See also Figures 1 to 10 To achieve the above-mentioned and other related purposes, the present invention provides a battery pack 10. The battery pack 10 includes: a lower case 100, an upper cover, at least one battery cell stack, at least one fixing bracket 200, and a high-voltage busbar 300. The upper cover and the battery cell stack are not shown in the figure. It is understandable that the components listed in the present invention do not cover all components of the battery pack 10, but only the parts improved by the present invention. In fact, the battery pack 10 should also include the necessary electrical system and the connection structure for connecting to the vehicle body, etc., which will not be repeated here.

[0037] See also Figure 1, the lower box body 100 includes a bottom wall 110 and a side wall 120. The bottom wall 110 and the side wall 120 can be integrally formed or can be separately processed and then assembled, and there is no limitation on this. The shape of the bottom wall 110 is not limited, for example, it can be rectangular, circular, polygonal, elliptical or other irregular shapes, and can be adaptively designed according to the installation space and power requirements of the battery pack 10 in the electrical device. Usually, the side wall 120 is set to form a accommodating cavity around the bottom wall 110, and there is no limitation on the shape of the side wall 120. In this embodiment, the bottom wall 110 is rectangular, and the four side walls 120 are rectangular and are arranged around the bottom wall 110. The material of the bottom wall 110 and the side wall 120 is not limited, for example, it can be steel, aluminum alloy, carbon fiber composite material or thermoplastic plastic, etc. It should be noted that when the material of the lower box body 100 is conductive, the surface of the lower box body 100 needs to be insulated. Furthermore, mounting structures such as mounting holes, convex surfaces, and concave surfaces are provided on the bottom wall 110 and the side wall 120 for positioning, connecting, and fixing with other components.

[0038] Furthermore, at least one battery cell stack is disposed on the bottom wall 110, meaning that the battery pack 10 includes one or more battery cell stacks. The battery cell stack can be attached to the bottom wall 110, for example, by bonding or by a bracket. It is understood that a battery cell stack includes multiple battery cells, which are connected in series and parallel to form an independent unit with a complete package appearance. The type and shape of the battery cells are not limited, and they can be, for example, prismatic batteries, cylindrical batteries, or pouch batteries, and will not be further described here.

[0039] Further, see Figure 1 , at least one fixing bracket 200 is arranged on the inner side of the side wall 120, that is, one or more fixing brackets 200 are arranged on the inner side of the side wall 120. The number of fixing brackets 200 depends on the length of the high-voltage busbar 300 that needs to be fixed, and is not limited here, as long as the high-voltage busbar 300 can be firmly fixed. The installation position of the fixing bracket 200 on the side wall 120 is not limited. In some embodiments, the high-voltage busbar 300 is linear, and multiple fixing brackets 200 are arranged side by side in a linear manner along the installation direction of the high-voltage busbar 300, such as Figure 1 In some other embodiments, the high-voltage busbar 300 is in the shape of a broken line or a curve, and the installation positions of the plurality of fixing brackets 200 are adaptively arranged according to the shape of the high-voltage busbar 300 to firmly fix the high-voltage busbar 300.

[0040] Specifically, see Figures 2 to 10The fixing bracket 200 includes a supporting portion 210 and a fixing portion 220 that are connected to each other. The supporting portion 210 and the fixing portion 220 can be integrally formed or assembled separately, and there is no limitation on this. The fixing portion 220 is connected to the side wall 120, and the connection method can be welding, bonding, or connection through fasteners or clips, and there is no limitation on this, as long as an accommodating space is formed between the fixing bracket 200 and the side wall 120.

[0041] See also Figure 1 The high-voltage busbar 300 is disposed within the accommodation space along its length. The high-voltage busbar 300 is electrically connected to the battery cell stack and is used to transmit high-voltage current. The length, shape, and installation position of the high-voltage busbar 300 are not limited and can be adaptively selected according to actual design requirements. The material of the high-voltage busbar 300 can be copper, aluminum, copper alloy, aluminum alloy, stainless steel, or a composite material. In this embodiment, the high-voltage busbar 300 is a copper busbar.

[0042] Further, see Figure 1 、 Figure 2 、 Figure 5 and Figure 8 The support portion 210 is located between the high-voltage busbar 300 and the bottom wall 110. In this embodiment, the support portion 210 is located below the high-voltage busbar 300 to support the high-voltage busbar 300. The fixing portion 220 is arranged opposite the side wall 120 to prevent the high-voltage busbar 300 from escaping from the side of the accommodation space away from the side wall 120.

[0043] Considering that the high voltage busbar 300 is easy to escape from the side of the accommodation space opposite to the support portion 210, in this embodiment, please refer to Figures 2 to 10The fixing bracket 200 also includes a limiting portion 230, which is connected to the end of the fixing portion 220 away from the supporting portion 210. It can be understood that the limiting portion 230 is located above the accommodating space and needs to be able to provide sufficient accommodating space for the high-voltage busbar 300. The limiting portion 230 is an elastic structure. The elastic structure can be made of a material that is inherently elastic, such as rubber, polyurethane, silicone, polytetrafluoroethylene or thermoplastic elastomer; it can also be made of a material that is inherently inelastic or has low elasticity, and needs to be made into a structure with a certain thickness that can be easily bent and restored to its original shape, such as metal, plastic, graphene or nanomaterials, so that when the high-voltage busbar 300 is installed, the limiting portion 230 can bend in a direction away from the side wall 120, so that the high-voltage busbar 300 can enter the accommodating space, and the limiting portion 230 can also be reset after the high-voltage busbar 300 is installed. It should be noted that the fixing bracket 200 preferably has insulating properties. If it is made of a conductive material, its surface needs to be insulated. Furthermore, by preventing the high-voltage busbar 300 from escaping from the side of the accommodation space away from the support portion 210, the fixing bracket 200 firmly confines the high-voltage busbar 300 within the accommodation space, thereby alleviating the technical problem of the high-voltage busbar 300 easily escaping from the bracket when encountering vibration or impact.

[0044] The following describes the technical solution of the fixing bracket 200 of the present disclosure in detail with reference to several specific embodiments:

[0045] See also Figures 2 to 4 In an example of the battery pack 10 of the present invention, the limiting portion 230 includes a first protrusion 231 protruding toward the side wall 120. The first protrusion 231 can be arc-shaped, broken line-shaped, or other irregular shapes, and there is no limitation to this, as long as the first protrusion 231 can limit the high-voltage busbar 300 from escaping from the top of the accommodating space. The first protrusion 231 in this embodiment is arc-shaped. The arc of the first protrusion 231 facing outward facilitates the entry of the high-voltage busbar 300 during installation. The side of the first protrusion 231 facing the accommodating space is also arc-shaped to facilitate the removal of the high-voltage busbar 300. Preferably, the limiting portion 230 also includes a handle 236, which is connected to the side of the first protrusion 231 away from the fixing portion 220. The provision of the handle 236 facilitates the breaking of the limiting portion 230 away from the side wall 120 to allow the high-voltage busbar 300 to pass through. Furthermore, in this embodiment, the support portion 210 and the side wall 120 are connected by a connecting portion 237, and the connecting portion 237 extends from one end of the support portion 210 close to the side wall 120 toward the bottom wall 110. The connection method between the connecting portion 237 and the side wall 120 is not limited, and can be welding, bonding, fastener connection, or clamping through a clamp, etc.

[0046] Preferably, see Figure 4In one example of the battery pack 10 of the present invention, the minimum distance between the first protrusion 231 and the sidewall 120 is L1, the thickness of the high-voltage busbar 300 is T, and T / 3 ≤ L1 ≤ T. The setting of L1 ≤ T allows the first protrusion 231 to restrict the high-voltage busbar 300, preventing it from being dislodged. The setting of L1 ≥ T / 3 facilitates achieving the required distance for inserting or removing the high-voltage busbar 300 when bending the limiting portion 230 away from the sidewall 120. This setting not only restricts the high-voltage busbar 300 but also facilitates its insertion and removal.

[0047] See also Figures 5 to 7 In another example of the battery pack 10 of the present invention, the limiting portion 230 includes at least one serration 232, that is, there may be one serration 232 or multiple serrations 232. In this embodiment, three serrations 232 are included, and the three serrations 232 are arranged side by side along the height direction of the fixing bracket 200. The serration 232 close to the high-voltage busbar 300 is connected to the fixing portion 220. The serration 232 includes a limiting surface 2321 facing the high-voltage busbar 300 and a guide surface 2322 connected to the limiting surface 2321. The limiting surface 2321 can be a plane or a curved surface. The limiting surface 2321 in this embodiment is a plane, and the limiting surface 2321 can better limit the high-voltage busbar 300 from falling out. The guide surface 2322 faces the direction of installation of the high-voltage busbar 300. Specifically, the angle between the guide surface 2322 and the limiting surface 2321 is an acute angle. The guide surface 2322 can guide the high-voltage busbar 300 to enter, so as to facilitate the installation of the high-voltage busbar 300.

[0048] Preferably, see Figure 7 In one example of the battery pack 10 of the present invention, the minimum distance between the serrations 232 and the sidewall 120 is L2, the thickness of the high-voltage busbar 300 is T, and T / 3 ≤ L2 ≤ T. The setting of L2 ≤ T allows the limiting surface 2321 to restrict the high-voltage busbar 300, preventing it from escaping. The setting of L2 ≥ T / 3 allows the limiting portion 230 to be bent away from the sidewall 120 to more easily reach the required distance for inserting or removing the high-voltage busbar 300. This setting not only allows the serrations 232 to restrict the high-voltage busbar 300, but also facilitates the insertion and removal of the high-voltage busbar 300.

[0049] See also Figures 8 to 10In another example of the battery pack 10 of the present invention, the limiting portion 230 includes a stop portion 233, a second protrusion 234 and a third protrusion 235; the stop portion 233, the second protrusion 234 and the third protrusion 235 can be integrally formed or assembled separately, and there is no limitation on this. The second protrusion 234 and the third protrusion 235 can be arc-shaped, broken line-shaped or other irregular shapes, and there is no limitation on this. The stop portion 233 is connected to the fixing portion 220 and extends in a direction away from the support portion 210. The stop portion 233 and the fixing portion 220 can be integrally formed or separately provided; the second protrusion 234 is connected to the fixing portion 220 and protrudes toward the side wall 120. The second protrusion 234 and the fixing portion 220 can be integrally formed or separately provided. The second protrusion 234 has a limiting effect on the high-voltage busbar 300. The third protrusion 235 is connected to the second protrusion 234 and protrudes toward the side wall 120 . The third protrusion 235 can increase the strength of the limiting portion 230 and further improve the limiting effect.

[0050] See also Figures 9 and 10 In this embodiment, the stopper 233, the second protrusion 234, the third protrusion 235, the fixing portion 220, and the support portion 210 are all integrally formed. In this technical solution, the stopper 233 of the limiting portion 230 can remain stationary, and only the second protrusion 234 and the third protrusion 235 are bent in a direction away from the side wall 120 to change the distance between the side wall 120 and the side wall 120, thereby facilitating the installation and removal of the high-voltage busbar 300. The second protrusion 234 and the third protrusion 235 in this technical solution have a small width, which facilitates bending. Furthermore, in this embodiment, the support portion 210 and the side wall 120 are connected by a connecting portion 237, which extends from the end of the support portion 210 close to the side wall 120 toward the bottom wall 110. The connection method between the connecting portion 237 and the side wall 120 is not limited, and can be welding, bonding, fastener connection, or clamping by a clamp.

[0051] Preferably, see Figure 10 In one example of the battery pack 10 of the present invention, the minimum distance between the second protrusion 234 and the sidewall 120 is L3, and the minimum distance between the third protrusion 235 and the sidewall 120 is L4, where L3 ≤ L4. This arrangement ensures that the distance between the second protrusion 234 and the sidewall 120 is no greater than the distance between the third protrusion 235 and the sidewall 120. This arrangement also allows the retaining portion 230 to have a larger size on the opening side, facilitating the insertion and guiding of the high-voltage busbar 300. The second protrusion 234 also effectively prevents the high-voltage busbar 300 from being removed.

[0052] Preferably, see Figure 10In one example of the battery pack 10 of the present invention, T / 3 ≤ L3 ≤ T. The setting of L3 ≤ T allows the second protrusion 234 to restrict the high-voltage busbar 300, preventing it from being dislodged. The setting of L3 ≥ T / 3 makes it easier to achieve the required distance for inserting or removing the high-voltage busbar 300 when bending the limiting portion 230 away from the sidewall 120. This setting not only ensures that the second protrusion 234 restricts the high-voltage busbar 300, but also facilitates the insertion and removal of the high-voltage busbar 300.

[0053] See also Figure 10 In one example of the battery pack 10 of the present invention, the battery pack 10 also includes a wiring harness 400, which is a component used for signal transmission in the electrical system of the battery pack 10. Considering the need for securing the wiring harness 400, in this embodiment, the wiring harness 400 is positioned along its length between the third protrusion 235 and the stopper 233. In this technical solution, the second and third protrusions 234, 235 can bend toward the sidewall 120, thereby varying the distance between them and the stopper 233, facilitating the insertion and removal of the wiring harness 400. Furthermore, the presence of the third protrusion 235 as a spacer between the wiring harness 400 and the high-voltage busbar 300 can further reduce the probability of contact between the wiring harness 400 and the high-voltage busbar 300, thereby improving safety. Furthermore, once the wiring harness 400 is installed, it can prevent the second protrusion 234 from bending away from the sidewall 120, further enhancing the effectiveness of the second protrusion 234 in preventing the high-voltage busbar 300 from being removed.

[0054] Preferably, see Figure 10 In one example of the battery pack 10 of the present invention, a groove 238 is connected to the side of the third protrusion 235 facing away from the second protrusion 234. A fourth protrusion 239 is formed on the side of the groove 238 facing the stopper 233. The arrangement of the groove 238 creates a larger opening between the fourth protrusion 239 and the stopper 233, facilitating the insertion of the wiring harness 400. Preferably, the minimum distance between the fourth protrusion 239 and the stopper 233 is L5, and the diameter of the wiring harness 400 is φ, where φ / 3 ≤ L5 ≤ φ. The setting of L5 ≤ φ allows the fourth protrusion 239 to restrict the wiring harness 400, preventing it from escaping. The setting of L5 ≥ φ allows the fourth protrusion 239 to be bent toward the sidewall 120 to more easily reach the required distance for insertion or removal of the wiring harness 400. This arrangement not only ensures that the fourth protrusion 239 restricts the wiring harness 400 but also facilitates its insertion and removal.

[0055] The battery pack of the present invention is provided with at least one fixing bracket on the inner side of the side wall, the fixing bracket including a connected supporting portion and a fixing portion, the fixing portion being connected to the side wall, a receiving space being formed between the fixing bracket and the side wall, the high-voltage busbar being arranged in the receiving space along its length direction, the supporting portion being located between the high-voltage busbar and the bottom wall to support the high-voltage busbar, and the fixing portion being able to prevent the high-voltage busbar from escaping from the side of the receiving space away from the side wall; a limiting portion is provided at one end of the fixing portion away from the supporting portion, the limiting portion being an elastic structure to enable the limiting portion to be away from the side wall when the high-voltage busbar is installed, so as to facilitate the high-voltage busbar to enter the receiving space, and the limiting portion can also be reset after the high-voltage busbar is installed to prevent the high-voltage busbar from escaping from the side of the receiving space away from the supporting portion. The fixing bracket firmly confines the high-voltage busbar in the receiving space, and can improve the technical problem that the high-voltage busbar is easily escaping from the bracket when encountering vibration or impact. Therefore, the present invention effectively overcomes some practical problems in the prior art and has high utilization value and use significance. The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by persons skilled in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: A lower box body and an upper cover, wherein the lower box body includes a bottom wall and side walls; At least one battery cell stack, disposed on the bottom wall; at least one fixing bracket, disposed on an inner side of the side wall, the fixing bracket comprising a supporting portion and a fixing portion connected to each other, the fixing portion being connected to the side wall, and an accommodating space being formed between the fixing bracket and the side wall; a high-voltage busbar disposed in the accommodation space along its length and electrically connected to the battery cell stack; the support portion is located between the high-voltage busbar and the bottom wall to support the high-voltage busbar; and the fixing portion prevents the high-voltage busbar from escaping from the side of the accommodation space away from the side wall; The fixing bracket further includes a limiting portion, which is an elastic structure and is connected to one end of the fixing portion away from the supporting portion to prevent the high-voltage busbar from falling out of the accommodating space away from the side of the supporting portion.

2. The battery pack according to claim 1, wherein: The limiting portion includes a first protrusion protruding toward the side wall and a handle, wherein the handle is connected to a side of the first protrusion away from the fixing portion.

3. The battery pack according to claim 2, wherein: The minimum distance from the first protrusion to the side wall is L1, and the thickness of the high-voltage busbar is T, wherein T / 3≤L1≤T.

4. The battery pack according to claim 1, wherein: The limiting portion includes at least one serrated portion, the serrated portion close to the high-voltage busbar is connected to the fixing portion, the serrated portion includes a limiting surface facing the high-voltage busbar and a guide surface connected to the limiting surface, and the guide surface faces the direction in which the high-voltage busbar is installed.

5. The battery pack according to claim 4, characterized in that: The minimum distance from the serrations to the side wall is L2, and the thickness of the high-voltage busbar is T, wherein T / 3≤L2≤T.

6. The battery pack according to claim 1, wherein: The limiting portion includes a stop portion, a second protrusion and a third protrusion. The stop portion is connected to the fixing portion and extends in a direction away from the supporting portion. The second protrusion is connected to the fixing portion and protrudes toward the side wall. The third protrusion is connected to the second protrusion and protrudes toward the side wall.

7. The battery pack according to claim 6, characterized in that: The minimum distance from the second protrusion to the side wall is L3, and the minimum distance from the third protrusion to the side wall is L4, wherein L3≤L4.

8. The battery pack according to claim 7, characterized in that: T / 3≤L3≤T.

9. The battery pack according to claim 6, wherein: The battery pack further includes a wiring harness, which is arranged between the third protrusion and the stopper along a length direction of the wiring harness.

10. The battery pack according to claim 9, characterized in that: The third protrusion is connected to a groove on a side away from the second protrusion, and the groove forms a fourth protrusion on a side facing the stopper. The minimum distance from the fourth protrusion to the stopper is L5, and the diameter of the wiring harness is φ, wherein φ / 3≤L5≤φ.

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