Battery cell assembly and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell assembly and a battery pack, the battery cell assembly comprises a battery cell, the shell is provided with an opening and an end cover detachably covering the opening, and a second pole electrically connected with the first pole is arranged at the position, corresponding to the pole, of the shell; the battery cell is arranged in the shell and is matched with the internal space of the shell, and the first pole is propped against the second pole. According to the utility model, the battery cell is arranged in the shell, the end cover covers the opening and is detachable from the shell, the first pole of the battery cell is propped against the second pole of the shell to realize electric connection, and the second pole of the shell is connected with the busbar, so that the functions of mechanical and electric connection are transferred to the shell, and the battery cell is convenient to replace only through the electric connection of the battery cell and the shell.

Description

Technical Field

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

[0002] At present, the battery life and lifespan have attracted much attention due to the high cost of the battery. The current battery cells are fixed to the water-cooling plate by gluing, and the pole columns and the pole ears are welded. It is difficult to replace a single battery cell when it is damaged or its performance deteriorates. Summary of the Utility Model

[0003] In view of this, the utility model provides a battery cell assembly to solve the problem that it is difficult to replace a single battery cell when it is damaged or its performance deteriorates.

[0004] In a first aspect, the utility model provides a battery cell assembly, including:

[0005] A battery cell, on which a first pole column is provided;

[0006] A housing, having an opening and an end cover detachably covering the opening, and a second pole column electrically connected to the first pole column is provided at a position of the housing corresponding to the first pole column;

[0007] The battery cell is disposed in the housing and matches the internal space of the housing, and the first pole column abuts against the second pole column.

[0008] Beneficial effects: In the battery cell assembly of the utility model, the battery cell is disposed in the housing, the end cover covers the opening and is detachable from the housing, and the first pole column of the battery cell abuts against the second pole column of the housing to achieve electrical connection. The second pole column of the housing is connected to the bus bar, so as to transfer the functions of mechanical and electrical connection to the housing. Only the battery cell is electrically connected to the housing, which is convenient for replacing the battery cell. When the battery cell needs to be replaced, the end cover is opened, the battery cell to be replaced is taken out, and then a new battery cell is installed, so that the first pole column of the new battery cell abuts against the second pole column of the housing to achieve electrical connection.

[0009] In addition, since the battery cell matches the internal space of the housing, it is convenient to stably place the battery cell, avoid the situation that the battery cell shakes in the housing, and ensure the contact reliability between the first pole column of the battery cell and the second pole column of the housing.

[0010] In an optional embodiment, an elastic heat-conducting pad is provided at the bottom inside the housing, one end of the battery cell abuts against the elastic heat-conducting pad, and the other end abuts against the inner surface of the end cover.

[0011] Beneficial effects: By providing an elastic heat-conducting pad at the bottom of the outer shell, the bottom of the battery cell contacts the elastic heat-conducting pad, and the heat generated by the battery cell can be transferred to the outside through the elastic heat-conducting pad, thereby accelerating the heat dissipation of the battery cell. In addition, due to the certain elasticity of the elastic heat-conducting pad, when one end of the battery cell abuts against the elastic heat-conducting pad and the other end abuts against the bottom of the end cover, the end cover can apply pressure to the battery cell to compress the elastic heat-conducting pad, thereby pressing the battery cell tightly in the outer shell and ensuring the stability of the battery cell after installation.

[0012] In an alternative embodiment, a buffer pad is provided on the inner side wall of the outer shell, and the side wall of the battery cell abuts against the buffer pad.

[0013] Beneficial effects: By providing a buffer pad on the inner side wall of the outer shell, effective protection can be formed on the side wall of the battery cell. Even if the battery cell has a small amount of movement margin, it can be ensured that the battery cell will not collide with the outer shell by contacting the buffer pad. In addition, the buffer pad also has a certain heat-conducting effect, which can accelerate the heat dissipation of the battery cell.

[0014] In an alternative embodiment, the outer shell is a square outer shell, at least two opposite sides of the square outer shell are provided with the buffer pads, the battery cell is a square battery cell, the side walls of the square battery cell correspond to the side walls of the square outer shell one by one, and the side wall of the square battery cell facing the buffer pad abuts against the buffer pad.

[0015] Beneficial effects: Square battery cells are widely used in blade batteries. By providing a square outer shell that matches the square battery cell, the square battery cell can be positioned in all directions, and the anti-rotation effect is good. In addition, since the square battery cell has two opposite planes, it is convenient to paste and fix the buffer pad.

[0016] In an alternative embodiment, an explosion-proof valve is provided on the battery cell, and a through hole for the explosion-proof valve to be exposed is provided at a position of the outer shell opposite to the explosion-proof valve.

[0017] Beneficial effects: By providing a through hole in the outer shell, the explosion-proof valve is exposed from the through hole, so as not to affect the normal use of the explosion-proof valve and avoid blocking the explosion-proof valve during thermal runaway.

[0018] In an alternative embodiment, one of a clamping protrusion and a clamping groove is provided on each of the opposite sides of the outer shell outside the opening, and the other of the clamping protrusion and the clamping groove is provided on each of the opposite sides of the inner wall of the end cover. The end cover is detachably connected to the outer shell by clamping the clamping groove on the clamping protrusion.

[0019] Beneficial effects: By providing the snap protrusions and snap grooves, when closing the end cap, the snap grooves can be directly snapped onto the snap protrusions, thus realizing the detachable connection between the end cap and the housing. When disassembling, simply apply force to disengage the snap grooves from the snap protrusions.

[0020] In an alternative embodiment, the housing is a plastic housing, an installation opening is formed in the housing, a mounting plate is fixedly installed in the installation opening, and the second pole is provided on the mounting plate.

[0021] Beneficial effects: Compared with a metal housing, a plastic housing is beneficial for reducing the overall weight of the battery cell assembly. The plastic housing is easy to mold. By reserving the installation opening, it is convenient to install and fix the second pole on the mounting plate.

[0022] In an alternative embodiment, the elastic heat-conducting pad is a silicone rubber pad or a resin pad.

[0023] Beneficial effects: The silicone rubber pad or the resin pad has good heat conductivity and appropriate elasticity.

[0024] In an alternative embodiment, a positioning pad matching the opening is provided on the inner surface of the end cap, and the positioning pad abuts against one end of the battery cell facing the end cap.

[0025] Beneficial effects: By providing the positioning pad, together with the elastic heat-conducting pad, the two ends of the battery cell are positioned and protected, ensuring the stability of the battery cell after installation and providing a certain degree of protection to the battery cell, avoiding direct contact with the housing.

[0026] In a second aspect, the present utility model further provides a battery pack, including:

[0027] The above-mentioned battery cell assembly, and the bottom of the housing is bonded to the water-cooling plate.

[0028] Beneficial effects: By bonding the housing to the water-cooling plate, it replaces the previous scheme of bonding the battery cell to the water-cooling plate, without affecting the replacement of the battery cell inside the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a front view schematic diagram of a battery cell assembly according to an embodiment of the present utility model;

[0031] Figure 2 is Figure 1 the schematic cross-sectional view taken along line A-A;

[0032] Figure 3 is Figure 1 the schematic side view;

[0033] Figure 4 is the schematic three-dimensional structure view of a battery cell assembly according to an embodiment of the present utility model;

[0034] Figure 5 is the schematic view of a battery cell assembly according to an embodiment of the present utility model mounted on a water-cooling plate.

[0035] Explanation of reference numerals:

[0036] 1, battery cell; 101, explosion-proof valve; 2, outer shell; 201, end cap; 2011, clamping groove; 2012, positioning pad; 202, clamping protrusion; 203, mounting plate; 2031, second pole column; 204, through hole; 205, elastic heat-conducting pad; 206, buffer pad; 3, water-cooling plate. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] The current battery cell is fixed to the water-cooling plate by gluing. When a single battery cell is damaged or its performance deteriorates, there is a problem that it is difficult to replace.

[0039] To solve the above problems, the embodiments of the present utility model will be described below in conjunction with Figures 1 to 5 , to describe the embodiments of the present utility model.

[0040] According to an embodiment of the present utility model, on the one hand, as Figure 2 shown, a battery cell assembly is provided, mainly including a battery cell 1 and an outer shell 2.

[0041] Specifically, a first pole column (not shown in the figure) is provided on the battery cell 1. It can be understood that there is a pair of first pole columns, including a positive pole column and a negative pole column.

[0042] Specifically, the outer shell 2 has an opening and an end cap 201 detachably covering the opening. At a position corresponding to the first pole column on the outer shell 2, a second pole column 2031 electrically connected to the first pole column is provided. Correspondingly, there is also a pair of second pole columns 2031, including a positive pole column and a negative pole column.

[0043] The battery cell 1 of this embodiment is disposed inside the outer shell 2 and matches the internal space of the outer shell 2. The first pole column abuts against the second pole column 2031, that is, the positive pole column of the first pole column abuts against the positive pole column of the second pole column 2031, and the negative pole column of the first pole column abuts against the negative pole column of the second pole column 2031.

[0044] For the battery cell assembly of the present utility model, the battery cell 1 is disposed inside the outer shell 2, and the end cap 201 covers the opening and is detachably arranged with the outer shell 2. The first pole column of the battery cell 1 abuts against the second pole column 2031 of the outer shell 2 to achieve electrical connection. Through the second pole column 2031 of the outer shell 2, it is connected to the bus bar. Generally, automotive power batteries are formed by connecting hundreds of battery cells 1, and the interconnection of the battery cells 1 is mainly the soft connection of the bus bar + signal wire harness. Thus, the functions of mechanical and electrical connection are transferred to the outer shell 2, and only through the electrical connection between the battery cell 1 and the outer shell 2, it is convenient to replace the battery cell 1. When it is necessary to replace the battery cell 1, open the end cap 201 and pull out the battery cell 1 to be replaced, and then install a new battery cell 1, so that the first pole column of the new battery cell 1 abuts against the second pole column 2031 of the outer shell 2 to achieve electrical connection. Under the monitoring of the battery management system (BMS), the battery cells with degraded performance can be replaced in a timely manner, and the service life of the battery and the performance parameters during the service life can be improved at low cost.

[0045] In addition, since the battery cell 1 matches the internal space of the outer shell 2, it is convenient to stably place the battery cell 1, avoid the situation that the battery cell 1 shakes inside the outer shell 2, and ensure the contact reliability between the first pole column of the battery cell 1 and the second pole column 2031 of the outer shell 2.

[0046] In a specific embodiment, an elastic heat-conducting pad 205 is provided at the bottom inside the outer shell 2. One end of the battery cell 1 abuts against the elastic heat-conducting pad 205, and the other end abuts against the inner surface of the end cap 201. In this embodiment, by providing the elastic heat-conducting pad 205 at the bottom of the outer shell 2, the bottom of the battery cell 1 contacts the elastic heat-conducting pad 205, and the heat generated by the battery cell 1 can be transferred to the outside through the elastic heat-conducting pad 205, thereby accelerating the heat dissipation of the battery cell 1. In addition, since the elastic heat-conducting pad 205 has a certain elasticity, when one end of the battery cell 1 abuts against the elastic heat-conducting pad 205 and the other end abuts against the bottom of the end cap 201, the end cap 201 can apply pressure to the battery cell 1 to compress the elastic heat-conducting pad 205 by the battery cell 1, thereby pressing the battery cell 1 firmly in the outer shell 2 and ensuring the stability of the battery cell 1 after installation.

[0047] In a specific embodiment, a buffer pad 206 is provided on the inner side wall of the outer shell 2, and the outer side wall of the battery cell 1 abuts against the buffer pad 206.

[0048] In this embodiment, by providing a buffer pad 206 on the inner side wall of the outer shell 2, effective protection can be formed for the side wall of the battery cell 1. Even if the battery cell 1 has a small amount of movement margin, contact with the buffer pad 206 can ensure that the battery cell 1 does not collide with the outer shell 2. In addition, the buffer pad 206 can be made of a heat-dissipating material, such as a silicone rubber pad, which has a certain heat-conducting effect and can accelerate the heat dissipation of the battery cell 1, facilitating the cooling of the battery cell 1.

[0049] In a specific embodiment, the outer shell 2 is a square outer shell 2, and buffer pads 206 are provided on at least two opposite sides of the square outer shell 2. The battery cell 1 is a square battery cell 1, and the side walls of the square battery cell 1 correspond to the side walls of the square outer shell 2 one by one. The side wall of the square battery cell 1 facing the buffer pad 206 is in contact with the buffer pad 206.

[0050] The square battery cell 1 of this embodiment is widely used in blade batteries. By providing a square outer shell 2 that matches the square battery cell 1, the square battery cell 1 can be positioned in all directions with a good anti-rotation effect. In addition, since the square battery cell 1 has two pairs of opposite planes, it is convenient to paste and fix the buffer pad 206.

[0051] Furthermore, the buffer pad 206 can be adhesively bonded to the inner side wall of the square outer shell 2 by glue. The thickness of the buffer pad 206 can be determined according to the size of the battery cell 1, as long as the buffer pad 206 can fill the gap between the battery cell 1 and the inner side wall of the outer shell 2.

[0052] In a specific embodiment, as Figure 3 shown, an explosion-proof valve 101 is provided on the battery cell 1, and a through hole 204 for the explosion-proof valve 101 to be exposed is provided at a position on the outer shell 2 opposite to the explosion-proof valve 101. The shape of the through hole 204 is an oblong hole, which exactly matches the shape of the explosion-proof valve 101.

[0053] In this embodiment, by providing the through hole 204 on the outer shell 2, the explosion-proof valve 101 is exposed from the through hole 204, thus not affecting the normal use of the explosion-proof valve 101 and avoiding blocking the explosion-proof valve 101 during thermal runaway.

[0054] In a specific embodiment, one of a clamping protrusion 202 and a clamping groove 2011 is provided on each of the opposite sides of the outer shell 2 outside the opening, and the other of the clamping protrusion 202 and the clamping groove 2011 is provided on each of the opposite sides of the inner wall of the end cap 201. The end cap 201 is detachably connected to the outer shell 2 by being clamped in the clamping groove 2011 on the clamping protrusion 202.

[0055] Furthermore, the clamping protrusion 202 can be multiple spaced along the opposite sides of the outer shell 2, or can be a long strip extending along the opposite sides of the outer shell 2. The specific shape is not limited here too much.

[0056] In this embodiment, by providing a snap projection 202 and a snap groove 2011, when the end cover 201 is closed, the snap grooves 2011 on the opposite sides of the end cover 201 are directly snapped onto the snap projections 202 at the opening of the housing 2, thus realizing the detachable connection between the end cover 201 and the housing 2. When disassembling, just forcefully disconnect the snap groove 2011 from the snap projection 202.

[0057] In a specific embodiment, the housing 2 is a plastic housing. An installation opening is provided on the housing 2, and an installation plate 203 is fixedly installed in the installation opening. A second pole column 2031 is provided on the installation plate 203.

[0058] In this embodiment, compared with a metal housing 2, the plastic housing 2 is beneficial to reducing the overall weight of the battery cell assembly and achieving lightweight. The plastic housing 2 is easy to mold. By reserving the installation opening, it is convenient to install and fix the second pole column 2031 on the installation plate 203. Of course, the housing 2 can also be a metal housing 2, and an installation hole is provided on the metal housing 2 for installing the second pole column 2031. The corresponding effect can also be achieved.

[0059] In a specific embodiment, the elastic heat-conducting pad 205 is a silicone rubber pad or a resin pad.

[0060] In this embodiment, the silicone rubber pad or the resin pad has good heat conductivity and appropriate elasticity.

[0061] In a specific embodiment, a positioning pad 2012 matching the opening is provided on the inner surface of the end cover 201, and the positioning pad 2012 abuts against one end of the battery cell 1 facing the end cover 201.

[0062] In this embodiment, by providing the positioning pad 2012 and the elastic heat-conducting pad 205 to position and protect both ends of the battery cell 1, the stability of the battery cell 1 after installation is ensured and a certain protective effect on the battery cell 1 is achieved, avoiding direct contact with the housing 2.

[0063] According to an embodiment of the present invention, on the other hand, a battery pack is also provided, including:

[0064] The above-mentioned battery cell assembly, as Figure 5 shown, the bottom of the housing 2 is bonded to the water-cooling plate 3. By bonding the housing 2 to the water-cooling plate 3, the previous scheme of bonding the battery cell 1 to the water-cooling plate 3 is replaced, without affecting the replacement of the battery cell 1 inside the housing 2.

[0065] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cell component, characterized in that, Comprising: a battery cell, on which a first pole is provided; a housing, having an opening and an end cover detachably covering the opening, and a second pole electrically connected to the first pole is provided at a position of the housing corresponding to the first pole; the battery cell is disposed inside the housing and matches the internal space of the housing, and the first pole abuts against the second pole.

2. The cell assembly according to claim 1, wherein An elastic heat-conducting pad is provided at the bottom inside the housing, one end of the battery cell abuts against the elastic heat-conducting pad, and the other end abuts against the inner surface of the end cover.

3. The battery cell assembly according to claim 2, characterized in that, A buffer pad is provided on the inner side wall of the housing, and the side wall of the battery cell abuts against the buffer pad.

4. The cell assembly according to claim 3, wherein The housing is a square housing, and the buffer pads are provided on at least two opposite sides of the square housing. The battery cell is a square battery cell, and the side walls of the square battery cell correspond to the side walls of the square housing one by one. The side wall of the square battery cell facing the buffer pad abuts against the buffer pad.

5. The battery cell assembly according to any one of claims 1 to 4, characterized in that An explosion-proof valve is provided on the battery cell, and a through hole for the explosion-proof valve to be exposed is provided at a position of the housing opposite to the explosion-proof valve.

6. The battery cell assembly according to any one of claims 1 to 4, characterized in that, One of a clamping protrusion and a clamping groove is provided on each of the opposite sides outside the housing at the opening, and the other of the clamping protrusion and the clamping groove is provided on the opposite sides of the inner wall of the end cover. The end cover is detachably connected to the housing by being clamped in the clamping groove on the clamping protrusion.

7. The cell assembly according to any one of claims 1 to 4, characterized in that The housing is a plastic housing, an installation opening is provided on the housing, and an installation plate is fixedly installed in the installation opening, and the second pole is provided on the installation plate.

8. The cell assembly according to claim 2, wherein The elastic heat-conducting pad is a silicone rubber pad or a resin pad.

9. The cell assembly according to any one of claims 1 to 4, characterized in that, A positioning pad matching the opening is provided on the inner surface of the end cover, and the positioning pad abuts against one end of the battery cell facing the end cover.

10. A battery pack, characterized in that, Comprising: the battery cell assembly according to any one of claims 1 to 9, and the bottom of the housing is bonded to a water-cooling plate.

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