Battery module fixing support and lithium battery box

Abstract

The utility model discloses a battery module fixing bracket and a lithium battery box. The battery module fixing bracket is used for fixing a battery module when the battery box is assembled, and the battery module fixing bracket is of an axial symmetry structure; at least two battery module fixing supports are used for clamping the battery module from the two sides of the battery module, and the battery module is fixedly installed in the battery box shell; the battery module fixing bracket comprises a first structure part serving as a main body and a second structure part serving as an extension structure; the first structure part comprises a first end face and a second end face which are oppositely arranged, a combined groove is formed in the first end face of the first structure part, and when the battery module is fixed, the combined groove abuts against the side face of the battery module to form insertion fit; the second structure part is arranged on the second end surface of the first structure part, the length of the second structure part can be cut, and when the battery module is fixed, the length of the battery module fixing bracket can be adjusted, so that the battery module fixing bracket is propped against the inner side wall of the battery box shell to form a supporting force.

Description

Technical Field

[0001] The utility model relates to the field of lithium battery manufacturing, in particular to a battery module fixing bracket and a lithium battery box. Background Art

[0002] With the advancement of battery technology, lead-acid batteries are gradually being replaced by lithium batteries in many applications. In order to ensure that the replacement is completed without affecting the original product assembly structure, the conventional practice is to replace the battery product by replacing the lithium battery in the shell of the original lead-acid battery.

[0003] Due to the high energy density of lithium batteries, the size of lithium batteries with the same capacity is significantly smaller than that of the original lead-acid batteries. Therefore, in the current lithium battery assembly process, because there is more remaining space, glue filling is often used to fix it, such as Figure 1 Although this method is simple to operate, it is costly and usually requires several kilograms of glue to be injected. Furthermore, if the battery needs to be reworked, the glue needs to be removed before the battery module can be taken out. After taking it out, there will be residual glue on the surface, which is difficult to clean. Utility Model Content

[0004] The utility model aims to provide a battery module fixing bracket to solve the above technical problems. The technical solution is as follows:

[0005] A battery module fixing bracket is used to fix the battery module when assembling a battery box, and the battery module fixing bracket is an axisymmetric structure; at least two of the battery module fixing brackets are used to clamp the battery module from both sides of the battery module, and the battery module is fixedly installed in the battery box housing;

[0006] The battery module fixing bracket includes a first structural part as a main body and a second structural part as an extension structure; the first structural part includes a first end face and a second end face arranged opposite to each other, and the first end face of the first structural part is provided with a combined groove, which is used to contact with the side of the battery module to form a plug-in fit when fixing the battery module; the second structural part is arranged on the second end face of the first structural part, and the length can be cut, which is used to adjust the length of the battery module fixing bracket when fixing the battery module, so that the battery module fixing bracket and the inner side wall of the battery box shell contact and form a supporting force.

[0007] Furthermore, the width of the first structural part is equivalent to the width of the cavity of the battery box shell, and the height of the first structural part is equivalent to the height of the battery module.

[0008] Further, the combined groove includes a rectangular groove and a special-shaped groove;

[0009] The length of the rectangular groove is equal to the height of the battery cell support of the battery module, the width of the rectangular groove is equal to the width of the battery cell support of the battery module, the rectangular groove abuts against the battery cell support of the battery module, and the horizontal movement of the battery module is restricted from three sides of the battery cell support;

[0010] The special-shaped groove protrudes relative to the rectangular groove, and a connecting surface is formed between the special-shaped groove and the rectangular groove; the special-shaped groove and the exposed part of the battery cell of the battery module are opposite to each other, and are used to make way for the battery cell of the battery module, so that the first structural part and the exposed part of the battery cell of the battery module are not in direct contact, and the vertical movement of the battery module is restricted from the top or bottom of the battery cell holder.

[0011] Furthermore, the special-shaped groove includes a plurality of continuous arc-shaped notches.

[0012] Furthermore, the other four side surfaces of the first structure portion are planes.

[0013] Furthermore, the second structural part includes four support columns with stepped structures disposed at four corners.

[0014] Furthermore, the number of steps of the support column is three or four.

[0015] Furthermore, countersunk holes corresponding to the support columns are provided at four corners of the first end surface of the first structural portion, and when the fixing brackets are stacked, all or part of the support columns are hidden in the countersunk holes.

[0016] Furthermore, the battery module fixing bracket is made of ABS material.

[0017] A lithium battery box comprises a battery box shell, a battery module and at least two battery module fixing brackets as described above; the battery module fixing brackets clamp the battery module from both sides of the battery module to fix the battery module to the bottom of the battery box shell.

[0018] The utility model achieves the following technical effects:

[0019] By adopting the battery module fixing bracket of the utility model, the battery module can be conveniently fixed in the battery box shell when the battery box is assembled, eliminating the glue filling process, reducing the production cost and weight of the battery box, and facilitating the rework and maintenance of the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of a lithium battery box based on the transformation of an existing lead-acid battery box;

[0021] Figure 2 It is a structural schematic diagram of a lithium battery box based on the transformation of a lead-acid battery box of the utility model;

[0022] Figure 3 It is an exploded view of the lithium battery box based on the lead-acid battery box transformation of the utility model;

[0023] Figure 4 It is a schematic diagram of the structural relationship between the fixing bracket and the battery module of the utility model;

[0024] Figure 5 It is a vertical view of the fixing bracket of the utility model;

[0025] Figure 6 It is another elevation view of the fixing bracket of the utility model;

[0026] Figure 7 It is a schematic diagram of stacking of the fixing bracket of the utility model. DETAILED DESCRIPTION

[0027] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0028] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0029] like Figures 2 to 7 As shown, an embodiment of a battery module fixing bracket is given. The battery module fixing bracket (hereinafter referred to as the fixing bracket 10) is made of ABS material, which is the same as the main material of the battery box shell on the market. Because the shell dimensions of the battery boxes currently used are almost all the same as the shell dimensions of the original lead-acid battery box, the characteristics of the shell dimensions of the lead-acid battery box are that the internal width dimensions are almost the same, but the length direction is different. Therefore, the width between the front and rear sides of the fixing bracket can be made into a fixed size, and the length direction can be designed by a stepped support column. According to the actual length of the shell, several sections of the support column can be broken / cut off to change the overall length of the fixing bracket. Its specific structure is described as follows.

[0030] The fixing bracket 10 is an axisymmetric structure, including an integrally-injected first structure portion 110 and a second structure portion 120. Specifically, the first structure portion 110 is the main body of the fixing bracket 10, including a first end face 111 and a second end face 112 arranged opposite to each other, and four side faces. The second structure portion 120 is an extension structure of the main body, and is arranged on the second end face 112 of the first structure portion.

[0031] The width of the first structure portion 110 is equivalent to the inner width of the battery box housing 30 , and the height of the first structure portion 110 is equivalent to the height of the battery module 20 .

[0032] The fixing bracket 10 is an axisymmetric structure. The fixing bracket 10 is used in pairs, and the battery module 20 is clamped from the left and right sides of the battery module 20 to fix the battery module 20 in the battery box. Among them, the fixing bracket 10 is integrally injection molded by an injection molding process, including a first structural part 110 as the main body of the fixing bracket 10 and a second structural part 120 as an extension structure. The first structural part 110 includes a first end face 111 and a second end face 112 that are relatively arranged. Among them, a combined groove is provided on the first end face 111, and the first end face 111 of the first structural part 110 contacts the battery module 20 to form a plug-in fit to limit the movement of the battery module 20 in all directions. The second structural part 120 is provided on the second end face of the first structural part 110, and includes a plurality of support columns. The length of the support column can be cut, and it contacts the inner wall of the battery box shell 30 during assembly.

[0033] Specifically, the first structural part 110 includes a first end face 111, a second end face 112, and four side faces. The width of the first structural part 110 is equivalent to the internal width of the battery box housing 30, and the height of the first structural part 110 is equivalent to the height of the battery module 20. The second structural part 120 is disposed on the second end face 112 of the first structural part.

[0034] In this embodiment, the battery module 20 includes a plurality of sub-battery modules assembled by a battery holder 210 , and these sub-battery modules are connected in series / parallel through electrodes to form a whole.

[0035] The combined groove includes a rectangular groove 130 and a special-shaped groove 140; the length of the rectangular groove 130 is equivalent to the height of the battery cell holder 210 of the battery module 20, the width of the rectangular groove 130 is equivalent to the width of the battery cell holder 210 of the battery module 20, the rectangular groove 130 and the battery cell holder 210 are abutted, and the horizontal movement of the battery module 20 is restricted from the three sides of the battery cell holder 210; the special-shaped groove 140 protrudes relative to the rectangular groove 130, and a connecting surface 141 is formed between the special-shaped groove 140 and the rectangular groove 130; the special-shaped groove 140 is opposite to the exposed part 220 of the battery cell of the battery module 20, making way for the battery cell of the battery module 20, so that the first structural part 110 and the exposed part 220 of the battery cell are not in direct contact, and the vertical movement of the battery module 20 is restricted from the top or bottom of the battery cell holder 210. In this way, the battery module 20 is stably fixed between the two fixing brackets 10 to prevent the battery module 20 from moving inside the battery box housing 30 when the battery box is vibrated by external force.

[0036] Preferably, the other four side surfaces of the first structural part 110 are planes, which facilitates injection molding production and gluing and fixing during assembly.

[0037] Preferably, the height of the fixing bracket 10 is consistent with the height of the battery module 20. This arrangement can ensure that after assembly, the bottom surface of the battery module 20 is in contact with the inner bottom of the battery box housing 30, thereby preventing the battery module 20 from being suspended in the air.

[0038] Preferably, the width of the fixing bracket 10 is equal to or slightly smaller than the inner cavity width of the battery box shell 30, so that after the battery module 20 is fixed, it will not shake back and forth under the action of external force due to the front and rear gaps between the fixing bracket 10 and the battery box shell 30.

[0039] Preferably, the fixing bracket 10 is made of ABS material, which is consistent with the main material of the battery box shell 30 on the market.

[0040] In order to flexibly adjust the length of the fixed bracket 10, preferably, the support column is designed as a stepped support column, including multiple stepped surfaces 121. The support column can be manually or with diagonal pliers to break off one or more steps to form different lengths. At the same time, through the stepped design, the lengths of the four support columns of the fixed bracket 10 after cutting can be guaranteed to be consistent, providing stable support.

[0041] Preferably, the fixing bracket 10 is a stackable structure. A countersunk hole 160 is provided at each of the four corners of the inner side surface of the battery module fixing bracket for making way for the support column (the second structural part 150). In this way, material consumption can be reduced and storage space can be saved.

[0042] Meanwhile, in the specific implementation process, if the total length after using a pair of fixing brackets 10 is not enough, multiple fixing brackets can be combined together to lengthen the length of the fixing brackets.

[0043] like Figure 2 As shown, the utility model also provides a lithium battery box, which is composed of a battery box housing 30, a top plate (not shown), a battery module 20 and at least two fixing brackets 10 as described above. The fixing brackets 10 clamp the battery module 20 from both sides of the battery module 20 and fix the battery module 20 to the bottom of the battery box housing 30. The assembly process of the battery box is as follows:

[0044] The length of the support column (the second structural part 120) is pre-adjusted so that after assembly, the fixing bracket 10 and the inner walls of the battery module 20 and the battery box housing 30 maintain a state of interference (or an overly tight fit state).

[0045] During assembly, the two fixing brackets 10 are respectively assembled at the two ends of the battery module 20, and the battery module 20 is positioned by the combined grooves on the inner side and the snap-fitting of the side of the battery module 20; then the assembly is loaded into the battery box shell 30 and placed against the bottom of the battery box shell 30.

[0046] After assembling the battery module, use this fixing bracket to fix the battery module in the middle, and then stick a small amount of epoxy resin glue on the bottom of the fixing bracket to fix the entire assembly into the battery box shell, so there is no need to fill glue and fix it. In addition, if rework is required, just break the fixing bracket apart to remove the entire battery module from the battery box shell.

[0047] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A battery module fixing bracket, used for fixing the battery module during battery box assembly, characterized in that: The battery module fixing bracket is an axisymmetric structure; at least two battery module fixing brackets are used to clamp the battery module from both sides of the battery module to fix the battery module in the battery box housing; The battery module fixing bracket includes a first structural part as a main body and a second structural part as an extension structure; the first structural part includes a first end face and a second end face arranged opposite to each other, and the first end face of the first structural part is provided with a combined groove, which is used to contact with the side of the battery module to form a plug-in fit when fixing the battery module; the second structural part is arranged on the second end face of the first structural part, and the length can be cut, which is used to adjust the length of the battery module fixing bracket when fixing the battery module, so that the battery module fixing bracket and the inner side wall of the battery box shell contact and form a supporting force.

2. The battery module fixing bracket according to claim 1, characterized in that: The width of the first structure portion is equivalent to the width of the cavity of the battery box shell, and the height of the first structure portion is equivalent to the height of the battery module.

3. The battery module fixing bracket according to claim 2, characterized in that: The combined grooves include rectangular grooves and special-shaped grooves; The length of the rectangular groove is equal to the height of the battery cell support of the battery module, the width of the rectangular groove is equal to the width of the battery cell support of the battery module, the rectangular groove abuts against the battery cell support of the battery module, and the horizontal movement of the battery module is restricted from three sides of the battery cell support; The special-shaped groove protrudes relative to the rectangular groove, and a connecting surface is formed between the special-shaped groove and the rectangular groove; the special-shaped groove and the exposed part of the battery cell of the battery module are opposite to each other, and are used to make way for the battery cell of the battery module, so that the first structural part and the exposed part of the battery cell of the battery module are not in direct contact, and the vertical movement of the battery module is restricted from the top or bottom of the battery cell holder.

4. The battery module fixing bracket according to claim 3, characterized in that: The special-shaped groove includes a plurality of continuous arc-shaped notches.

5. The battery module fixing bracket according to claim 1, characterized in that: The other four side surfaces of the first structure portion are planes.

6. The battery module fixing bracket according to claim 1, characterized in that: The second structural part includes four support columns of a stepped structure which are arranged at four corners.

7. The battery module fixing bracket according to claim 6, characterized in that: The number of steps of the support column is three or four.

8. The battery module fixing bracket according to claim 6, characterized in that: Countersunk holes corresponding to the support columns are arranged at four corners of the first end surface of the first structural part. When the fixing brackets are stacked, all or part of the support columns are hidden in the countersunk holes.

9. The battery module fixing bracket according to claim 1, characterized in that: The material of the battery module fixing bracket is ABS material.

10. A lithium battery box, characterized in that: It comprises a battery box shell, a battery module and at least two battery module fixing brackets as described in any one of claims 1 to 9; the battery module fixing brackets clamp the battery module from both sides of the battery module to fix the battery module at the bottom of the battery box shell.

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