Power battery protection shell

Abstract

The utility model discloses a power battery protection shell which comprises a shell sleeved outside a battery pack, the shell is of an integral square shell structure, the bottom of the shell is provided with a plurality of transversely and vertically arranged reinforcing ribs which are used for supporting the bottom of the battery pack and enabling the battery pack and the bottom of the shell to have a first interlayer, and the side wall of the shell is provided with an elastic piece. One side of the elastic piece abuts against the inner side wall of the shell, and the other side abuts against the side wall of the battery pack, so that a second interlayer is formed between the side wall of the battery pack and the inner side wall of the shell. When the battery pack is strongly impacted, the battery pack is broken, impact energy is absorbed as much as possible, and damage of impact to the internal battery pack is reduced. Due to the existence of the reinforcing edges and the elastic pieces, an interlayer structure is arranged between the battery pack and the shell and is used for preventing hard objects from directly transmitting force to the battery pack during impact; after the battery is impacted, the elastic piece is compressed firstly, and the elastic piece has a good buffering effect on the battery pack.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy batteries, and in particular relates to a power battery protective shell. Background Art

[0002] New energy batteries are mainly lithium iron phosphate batteries, which are lithium-ion batteries that use lithium iron phosphate (LiFePO4) as the positive electrode material and carbon as the negative electrode material. They are wrapped in an aluminum shell and made into a block structure with a length, width and thickness of about 15*12*3cm. As a power battery component, multiple block batteries are required to work in coordination to meet the power and voltage requirements.

[0003] The takeaway industry requires the uninterrupted use of electric vehicles. In order to avoid waiting for charging time, detachable and replaceable new energy batteries are very suitable. The battery is composed of multiple block batteries arranged and fixed, and the battery pack as a whole is powered together. The battery blocks corresponding to the battery pack are fixed by the outer shell, and then the whole is sleeved in a protective shell. The upper side of the protective shell is the open side, and the single side is inserted into the open side and sealed by the sealing cover. Although the battery block is wrapped with a metal shell, when the battery car travels on a bumpy road or is hit, the battery will also collide, and the battery pack circuit is easy to fall off. At the same time, the impact is easy to cause the battery block to deform, and it is very difficult to remove the battery and reuse it later. Therefore, the utility model provides a plastic shell protective shell, which increases the protective space between the battery pack and the outer shell, absorbs the impact energy by self-fragmentation, and protects the internal battery pack to the greatest extent. Utility Model Content

[0004] The purpose of the utility model is to provide a power battery protective shell, provide a plastic shell type protective shell, increase the protective space between the battery pack and the outer shell, absorb impact energy by self-fragmentation, etc., and protect the internal battery pack to the greatest extent.

[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0006] A power battery protective shell, comprising an outer shell sleeved on the outside of a battery pack, wherein the battery pack comprises a plurality of battery blocks, and the battery blocks are arranged and spliced ​​with a fixed shell on the outside;

[0007] The shell is an overall square shell structure with an open top for socketing the battery pack. The bottom of the shell has a plurality of reinforcing edges arranged horizontally and vertically for supporting the bottom of the battery pack so that the battery pack and the bottom of the shell have a first interlayer. The side walls of the shell are equipped with spring plates, one side of which abuts against the inner side wall of the shell and the other side abuts against the side wall of the battery pack, so that a second interlayer is formed between the side wall of the battery pack and the inner side wall of the shell.

[0008] Furthermore, the corresponding side wall of the shell protrudes outward to form a boss, and the corresponding corner positions between the boss structures on the outer wall of the shell are step grooves. The boss structure forms a second interlayer inside the shell, and the spring sheet is located in the second interlayer.

[0009] Furthermore, the spring sheet includes a slat, both ends of which are bent toward the same side to form a supporting portion, the slat is parallel to the supporting portion, and there is an arc bend between the slat and the supporting portion, the slat is abutted against the inner wall of the outer shell, and the supporting portion is abutted against and supported by the side wall of the battery pack.

[0010] The support portion is bent inwardly to form a limiting portion corresponding to the slat, and the support portion and the limiting portion are curved in an arc shape.

[0011] The centers of the slats corresponding to the spring pieces are all fixed to the same support frame. The support frame is a frame-shaped structure formed by integrated transverse, longitudinal and vertical metal strips, which fix all the slats into a whole.

[0012] The support frame has a square positioning groove corresponding to the bottom of the shell, and the reinforcing edge of the bottom of the shell forms a square positioning frame. The positioning groove is sleeved with the positioning frame to fix the integral spring piece.

[0013] Furthermore, the housing has a mounting portion at a corner position corresponding to the opening side, and bolt holes are arranged at four corner positions corresponding to the mounting portion.

[0014] The utility model has the following beneficial effects: the shell is mostly made of resin casting, which does not have the deformation property of metal. When subjected to a strong impact, it breaks itself and absorbs the impact energy as much as possible to reduce the damage to the internal battery pack caused by the impact. Due to the presence of the reinforcing edges and the spring pieces, a sandwich structure is provided between the battery pack and the shell. The bottom reinforcing edges can also serve to increase the strength of the bottom of the shell. The sandwich structure is used to prevent hard objects from directly transmitting force to the battery pack during an impact. At the same time, the spring pieces provide elastic support. The battery first compresses the spring pieces after being impacted, and the spring pieces have a good buffering effect on the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0016] Figure 1 : Schematic diagram of the structure of the utility model.

[0017] Figure 2 : Schematic diagram of the bottom structure of the shell of the utility model.

[0018] Figure 3 : Schematic diagram of the installation position structure of the utility model.

[0019] In the accompanying drawings, the components represented by the various reference numerals are listed as follows: housing 1, battery pack 2, reinforcing rib 11, spring sheet 3, slat 31, supporting portion 32, limiting portion 33, supporting frame 4, positioning frame 12, mounting portion 13, bolt hole 14. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] like Figure 1-3 As shown: a power battery protective shell, including an outer shell 1 that is sleeved on the outside of a battery pack 2, the battery pack 2 includes multiple battery blocks, and the battery blocks are arranged and spliced ​​with a fixed shell on the outside; the fixed shell is a shell structure with a single open side, which is used to arrange and install battery blocks. The function of the fixed shell is to shrink the multiple battery blocks into a whole, which is easy to manage and prevent the battery from shaking.

[0022] The outer shell 1 is an overall square shell structure with an open top for receiving the battery pack 2. The bottom of the outer shell 1 has a plurality of reinforcing edges 11 arranged horizontally and vertically for supporting the bottom of the battery pack 2 so that the battery pack 2 and the bottom of the outer shell 1 have a first interlayer. The side wall of the outer shell 1 is provided with a spring sheet 3, one side of the spring sheet 3 abuts against the inner side wall of the outer shell, and the other side abuts against the side wall of the battery pack 2, so that a second interlayer is formed between the side wall of the battery pack 2 and the inner side wall of the outer shell 1.

[0023] The shell is mostly made of resin casting, which does not have the deformation properties of metal. When it is hit strongly, it will break itself and absorb the impact energy as much as possible to reduce the damage to the internal battery pack. Due to the presence of reinforcing edges and shrapnel, there is a sandwich structure between the battery pack and the shell. The bottom reinforcing edges can also increase the strength of the bottom of the shell. The sandwich structure is used to prevent hard objects from directly transmitting force to the battery pack during impact. At the same time, the shrapnel provides elastic support. The battery first compresses the shrapnel after being impacted, and the shrapnel has a good buffering effect on the battery pack.

[0024] The first interlayer and the second interlayer also effectively promote airflow and improve heat dissipation effect.

[0025] The corresponding side wall of the shell 1 protrudes outward to form a boss, and the corresponding corner positions between the boss structures on the outer wall of the shell are step grooves. The boss structure forms a second interlayer inside the shell 1, and the spring 3 is located in the second interlayer. The boss structure is an outward extension of the side wall of the shell, which does not affect the overall regular structure of the shell. The formed step groove is convenient for limiting and fixing with the battery box of the electric vehicle, and the overall battery is smoother and more beautiful.

[0026] like Figure 1As shown: the spring piece 3 includes a slat 31, both ends of the slat 31 are bent to the same side to form a support portion 32, the slat 31 is parallel to the support portion 32, and there is an arc bend between the slat 31 and the support portion 32, the slat 31 is close to the inner wall of the housing 1, and the support portion 32 is close to the side wall of the battery pack 2. The support portion is formed by bending the plate body in an arc shape, and the support portion is a flat plate structure, which increases the contact surface with the battery pack. When the support portion is compressed, the compression causes the arc portion to deform, which plays an elastic buffering role.

[0027] The support part 32 is bent inwardly, and a limit part 33 is formed between the corresponding slat 31. The support part 32 and the limit part 33 are curved. The limit part is formed after the end of the support part is curved, and is used to contact with the slat to facilitate the assembly of the battery pack. At the same time, when the support part and the slat are compressed to the limit, the corresponding arcs on both sides are compressed at the same time, providing elastic protection, improving toughness and protection strength. The single-side side wall of the shell is two springs, which are parallel to each other and vertically arranged.

[0028] The center of the slats 31 corresponding to the spring pieces 3 are all fixed to the same support frame 4. The support frame 4 is a frame-shaped structure, formed by integrated horizontal, longitudinal and vertical metal strips, fixing all the slats 31 as a whole. The slats and the support frame are made of the same tough metal material, an integrated structure, and the side wall of the shell corresponding to the support frame is a door-shaped, and the spring pieces and the shell are made of different materials, so the spring pieces are detachable and the overall structure is convenient for unified installation and disassembly.

[0029] like Figure 2 As shown: the support frame 4 has a square positioning groove corresponding to the bottom of the shell 1, and the reinforcing edge 11 at the bottom of the shell 1 forms a square positioning frame 12. The positioning groove and the positioning frame 12 are positioned and sleeved to fix the integral spring. The positioning groove is formed by arranging the horizontal and vertical metal sheets, and is positioned and matched with the positioning frame structure to accurately install the support frame, and the metal frame is not easy to fall off.

[0030] The height of the positioning frame is slightly higher than the reinforcing edge, and the raised portion is the same as the thickness of the metal frame, which is used to maintain the consistent levelness of the supporting battery pack.

[0031] like Figure 1 As shown: the housing 1 has a mounting portion 13 at the corner position corresponding to the opening side, and bolt holes 14 are provided at the four corner positions corresponding to the mounting portion 13. The bolt holes are used to correspond to the bolt holes at the corners of the sealing cover, and are assembled by bolts. During installation, the butt joint side is also sealed with a rubber strip to prevent dust and rain.

[0032] This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention.

Claims

1. A power battery protective shell, characterized in that: It comprises a housing (1) sleeved on the outside of a battery pack (2), wherein the battery pack (2) comprises a plurality of battery blocks, and the battery blocks are arranged and spliced ​​to have a fixed housing on the outside; The outer shell (1) is an overall square shell structure, with an open top for sleeve-connecting the battery pack (2). The bottom of the outer shell (1) has a plurality of reinforcing edges (11) arranged horizontally and vertically for supporting the bottom of the battery pack (2), so that the battery pack (2) and the bottom of the outer shell (1) form a first interlayer. The side wall of the outer shell (1) is provided with a spring sheet (3), one side of the spring sheet (3) abuts against the inner side wall of the outer shell, and the other side abuts against the side wall of the battery pack (2), so that a second interlayer is formed between the side wall of the battery pack (2) and the inner side wall of the outer shell (1).

2. A power battery protective shell according to claim 1, characterized in that: The corresponding side wall of the shell (1) protrudes outward to form a boss, and the corresponding corner positions between the boss structures on the outer wall of the shell are step grooves. The boss structure forms a second interlayer inside the corresponding shell (1), and the spring sheet (3) is located in the second interlayer.

3. A power battery protective shell according to claim 1, characterized in that: The spring sheet (3) comprises a slat (31), both ends of the slat (31) are bent towards the same side to form a supporting portion (32), the slat (31) is parallel to the supporting portion (32), an arc is formed between the slat (31) and the supporting portion (32), the slat (31) is in contact with the inner side wall of the outer shell (1), and the supporting portion (32) is in contact with and supported by the side wall of the battery pack (2).

4. A power battery protective shell according to claim 3, characterized in that: The support portion (32) is bent inwardly to form a limiting portion (33) corresponding to the slat (31), and an arc is formed between the support portion (32) and the limiting portion (33).

5. A power battery protective shell according to claim 3, characterized in that: The centres of the slats (31) corresponding to the spring pieces (3) are all fixed to the same support frame (4). The support frame (4) is a frame-shaped structure formed by integrated transverse, longitudinal and vertical metal strips, fixing all the slats (31) as a whole.

6. A power battery protective case according to claim 5, characterized in that: The support frame (4) has a square positioning groove corresponding to the bottom of the shell (1), and the reinforcing edge (11) at the bottom of the shell (1) forms a square positioning frame (12). The positioning groove and the positioning frame (12) are positioned and sleeved to fix the integral spring piece.

7. A power battery protective case according to claim 1, characterized in that: The housing (1) has a mounting portion (13) at a corner position corresponding to the opening side, and bolt holes (14) are arranged at four corner positions corresponding to the mounting portion (13).

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