CN106601940B - Power battery top cover structure, power battery and battery module - Google Patents

Abstract

The application relates to the field of energy storage devices, and in particular to a power battery top cover structure, a power battery and a battery module including a top cover sheet, a first electrode assembly, a second electrode assembly, a second flexible electrical connector and a second connection block , the second flexible electrical connector has a second electrode assembly connecting part, a second deformation part and a second connecting block connecting part, the second electrode assembly connecting part is electrically connected with the second electrode assembly, and the second connecting block connecting part is connected with the second connecting block connecting part. The connection block is electrically connected, the second deformation part connects the second electrode assembly connection part and the second connection block connection part, and the second connection block can be displaced relative to the second electrode assembly. The power battery includes the power battery top cover structure. The battery module includes a bus bar and a plurality of the power batteries, and the plurality of second connection blocks are electrically connected through the bus bar. The top cover structure of the power battery provided by the present application can make the second connection block move relative to the second electrode assembly under the action of an external force.

Description

Power battery top cover structure, power battery and battery module

technical field

The present application relates to the field of energy storage devices, and in particular, to a power battery top cover structure, a power battery and a battery module.

Background technique

For electric vehicles, there are several ways to improve the mileage of the vehicle:

1. Improve the energy density of the battery;

2. In order to improve the space utilization rate of battery packs and battery modules, a larger volume of batteries can be accommodated in a limited space.

At present, hard-shell batteries are generally used in the industry. Considering the impact of battery expansion on battery life and safety during battery use, most of the module assemblies are made with the large surface of the battery close to the large surface under certain pressure. fixed together. Then the poles are connected through a Busbar (busbar). During the charging and discharging process of the battery, the battery will expand or contract, and the corresponding pole and busbar will be stressed. This requires that the Busbar or pole can be deformed.

Considering that the overcurrent capacity of the Busbar is relatively thick, basically 2-3mm, to achieve easy deformation, it must be made into an "Ω" shape with a high arch in the middle. In this way, for the same module space, since the arched part of the Busbar will occupy a larger space in the height direction, the available space of the battery will be reduced.

SUMMARY OF THE INVENTION

The present application provides a power battery top cover structure, a power battery and a battery module, which can solve the above problems.

A first aspect of the embodiments of the present application provides a power battery top cover structure, including a top cover sheet, a first electrode assembly, a second electrode assembly, a second flexible electrical connector, and a second connection block,

the first electrode assembly is electrically connected to the top cover sheet, the second electrode assembly is sealed and electrically insulated from the top cover sheet,

The second connection block is located above the second electrode assembly, the second connection block is electrically connected to the second electrode assembly through the second flexible electrical connection piece, and the second flexible electrical connection piece has A second electrode assembly connection part, a second deformation part and a second connection block connection part, the second electrode assembly connection part is electrically connected with the second electrode assembly, and the second connection block connection part is connected with the second electrode assembly The connection block is electrically connected, the second deformation part connects the second electrode assembly connection part and the second connection block connection part,

The second connection block can be displaced relative to the second electrode assembly under the action of an external force, and the second connection block connection part can move together with the second connection block and pull the second deformation part deformed.

Preferably, the three-dimensional Cartesian coordinate system includes mutually perpendicular X-axis, Y-axis and Z-axis, the length direction of the top cover sheet is the X-axis, the width direction is the Y-axis, and the thickness direction is the Z-axis,

The second deformation portion includes at least one second bending portion, and the projection of the second bending portion in one of the XY plane, the YZ plane and the XZ plane is a bending structure.

Preferably, the second flexible electrical connector is a sheet-like structure, and the plane on which the projection of the second bending portion is located is parallel to the thickness direction of the second bending portion forming the projection.

Preferably, the second deformation portion includes a second connecting portion and two second bending portions,

The projection of one of the second bending parts in the YZ plane is a bending structure, the projection of the other second bending part in the XZ plane is a bending structure, and the two second bending parts pass through The second connection parts are connected.

Preferably, the second electrode assembly includes a second pole, a second pole seal, and a second upper insulating member,

The second pole passes through the top cover sheet, and is sealed and insulated with the top cover sheet through the second pole seal member, and the second upper insulating member is located between the second connection block and the top cover sheet. Between the top cover sheets, the connecting portion of the second electrode assembly is electrically connected to the second pole.

Preferably, the connecting portion of the second connecting block is electrically connected to the lower surface or the upper surface of the second connecting block.

Preferably, the second connecting block has a second connecting hole or a second notch, and the second connecting block connecting portion passes through the second connecting hole or the second notch and the upper surface of the second connecting block electrical connection.

Preferably, the upper surface of the second connection block has a second connection groove, the connection part of the second connection block is electrically connected to the second connection groove, and the upper surface of the connection part of the second connection block does not exceed all the the upper surface of the second connection block.

Preferably, the second flexible electrical connection member includes a plurality of flexible connection sheets, and the plurality of flexible connection sheets are stacked in sequence and are fixedly connected to each other at least at both ends.

A second aspect of the embodiments of the present application provides a power battery, including the power battery top cover structure.

A third aspect of the embodiments of the present application provides a battery module, which includes a bus bar and a plurality of the power batteries, and the plurality of second connection blocks are electrically connected through the bus bar.

Preferably, the bus bar is a straight plate structure, and the upper surface of the second connection block is attached and connected to the bus bar.

The technical solutions provided in the embodiments of the present application can achieve the following beneficial effects:

The top cover structure of the power battery provided by the embodiment of the present application can make the second connecting block displace relative to the second electrode assembly under the action of external force, and perform relative displacement to absorb the force between the power battery and the bus bar, so the present application implements The top cover structure of the power battery provided by the example can use the bus bar of the straight plate structure to carry out the series or parallel connection of the power battery, which improves the space utilization rate of the battery module.

It is to be understood that the foregoing general description and the following detailed description are exemplary only and do not limit the application.

Description of drawings

FIG. 1 is a top-view structural schematic diagram of the top cover structure of the power battery provided in the first embodiment of the application;

2 is a schematic diagram of an explosion structure of the first power battery top cover structure provided in Embodiment 1 of the application;

3 is a schematic cross-sectional structural diagram of the top cover structure of the power battery shown in FIG. 2 along A-A in FIG. 1;

4 is a schematic diagram of an explosion structure of the second type of power battery top cover structure provided in Embodiment 1 of the present application;

5 is a schematic cross-sectional structural diagram of the top cover structure of the power battery shown in FIG. 4 along A-A in FIG. 1;

FIG. 6 is a schematic cross-sectional structural diagram of the top cover structure of the power battery shown in FIG. 4 along B-B in FIG. 1;

7 is a schematic cross-sectional structural diagram of the top cover structure of the power battery shown in FIG. 4 along C-C in FIG. 1;

8 is a schematic diagram of an explosion structure of the third power battery top cover structure provided in the first embodiment of the application;

FIG. 9 is a schematic cross-sectional structural diagram of the top cover structure of the power battery shown in FIG. 8 along A-A in FIG. 1;

FIG. 10 is a schematic cross-sectional structural diagram of the top cover structure of the power battery shown in FIG. 8 along B-B in FIG. 1;

11 is a schematic cross-sectional structural diagram of the top cover structure of the power battery shown in FIG. 8 along C-C in FIG. 1;

12 is a schematic diagram of an explosion structure of the fourth power battery top cover structure provided in the first embodiment of the application;

FIG. 13 is a schematic cross-sectional view of the top cover structure of the power battery shown in FIG. 12 along A-A in FIG. 1;

14 is a schematic diagram of an explosion structure of the fifth power battery top cover structure provided in the first embodiment of the application;

15 is a schematic side view of the structure of the first first flexible electrical connector/second flexible electrical connector provided in Embodiment 1 of the present application;

16 is a schematic side view of the structure of the second type of the first flexible electrical connector provided in the first embodiment of the application;

17 is a partial cross-sectional view along A-A in FIG. 1 near the first electrode assembly of the power battery top cover structure using the first flexible electrical connector shown in FIG. 16;

18 is a schematic side view of the structure of the third first flexible electrical connector provided in the first embodiment of the application;

19 is a partial cross-sectional view along A-A in FIG. 1 near the first electrode assembly of the power battery top cover structure using the first flexible electrical connector shown in FIG. 18;

20 is a schematic side view of the structure of the fourth first flexible electrical connector/second flexible electrical connector provided in Embodiment 1 of the present application;

21 is a partial cross-sectional view along A-A in FIG. 1 near the first electrode assembly of the power battery top cover structure using the first flexible electrical connector shown in FIG. 20;

22 is a partial cross-sectional view along B-B in FIG. 1 near the first electrode assembly of the power battery top cover structure using the first flexible electrical connector shown in FIG. 20;

23 is a schematic top-view structural diagram of the first power battery top cover structure provided in the second embodiment of the application;

24 is a schematic diagram of an explosion structure of the first power battery top cover structure provided in the second embodiment of the application;

FIG. 25 is a schematic cross-sectional view of the top cover structure of the power battery shown in FIG. 24 along A-A in FIG. 23;

26 is a schematic top-view structural diagram of the second power battery top cover structure provided in the second embodiment of the application;

27 is a schematic diagram of an explosion structure of the second type of power battery top cover structure provided in the second embodiment of the application;

Fig. 28 is a schematic cross-sectional view of the top cover structure of the power battery shown in Fig. 27 along A-A in Fig. 26;

29 is a schematic structural diagram of a first flexible electrical connector/second flexible electrical connector provided in Embodiment 2 of the present application;

30 is a schematic top-view structural diagram of a top cover structure of a power battery according to Embodiment 3 of the present application;

31 is a schematic diagram of an explosion structure of a power battery top cover structure provided in Embodiment 3 of the application;

FIG. 32 is a schematic cross-sectional structural diagram of the top cover structure of the power battery shown in FIG. 31 along A-A in FIG. 30 .

Reference number:

10 - the first electrode assembly;

100 - the first pole;

101-conductive sheet;

102 - the first pole seal;

103-The first lower insulating part;

104 - the first electrical connector;

105 - flip sheet;

106 - the first upper insulating part;

11- the first accommodating cavity;

12 - the first flexible electrical connector;

120 - the first electrode assembly connection part;

120a - the auxiliary connection part of the first electrode assembly;

122 - the first connecting block connecting part;

122a - the auxiliary connecting part of the first connecting block;

124, 124a, 124b - the first bend;

126 - the first connecting part;

128 - the first extension;

14- the first connection block;

140 - the first connection hole;

142 - the first connection slot;

144 - the first limit matching part/the first limit hole;

146 - blocking part;

148 - Department of Avoidance;

16- The first limit piece;

160 - the first limit column;

160a - lower fitting segment;

160b-upper mating segment;

162 - the first limit cap;

164 - the first annular gap;

166 - the second annular gap;

18 - the first elastic piece;

180 - the first radial elastic member;

182 - the first axial elastic member;

20- the second electrode assembly;

200 - the second pole;

202 - the second pole seal;

203-Second lower insulation;

206-The second upper insulating part;

21- the second accommodating cavity;

22 - the second flexible electrical connector;

220 - the second electrode assembly connecting part;

220a - the auxiliary connecting part of the second electrode assembly;

222 - the connecting part of the second connecting block;

222a - the auxiliary connecting part of the second connecting block;

224, 224a, 224b—the second bent portion;

226 - the second connecting part;

24- the second connection block;

240 - the second connection hole;

242 - the second connection slot;

244 - the second limit matching part;

26-Second limiter;

260-Second limit post;

262-Second limit cap;

28 - the second elastic piece;

280 - the second radial elastic member;

282 - the second axial elastic member;

30 - top cover sheet;

300 - Flip sheet attachment hole.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

Detailed ways

The present application will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. The "front", "rear", "left", "right", "top" and "bottom" mentioned in the text are all based on the top cover structure of the power battery in the accompanying drawings.

Example 1

As shown in FIGS. 1 to 22 , firstly, the embodiments of the present application define mutually perpendicular X-axis, Y-axis and Z-axis in a three-dimensional rectangular coordinate system. The embodiments of the present application provide a power battery top cover structure, including a first electrode The assembly 10 , the first flexible electrical connector 12 , the first connecting block 14 , the second electrode assembly 20 , the second flexible electrical connector 22 , the second connecting block 24 and the top cover sheet 30 . The longitudinal direction of the top cover sheet 30 is the X axis, the width direction is the Y axis, and the thickness direction is the Z axis.

The first electrode assembly 10 , the first flexible electrical connector 12 and the first connecting block 14 are responsible for one pole output of the power battery, while the second electrode assembly 20 , the second flexible electrical connector 22 and the second connecting block 24 are responsible for the power battery the other pole output. In this embodiment, the first electrode assembly 10 is connected to the positive electrode of the power battery, and the second electrode assembly 20 is connected to the negative electrode of the power battery as an example for description, but it should be emphasized that in other embodiments, the first electrode assembly 10 and the The connection objects of the second electrode assembly 20 can also be exchanged with each other. It should be noted that the structures of the first electrode assembly 10 and the second electrode assembly 20 described below can also be correspondingly exchanged according to the exchange of their connection objects.

In this embodiment, the first electrode assembly 10 and the top cover sheet 30 are hermetically connected to prevent liquid leakage. At the same time, the first electrode assembly 10 and the top cover sheet 30 can be connected in an insulating manner, and can also be electrically connected. When the first electrode assembly 10 is connected to the positive electrode of the power battery, the electrical connection between the first electrode assembly 10 and the top cover sheet 30 can positively charge the top cover sheet 30 and prevent the top cover sheet 30 from being corroded. The second electrode assembly 20 is electrically insulated from the top cover sheet 30 to prevent the positive and negative electrodes of the power battery from being directly connected. Of course, sealing is also required to prevent liquid leakage.

In this embodiment, the first connection block 14 is located above the first electrode assembly 10 as a component connected to the bus bar. The position of the first connection block 14 is not fixed, but can be moved within a certain range. The first flexible electrical connecting member 12 is used to ensure that the first electrode assembly 10 and the first connecting block 14 can still be electrically connected after the position of the first connecting block 14 is changed.

As shown in FIGS. 6 , 10 , 16 to 22 , the first flexible electrical connector 12 includes a first electrode assembly connecting portion 120 , a first connecting block connecting portion 122 and a first deformation portion (not numbered in the drawings), the first electrode The assembly 10 is electrically connected to the first electrode assembly connecting portion 120 , the first connecting block 14 is electrically connected to the first connecting block connecting portion 122 , and the first deformation portion connects the first electrode assembly connecting portion 120 and the first connecting block connecting portion 122 . The first deformation portion has flexible deformation capability and can be deformed under the action of external force.

When a plurality of power batteries adopting this kind of power battery top cover structure form a battery module, they will be attached and connected to the upper surfaces of the plurality of first connection blocks 14 through the bus bars at the same time. Since the first connection blocks 14 are fixed to the bus bars Connected together, the bus bar adopts a straight plate structure that is not easily deformed, so the first connection block 14 is fixed at this time. 10 and the first connecting block 14 cannot produce relative displacement), as the expansion force increases, it will break in the weak area (for example, at the connection between the bus bar and the first connecting block 14), so that the power battery cannot be output. However, with the top cover structure of the power battery in the embodiment of the present application, since the relative displacement between the first connecting block 14 and the first electrode assembly 10 can occur, the output of the power battery will not be affected when the power battery expands.

Taking the top cover sheet 30 as a reference, when the first connecting block 14 is displaced relative to the top cover sheet 30, since the first connecting block connecting portion 122 is connected with the first connecting block 14, the first connecting block is connected. The connecting portion 122 will move together with the first connecting block 14, and at this time, the first electrode assembly 10 is fixed relative to the top cover sheet 30, so the connecting portion 120 of the first electrode assembly is also fixed, so that the first electrode assembly 10 is fixed. A relative displacement occurs between the electrode assembly connecting part 120 and the first connecting block connecting part 122 , and the offset of the relative displacement is absorbed and supplemented by the deformation of the first deformation part, so as to avoid the direct fracture of the first flexible electrical connection part 12 loss of electrical conductivity.

When the power battery is used, a large current is often passed. In order to ensure the overcurrent capability, the first flexible electrical connector 12 generally needs to have a large overcurrent area, and an excessively large overcurrent area will lead to the first flexible electrical connector. The three-dimensional size of the first flexible electrical connector 12 is too large, which is not conducive to deformation. Therefore, in order to smoothly deform the first flexible electrical connector 12, the first flexible electrical connector Bend deformation.

The first deforming portion generally includes at least one first bending portion 124. According to the desired deformation direction, the projection of the first bending portion 124 in one of the XY plane, the YZ plane and the XZ plane can be a bending structure. . Specifically, for example, the projection of a certain first bending portion 124 in the XY plane is a bending structure, and the first bending portion 124 can generate deformation amounts along the X-axis and the Y-axis. In the same way, the projection in the YZ plane is a bending structure, which can generate deformation along the Y-axis and Z-axis, and the projection in the XZ plane is a bending structure, which can generate deformation along the X-axis and Z-axis. shape variable. It should be noted that, if the projection of the first bending portion 124 in the XY plane is a bending structure, in order to have a larger flow area, the first bending portion 124 needs to have a larger size in the Z-axis direction. , which takes up a lot of space.

It can be seen from this that a first bending portion 124 can generally ensure the generation of two-dimensional deformations. However, in order to realize any movement of the first connecting block 14 in the three-dimensional coordinate system, the first deformation portion needs to be able to simultaneously move along the The X-axis, Y-axis and Z-axis generate deformation amounts, so if only one first bending part 124 is used, either the first flexible electrical connector 12 also has other deformation structures, or the first deformation part can be simultaneously along the X axis. Axes, Y-axis, and Z-axis generate deformation quantities.

For the first one (the first flexible electrical connector 12 also has other deformation structures), it may be considered to obtain the deformation amount in the third dimension by using the twist of the first flexible electrical connector 12 itself. However, such twisting will generate a relatively large tearing force, which may cause the occurrence between the first electrode assembly connecting portion 120 and the first electrode assembly 10 , or between the first connecting block connecting portion 122 and the first connecting block 14 . Tear phenomenon, weaken the connection strength, or even disconnect the connection completely. By increasing the number of the first bending parts 124 of the first flexible electrical connector 12 , the twisting ability of the first flexible electrical connector 12 can be increased to a certain extent (see FIGS. 16 to 19 ), and the first flexible electrical connector 12 can also be increased. The deformability of the flexible electrical connector 12 .

For the second one (the first deformation part can generate deformation along the X axis, the Y axis and the Z axis at the same time), it is generally necessary to design the size of the first bending part 124 in the third dimension to be smaller, for example, the first bending part 124 needs to be designed to be smaller. The bent portion 124 is designed in a wire or strip shape, so that the first bent portion 124 can also be bent in the third dimension. However, on the one hand, this design will reduce the strength of the first flexible electrical connector 12, and on the other hand, it will also cause the overcurrent area of the first flexible electrical connector 12 to be too small, the resistance will be too high, and the risk of being blown .

Therefore, as shown in FIG. 20 , the first flexible electrical connector 12 adopts a sheet-like structure as a whole, and at the same time, the first deforming portion includes a first connecting portion 126 and two first bending portions 124 a and 124 b. The projections of the bending portions 124a and 124b on different planes are respectively bent structures, and the planes on which the projections of the bending structures formed by the first bending portions 124a and 124b are located are different from the first bending portions 124a and 124b themselves. The thickness directions are parallel, enabling deformation in three dimensions. Specifically, the projection of the first bending portion 124a in the XZ plane is a bending structure, and at the same time, the thickness direction of the first bending portion 124a changes with the shape of the first bending portion, but is always parallel to the XZ The projection of the first bending portion 124b in the YZ plane is a bending structure, and at the same time, the thickness direction of the first bending portion 124b is always parallel to the YZ direction. The first bending portions 124a and 124b are both connected to the first connecting portion 126 through one end, the first electrode assembly connecting portion 120 is connected to the end of the first bending portion 124a away from the first connecting portion 126, and the first connecting block connecting portion 122 It is connected with one end of the first bending portion 124b away from the first connecting portion 126 .

In this way, when the first connecting block 14 is displaced in the X-axis direction, the first bending portion 124a can be deformed, and when the first connecting block 14 is displaced in the Y-axis direction, the first bending portion 124b can be deformed, When the first connecting block 14 is displaced in the Z-axis direction, the first bending portions 124a and 124b can be deformed simultaneously.

In this embodiment, the first flexible electrical connecting piece 12 can be made of a single piece of material, or can be formed by stacking several thin flexible connecting pieces in sequence. No matter which method is adopted, the first flexible electrical connecting piece 12 The total thickness is preferably kept in the range of 0.1 to 1 mm, preferably in the range of 0.2 to 0.6 mm. These flexible connecting pieces are fixedly connected to each other at least at both ends, and the middle part, especially the part at the first bending part 124a, can move independently of each other to improve the deformability of the first flexible electrical connecting piece 12 .

In this embodiment, since the first flexible electrical connector 12 in this embodiment does not participate in the sealing connection between the first electrode assembly 10 and the top cover sheet 30, the deformation of the first flexible electrical connector 12 will not affect the top cover. The sealing performance of the cover sheet 30 .

There are many ways to seal and electrically connect the first electrode assembly 10 and the top cover sheet 30 , and the following ways are recommended in this embodiment.

Mode 1, as shown in FIGS. 2 and 3 , directly integrates the first electrode assembly 10 with the top cover sheet 30 , for example, uses stamping or other processing techniques to form the first electrode assembly 10 on the top cover sheet 30 . Since the first electrode assembly 10 and the top cover sheet 30 are integrated, the problems of sealing and electrical connection can be completely solved, and at the same time, this method can greatly simplify the assembly process and reduce the space occupied by the first electrode assembly 10 . At this time, the first electrode assembly 10 only needs to have the first pole post 100 without other components.

Mode 2, the first electrode assembly 10 includes a first pole 100 , a first pole seal 102 and a first electrical connector 104 , the first pole 100 passes through the top cover 30 and passes through the first pole seal 102 is hermetically connected to the top cover sheet 30, and the first pole post 100 is electrically connected to the top cover sheet 30 through the first electrical connector 104, so that the top cover sheet 30 is positively charged. The pole 100 is electrically connected. The first electrical connector 104 may be located above the top cover sheet 30 or below the top cover sheet 30 . Generally, the first electrical connector 104 and the top cover sheet 30 are in direct contact and electrically connected.

As shown in FIG. 4 and FIG. 5 , the first electrical connector 104 is located below the top cover sheet 30 and between the bottom of the first pole 100 and the lower surface of the top cover 30 , thereby connecting the first pole 100 The bottom is electrically connected to the lower surface of the top cover sheet 30 . At this time, a first upper insulating member 106 disposed between the first connecting block 14 and the top cover sheet 30 can be used to insulate the first connecting block 14 from the top cover sheet 30, while leaving the first flexible electrical connection member 12 assembly space.

As shown in FIGS. 8 and 9 , the first electrical connector 104 is located above the top cover sheet 30 , more specifically, between the top cover sheet 30 and the first connection block 14 , and the first pole 100 passes through at the same time The top cover sheet 30 and the first electrical connector 104 , at this time, the first electrical connector 104 is in contact with and electrically connected to the side of the first pole 100 , and the first electrode assembly connecting portion 120 is electrically connected to the top of the first pole 100 . connect.

In addition, when the first electrical connector 104 is located above the top cover sheet 30, the first electrical connector 104 may also be indirectly electrically connected to the first pole 100 through the first flexible electrical connector 12, the first connecting block 14, etc. connect. For example, the first pole 100 is passed through the first electrical connector 104 but is not directly electrically connected to it, the first electrode assembly connecting part 120 is in contact with the first pole 100, and the first connecting block connecting part 122 is electrically connected to the first pole 100. A connecting block 14 is in contact and electrically connected, and the first electrical connecting member 104 is in contact with and electrically connected to the top cover sheet 30 and the first connecting block 14 at the same time, so that the first electrical connecting member 104 passes through the first connecting block 14 and the first flexible electrical connection. The connecting member 12 is indirectly electrically connected to the first pole 100 .

When the power battery is pierced, a piercing circuit will be formed through the top cover sheet 30 and the first electrode assembly 10. If the resistance in the piercing circuit is too small, the current in the piercing circuit is too large, and the piercing point is easy. Sparking will cause the cell to run out of control. Therefore, when piercing the nail, a large resistor needs to be connected to the piercing circuit. Therefore, the first electrical connection member 104 in the second method can be designed as a resistance member with a relatively large resistance (1-100000Ω), so as to increase the resistance in the circuit and reduce the current.

When the first electrical connection member 104 is located under the top cover sheet 30 , it is actually located inside the power battery, because in consideration of reducing the volume, the first electrical connection member 104 may be in the form of a resistance block. When the first electrical connector 104 is located above the top cover sheet 30 , conductive plastic may be used to protect the first flexible electrical connector 12 and provide buffers for the movement of the first connecting block 14 on the other hand.

In the above solution, in order to prevent the bottom of the first pole 100 from directly contacting the top cover sheet 30 and short-circuiting the resistance, a first lower insulation can be provided between the bottom of the first pole 100 and the lower surface of the top cover sheet 30 103 for insulation.

During the use of the power battery, there may be an overcharge problem. Overcharging will cause the interior of the power battery to heat up and increase the pressure, causing the power battery to catch fire and explode. In order to avoid this problem, the first electrode assembly 10 and the top cover sheet 30 can also be optimally designed in this embodiment. As shown in FIGS. 12 to 14 , the first electrode assembly 10 includes a conductive sheet 101 , a first lower The insulating member 103, the first electrical connecting member 104 and the flip sheet 105 are provided with a flip sheet connection hole 300 on the top cover sheet 30, the flip sheet 105 seals the flip sheet connection hole 300, and the first lower insulating member 103 is located on the top cover sheet 30 and connected to the top cover sheet 30 , the conductive sheet 101 is insulated and fixed to the top cover sheet 30 through the first lower insulating member 103 , and at the same time, the conductive sheet 30 is also electrically connected to the flip sheet 105 . The first electrical connector 104 is located above the top cover sheet 30 and covers the connection hole 300 of the flip sheet. The first electrical connector 104 is electrically connected to the top cover sheet 30 , and the first electrode assembly connecting portion 120 is connected to the first electrical connector 104 electrical connection.

The power of the positive electrode of the power battery is output by the conductive sheet 101, and then transported to the top cover sheet 30 through the flip sheet 105, and then transported from the top cover sheet 30 to the first electrical connector 104, and finally to the first flexible electrical connector 12. The first connection block 14 . When the internal pressure of the power battery exceeds the reference pressure, the flip sheet 105 can flip over and disconnect the electrical connection with the conductive sheet 101 , thereby interrupting the conveying path of the positive electrode and releasing the overcharge state of the power battery. In order to ensure that the flip sheet 105 can be turned over smoothly and disconnect the electrical connection with the conductive sheet 101, the conductive sheet 101 is preferably provided with a weak area. When the flip sheet 105 is flipped over, the weak area will be broken due to stress concentration, so that the flip sheet 105 turned up smoothly.

In this embodiment, as shown in FIGS. 16 to 19 , the first connecting block connecting portion 122 may be connected to the lower surface of the first connecting block 14 , for example, the first connecting block 14 and the first electrode assembly 10 are enclosed by A first accommodating cavity 11 , and the first flexible electrical connector 12 is placed in the first accommodating cavity 11 .

However, in the above structure, the volume and structure of the first flexible electrical connector 12 need to be restricted by the first accommodating cavity 11 , which may affect the movement range of the first connecting block 14 . At this time, the space of the first accommodating cavity 11 can be expanded by arranging the escape portion 148 on the lower surface of the first connection block 14 (see FIGS. 17 and 19 ). However, due to the limited thickness of the first connection block 14 itself, the escape portion The depth of 148 is not too large, at most it can only penetrate the first connecting block 14 , and the space expansion capability of the first accommodating cavity 11 is limited.

As shown in FIGS. 1 to 14 , 20 to 22 , in this embodiment, the first connection block connecting portion 122 can also be electrically connected to the upper surface of the first connection block 14 , that is, the first flexible electrical connection piece A part of 12 can protrude out of the area between the first electrode assembly 10 and the first connection block 14, so the first flexible electrical connector 12 can have a larger size and a more complex structure, so as to be able to adapt to the first connection block 14 Larger moves.

As shown in FIGS. 8 to 11 and FIG. 14 , in order to enable the first connecting block connecting portion 122 to reach the upper surface of the first connecting block 14 smoothly, a first connecting hole 140 may be provided on the first connecting block 14 . The connecting block connecting portion 122 is electrically connected to the upper surface of the first connecting block 14 after passing through the first connecting hole 140 . As shown in FIGS. 1 to 7 , 12 to 13 , and 20 to 22 , the first connecting block connecting portion 122 can also be wound from the bottom of the first connecting block 14 to the top of the first connecting block 14 via one side of the first connecting block 14 surface, and is electrically connected to the upper surface of the first connection block 14 .

If the first connecting block connecting portion 122 is directly wound from one side of the first connecting block 14 to the upper surface of the first connecting block 14 , a part of the first flexible electrical connecting member 12 may protrude out of the first connecting block 14 , this part is easily damaged by external action. In this regard, the structure of the first connection block 14 can be optimized so that a first notch (not numbered in the figure) recessed inward is formed on one side, and the first flexible electrical connector 12 can be surrounded by the first notch. Through the first connecting block 14, it will not protrude out of the first connecting block 14, so as to obtain good protection. In order to save space and improve overall cleanliness, the first notch and the first flexible electrical connector 12 preferably conform to the shape.

In order to facilitate the connection between the first connecting block 14 and the bus bar, the upper surface of the first connecting block 14 is preferably kept flat. Therefore, there is preferably a first connecting groove 142 on the upper surface of the first connecting block 14. When the connecting block connecting portion 122 is connected to the upper surface of the first connecting block 14, the first connecting block connecting portion 122 is electrically connected to the first connecting groove 142, so that the upper surface of the first connecting block connecting portion 122 does not exceed the first connecting portion upper surface of block 14 . Preferably, the first connecting groove 142 and the connecting portion 122 of the first connecting block are conformable.

In this embodiment, the second connection block 24 is located above the second electrode assembly 20 and also serves as a component connected to the bus bar. The bus bar connected to the second connection block 24 also adopts a straight plate structure. When the power battery expands, the position between the second connection block 24 and the bus bar is fixed. In order to prevent the weak area between the second connection block 24 and the bus bar from being broken due to the displacement of the second connection block 24 with the expansion of the power battery, the second flexible electrical connector 22 is used in the embodiment of the present application. The second electrode assembly 20 and the second connecting block 24 are connected, so that the relative position between the second connecting block 24 and the second electrode assembly 20 can be changed, so that the output of the power battery will not be affected when the power battery expands.

Please continue to refer to FIGS. 1 to 22. Similar to the structure of the first flexible electrical connector 12, the second flexible electrical connector 22 includes a second electrode assembly connecting portion 220, a second connecting block connecting portion 222, and a second deformation portion ( (not numbered in the figure), the second electrode assembly 20 is electrically connected to the second electrode assembly connecting portion 220 , and the second connecting block 24 is electrically connected to the second connecting block connecting portion 222 . The second deformation portion has flexible deformation capability and can be deformed under the action of external force.

When a plurality of power batteries adopting this power battery top cover structure form a battery module, they will also be connected to the upper surfaces of the plurality of second connection blocks 24 through the bus bar at the same time. When the power battery expands, the second The electrode assembly 20 will also be displaced, and since the second connection block 24 is connected with the bus bar, the second connection block 24 is fixed, which makes the gap between the second connection block 24 and the second electrode assembly 20 Relative displacement also occurs.

Taking the top cover sheet 30 as a reference, when the second connecting block 24 is displaced relative to the top cover sheet 30, since the second connecting block connecting portion 222 is connected with the second connecting block 24, the second connecting block is connected. The connecting portion 222 will move together with the second connecting block 24, and at this time, the second electrode assembly 20 is fixed relative to the top cover sheet 30, so the connecting portion 220 of the second electrode assembly is also fixed, so that the second electrode assembly 20 is fixed. A relative displacement occurs between the electrode assembly connecting portion 220 and the second connecting block connecting portion 222 , and the offset of the relative displacement is absorbed and supplemented by the deformation of the second deforming portion, so as to avoid direct rupture of the second flexible electrical connector 22 loss of electrical conductivity.

In order to reduce the resistance, the second flexible electrical connector 22 generally needs to have a large overcurrent area, and an excessively large overcurrent area will cause the three-dimensional size of the second flexible electrical connector 22 to be too large, which is not conducive to deformation. Therefore, In order to smoothly deform the second flexible electrical connector 22 , the size of the second flexible electrical connector 22 in at least one dimension (eg, thickness) should be smaller in order to be deformed by bending.

Similar to the first flexible electrical connector 12 , the second flexible electrical connector 22 may also adopt a sheet-like structure, and the second deformation portion may also have a second bending portion 224 and a second connecting portion 226 , and the second bending portion 226 The number, arrangement and function of the folded portions 224 can also be designed with reference to the first folded portion 124 , for example, a second folded portion 224 a and a second folded portion 224 b are provided. In this embodiment, the second flexible electrical connection member 22 may be made of a single piece of sheet material, or may be formed by stacking several thin flexible connection sheets in sequence, which will not be repeated here.

Since the second flexible electrical connector 22 in this embodiment does not participate in the sealing connection between the second electrode assembly 20 and the top cover sheet 30, the deformation of the second flexible electrical connector 22 will not affect the sealing of the top cover sheet 30 either. sealing performance.

In this embodiment, the second electrode assembly 20 includes a second pole 200 , a second pole seal 202 and a second upper insulating member 206 . The second pole 200 passes through the top cover sheet 30 and passes through the second pole The sealing member 202 is connected with the top cover sheet 30 in a sealed and insulated connection, and the second upper insulating member 206 is located between the second connection block 24 and the top cover sheet 30 to ensure the electrical insulation between the second connection block 24 and the top cover sheet 30. The two-electrode assembly connecting portion 220 is electrically connected to the second pole 200 . Meanwhile, a second lower insulating member 203 may also be provided between the bottom of the second pole 200 and the lower surface of the top cover sheet 30 for insulation.

Like the first flexible electrical connector 12 , the second connecting block connecting portion 222 of the second flexible electrical connector 22 can be connected to the lower surface of the second connecting block 24 , for example, between the second connecting block 24 and the second electrode assembly 20 . A second accommodating cavity 21 is formed therebetween, and the second flexible electrical connector 22 is placed in the second accommodating cavity 21 .

At the same time, the second connecting block connecting portion 222 can also be electrically connected to the upper surface of the second connecting block 24. For example, a second connecting hole 240 is provided on the second connecting block 24, and the second connecting block connecting portion 222 passes through the second connecting block 24. The two connection holes 140 are then electrically connected to the upper surface of the second connection block 24 . Alternatively, the second connecting block connecting portion 222 is wound from below the second connecting block 24 to the upper surface of the second connecting block 24 through one side of the second connecting block 24 , and is electrically connected to the upper surface of the second connecting block 24 . In order to protect the second flexible electrical connector 22 , a second notch (not numbered in the figure) may also be provided on the side of the second connecting block 24 , and its arrangement and function are the same as the first notch on the first connecting block 14 .

In order to facilitate the connection between the second connecting block 24 and the bus bar, the upper surface of the second connecting block 24 is preferably kept flat, and preferably also has a second connecting groove 242 on the upper surface of the second connecting block 14. The second connecting block The connecting portion 222 is electrically connected to the second connecting groove 242 , so that the upper surface of the connecting portion 222 of the second connecting block does not exceed the upper surface of the second connecting block 24 .

In this embodiment, the first connection block 14 and the second connection block 24 are flexibly connected by the first flexible electrical connector 12 and the second flexible electrical connector 22 , so that the first connection block 14 and the second connection block 24 can be connected to each other on the premise of maintaining the electrical connection state. The two connecting blocks 24 obtain a certain amount of displacement along the X-axis, the Y-axis and the Z-axis, so as to better absorb the force between them and the busbars caused by the expansion and absorption of the battery.

Embodiment 2

The second embodiment of the present application has a structural improvement on the basis of the first embodiment. In the first embodiment, although the first connecting block 14 has the ability to move, if the movement of the first connecting block 14 exceeds the deformation ability of the first flexible electrical connecting member 12, the first flexible electrical connecting member 12 has the ability to move. Fractures may occur, or the electrical connection with the first connection block 14 and the first electrode assembly 10 may be disconnected, and no matter what happens, the first connection block 14 will no longer be able to communicate with the positive electrode of the power battery. Similarly, the second connection block 24 also has the possibility of this happening. Therefore, it is necessary to limit the specific movement range of the first connection block 14 and the second connection block 24, so that they can only be within a reasonable range. make a move.

In order to solve the above problems, as shown in FIGS. 23 to 25 , in addition to the structure of the first embodiment, the top cover structure of the power battery provided in this embodiment also includes a first limiting member 16 and a second limiting member 26 . The first connection block 14 is provided with a first limit matching portion 144 , the first limit matching portion 144 can be connected with the first limit member 16 , and the two can restrict each other after the connection, so that the first limit member 16 can limit the movement of the first limit matching portion 144 . Since the first connecting block connecting portion 122 and the first connecting block 14 are electrically connected together, the two move together and restrict the first limit fitting portion 144, which means that the movement of the first connecting block 14 is limited by limit.

As shown in FIG. 24 , the first limit matching portion 144 is a first limit hole (for ease of understanding, the reference numeral 144 is used below), and the first limit member 16 includes a first limit post 160 and a first limit The cap 162, the first limiting post 160 is fixedly disposed relative to the top cover sheet 30, for example, directly fixed on the top cover sheet 30, or fixed on the first electrical connection member 104 or the first upper insulating member 106 of the first electrode assembly 10 In other words, the first limiting column 160 can be adapted to the first electrode assembly 10 of various structures in the first embodiment, and is not limited to the first electrode assembly 10 including the conductive sheet 101 and the flip sheet 105 . The first limiting cap 162 is located on the side of the first connecting block 14 away from the top cover sheet 30 . The first limiting post 160 passes through the first limiting hole 144 along the Z axis and is riveted and welded with the first limiting cap 162 . Or fixedly connected in other ways, the first limiting column 160 and the first limiting cap 162 can limit the movement of the first connecting block 14 along the Z-axis direction.

Since the first upper insulating member 106 is generally made of insulating plastic, the first limiting member 16 and the first upper insulating member 106 can be integrally formed to improve assembly efficiency. The first limiting member 16 is insulated from the first upper insulating member 106 . Pieces 106 may be of the same material or of a different material.

Here, the ways of restricting the movement of the first limit hole 144 are mainly divided into two categories. The first category is the movement of the first limit hole 144 along the X-axis and the Y-axis, that is, the radial movement relative to the first limit post 160 . , the second type is the movement of the first limiting hole 144 along the Z direction, that is, the axial movement relative to the first limiting post 160 . According to requirements, the first limiting member 16 can completely restrict one type of movement of the first limiting hole 144 (for example, the first limiting hole 144 cannot be moved along the X-axis, the Y-axis at all, or completely cannot be moved along the X-axis and the Y-axis. Z-axis movement), while allowing the first limiting hole 144 to perform another type of movement of a certain magnitude. Of course, it is better to enable the first limiting hole 144 to move to a certain extent in the three dimensions of XYZ.

Specifically, for the first type of movement mode, the diameter of the first limiting hole 144 needs to be larger than the diameter of the first limiting column 160 , and a first ring can be formed between the first limiting hole 144 and the first limiting column 160 . Due to the existence of the first annular gap 164, the first limiting hole 144 can move along the radial direction of the first limiting column 160, and the movement range is equal to the first limiting hole 144 and the first limiting column 160, so as to limit the movement amount of the first limiting hole 144 along the XY direction.

For the second type of movement, in this embodiment, the first limit post 160 with a larger size in the Z-axis direction can be used to fit the first limit hole 144 with a smaller size in the Z-axis direction, so that the first limit hole 144 can It moves along the axial direction of the first limiting column 160. At the same time, since one end of the first limiting column 160 is fixed, and the other end is fixed with the first limiting cap 162, the first connecting block 14 actually Therefore, it cannot be separated from the first limiting column 160 , and can only move within the axial dimension range of the first limiting column 160 .

As shown in FIG. 25 , in consideration of the flatness of the upper surface of the first connecting block 14 , in this embodiment, the first limiting cap 142 is located in the first limiting hole 144 , and at the same time a barrier is provided in the first limiting hole 144 The portion 146 is used for blocking the first limiting cap 142 from escaping from the first limiting hole 144 from below. Since the first limiting cap 142 is located in the first limiting hole 144 , the upper surface of the first limiting cap 142 may not exceed the upper surface of the first connecting block 14 .

If only one set of the first limiting member 16 and the first limiting matching portion 144 are provided, the rotation of the first connecting block 14 in the XY plane may not be restricted. The first connecting block 14 is provided with a plurality of first limit matching portions 144 , and the first limit members 16 are connected with the first limit matching portions 144 one by one, which can solve this problem and make the first connecting block Rotation of 14 in the XY plane is also limited.

The number of the first limiting member 16 and the first limiting matching portion 144 is preferably an even number, such as two, symmetrically distributed on both sides of the first flexible electrical connector 12 along the X axis. A first accommodating cavity 11 is formed between a connecting block 14 , and the first limiting member 16 can also be directly disposed relative to the first accommodating cavity 11 . Since the length direction of the top cover sheet 30 is along the X-axis direction, there is ample space in the X-axis direction, so that on the one hand, the first flexible electrical connector 12 can be avoided, and on the other hand, the first flexible electrical connector can be avoided. 12 forms protection.

During the power transmission process, the first flexible electrical connector 12 will continue to generate heat. If the heat cannot be dissipated in time, it may cause the first flexible electrical connector 12 to overheat or even fuse. In order to avoid this problem, as shown in FIG. 29 , A first extension portion 128 may be provided on the first flexible electrical connector 12, and the first extension portion 128 is located between the first electrode assembly connection portion 120 and the first connection block connection portion 122, as shown in FIGS. 26 to 28, assembled. During the process, due to the first limit, 16 is arranged on both sides of the first flexible electrical connector 12 along the X axis, so in order to avoid the first limit 16, at least a part of the first flexible electrical connector 12 is along the Y axis The first extension portion 128 extends beyond the first accommodating cavity 11 and extends along the X-axis to increase the heat dissipation area and improve the heat dissipation efficiency.

Moreover, if the first deformed portion has a first bending portion 124a projected in the XZ plane as a bending structure, at least one first bending portion 124a protrudes out of the first accommodating cavity 11, and this The first extending portion 128 is connected to the first bending portion 124a extending beyond the first accommodating front 11 . Such a design can not only increase the heat dissipation area by using the first extending portion 128, but also improve the strength of the bending portion.

However, for the entire first flexible electrical connector 12 , its overall overcurrent capability depends on the independent overcurrent capability of each of the first connection block connection portion 122 , the first deformation portion, and the first electrode assembly connection portion 120 . If the overcurrent capability of any part is too low, the first flexible electrical connector 12 will be fused. Therefore, in this embodiment, in order to improve the overall overcurrent capability of the first flexible electrical connector 12, the first connecting block connecting portion 122 is further provided with a first connecting block auxiliary connecting portion 122a, and at the same time the first electrode assembly is connected to The part 120 is also provided with a first electrode assembly auxiliary connecting part 120a,

The first connecting block auxiliary connecting portion 122a can extend all the way to the side of the first extending portion 128, so as to increase the contact area between the first connecting block connecting portion 122 and the first connecting block 14. Similarly, the first electrode assembly auxiliary connection The portion 120a also extends to the side of the first extension portion 128 for increasing the contact area between the first electrode assembly connecting portion 120 and the first electrode assembly 10 . When the contact area is increased, the overcurrent capability can be enhanced.

In order to protect the first extension portion 128 , the first notch on the side of the first connection block 14 can accommodate the first bent portion 124 and the first extension portion 128 together.

Please continue to refer to FIGS. 26 to 29 , in this embodiment, the structure and function of the second limiting member 26 are similar to the first limiting member 16 , and may include a second limiting post 260 and a second limiting cap 262 , and relying on the second limit matching portion 244 (eg, the second limit hole) provided on the second connecting block 24 to cooperate to limit the displacement range of the second connecting block 24 . The second limiting member 26 may be fixed on the top cover sheet 30 like the first limiting member 16 , or may be fixed on the second upper insulating member 206 of the second electrode assembly 20 of various structures in the first embodiment. At the same time, the second electrode assembly 20 may also be integrally formed with the second upper insulating member 206 . In addition, the second flexible electrical connector 22 in this embodiment may also have a second extension portion 228 for heat dissipation, and the second electrode assembly auxiliary connection portion 220a and the second connection block auxiliary connection portion 222a can improve the second The overall overcurrent capability of the flexible electrical connector 22 and the arrangement of related structures are the same as those of the first flexible electrical connector 12 , which will not be repeated here.

Embodiment 3

The third embodiment of the present application carries out structural improvements on the basis of the second embodiment. In Embodiment 1 and Embodiment 2, both the first connecting block 14 and the second connecting block 24 can be displaced relative to the top cover sheet 30, but when connecting the first connecting block 14 and the second connecting block 24 with the bus bar When connecting, if both the first connecting block 14 and the second connecting block 24 can move freely, it will cause trouble in assembly.

In order to solve the above problems, as shown in FIGS. 30 to 32 , the top cover structure of the power battery provided in this embodiment includes a first elastic member 18 and a second elastic member 28 in addition to the structure of the second embodiment. The function of the first elastic member 18 and the second elastic member 28 is to elastically deform when the first connecting block 14 and the second connecting block 24 move relative to the top cover sheet 30 , and to rebound after the external force is removed, and to recover when the external force is removed. During the rebound, the first connecting block 14 and the second connecting block 24 are pushed back to the position before the movement, thereby ensuring that the first connecting block 14 and the second connecting block 24 can have a substantially fixed position for assembly.

Specifically, as shown in FIG. 30 , the first elastic member 18 includes a first radial elastic member 180 and a first axial elastic member 182. The first radial elastic member 180 is embedded in the first annular gap 164 and can A connecting block 14 is squeezed and deformed when it moves along the X-axis or the Y-axis under the action of an external force. In order to prevent the first radial elastic member 180 from escaping from the first limiting hole 144 from below, in this embodiment, the blocking portion 146 may be used to block the first radial elastic member 180 , that is, during assembly, the first radial elastic member 180 may be blocked. The radial elastic member 180 is disposed between the blocking portion 146 and the first limiting cap 162 . At this time, it is better to ensure that the upper surface of the first limiting cap 142 does not exceed the upper surface of the first connecting block 14 . The structure of the blocking portion 146 can be in the form of a limit block, preferably an annular baffle.

Continuing to refer to FIG. 30 , the first axial elastic member 182 is disposed below the first connecting block 14 , for example, disposed between the first connecting block 14 and the top cover sheet 30 , or disposed between the first connecting block 14 and the first electrode between components 10. When the first connecting block 14 moves downward along the Z-axis under the action of external force, the first axial elastic member 182 can be compressed, and after the external force is removed, the first connecting block 14 can be moved upward by the first axial elastic member 182 Jack up until it is limited by the first limiting cap 162 . At this time, the first connecting block 14 is restricted by the first limiting cap 162 and the first axial elastic member 182 in two opposite directions.

The first axial elastic member 182 can be arranged at any position below the first connecting block 14, as long as other components are avoided. However, considering space saving and ease of assembly, it is better to cover the first axial elastic member 182 It is arranged on the first limit post 160 . In addition, a first concave portion (not numbered in the figure) may also be provided on the top cover sheet 30 , the first electrical connection member 104 or the first upper insulating member 106 , and the bottom of the first limiting column 160 is fixed in the first concave portion. A second annular gap 166 is formed between the first recessed portion and the first recessed portion, and the first axial elastic member 182 is embedded in the second annular gap 166 to reduce the space occupied by the first axial elastic member 182 in the Z-axis direction. At the same time, the upper surface of the first axial elastic member 182 protrudes beyond the first concave portion, so as to contact with the first connecting block 14 and provide a force.

In this embodiment, as shown in FIG. 31 , the first limiting post 160 may include a lower fitting segment 160a and an upper fitting segment 160b, the diameter of the lower fitting segment 160a is larger than the diameter of the upper fitting segment 160b, and the first axial elastic member 182 is sleeved on the lower matching section 160a, and the first radial elastic member 180 is sleeved on the upper matching section 160b. The thicker lower fitting section 160a can improve the structural strength and connection strength of the first limiting column 160, while the movement of the first limiting block 14 along the X-axis and the Y-axis is mainly restricted by the upper fitting section 160b, so the smaller The upper matching section 160b is beneficial to improve the moving range of the first connecting block 14 .

The first radial elastic member 180 and the first axial elastic member 182 may take various forms, for example, a spring extending in the radial direction of the first limiting post 160 is provided around the first limiting post 160 to serve as the first radial The elastic member 180 is provided with a spring extending along the axial direction of the first limiting member 160 to serve as the first axial elastic member 182 . However, this method is difficult to assemble and has poor reliability. Therefore, in this embodiment, it is recommended that the first radial elastic member 180 and the first axial elastic member 182 adopt annular structures made of elastic materials.

Similarly, the structure and function of the second elastic member 28 in this embodiment are similar to those of the first elastic member 18, and may include a second radial elastic member 280 and a second axial elastic member 282, and according to the second limit The position of the position post 260 may be a second concave portion provided on the top cover sheet 30 or the second upper insulating member 206 , the bottom of the second limit post 260 is fixed in the second concave portion, and the second axial elastic member 282 Embedded between the second concave portion and the second limiting post 260 to reduce the space occupied by the second axial elastic member 282 in the Z-axis direction, and at the same time make the upper surface of the second axial elastic member 282 extend beyond the second concave portion , to contact with the second connecting block 24 and provide force. In addition, the second limiting column 260 may also adopt a two-section structure similar to the first limiting column 160 to achieve the same technical effect, which will not be repeated here.

The top cover structure of the power battery provided by the embodiment of the present application can make the first connecting block and the second connecting block relatively displace to absorb the force between them and the bus bar, and can also limit the first connecting block and the second connecting block. The displacement amplitude of , and can make the first connecting block and the second connecting block return to the initial position in the natural state.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Improvements, etc., should be included within the scope of protection of this application.

Claims (11)

1. a kind of top cover structure of power battery, which is characterized in that including coping plate, first electrode component, second electrode component, Two flexible electrical connections and the second link block,

The first electrode component is electrically connected with the coping plate, and the second electrode component and coping plate sealing and electricity are absolutely Edge,

Second link block is located at the top of the second electrode component, and second link block passes through second flexible electrical Connector is electrically connected with the second electrode component, and second flexible electrical connection has second electrode component interconnecting piece, Two variant part the second link block interconnecting pieces, the second electrode component interconnecting piece is electrically connected with the second electrode component, described Second link block interconnecting piece is electrically connected with second link block, and second variant part connects the second electrode component connection Portion and the second link block interconnecting piece,

Under the premise of keeping status of electrically connecting, second link block under external force can be relative to the second electrode Component is subjected to displacement, and the second link block interconnecting piece can be moved together with second link block, and described in pulling Deformation occurs for second variant part；

The second electrode component includes insulating part on the second pole, the second electrode column sealing part and second,

Second pole passes through the coping plate, and is connected by the second electrode column sealing part and the coping plate sealed insulation It connects, insulating part is between second link block and the coping plate on described second, the second electrode component interconnecting piece It is electrically connected with second pole.

2. top cover structure of power battery as described in claim 1, which is characterized in that include mutually hanging down in three-dimensional cartesian coordinate system The length direction of straight X-axis, Y-axis and Z axis, the coping plate is X-axis, and width direction is Y-axis, and thickness direction is Z axis,

Second variant part has at least one second bending part, and second bending part is in X/Y plane, YZ plane and XZ Bending structure is projected as in plane thrin.

3. top cover structure of power battery as claimed in claim 2, which is characterized in that second flexible electrical connection is sheet Structure, and the thickness side of the plane where the projection of second bending part and second bending part for forming the projection To parallel.

4. top cover structure of power battery as claimed in claim 3, which is characterized in that second variant part has the second connection Portion and two second bending parts,

One of them described second bending part is projected as bending structure in YZ plane, another described second bending part is in XZ It is projected as bending structure in plane, two second bending parts are connected by the second connecting portion.

5. such as the described in any item top cover structure of power battery of Claims 1-4, which is characterized in that second link block connects Socket part is electrically connected with the lower surface of second link block or upper surface.

6. top cover structure of power battery as claimed in claim 5, which is characterized in that have second to connect on second link block Hole or the second notch are connect, the second link block interconnecting piece passes through second connecting hole or the second notch is connect with described second The upper surface of block is electrically connected.

7. top cover structure of power battery as claimed in claim 5, which is characterized in that the upper surface of second link block has Second link slot, the second link block interconnecting piece are electrically connected with second link slot, the second link block interconnecting piece Upper surface is no more than the upper surface of second link block.

8. top cover structure of power battery as described in claim 3 or 4, which is characterized in that the second flexible electrical connection packet Containing several flexible connection pieces, several flexible connection pieces are cascading, and are at least mutually permanently connected in end positions.

9. a kind of power battery, which is characterized in that including the described in any item top cover structure of power battery of claim 1 to 8.

10. a kind of battery modules, which is characterized in that multiple including busbar connector and multiple power batteries as claimed in claim 9 It is electrically connected between second link block by the busbar connector.

11. battery modules as claimed in claim 10, which is characterized in that the busbar connector is straight panel structure, and described second connects The upper surface and the busbar connector for connecing block are fitted and connected.